Method of natural gas preparation for burning in boilers with multipurpose use of gas excessive pressure energy for generation of electric energy and chill, discharge of gas condensate, production of water condensate and system for method implementation

FIELD: heating.

SUBSTANCE: when natural gas is prepared for burning in boiler, temperature of natural gas at the outlet of expansion engine is provided by control of gas expansion extent so that it is below dew point temperature of heavy carbohydrate fractions - gas condensate. Gas is sent through separator for separation of gas condensate. At least part of natural gas without heavy fractions is sent through heat exchanger for cooling of natural gas burning products in boiler down to the temperature below dew point of water vapours, which are produced in process of natural gas burning, with preparation of water condensate. System for preparation of natural gas for supply to consumer contains at least one expansion engine and electric generator connected to its shaft, at least one gas separator, which is connected with its inlet to at least one outlet of gas from expansion engine, and also at least one gas heat exchanger, which is connected with its inlet to the outlet of at least one gas separator. Outlet of expansion engine is connected to the inlet of reservoir, volume of which is selected based on conditions of gas condensate discharge, and reservoir gas outlet is connected with inlet of gas separator. Outlets of reservoir and gas separator by liquid are connected with reservoir for collection of gas condensate, which is installed at the lower level, and outlet of separator by gas is connected to gas heat exchanger for cooling of burning products and with inlet of chill removal unit, which is connected to refrigerator, and outlets of gas heat exchanger and unit of chill removal by gas are connected to units of boiler gas collection units.

EFFECT: increase of chill use efficiency.

10 cl, 2 dwg

 

The technical field

The group of inventions relates to the field of engineering and is designed for natural gas applications in mass production of mechanical energy, cold through the use of differential pressure, mainly in the production system, gas-reduction (GDS) and pumping stations, in combination with means for producing thermal energy by burning natural gas.

The prior art.

Know the use of energy differential pressure gas flow at GDS for the simultaneous production of mechanical energy and cold, the transformation of mechanical energy into electrical energy and the use of cold for cold rooms and ice machine (see, for example, "Theoretical foundations of the use of energy-pressure natural gas, mineral resources, 1968, ed. Zaritsky HE; "energy-efficient replacement installation. The subsoil, 1999, ed. The Stepanets A.A.; W. "Gas industry" No. 10, 2003, No. 6, 2006, ed. Aksenov DT; RF patent №2264581, 2004).

The essence of the known techniques is that natural gas, high pressure, is directed into the expander, the gas expands and does external work, which is used to drive various machines such as a generator. Lowering the temperature of the gas, caused by its expansion, is used to cool down once the ranks environments using a heat exchanger, for example, air in the chambers of the refrigerator.

The design and parameters of expanders and energoholding units, most appropriate for the gas industry objects, sufficiently developed, manufactured and industrial tested their experimental batch (see, for example, the patent and article Aksenova DT logs "Gas industry" No. 10, 2003, No. 6, 2006, and others). Sufficiently developed and the use of cold arising from electricity generation by gas expansion in the expander (see, for example, the patents of the Russian Federation No. 2283462, 2006 and # 55928, 2006).

However, the implementation of this known technology using a specially designed specified in the above-mentioned articles of the power series electrocoloring aggregates arises the problem of entrainment in the system of heavy hydrocarbon fractions, if they exist in the composition of natural gas. On the one hand, this may lead to violation of the technology of gas supply due to congestion at certain points of the liquid gas condensate, on the other hand ash heavy hydrocarbon fractions.

When operating in thermal power plant boiler, there is the problem of improving the reliability and the efficiency of thermal power plants, heating systems, etc. This problem also can be solved using the cold. These objects are essentially depend on the quality of vodacek process agent. Maximum quality has water condensate. Receive by water evaporation and subsequent condensation of the vapor due to the applied heat is unacceptable due to the high cost. The existing complex and expensive water treatment system at TPP not fundamentally can ensure the quality of water corresponding to the water quality of the distillate. As a result, the heating surfaces of boilers, heat exchangers and other equipment are covered with scum and corrosivus elements of butt joints. Therefore, it is necessary to develop new technical solutions and to create a system using cold.

Closest to the proposed group of inventions under the patent of the Russian Federation No. 2264581, 2004, according to which method the preparation of natural gas to supply the consumer with a comprehensive energy use of natural gas is the expansion of the natural gas in at least one expander, the removal of the mechanical energy of each expander to drive an electric generator and the transmission ohladivshegosya in the expander gas before delivering it to the consumer via at least one heat exchanger of the refrigerator, and the transmission of cold gas through the heat exchangers cameras refrigerator carried out sequentially, and the remaining amount of cold gas is passed into the heat exchanger to the ice machine with the floor is rising at the output of the fridge and ice machine gas temperature, to ensure the normal use by the consumer. System to implement the method contains at least one energoholding unit (ECHO), each of which includes an expander and connected with the shaft of the generator, and a gas cooler, a heat exchanger which is connected to the output of at least one of the ECHO and which is connected to piping for supplying gas to the consumer, and the gas refrigerator contains a chamber with heat exchangers, which are connected to each other sequentially, and the output of the heat exchanger is connected to the pipeline gas supply to the consumer, and the system is equipped with at least one ice machine, heat exchanger, which is connected to the output of each of the specified ECHO and with pipeline gas supply to the consumer.

When implementing this technology are experiencing problems similar to the above.

The invention

Object of the invention is the creation of a complex technical solutions that provide the greatest efficiency technology energy utilization technology differential pressure natural gas ("waste" energy from a source of natural gas on objects. The method used in this technology, should be carried out using standard equipment for serial production, and the device used must b is to be improved and standardized elements of this equipment.

The technical result achieved by using the proposed method and system for its implementation, is to increase the efficiency of cold expansion of gas expanders, to obtain new useful effects while providing at the output of the system gas pressure and temperature required for its normal use by the consumer without any additional effects on him. This invention enables efficient use of energy differential pressure of gas in the use of cold for discharge from the gas heavy hydrocarbon fractions (liquid gas condensate) and the production of water condensate for boiler feed and use it as a coolant in the auxiliary systems of boilers and heating systems.

