The method of transportation of cryogenic liquids and the pipeline for its implementation
(57) Abstract:The invention relates to pipeline transport, in particular to pipelines for transportation of cryogenic environments. The method of transportation of cryogenic liquids in two-pipe pipeline involves creating a reserve length of piping, cooling down the inner pipe of the pipeline to the temperature of the pumping of the product, the injection of a transportable product and controlled temperature regimes and pressure of the pipeline. And after ensuring operation mode of the inner pipe of the pipe to create a vacuum in the annular space. A pipeline for the transportation of cryogenic liquids consists of two concentric installed pipe fixed support and technical means for regulating the temperature and pressure. Outer and inner pipes of the pipeline mounted for movement relative to each other, the outer pipe is provided with two nozzles, and at least two supports each linear section of the pipeline is placed a sealed chamber of a length equal to the longitudinal displacement of this section at the temperature of operation while the camera is connected with the outer pipe TRU the rotation of the heat transfer from the interior of the pipeline and increasing the reliability of operation of the pipeline. 2 S. p. f-crystals, 1 Il. The invention relates to pipeline transport, in particular to pipelines for transportation of cryogenic environments.There is a method of transportation of liquefied natural gas in a mixture with hydrocarbons by pipeline. C. the USSR N 462049, F 17 D 1/02, 1975, BI N 6), including the cooling and liquefaction of the gas in the place of extraction, transport it by pipeline and evaporation device in place of gas consumption, which serves the flow of refrigerant.The disadvantage of this method is the need for cooling of the refrigerant at the consumer due to the evaporation of the liquefied gas and the subsequent transportation of refrigerant to the place of liquefaction of the gas. The refrigerant can reduce losses in the liquefaction of natural gas in the area of production, but the cost of shipping it significantly complicate the design of the pipeline, reduce the reliability of the pipeline process increases the cost of transportation of liquefied gas.You know the transportation by pipeline of liquefied natural gas (Christmas B. B., P. Soloviev S. Peculiarities of calculation and design of pipelines for liquefied natural gas. The construction of pipelines, 1971, No. 6, S. 6-9), as adopted for the prototype, which provide colagenase pipeline condition creates a "stock" length, which is then spent on the floor "shortening" of the pipeline when cooled transported liquefied gas. To create a "stock" lengths of each section of piping between anchors strongly cooled during installation and refrigerated fix. This pipe is made of a multilayer.However, the implementation of operations tahaliyani pipeline and secure fulfillment of the conditions of the temperature management of the pipeline during operation, the placement of various types of insulation significantly complicate the design of the pipeline, reduce the reliability and increase the cost.Known pipeline, consisting of two concentric set of tubes, means for maintaining the pressure in the annular space in the form of a tube with a membrane, indicating the internal cavity of the pipe with the annular space (and. C. the USSR N 956906, F 17 D 5/02, 1982, BI N 33).The disadvantage of the design is the inability to control temperature conditions of the pipeline.Known pipeline for the transportation of cryogenic liquids, consisting of a heat-conducting casing, the inner pipe with holes set in collectors kalawy the th expansion of the material of the pipeline. C. the USSR N 752116, F 17 D 1/04, 1960, BI N 28) adopted for the prototype.A disadvantage of the known device is that when cooling down the inner wall of the pipe to a temperature close to the temperature of the transported medium, is the release of cryogenic fluid in the annulus. During transportation of the liquid will be the heat transfer between the inner pipe and the casing. In addition, the presence of holes in the inner pipe causes stress concentration, lowers the strength of the inner pipe, complicates constructive design.The technical problem solved by the invention, is to prevent heat transfer from the interior of the pipeline through the annulus and improving the reliability of operation of the pipeline.The problem is solved due to the fact that the method of transportation of cryogenic liquids in two-pipe pipeline, including creation of a reserve length of the pipeline, pumping transportable product and controlled temperature regimes and pressure of the pipeline, according to the invention before filing the transported product zakolerovat inner pipe of the pipeline to tempera space.In addition, the problem is solved also due to the fact that in the pipeline for the transportation of cryogenic liquids, consisting of two concentric installed pipe fixed support and technical means for regulating the temperature and pressure, according to the invention, the outer and inner tube mounted for movement relative to each other, the outer pipe is provided with two nozzles, and at least two supports each linear section of the pipeline is placed a sealed chamber