Device including steam turbine and condenser

FIELD: power industry.

SUBSTANCE: proposed regenerative cooler is installed in steam flow between steam turbine and condenser by means of which steam leaving the steam turbine is cooled before it enters the condenser and by means of which feed water flow is heated. At least one feed water flow bypass is installed parallel to regenerative cooler so that feed water can bypass the heat exchanger of regenerative cooler and does not participate in energy exchange between feed water and the steam leaving the steam turbine, and at least one valve is installed at intersection of bypass line and feed water flow entering the regenerative cooler; besides, ratio between feed water flow entering the regenerative cooler and feed water flow bypassing the regenerative cooler can be controlled by means of the valve.

EFFECT: invention allows increasing efficiency coefficient even at unsuitable thermodynamic parameters of removed heat.

9 cl, 2 dwg

 

The present invention relates to a device, at least one steam turbine and one capacitor. In addition, the invention relates to a method of operation of the device according to the invention.

Due to the increased public attention to environmental protection, energy consumption, low efficiency under increased scrutiny. Criticism is outdated technology of energy production, due to the rise in atmospheric concentrations of carbon dioxide, which is believed to cause the greenhouse effect. Therefore it is planned to apply penalties to producers of carbon dioxide and to issue so-called certificates for the emission of CO2. As a result of this policy increases economic interest in technology that can produce energy with low greenhouse gas emissions. More stringent measures are taken with regard to the release of nitroxides, which are believed to cause the environment much more serious damage.

In this context, the efficiency of combined production of heat and electrical energy, in particular the efficiency of the device with a steam turbine and a condenser, is of significant interest because it is one of the most effective devices produced for the production of energy from heat which, for the most part a byproduct of the process at a higher level. It is essential that the combined production of heat and electricity well adapted to thermodynamic boundary conditions, to consistently achieved the highest possible efficiency.

One example of environmentally friendly combined heat and power is the generation of energy and heat using oxygen gas. Purified oxygen is mixed with the fuel, in particular methane, and burn under the pressure of approximately 30 bar in the atmosphere of exhaust gas fed back to obtain a high concentration of carbon dioxide, which is subsequently purified and szhizhajut. This very specific process has several limitations, in connection with which the waste heat has a very specific thermodynamic parameters, which make it difficult to quite effective combined production of heat and electricity using a steam turbine.

In the US 6047549 B1 describes a device power plant that combines a gas turbine with heat recovery boiler flue gas at a flow connection with the condensing steam turbine. In the specified device of the gas turbine, coalitionfor exhaust gas and steam turbine adapted to each other, to achieve efficiency of up to 58%. The term "waste" in fact, cannot be applied to heat exhaust gas gas turbine gas turbine was originally designed to supply this heat to the boiler that produces steam for the steam turbine. Currently, there is no well-known concept of using waste heat and a lack of appropriate conditions, allowing steam turbine to operate with high efficiency.

In this regard, the objective of the invention is to develop a device with a steam turbine and a condenser having a high efficiency even under conditions of waste heat, unsuitable for the production of steam in the application of waste heat.

An additional object of the invention is to increase the flexibility of the combined production of heat and electricity using a steam turbine and condenser and increase efficiency even when inappropriate thermodynamic parameters of waste heat.

This problem is solved by a device of the initially mentioned type, with regenerative cooler installed in the steam flow between the steam turbine and the condenser, through which steam, in steam t is rbine, is cooled before entering the condenser, resulting in a flow of feed water is heated.

This device allows you to solve the problem of the rigidity of the steam turbine in relation to thermodynamic conditions when using superheated exhaust steam of the steam turbine, which gives the excess energy during a regenerative heat exchange in the cooler, return this thermal energy to the beginning of the heat cycle. An additional advantage of the device according to the invention is that a set of steam turbine blades are not exposed to wet steam, which usually causes erosion damage to the blades. Also an additional advantage of the object of the invention is that the capacitor due to regenerative cooler is not exposed to superheated steam, and therefore does not require increasing the strength of the capacitor, so that he could withstand high energy and high temperature. In one of the embodiments of the present invention is proposed without any losses associated with the enthalpy of mixing, to guide the entire mass flow of steam leaving the steam turbine in the regenerative cooler. With a sufficient amount of regenerative cooler pressure drop becomes valid, and the device can operate in a wide range is not thermal regimes. The flexibility of the device according to the invention are enhanced when the parallel regenerative cooler has at least one bypass for the flow of feed water to the feed water could bypassibility regenerative cooler and not participate in the exchange of energy between the feed water and steam emerging from the steam turbine. The operating range of the device at high efficiency extended if at least one valve is installed at the intersection of the bypass line and is included in the regenerative cooler flow of feed water, whereby, i.e. the valve may be regulated by the ratio of flow of feed water, which is included in the regenerative cooler, and the flow of feed water, bypassing regenerative cooler. This adjustment can be done automatically through the control unit, which is designed in such a way that the ratio of flow of feed water, which is included in the regenerative cooler, and flow, bypassing regenerative cooler, was regulated depending on the temperature of the steam at the outlet of the specified steam turbine and the condenser inlet. This adjustment device, comprising a steam turbine, condenser, cooler, and a valve which regulates the ratio bypassing Patoka flow of feed water, passing through the cooler, more or less automatically adapts to changes in the input waste energy and high efficiency.