The most appropriate technology solution to the problem of allocation of gas condensate directly on the object can be considered the implementation of this process in two steps: first, enter cold gas after expansion in capacity, in which sharply reduced the speed of its movement, and for a residence time of gas in this tank of gas condensate is released and settles in the form of liquid fraction (electrocoloring Assembly by patent No. 2264581, 2004 this capacity is the chamber in which are located the turbine is the generator); the second stage cold gas is injected into a conventional separator (e.g., cyclone), where it is divided to the main part of the gas condensate in the form of a liquid fraction and is given to the team capacity.

Thus, to solve this problem it is required to develop appropriate technical solutions defining the parameters necessary for the implementation of the allocation process gas condensate, and to create the appropriate system. The technical result achieved by using the proposed system for the allocation of gas condensate, is: first, the possibility of implementing this process directly on the object using its own cold (this is usually done in areas of gas production), and secondly, to simplify the design and reduce the cost of building and operating such a system.

The problem of obtaining water condensate in large quantities on the TPP is also possible to solve it using cold expansion of natural gas in the expander. The bottom line is that TES has a gas-reducing station (GDS), which reduces the pressure of the gas before feeding it into the boiler. When installing the expanders in the gas system GDS provides electricity and cold. Part of this cold or completely may send the system for the production of the same condensate, i.e. for cooling the combustion products of natural gas in boilers to condensing of them "molecular water formed as a result of chemical reactions of hydrocarbons with oxygen from the air. For example, the combustion of methane and other:

CH4+2O2-----CO2+2H2O; C2H6+3O2-----2CO2+3H2O, etc.

The combustion of one kilogram of methane in the combustion products formed more than two kilograms of water. To condense from the stream of products of combustion, apparently, difficult, 65-75% is realistic. These experiments are conducted and positive results were obtained (see, for example, the issue of "improving the efficiency of compressor stations of main gas pipelines", Moscow, Negatron, 1974, ed. Samylov V., Aksenov DT and others, as well as the Reduction of material and energy intensity in the gas industry". Nedra, 1992, ed. Aksenov DT).

The technical result is achieved in that in the method of preparing the natural gas to supply its consumers with energy use of natural gas by expanding it in at least one expander, using the generated mechanical energy to drive an electric generator and transmission coming out of the expander ohladivshegosya when expanding in the expander gas before delivering it to the consumer via at least one with whom parator gas and through, at least one heat exchanger according to the invention, in the preparation of natural gas combustion in boiler regulation of the degree of expansion of the gas in the expander ensure the temperature of natural gas at the exit of the expander temperature below the "dew point" of heavy hydrocarbon fractions of gas condensate, carry out the transmission of gas through the separator for the separation of gas condensate, carry out the transmission of at least part of the natural gas without heavy fractions through the heat exchanger for cooling the combustion products of natural gas in the boiler to a temperature below the temperature of dew point of water vapor generated by the combustion of natural gas, with the receiving water condensate.

In addition, through the coil skip part of natural gas without the heavy fractions, and the remainder is used for cooling the air in the chambers of the refrigerator.

When the allocation of gas condensate before passing the gas through the separator serves enlarged and ohladivshegosya in the expander natural gas into the tank, where its speed is sharply reduced and partially condense the heavy hydrocarbon fraction.

In addition, when the receiving water condensate before passing through the heat exchanger and the combustion products of natural gas is cooled the surrounding air is m in the air cooler.

Receiving water of condensation products of combustion withdrawn from the chimney and the air after cooling the combustion products and cooling circuit within the heat exchanger return the products of combustion in the flue force. And the resulting water of condensation accumulating in the tank having a venting tube to remove the released carbon dioxide before applying water condensate in the boiler and heating system using a pump.

The technical result is also achieved by the fact that in the system for the preparation of natural gas to supply the consumer with energy use natural gas containing at least one expander and connected with the shaft of the generator, at least one gas separator, which is connected to an input with at least one gas outlet of the expander, and at least one gas heat exchanger connected by its input to an output, at least one gas separator according to the invention, in the preparation of natural gas combustion in boiler output expander connected with the input capacitance, the amount of which are selected on the terms of the allocation of gas condensate, and the output capacity of the gas connected to the inlet of the gas separator, and outputs the capacitance and gas separator for liquid connected to the tank for collection of gas condensate, which the traveler is located on the lower level and the output of the separator gas is connected with a gas heat exchanger for cooling the products of combustion and to the input of block selection cold connected with the refrigerator and the gas exits the heat exchanger and the unit selection of cold gas are connected with the blocks receiving gas boiler.

In addition, it is equipped with at least one air cooler products of combustion, which its input is connected to the chimney of the boiler, and the exit - gas heat exchanger, the output of which the products of combustion connected through the fan to the chimney.

In addition, in a flue of the boiler is installed elbow, the entrance of which is directed against the movement of products of combustion, and to the output of the angular pipe connected to the pipe connecting the pipe with the air cooler, and at the end of the pipeline that connects the fan to the chimney, installed elbow, the output of which is directed in the direction of travel of the combustion products in the flue.

The system can be equipped with a system to automatically maintain the temperature of the combustion products in the gas heat exchanger within the specified limits by the impact of the actuators to position the opening shut-off and regulating bodies that are installed on the pipeline connecting the gas heat exchanger with flue, and TRU is oprovide supplying cold gas to the gas refrigerator.

To implement this proposal should develop technical solutions, to determine the basic performance parameters, and then the production system of water condensate. The technical result is achieved by the fact that a fundamentally new effective system of obtaining water condensate to maintain a constant temperature regardless of the temperature of the combustion gas passing through the flue, temperature fluctuations of natural gas entering the system after the expander by including in the return line of the combustion products in the flue pipe of a device that regulates the amount of incoming combustion gas from a flue pulse sensor water temperature of the condensate when the deviation from the setpoint. The technical result is also achieved by the fact that the products of combustion of natural gas is cooled successively in two stages: in the first stage using a traditional air cooler (DAC)connected to its input from the chimney, in which heat is dissipated into the environment; in the second stage - the heat from the products of combustion is given by the connected with AVO gas heat exchanger, through which the other cavity miss the cold natural gas after expansion and cooling the combustion gas to tempera is URS temperature below the "dew point" of water vapor. The technical result is also achieved by the fact that the products of combustion from the smoke pipes are inserted in the outlet pipeline through the elbow, placed in a flue, the entrance of which is directed against the movement of products of combustion, and the discharged products of combustion from the system in the flue pipe on the pipeline, which sequentially includes: fan with electric shut-off and regulating body (controlled by the pulse from the temperature sensor condensate) and elbow, placed in a flue, the output of which is directed on the movement of products of combustion. The technical result is achieved in that in the method of preparation of natural gas combustion in boilers carry out its expansion in at least one expander electrocoloring unit (ECHO) with removal of mechanical energy from each expander to drive an electric generator of the corresponding ECHO, then skip emerging from the ECHO ohladivshegosya in the expander gas before serving in units of the boiler through, according to the invention, at least one gas separator and then through at least one gas heat exchanger in the system receive water of condensation, and also through at least one heat exchanger, where natural gas is cooled intermediate coolant for refrigerators. Also, technically the result is achieved also by the fact, the combustion products of natural gas in the boiler unit at the first stage is passed through at least one air cooler, and then through at least one gas heat exchanger.