of a length equal to the longitudinal displacement of this section at the temperature of operation while the camera is connected with the outer pipe of the pipeline by means of telescopic joints.The invention is illustrated in the drawing, which schematically shows the pipeline.A pipeline for the transportation of cryogenic liquids consists of two concentric set of tubes: an outer tube 1 with the insulating layer and the inner pipe 2. Outer tube 1 is equipped with outlet 3 and the inlet 4 nozzles. The inner tube 2 rests on the supporting device 5. Fixed support 6 of the pipeline is equipped with a stationary sealed chamber 7. Compensators 8 connection the provision of the inner pipe 2 pipe annulus metered (portions) served cooler (transported product) through the inlet pipe 4, and the heated mass is removed through the discharge pipe 3. Metered flow of liquefied gas avoids the sharp increase in pressure in the annular space. Additionally, the pressure in the annular space can be adjusted through a discharge pipe provided with a means of pumping the medium from the annulus (not shown). Annulus allows the internal cooling down of the pipeline, i.e., to provide "stock" length by shortening the pipeline. Telescopic joints provide the necessary "stock" length for external piping.When cooling down, the outer pipe 1 pipe moves relative to the inner tube 2 by the control device 5, and acquires a negative temperature equal to the temperature of the transported product (liquefied natural gas). And moves relative to the sealed chamber 7, which is fixed on the fixed bearing 6 of the pipeline and connected to the outer end of the pipe 1 by means of telescopic joints 8. This allows cooling down the inner pipe of the pipe without giving inside liquefied natural gas. After reaching the inner pipe temperature switch shall lailanie internal pipeline avoids dynamic processes and growth pressures from the temperature difference of the inner surface of the inner pipe of the pipe and the pumped liquid product.Once the annulus is pumped out of the environment and create a vacuum, which is a thermal insulation for the inner pipe.Upon cooling the inner pipe outer pipe is shortened. Compensating for external piping using longitudinal telescopic joints, which connect the outer pipe sealed with a fixed camera, so, telescopic expansion joint seal annulus and the shortening of the outer pipe.The sealed chamber is placed on at least two fixed support each linear section of the pipeline. Cameras provide "stock" length by shortening the inner pipe (line pipe), i.e. the linear portion of the pipe must have at least two sealed chambers, mounted on fixed supports. Fixed support without cameras on a linear plot may not be altogether if the plot of a short length (10 - 30 m), or several dozen, if the length of the plot more than 20,000 feet, for Example, if the pipe length of 100 km is shortened by 10 m, the length of the chamber should be at least 10 m Above constructive OS is and internal pipelines relative to each other.For testing and implementation of the proposed method was constructed a prototype device. In a sealed chamber 1000 and 300 x 20 mm through holes in the side walls placed the pipe from steel Article.3 size 73 x 4 mm and a length of 1200 mm, Then after removing the cap from the pipe flooded the chamber with liquid nitrogen. As the evaporation of the nitrogen was cooled pipe to a temperature of T = -120oC. the temperature in the sealed cavity of the pipe was measured with a thermometer. The shortening of the pipe was measured by metric grids deposited on the outer surface of the pipe. Cooling down pipe was carried out for 4 hours and 25 minutesWhen the temperature in the cavity of the pipe T = - 123oWith its shortening at a pressure of 764 mm RT. senior amounted to 1.6 mm In the subsequent temperature in the system was maintained at the expense of the steady-state conditions.The proposed method for the transportation of cryogenic liquids in two-pipe pipeline allows pumping five times more natural gas in a liquefied state as compared with the traditional trunk pipeline with the same diameter pipe.In addition, the design twin-tube pipeline allows CPA is effective to solve the problem by "shortening" or "lengthening" of the external and especially internal piping. 1. The method of transportation of cryogenic liquids in two-pipe pipeline, including creation of a reserve length of the pipeline, pumping transportable product and controlled temperature regimes and pressure of the pipeline, characterized in that before applying the transported product zakolerovat internal plumbing pipe to a temperature pumping of the product, and after ensuring operation mode of the internal pipe to create a vacuum in the annular space.2. A pipeline for the transportation of cryogenic liquids, consisting of two concentric installed pipe fixed support and technical means for regulating the temperature and pressure, characterized in that the outer and inner tube mounted for movement relative to each other, the outer pipe is provided with two nozzles, and at least two supports each linear section of the pipeline is placed a sealed chamber of a length equal to the longitudinal displacement of this section at the temperature of operation while the camera is connected with the outer pipe of the pipeline by means of telescopic joints.