In the device according to the invention can be used advantage of the boiler, through which the heated feed water, respectively, is superheated prior to entering the steam turbine and the boiler is designed to heat produced by the combustion of oxygen and fuel, in particular a mixture of oxygen and hydrogen. The combustion of this mixture, which is also called oxygen gas fuel, together with the returned exhaust gas is produced a mixture containing 85% water and 15% carbon dioxide. The process associated with oxygen gas fuel, imposes strict constraints on thermodynamic cycle of the steam turbine to effectively use the device.

The invention relates not only to the device with a steam turbine, condenser and regenerative cooler installed between them, but also to method of operation of this device.

The above-mentioned features, other features and advantages of the present invention and the means of achieving them will become more apparent and the invention itself will be better understood from the following description of embodiments of the invention is about reference to the accompanying drawings, on which:

Figure 1 - flow chart of the power plant running on an oxygen gas containing device according to the invention.

Figure 2 is a process diagram of a conventional steam power plant, containing the device according to the invention.

Figure 1 shows the block diagram of the device 1 according to the invention, implemented in the plant 2. Equipment 2 power plant consumes air and fuel F and produces carbon dioxide CO2and electricity U.

In the diagram when viewed from the upper left part shows that the air And enters the air separation device AS that which separates the nitrogen (N2from oxygen O2consuming electric power P. the Oxygen O2mixed with CO2in the mixing chamber MC and enters the mixing chamber fuel FMC, where a mixture of O2and CO2mixed with fuel F, which, preferably, consists of methane CH4. Nitrogen (N2who was separated from air, is subjected to compression and liquefaction, which is not shown.

The mixture FMC fuel F oxygen O2and carbon dioxide CO2burn in the boiler B under a pressure of 4.5 bar. Exhaust gas EG in the combustion process at the initial stage loses large particles of ash and the following separation module SM are separated smaller particles of ash. After separation of the ash in Sep the operating module SM part of the exhaust gas EG, which is mainly CO2returned to the mixing chamber MC, where it is mixed with oxygen O2. The other part of the exhaust gas EG, respectively CO2served in the refrigeration unit and the condensation unit CC, where the water is H2O heat h are assigned. The following separator SS S is removed, and the remaining waste gas EG, respectively, purified CO2, then served in the refrigerator C, where again the heat h and the water is H2O removed. Ultimately net CO2is compressed by compressor CO., consuming energy E. Compressed and, preferably, the liquefied CO2is sent in a secure storage, such as pumped in foothill cavity.

The boiler B heats the feed water FW and produces superheated steam SST due to the combustion of the mixture FMC. Feed water FW is fed to the boiler B under a pressure of approximately 5.5 bar with a temperature of 100C and superheated steam SST is supplied by the boiler under pressure of approximately 5,4 bar with a temperature of 540C. Superheated steam SST included in the STG steam turbine, which drives a generator G, which generates electricity U. Superheated steam SST after exiting the steam turbine STG has a pressure of 0.06 bar and a temperature of 150C, therefore, is still overheated. Description steam turbine STG extremely simplified and in most cases, the turbine may be involved in the more than one turbine chamber, working with different input and output pressure and different temperatures of steam. In most cases, the design of the boiler can also be much more complicated and may include multiple connections with a steam turbine STG, for example for re-heating, in particular the intermediate steam heating.

According to the invention superheated SES exhaust steam leaving the steam turbine STG, included in the regenerative cooler REDE.