Thus, in the method of preparation of natural gas combustion in boilers, comprehensive energy use of natural gas is carried out by passing it through attached to the pipeline of a high pressure expander, in which the natural gas is expanded to lower pressure and temperature and removal of mechanical energy, for example, to drive an electric generator, and then, according to the invention, the resulting cold, i.e. the cold natural gas, is directed into the separator gas (e.g., cyclone), where the gas temperature is below the "dew point" of heavy hydrocarbons from natural gas is condensed and emitted gas condensate. The outlet from the separator gas condensate from the vessel (body) electrocoloring Assembly, connect with the team capacity. Then part of the cold gas after the separator is passed through a gas cooler, which is cooled pre-cooled in the air cooler (AVO) the combustion products of natural gas, and another part of the cold gas is passed through the unit selection from cold gas, which is cooled intermediate refrigerant, with the aid of the through which cool air in the chambers of the refrigerator. The gas outlets of the gas heat exchanger and from the unit of selection in natural gas cold unite in one pipeline and bring it to a specified temperature and pressure to the blocks of his reception by the boiler. The specified pressure and temperature of natural gas, which is led to the boiler, ensure, through the automatic control system, which by means of appropriate sensors and control devices affects the volume and flow characteristics of the combustion products, natural gas and flow intermediate coolant.

Thus, it is shown that the features which characterized the invention are significant and are aimed at solving common tasks - the most efficient and comprehensive energy use technologically necessary differential pressure source of natural gas, i.e. the "junk" energy gas stream, which is currently in large quantities dissipeared is reduced, the gas pressure in distribution systems.

A brief description of the drawings.

The group of inventions is illustrated by drawings, where figure 1 shows the block diagram of the proposed system energoholding complex, showing the relationship of its components between gas-reduction point (GRP) or gas-reducing station (GDS) and consumers of natural gas the water condensate. Figure 2 shows a system for the preparation of natural gas combustion in boilers, and the allocation of water condensate, functional diagram.

As can be seen from figure 1, this complex includes: power unit 100 of electrocoloring units; unit 101 of the gas separation and collection of gas condensate; block 102 production of water condensate; block 103 selection of cold natural gas when used for the operation of the refrigerator. All these parts are interconnected gas pipelines 106 between themselves and with gas fracturing 112 (dashed line). Unit 101 is connected with the gas pipeline and pipeline (solid line with crosses) 109 is associated with the capacity of the collection of gas condensate. Block 102 with one hand tied (dash dotted line) 107 pipes (inlet and outlet) with the chimney. On the other (solid lines) 108 pipeline is connected with the boiler 113. Block 103 on the one hand is connected with the pipeline, the pipeline 110 (solid lines, crossed by oblique strokes) with a fridge 104. Block 105 software automatic control system SAU bound (dotted line) with blocks 102, 103 and the sensor 111.

Each object constituting energoholding complex, produces a positive effect:

- unit 100 - electricity and cold;

block 101 separation of gas - liquid gas condensate;

block 102 production mol the molecular water - water condensate;

block 103 selection in cold gas - cooled intermediate coolant.

From source natural gas high pressure, after cleaning, enters the turboexpander electrocoloring unit in the nozzle apparatus which potential energy pressure gas is partially converted into kinetic energy with decreasing gas temperature. Streams of gas with high velocity impinges on the rotor blades of the expander, causing it to rotate, which, in turn, makes working with external objects, for example, actuates a generator. The temperature difference at inlet and outlet of the expander is determined by the degree of expansion of gas in it. Next in the chamber (capacity building) electrocoloring unit at the exit of gas from the expander sharply (in order) decreases the speed of its movement to and from partially condense the heavy hydrocarbon fraction is a gas condensate. This occurs if the gas temperature is below the temperature of the "dew point" of these fractions. The cold natural gas from the housing electrocoloring unit is introduced into at least one separator gas (for example, cyclone type), in which there is almost complete condensation of heavy hydrocarbons. Raw gas condensate from the housing electrocoloring unit and the C separator gas pipeline drains into the condensate traditional design. After the final processing of gas condensate used as motor fuel.

After the separator gas stream of cold natural gas released from the condensate, i.e. almost pure methane, is divided into two streams. One part of the gas flow passes through at least one gas heat exchanger, which cools the products of combustion in boiler natural gas, the other part of the gas flow passes through at least one block selection in gas cold to use it when the fridge. At the gas outlet of the gas heat exchanger and from the block selection cold gas streams are combined, and a single stream is sent in blocks of natural gas boilers. And after mixing of the gas streams is controlled by its temperature. It should not go beyond the prescribed limits. It is provided with an automatic regulation of the temperature and volume of the separated gas streams.

Production of aqueous condensate by cooling part of the products of combustion of natural gas in the boilers as follows: first, at least one air cooler (AVO) and subsequent cooling circuit of the combustion products to a temperature below the "dew point" of water vapor in the gas heat exchanger through which cold natural gas settlement is e expander and gas separator. Water condensate from the gas enters the heat exchanger team capacity. From team capacity he gets the pump and through the filter is fed into the system TES.

System, realizarea the way, is a unit of electrocoloring units (PAGE)associated with the complex process units. Functional diagram of this system is shown in figure 2. The unit its inlet collector 1 is connected to a source of high pressure gas through the supply pipe containing sequentially placed a stop valve 2 and the filter 3. To the collector 1 pipelines containing controlled stop valves 4, which have their outputs connected to electrocoloring units 5, and the outputs of these units piping connected to the collector of the low-pressure gas 6, which is connected by a pipe containing a shut-off element 7, with the gas separation unit 8. The output of the separator 8 is connected to gas pipelines containing controlled shut-off and control elements 9 and 10, together with the block selection cold the strip 11 and the gas heat exchanger 12, and the outputs of the blocks 11 and 12 are connected to a common gas units gas receiving 30 boilers. When the stop unit gas to the blocks 30 may be supplied by an existing pipeline, which connects them with the existing GDS (SRC).