After exiting the regenerative cooler REDE superheated steam SES becomes wet steam WS under pressure of approximately 0.06 bar and a temperature of 88C. when Entering the condenser CON, which is cooled by the refrigerant COL, for example water, wet steam is condensed in feed water FW. The nutrient water is pumped FWP for water supply and after passing through the jet condenser EU is delivered to the regenerative cooler under pressure of approximately 6 bar and a temperature of approximately 30C. In the regenerative cooler REDE FW feedwater is heated and fed to the boiler Century

The entire mass flow of superheated exhaust steam SES passes through the regenerative cooler REDE and exchanges energy with feed water FW or at least part of the flow of feed water FW. The flow of feed water is divided into a first stream FW1 receiving thermal energy from programasterbation pair SES, and the second thread FW2, baassiri internal heat exchanger EX regenerative cooler REDE. The separation of the valve mechanism is VA, which regulates the mass flow of feed water FW, directing part of the flow through the bypass BY baassiri line EXL heat transfer. Before entering the boiler B, the flow of feed water FW1, FW2 are mixed together again. The valve mechanism VA and segregation of flow of feed water is regulated by the control unit CU, which adjusts the position of valve valve mechanism VA depending on the temperature of the superheated exhaust steam SES before regenerative cooler REDE and, accordingly, the wet steam WS behind regenerative cooler REDE. In addition, the control unit CU adjusts the position of the exhaust valve BOV, especially during the startup process of the device.

Figure 2 is a flow diagram of conventional steam turbine power plant that contains the device according to the invention. The device according to the invention is the same as presented in figure 1, and the drawing is enclosed in a frame made by a dotted line X. In this embodiment, the invention of the steam turbine STG contains two turbine IP cameras and LP, and the average pressure in the first turbine IP camera is higher than the second turbine chamber LP. Par SES, leaving the second turbine ka is a career LP, is overheated. Figure 2 shows the boiler B is more complex structures than in Fig 1, although its image is also simplified.

The air A and the fuel F are fed into the boiler B and burned in several compartments from ST1 to ST6, generating heat and exhaust gas CO2containing additional chemical components, which in most cases are undesirable, for example acid. In the boiler B is the temperature decrease from the high in the first compartment ST1 to the lowest in the sixth compartment ST6. The sixth compartment ST6 acts as a pre-heater feed water FW, and the fourth compartment ST4 and the fifth compartment ST5 act as steam generators, which evaporates the pre-heated feed water FW. Feed water FW turns into steam, which enters the first compartment ST1 and overheats to the highest attainable temperature and is subsequently fed into the first turbine IP camera. After becoming the first turbine IP camera thermal energy into mechanical energy of the exhaust steam IPS included in the second compartment ST2 boiler B, where re-heated. Reheated steam REST, result, has a pressure of approximately 426 bar and a temperature of approximately from 500 to 560C. the reheated vapor REST in the overheated state is entering the second turbine chamber LP and expanding, producing mechanical energy, to the which is converted by the generator G in electricity U. Steam escaping from the second turbine chamber LP is superheated exhaust steam SES and enters the regenerative cooler REDE, as described earlier.

As an addition to the variant embodiment of the invention, represented in figure 1, figure 2 shows that FW feedwater leaves the regenerative cooler REDE with a temperature of from about 70 to 90C and enters the degasser DEAE, where feed water FW escaped, purifying, respectively, from other gases. The gas released during the heating of the feed water steam from the fifth compartment ST5.

The present invention is described based on the preferred design of the device, but can be modified within the essence and scope of the present invention. This application covers any changes, use cases or borrowing of the invention on the basis of its General principles. In addition, this application covers deviations from the present description, which include well-known or user-defined practice in the art to which the present invention relates.

1. The device (1) with at least one steam turbine (STG) and one condenser (CON), characterized in that it is provided with a regenerative cooler (REDE), established in the flow of steam between the steam turbine (STG) and the condenser (CON), through which the steam, leaving the s from the steam turbine (superheated exhaust steam SES), is cooled before entering the condenser (CON), and through which the heated flow of feed water (FW),
in parallel regenerative cooler (REDE) has at least one bypass (BY) for the flow of feed water (FW) so that the feed water could bypassibility exchanger (EX) regenerative cooler (REDE) and did not participate in the exchange of energy between the feed water (FW) and steam (superheated exhaust steam SES), emerging from the steam turbine (STG), and
at least one valve (the valve mechanism VA) installed at the intersection of the line of the bypass (BY) and the flow of feed water (FW), part of the regenerative cooler (REDE), through the valve may be regulated by the ratio between the flow of feed water (FW)within the regenerative cooler (REDE) and the flow of feed water (FW), bypassers regenerative cooler (REDE).