The outputs of the gas condense the and of the lowest points of buildings electrocoloring units 5 and from the gas separation unit 8 pipelines are joined into a single pipeline, which is connected to the input of team capacity 13. From the tank 13 raw gas condensate pipeline containing the pump 14, is given for final processing. The unit selection cold 11 pipeline containing the pump 15 is connected to the heat exchangers of the refrigerator 16. By educated this way the closed loop circulating intermediate coolant.

The power receiving water condensate includes AVO 17, which pipes containing the locking elements 18, controlled shut-off and control element 19, the fan 20 and the block 21, Doklady combustion products. This unit has gas cooler 12 and the condensate, which comprises a sensor 22 associated with the block 23 SAU. In turn, the block 23 is connected simultaneously with shut-off and control elements 9, 10, 19. The output of block 21 piping is connected to the input capacitance of the drive condensate 24, equipped with a draining pipe ("candles") 25, and the output of memory 24 a pipeline containing a pump 26 and a filter 27 is connected to the blocks 28 receiving condensate boilers and systems.

Thus, before entering the consumer (boiler) natural gas high pressure, except for the transfer of mechanical energy to an external device, is used as the coolant, providing the allocation of gas condensate receiving water condens the TA and the cooling intermediate coolant or air in the chambers of the refrigerator. In the pipeline, leading the gas to the boiler, he comes under reduced pressure and temperature, which are allowed by the operating conditions of the equipment.

The proposed system is energoholding complex works as follows.

The high-pressure gas when you open the locking element 2, having existing filters 38 and cleaning filter 3, is fed into the input manifold gas 1 unit. From collector 1 gas through controlled stop valves 4, enters the block of reception and distribution of gas electrocoloring units 5. In the expander unit 5 potential energy of the pressure of the gas is partially converted into kinetic energy, resulting in a rotation of the rotor of the expander and connected with its shaft coupling the rotor of the generator (figure 2 - not shown, see patent No. 2264581, 2004). This reduces to the values specified pressure and temperature of the gas at the exit of the expander.

If the incoming natural gas contains heavy hydrocarbon fractions, they partially condense if the temperature of the gas below the temperature of their "dew point". For the effectiveness of primary condensation of these fractions is provided by the decrease in the rate of gas movement due to a sharp increase in the cross-section area of the gas in the chamber (casing) electrocoloring unit, in which the gas ejects the I of the expander. Released gas condensate accumulates in the cells of plants, and from them he pipeline 29 merges into a team capacity 13. Next, the cold gas enters the manifold low pressure 6, and into the gas separator 8, which is completely separated from the incoming gas heavy hydrocarbon fraction. From the separator gas condensate enters the tank 13, and out through the pipeline with a pump raw gas condensate is directed to the final final processing.

The flow of gas released from gas condensate, after the separator 8 is passed to the block 11 selection from cold gas, where it is heated to a temperature at which it can be served in units of the receiving strip 30 of the boiler. In block 11 gas heat is transferred from the intermediate coolant, which by means of pump 15 circulates through a closed circuit between this unit and the heat exchangers of the refrigerator 16.

Simultaneously with the gas flow into the block 11 selection of cold another part of the gas flow is directed into the gas heat exchanger 12 where it is heated by heat from the combustion products of natural gas coming out of the boiler. At this pressure and temperature of the gas at the outlet of the heat exchanger 12 is supported within the specified limits, to ensure the normal operation of the boiler. The gas streams at the output of block 11 selection of cold and the gas heat exchanger 12 are combined into a single pipeline, which brings him to the blocks receiving gas 13 boiler.

When the operation unit 101 of the locking element 31 remains open as element 2. When the gas passes through the entire system, as described above, and may partially flow through the existing hydraulic fracturing. This is supported with precision gas pressure in the unit receiving boilers. In the case of stop electrocoloring units 5 by overlapping all or part of the stop-valves 4 through hydraulic fracturing 113 will be an increased flow of gas. The complex should be equipped with ACS, which should automatically set the number of "worker threads" depending on the number included in the work electrocoloring units 5. In addition, maintaining a predetermined gas pressure in the reservoir 6 when the number of units 5, included in the work is accomplished through bypass part of the gas through the control valve 36, the pressure feedback.

Obtaining distillate by condensation of vapour molecule of water formed by the combustion of natural gas, is carried out by cooling to a temperature below the "dew point" of water vapor.

Due to the fact that the products of combustion of the gas escaping through the chimney of the boiler, have high temperature (up to 150°C), cooling is carried out in two stages: first stage - products of the combustion gas is cooled neighborhood is the missing air to a temperature (70-90° C) an air cooler the air cooler 17, and then, i.e. at the second stage combustion products gas googledocs in block 21 in which is located a gas heat exchanger 12. The combustion products are cooled to a temperature below the "dew point" of water vapor. Condensed molecular water is collected in the lower part of the block 21, having a water seal, and then through a pipeline that goes into the drive condensate 24. The condensate is slightly acidified with carbon dioxide pH=4,7÷5,5. In the drive 24, the carbon dioxide will stand out from the condensate and is discharged through the pipe ("candle") 25. From the drive 24 condensate pump 26 through the filter 27 are supplied to the blocks 28 of his reception by the boilers and systems TPP.

The combustion products of natural gas discharged from the flue pipe 37 through the elbow 32, the input of which is directed against their movement, and pipeline shut-off element 18 is supplied to the air cooler. After cooling in the air cooler products of combustion enter the block 21, in which they finally googledocs, transferring part of the heat to the cold natural gas passing through the gas heat exchanger 12, and then by means of the fan 20 on the pipe with shut-off and control element 19, is returned through the pipe 37. Pipe exhaust combustion products in the flue 37 ends angled pipe 33, the output of which direction the flax in the direction of travel of the combustion products in the flue. Having thus established angular nozzles facilitates the movement of products of combustion through the air cooler.

In the lower part of the block 21, where it accumulates water condensate has a temperature sensor 22, which is associated with the software block 23 SAU. Pulse of the sensor unit 23 generates impulses that act on actuators, valves and elements 9, 10, 19. When they change the distribution of the flow of gas between the block 21 and block 11 selection of cold at which the temperature of the condensate is maintained within the specified limits. In the lower part of the block 21 to maintain a minimum level of condensate due to the overlap of its release valve float device 34 (hydraulic lock). This level of condensate required for operation of the sensor 22 and the exit of products of combustion from the block 21.

In tank 13 and 24 installed the float device 35, which provide pulses in the block 23 SAU by closing/opening when it reaches the minimum/maximum liquid levels in said tanks. Questions of the mode of operation of the refrigerator are not considered, as they are described in detail in the patents: No. 2264581 and # 55928.

Material given above gives grounds to conclude that the proposed technical solution in the amount of two inventions (method and system for its implementation) allows pre is delete a number of problems, standing in the way of the successful application of technology to enhance the efficiency of natural gas through a comprehensive energy use technological differences of pressure between sources and consumers.

Industrial applicability.

The present invention can be applied in the means simultaneous generation of electricity, production of gas condensate and water condensate due to the pressure differential of natural gas, before her, in distribution systems, power plants, and facilities of the gas production.

1. The method of preparation of natural gas to supply its consumers with energy use of natural gas by expanding it in at least one expander, using the generated mechanical energy to drive an electric generator and transmission coming out of the expander ohladivshegosya when expanding in the expander gas before delivering it to the consumer via at least one gas separator and through at least one heat exchanger, characterized in that in the preparation of natural gas combustion in boiler regulation of the degree of expansion of the gas in the expander ensure the temperature of natural gas at the exit of the expander below the dew point temperature of the heavy hydrocarbon fractions - gas condensate, carry out the transmission of gas through the separator the La allocation of gas condensate, carry out the transmission of at least part of the natural gas without heavy fractions through the heat exchanger for cooling the combustion products of natural gas in the boiler to a temperature below the dew point temperature of water vapor generated by the combustion of natural gas, with the receiving water of condensation.

2. The method according to claim 1, characterized in that through the coil skip part of natural gas without the heavy fractions, and the remainder is used for cooling the air in the chambers of the refrigerator.

3. The method according to claim 1, characterized in that the allocation of gas condensate before passing the gas through the separator serves enlarged and ohladivshegosya in the expander natural gas in a container, providing a sharp reduction in the speed of motion of the gas and the partial condensation of heavy hydrocarbon fractions.

4. The method according to claim 1, characterized in that when receiving water condensate before passing through the heat exchanger and the combustion products of natural gas is cooled by the surrounding air in the air cooler.

5. The method according to claim 4, characterized in that for receiving the water of condensation products of combustion withdrawn from the chimney and the air after cooling the combustion products and cooling circuit within the heat exchanger return the products of combustion in the flue force.

6. The way pop, characterized in that the water condensate to accumulate in the tank having a venting tube to remove the released carbon dioxide before applying water condensate in the boiler and heating system using a pump.

7. System for the preparation of natural gas to supply the consumer with energy use natural gas containing at least one expander and connected with the shaft of the generator, at least one gas separator, which is connected to an input with at least one gas outlet of the expander, and at least one gas heat exchanger connected by its input to an output, at least one gas separator, characterized in that in the preparation of natural gas combustion in boiler output expander is connected to the input capacitance, the amount of which pick up terms and conditions of allocation of gas condensate, and the output capacity of the gas connected to the inlet of the gas separator, and outputs the capacitance and gas separator for liquid connected to the tank for collection of gas condensate, which is located on the lower level, and the output of the separator gas is connected with a gas heat exchanger for cooling the products of combustion and to the input of block selection cold connected with the refrigerator and the gas exits the heat exchanger and the unit selection of cold gas is connected to b is an OK reception of gas boilers.

8. The system according to claim 7, characterized in that it is provided at least one air cooler products of combustion, which its input is connected to the chimney of the boiler, and the exit - gas heat exchanger, the output of which the products of combustion connected through the fan to the chimney.

9. The system of claim 8, characterized in that a flue of the boiler is installed elbow, the entrance of which is directed against the movement of products of combustion, and to the output of the angular pipe connected to the pipe connecting the pipe with the air cooler, and at the end of the pipeline that connects the fan to the chimney, installed elbow, the output of which is directed in the direction of travel of the combustion products in the flue.

10. The system according to claim 7, characterized in that it is equipped with a system to automatically maintain the temperature of the combustion products in the gas heat exchanger within the specified limits by the impact of the actuators to position the opening of the shut-off regulators installed on the pipeline connecting the gas heat exchanger, flue pipe, and the pipe for supplying cold gas to the gas refrigerator.



 

Same patents:

FIELD: heating, ventilation.

SUBSTANCE: invention refers to the device and method to be used with air conditioning cycle. A turbine for power generation includes a rotor, a chamber and at least one nozzle for supply of a fluid medium to activate the rotor. Flow of the fluid medium out of the nozzle output is periodically interrupted with at least one device of the flow brake to increase fluid medium pressure inside the nozzle. In a thermo dynamic cycle two such turbines can be used; at that the first turbine is located after a compressor and before a heat exchanger, and the second turbine is located after an evaporator and before the compressor. The invention facilitates upgrading of a total efficiency owing to recuperation of a portion of energy.

EFFECT: upgraded efficiency of an air conditioning device.

31 cl, 14 dwg

FIELD: heating; engines and pumps.

SUBSTANCE: heat pump installation consists of an evaporator, made in form of a closed container. The evaporator is equipped with connection pipes for input and output of water. The heat pump also consists of a compressor with an actuator, linked to the steam channels of the evaporator, as well as a condenser in form of a closed container, equipped with outlet connection pipes, and linked to the compressor. The input of the compressor is directly put into the steam channel of the evaporator, while its output is put into the cavity of the condenser. The case of the compressor is sealed to the walls of the evaporator and condenser or to the common wall for the evaporator and condenser. In the evaporator, the steam channel is separated from the rest of the volume of the evaporator by a louvered water separator, sealed to the case of the compressor or evaporator container. The actuator of the compressor used is in form of a steam turbine, placed in the cavity of the condenser and equipped with steam input and output channels. The input of the steam turbine is linked to the output compressor stage. The steam output channel of the steam turbine is put inside the channel for supplying steam to the turbine. The case of the compressor at its output is in form of a diffuser.

EFFECT: increased efficiency of the installation and increased heat conversion coefficient.

6 cl, 1 dwg

Gas turbine device // 2304725

FIELD: gas turbine engineering.