2. The device (1) according to claim 1, characterized in that the entire mass flow of steam leaving the steam turbine (superheated exhaust steam SES), served in the regenerative cooler (REDE).

3. The device (1) according to claim 1 or 2, characterized in that the steam (superheated exhaust steam SES), emerging from the steam turbine (STG), is overheated.

4. The device according to claim 1, characterized in that at least one valve (the valve mechanism VA) is set to pen the section line bypass (BY) and the flow of feed water (FW), included in the regenerative cooler (REDE), through the valve may be regulated by the ratio between the flow of feed water (FW)within the regenerative cooler (REDE) and the flow of feed water (FW), bypassers regenerative cooler (REDE).

5. The device according to claim 4, characterized in that it is provided with a control unit (CU)for adjusting the ratio of flow of feed water (FW1, FW2)included in the regenerative cooler (REDE), and flow bypassing regenerative cooler (REDE), depending on the temperature (T1, T2) steam outlet of the steam turbine (STG) and the inlet of the condenser (CON).

6. The device according to claim 1, characterized in that it is equipped with a boiler (B), which is produced by heating of the feedwater (FW) and, accordingly, overheating prior to entering the steam turbine (STG), while the boiler (B) made with the possibility of heating by the combustion of a mixture of oxygen (O2) and fuel (F), in particular a mixture of oxygen (O2and bicarbonate.

7. The method of operation of the device (1) with steam turbine (STG) and the condenser (CON), characterized in that the regenerative cooler (REDE) is used to cool the steam leaving the steam turbine (STG), while the feed water is heated in the regenerative cooler (REDE) using thermal energy of steam (superheated otrabotannogo SES), this
line of feed water (FW), which is connected with regenerative cooler (REDE), equipped with a bypass line (BY), biasiswa regenerative cooler (REDE), through which at least part of the flow of feed water (FW) can bypassibility regenerative cooler (REDE), and
valves (valve mechanisms VA) establish the line of feed water (FW), a member of the regenerative cooler (REDE), and the line of feed water (FW), biasiswa regenerative cooler (REDE), and regulated depending on the temperature (T1, T2) steam outlet of the steam turbine (STG) and the inlet of the condenser (CON).

8. The method according to claim 7, characterized in that the entire mass flow of superheated steam (superheated exhaust steam SES), emerging from the steam turbine (STG), is introduced into the regenerative cooler (REDE).

9. The method according to one of claims 7 and 8, characterized in that the steam (superheated steam SST), part of the steam turbine (STG), generated by the combustion of the mixture of fuel (F) and oxygen (O2), in particular a mixture of oxygen (O2) and bicarbonate.



 

Same patents:

FIELD: power industry.

SUBSTANCE: proposed regenerative cooler is installed in steam flow between steam turbine and condenser by means of which steam leaving the steam turbine is cooled before it enters the condenser and by means of which feed water flow is heated. At least one feed water flow bypass is installed parallel to regenerative cooler so that feed water can bypass the heat exchanger of regenerative cooler and does not participate in energy exchange between feed water and the steam leaving the steam turbine, and at least one valve is installed at intersection of bypass line and feed water flow entering the regenerative cooler; besides, ratio between feed water flow entering the regenerative cooler and feed water flow bypassing the regenerative cooler can be controlled by means of the valve.

EFFECT: invention allows increasing efficiency coefficient even at unsuitable thermodynamic parameters of removed heat.

9 cl, 2 dwg

FIELD: power engineering.

SUBSTANCE: in the method to control a turbine plant and in a turbine plant providing for the possibility to perform start-up control of load on a reducer within limitations applied onto equipment, used with the turbine plant, there is a stage of temperature rising, at which the temperature of working medium arriving into the turbine is increased; a stage of flow rate rising, at which the working medium flow rate is increased via a bypass that relieves the working medium from the outlet to the inlet of the compressor, when the temperature of the working medium arriving into the turbine is increased with a source of heat; and a stage of working medium flow rate reduction, at which the flow rate of working medium relieved via the bypass is reduced upon expiration of the specified time period after increase of the flow rate via the bypass.

EFFECT: invention makes it possible to increase reliability of turbine plant control.

2 cl, 13 dwg

Up!