SUBSTANCE: device comprises air compressor provided with the air cooler whose refrigerator is connected to the circulation circuit of coolant that is cooled by the absorption cooling machine connected with the combustion chambers and gas turbine provided with gas duct having the built-in heated member. The heated member is made of a heat exchanger provided with the intermediate heat-transfer agent. The heated section of the heat exchanger is set into the gas duct in the flow of exhaust gas in the zone where the temperature is lower than 150°C with the boiling temperature of the intermediate heat-transfer agent being no less than 130°C. The cooled section of the heat exchanger is mounted inside the boiler. The coolant is made of salt solutions, or Freons.

EFFECT: enhanced efficiency.

FIELD: transport engineering.

SUBSTANCE: invention relates to low-capacity turbocompressors-gas-expansion machines for transfer of hot contaminated gas-air mixture and for cooling air in vehicle air conditioning and air cooling system. proposed turbocompressor-gas-expansion machine has housing accommodating shaft installed inside housing on antifriction bearings with fitted on wheels of compressor and turbine-gas-expansion machine secured on ends of shaft. Bearings are grease packed. Bearing unit from side of compressor is installed with clearance relative to housing. clearance is divided by partition made of heat-insulating material into two spaces. Space from side of bearing unit communicates with atmosphere and with outlet of turbine-gas-expansion machine for cooling bearing by part of cooled air flow. Space from side of compressor is sealed to play part of heat shield.

EFFECT: simplified design, reduced overall dimensions of turbocompressor-gas-expansion machine, provision of normal temperature conditions for operation of bearing.

3 cl, 1 dwg

FIELD: power engineering, possible use in devices for using cold of natural gas at outlet of cryogenic gas expansion machine for ecologically safe cooling of air in chambers of refrigerator.

SUBSTANCE: method for utilization of cold, generated during expansion of natural gas in at least one cryogenic gas expansion machine with diversion of mechanical energy includes letting cold gas prior to feeding to consumer through at least one heat exchanger with cooling in this heat exchanger of intermediate fire and explosion safe liquid coolant. Heat exchanger is made with direct contact of substances. Cooling of air in cooling chamber is performed by letting cold liquid coolant through heat exchanger of refrigerator, which is returned to heat exchanger for cooling by natural gas. Draining of liquid coolant is compensated by natural gas by means of feeding liquid coolant into its circulation contour when level of liquid coolant decreases in heat exchanger. System for utilization of cold, generated during expansion of natural gas with diversion of mechanical energy contains at least one cryogenic gas expansion machine with device for receipt of mechanical energy, connected to source of high pressure natural gas, heat exchanger for cooling of liquid coolant, at least one chamber of refrigerator with heat exchanger and accumulating vessel for liquid coolant with device for controlling level of liquid coolant, connected to pipeline, connecting outlet for liquid coolant of heat exchanger for cooling of liquid coolant to at least one heat exchanger of refrigerator chamber. Vessel is made with possible connection to liquid coolant storage and through valve for discharging gas - to atmosphere when a signal is received by valve from device for controlling level of liquid coolant.

EFFECT: improved efficiency, increased ecological safety and explosion safety of cold utilization.

2 cl, 3 dwg

FIELD: refrigeration equipment, particularly used to utilize secondary energy and natural source energy having low potential, namely for combined heat and cold production.

SUBSTANCE: refrigeration plant comprises body, turbine, compressor, supply pump, evaporative and condensation chambers and capillary system for working liquid throttling. The body is separated into power and cooling sections by solid partition. Evaporative, working and condensation chambers are created in the power section. Inside surfaces of side evaporative chamber walls and partition are covered with wick. Inner surface of end wall is provided with grooves and covered with thin porous material layer. Shaft extends through body walls, power and cooling sections, solid partition and wick layers. Feed pump rotor is put on shaft end so that the pump is communicated with working liquid reservoir. Arranged in cooling sections are low-temperature evaporative chamber and compressive condensation chamber communicated by compressor to which vapor flow is fed. Compressor rotor is put on shaft.

EFFECT: increased performance.

1 dwg

FIELD: power engineering; power generating installations.

SUBSTANCE: the invention is pertaining to the field of power engineering, in particular, to the power generating installations utilizing the energy of the overpressure of the rock gas with realization of the gas-turbine-expansion effect. The gas-turbine-expansion installation for utilization of the compressed rock gas energy contains in series mounted on the high-pressure rock gas mains: the electric heater for preheating of the gas; the turbo-expander kinematically linked with the electric power generator; the power storage battery with a capability of its recharge from the electric generator at the turbo-expander operation in the recharge mode and at connection to the heater in the initial moment of the installation operation with the subsequent switching-off from the heater at the turbo-expander reaching its operational mode. The electrical heater is the resistive heater and connected to the electric power generator through the control unit, which is electrically connected to the temperature sensing devices mounted on the inlet and the outlet of the turbo-expander. Utilization of the invention ensures simplification of the design chart of the power gas-turbine-expansion installation and the capability to regulate the preset temperatures of the gas at the inlet and the outlet of the turbo-expander.

EFFECT: the invention ensures simplification of the design chart of the power gas-turbine-expansion installation and the capability to regulate the preset temperatures of the gas at the inlet and the outlet of the turbo-expander.

2 cl, 2 dwg

FIELD: pipeline systems for gas distribution, particularly with the use of excessive gas pressure reduced in gas-distribution stations and adapted to obtain electric energy, cold and ice without fuel combustion.

SUBSTANCE: method involves using gas cooled by expanding thereof in expander without external work performing as cooling agent to cool air in refrigerator compartments and in ice generator. Part of cold gas passes in ice generator heat-exchanger connected to energy-cooling plant outlet or to collector linked with outlet of each energy-cooling plant to obtain consumer-demanded gas temperature at ice generator outlet. System for above method implementation includes gas refrigerator with compartments and heat-exchangers arranged in each compartment. The heat-exchangers are connected one to another in series. Outlet of above heat-exchangers is connected to pipeline which conveys gas to consumer. The system is provided with at least one ice generator having heat-exchanger linked to outlet of corresponding energy-cooling plant or with collector connected to outlet of each energy-cooling plant and with pipeline adapted to convey gas to consumer. Energy-cooling plant has turboexpander and electric generator, energy drive with impeller machine, gas refrigerator and ice generator used in the system.

EFFECT: increased efficiency of gas cold usage and environmental safety.

31 cl, 5 dwg

Cooling turbine // 2263858

FIELD: cooling and heating equipment; devices used for cooling and heating atmospheric air fed to domestic or industrial rooms.

SUBSTANCE: proposed cooling turbine includes casing, centrifugal multi-stage compressor, multi-stage peripheral-admission turbine whose blades are located between cover shields provided with circular projections over periphery and cover disks. Centrifugal compressor is provided with straightening apparatus at its inlet which has spiral blades with intake holes over periphery of rotor. Multi-stage peripheral-admission turbine is provided with outlet apparatus at its inlet which has spiral blades with outlet holes over periphery of rotor; rotor is mounted on revolving shaft. Working blades are secured on cover shields of rotor. Located in initial row of immovable disks as far as middle one are immovable straightening apparatus with spiral blades of diffuser which are located on fixed axle inside rotor. Located in subsequent row of immovable disks, after middle one, are immovable nozzle sets provided with spiral blades of contraction and secured on fixed axle inside rotor. Middle dividing disk is non-rotating and is rigidly secured on the same axle inside rotor. Rotating blades located on opposite sides of dividing disk are also secured on cover shields of rotor. Fixed axle has hole for passage of additional cooler or heater. On side of drive unit, end tenon of rotor is located between two bearings.

EFFECT: enhanced efficiency under any climatic conditions.

4 dwg

FIELD: cooling equipment, particularly refrigerators including turbo-expanders operating within wide range of cooling temperatures.

SUBSTANCE: turborefrigeration plant comprises turbo-expander, multi-compartment dynamic heat-exchanger, user of refrigeration, power source and centrifugal turbocompressor. Centrifugal turbocompressor is divided into low-pressure and high-pressure centrifugal stages. Low-pressure stage is mechanically linked with power source. High-pressure stage is mechanically connected to turboexpander. The first heat-exchanger compartment inlet communicates with outlet of user of refrigeration through channel, outlet thereof communicates with atmosphere. The second heat-exchanger compartment inlet is connected to low-pressure turbocompressor stage outlet and outlet thereof is linked with high-pressure turbocompressor stage inlet. The third heat-exchanger compartment inlet is connected to high-pressure turbocompressor stage outlet, outlet thereof is linked with turbo-expander inlet.

EFFECT: increased refrigeration performance, increased reliability of plant actuation and operation, simplified structure, increased operational economy.

2 dwg

FIELD: refrigerating engineering.

SUBSTANCE: proposed method includes setting the turbine outlet temperature and continuous measurement of pressure and temperature after air bleed stages of engine compressor. Air temperature and pressure at turbine inlet, temperature and pressure at turbine outlet and rotational speed of rotor are calculated by means of system modulating unit. Then, degree of reduction of pressure in turbine, present magnitude of corrected rotational speed of rotor and optimal magnitude of corrected rotational of rotor corresponding to maximum efficiency of turbine are determined. Braking torque of rotor is changed by acting on braking unit till optimal and present magnitudes of rotational speed of rotor get equal. In case rated magnitude of air temperature at turbine outlet exceeds preset magnitude, flow rate of purging air is decreased or increased till magnitudes get equal. When these temperatures are equal, consumption of fuel is determined for each bleed stage and is analyzed for obtaining minimum consumption of fuel. Then, air temperature and pressure at turbine inlet, temperature and pressure at turbine outlet and rotational speed of rotor are determined by means of sensors. According to results thus, obtained, above-mentioned parameters are determined and processes are repeated till optimal and present magnitudes of corrected rotational speed of turbine rotor and preset and measured magnitudes of air temperature at turbine outlet get equal after which actual consumption of fuel is determined.

EFFECT: reduced consumption of fuel.

6 cl, 1 dwg

FIELD: wave expander-compressors, possibly used in compression systems and plants with expansion machines.

SUBSTANCE: expander-compressor includes housing in which rotor is mounted on shaft. Rotor has energy-exchange ducts communicated at rotor rotation with branch pipes for supplying and discharging gas through gas supply nozzles and diffusers for discharging gas in respective gas distributing devices. Housing is in the form of stator having electric winding. Rotor having energy-exchange ducts is provided with short-circuit winding whose rods are arranged between outer surface of rotor and its energy-exchange ducts.

EFFECT: simplified design of wave type expander-compressor.

2 dwg

FIELD: device adapted to reduce pressure in main gas pipeline, particularly for excessive gas energy utilization.

SUBSTANCE: used as electric machine is multipolar induction motor operating in generator mode and performing recovery of energy into supply main. Turbine, electric machine and velocity pickup are arranged in sealed chamber including bushing insulators connected with electric machine and velocity pickup from one side and with supply main through commutator from another side.

EFFECT: increased reliability and energy data.

2 dwg

FIELD: cooling equipment, particularly refrigerators including turbo-expanders operating within wide range of cooling temperatures.

SUBSTANCE: turborefrigeration plant comprises turbo-expander, multi-compartment dynamic heat-exchanger, user of refrigeration, power source and centrifugal turbocompressor. Centrifugal turbocompressor is divided into low-pressure and high-pressure centrifugal stages. Low-pressure stage is mechanically linked with power source. High-pressure stage is mechanically connected to turboexpander. The first heat-exchanger compartment inlet communicates with outlet of user of refrigeration through channel, outlet thereof communicates with atmosphere. The second heat-exchanger compartment inlet is connected to low-pressure turbocompressor stage outlet and outlet thereof is linked with high-pressure turbocompressor stage inlet. The third heat-exchanger compartment inlet is connected to high-pressure turbocompressor stage outlet, outlet thereof is linked with turbo-expander inlet.

EFFECT: increased refrigeration performance, increased reliability of plant actuation and operation, simplified structure, increased operational economy.

2 dwg

Cooling turbine // 2263858

FIELD: cooling and heating equipment; devices used for cooling and heating atmospheric air fed to domestic or industrial rooms.

SUBSTANCE: proposed cooling turbine includes casing, centrifugal multi-stage compressor, multi-stage peripheral-admission turbine whose blades are located between cover shields provided with circular projections over periphery and cover disks. Centrifugal compressor is provided with straightening apparatus at its inlet which has spiral blades with intake holes over periphery of rotor. Multi-stage peripheral-admission turbine is provided with outlet apparatus at its inlet which has spiral blades with outlet holes over periphery of rotor; rotor is mounted on revolving shaft. Working blades are secured on cover shields of rotor. Located in initial row of immovable disks as far as middle one are immovable straightening apparatus with spiral blades of diffuser which are located on fixed axle inside rotor. Located in subsequent row of immovable disks, after middle one, are immovable nozzle sets provided with spiral blades of contraction and secured on fixed axle inside rotor. Middle dividing disk is non-rotating and is rigidly secured on the same axle inside rotor. Rotating blades located on opposite sides of dividing disk are also secured on cover shields of rotor. Fixed axle has hole for passage of additional cooler or heater. On side of drive unit, end tenon of rotor is located between two bearings.

EFFECT: enhanced efficiency under any climatic conditions.

4 dwg

FIELD: pipeline systems for gas distribution, particularly with the use of excessive gas pressure reduced in gas-distribution stations and adapted to obtain electric energy, cold and ice without fuel combustion.

SUBSTANCE: method involves using gas cooled by expanding thereof in expander without external work performing as cooling agent to cool air in refrigerator compartments and in ice generator. Part of cold gas passes in ice generator heat-exchanger connected to energy-cooling plant outlet or to collector linked with outlet of each energy-cooling plant to obtain consumer-demanded gas temperature at ice generator outlet. System for above method implementation includes gas refrigerator with compartments and heat-exchangers arranged in each compartment. The heat-exchangers are connected one to another in series. Outlet of above heat-exchangers is connected to pipeline which conveys gas to consumer. The system is provided with at least one ice generator having heat-exchanger linked to outlet of corresponding energy-cooling plant or with collector connected to outlet of each energy-cooling plant and with pipeline adapted to convey gas to consumer. Energy-cooling plant has turboexpander and electric generator, energy drive with impeller machine, gas refrigerator and ice generator used in the system.

EFFECT: increased efficiency of gas cold usage and environmental safety.

31 cl, 5 dwg

FIELD: power engineering; power generating installations.

SUBSTANCE: the invention is pertaining to the field of power engineering, in particular, to the power generating installations utilizing the energy of the overpressure of the rock gas with realization of the gas-turbine-expansion effect. The gas-turbine-expansion installation for utilization of the compressed rock gas energy contains in series mounted on the high-pressure rock gas mains: the electric heater for preheating of the gas; the turbo-expander kinematically linked with the electric power generator; the power storage battery with a capability of its recharge from the electric generator at the turbo-expander operation in the recharge mode and at connection to the heater in the initial moment of the installation operation with the subsequent switching-off from the heater at the turbo-expander reaching its operational mode. The electrical heater is the resistive heater and connected to the electric power generator through the control unit, which is electrically connected to the temperature sensing devices mounted on the inlet and the outlet of the turbo-expander. Utilization of the invention ensures simplification of the design chart of the power gas-turbine-expansion installation and the capability to regulate the preset temperatures of the gas at the inlet and the outlet of the turbo-expander.

EFFECT: the invention ensures simplification of the design chart of the power gas-turbine-expansion installation and the capability to regulate the preset temperatures of the gas at the inlet and the outlet of the turbo-expander.

2 cl, 2 dwg

FIELD: refrigeration equipment, particularly used to utilize secondary energy and natural source energy having low potential, namely for combined heat and cold production.

SUBSTANCE: refrigeration plant comprises body, turbine, compressor, supply pump, evaporative and condensation chambers and capillary system for working liquid throttling. The body is separated into power and cooling sections by solid partition. Evaporative, working and condensation chambers are created in the power section. Inside surfaces of side evaporative chamber walls and partition are covered with wick. Inner surface of end wall is provided with grooves and covered with thin porous material layer. Shaft extends through body walls, power and cooling sections, solid partition and wick layers. Feed pump rotor is put on shaft end so that the pump is communicated with working liquid reservoir. Arranged in cooling sections are low-temperature evaporative chamber and compressive condensation chamber communicated by compressor to which vapor flow is fed. Compressor rotor is put on shaft.

EFFECT: increased performance.

1 dwg

FIELD: power engineering, possible use in devices for using cold of natural gas at outlet of cryogenic gas expansion machine for ecologically safe cooling of air in chambers of refrigerator.

SUBSTANCE: method for utilization of cold, generated during expansion of natural gas in at least one cryogenic gas expansion machine with diversion of mechanical energy includes letting cold gas prior to feeding to consumer through at least one heat exchanger with cooling in this heat exchanger of intermediate fire and explosion safe liquid coolant. Heat exchanger is made with direct contact of substances. Cooling of air in cooling chamber is performed by letting cold liquid coolant through heat exchanger of refrigerator, which is returned to heat exchanger for cooling by natural gas. Draining of liquid coolant is compensated by natural gas by means of feeding liquid coolant into its circulation contour when level of liquid coolant decreases in heat exchanger. System for utilization of cold, generated during expansion of natural gas with diversion of mechanical energy contains at least one cryogenic gas expansion machine with device for receipt of mechanical energy, connected to source of high pressure natural gas, heat exchanger for cooling of liquid coolant, at least one chamber of refrigerator with heat exchanger and accumulating vessel for liquid coolant with device for controlling level of liquid coolant, connected to pipeline, connecting outlet for liquid coolant of heat exchanger for cooling of liquid coolant to at least one heat exchanger of refrigerator chamber. Vessel is made with possible connection to liquid coolant storage and through valve for discharging gas - to atmosphere when a signal is received by valve from device for controlling level of liquid coolant.

EFFECT: improved efficiency, increased ecological safety and explosion safety of cold utilization.

2 cl, 3 dwg

FIELD: transport engineering.

SUBSTANCE: invention relates to low-capacity turbocompressors-gas-expansion machines for transfer of hot contaminated gas-air mixture and for cooling air in vehicle air conditioning and air cooling system. proposed turbocompressor-gas-expansion machine has housing accommodating shaft installed inside housing on antifriction bearings with fitted on wheels of compressor and turbine-gas-expansion machine secured on ends of shaft. Bearings are grease packed. Bearing unit from side of compressor is installed with clearance relative to housing. clearance is divided by partition made of heat-insulating material into two spaces. Space from side of bearing unit communicates with atmosphere and with outlet of turbine-gas-expansion machine for cooling bearing by part of cooled air flow. Space from side of compressor is sealed to play part of heat shield.

EFFECT: simplified design, reduced overall dimensions of turbocompressor-gas-expansion machine, provision of normal temperature conditions for operation of bearing.

3 cl, 1 dwg

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