FIELD: pipeline transport.
SUBSTANCE: power plant is additionally provided with a turbine expander provided with an electric generator. Power generated by the steam plant is directed to the main gas pipeline, and a part of power is directed to the turbine expander with electric generator to produce electric power.
EFFECT: enhanced reliability and efficiency.
1 cl, 1 dwg
FIELD: pipeline transport.
SUBSTANCE: method comprises intensifying extraction of low-pressure gas in tanks of oil stabilization due to rarefying gas in the inlet gas collector that connects the tank with the inlet of liquid-gas jet compressors by mixing the pumping product with active agent and increasing initial pressure of the low-pressure gas up to the pressure required by a consumer with simultaneous condensation of C5+ fraction. The gas-liquid mixture is supplied to the air cooling apparatus. After the separation of gas from the active agent, purifying and drying the compressed gas is intensified by supplying the compressed gas into the vortex pipe and, then, to the consumer.
EFFECT: improved method.
FIELD: oil and gas industry.
SUBSTANCE: device comprises device for enhancing and reducing pressure, receiving gas line for supplying the plant with the gas, discharging gas line through which the gas after purification is supplied from the plant, two vortex pipes, ejector, and condensate collector. The inlet of the first vortex pipe is connected with the receiving gas line and outlet of the cold gas flow of the second vortex pipe through the device for enhancing or reducing pressure. The output of the hot flow of the first vortex pipe is connected with the inlet of the first separator through the ejector, and the condensate outlet of the separator is connected with the inlet of the second vortex pipe. The outlet of the cold flow of the second vortex pipe is connected with the receiving gas.
EFFECT: enhanced quality of purification.
1 cl, 1 dwg
FIELD: preparation and transportation of petroleum associated and natural gases.
SUBSTANCE: invention relates to preparation of gas for transportation along gas pipeline and separation of heavy fraction condensate from gas. Proposed plant for preparation of petroleum associated gas or natural gas for transportation along gas pipeline and obtaining of liquid hydrocarbons from gas intake line, device to increase and decrease pressure, gas flow line, liquid hydrocarbons extraction line, three-circuit heat exchanger, separator, expansion valve, two regulating valves and swirl pipe whose input is connected through pressure increasing and decreasing device from one side with inlet gas line through first regulating valve and through series-connected second regulating valve and first circuit of heat exchanger, and from other side, with output of expansion valve. Output of cold flow of swirl pipe is connected through second circuit of heat exchangers with gas flow line, output of hot flow of swirl pipe is connected through third circuit of heat exchanger with input of separator whose condensate output is connected with line to remove liquid hydrocarbons, and gas output, with input of expansion valve.
EFFECT: increased degree of separation of condensate of heavy fractions of hydrocarbons from petroleum associated gas or natural gas designed for transportation along gas pipeline.
FIELD: the invention refers to energy-conservation technologies of pipeline transportation of natural gas.
SUBSTANCE: it may be used for controlling the technological process of the main pipeline with simultaneous selection out of gas of valuable ethane, propane, butane components. The technical result of the invention is reduction of energy inputs for maintaining pressure in the main pipeline, provision of stabilization of pressure in the main pipeline. The mode of transportation of natural gas along the main pipeline includes its feeding into the main pipeline on the first and the following compressor stations and giving out natural gas from the main pipeline through gas reducing stations and divide it on two flows one of them is directed into the pipeline of high pressure, and the other into a consumer pipe-bend. At that the gas of consumer pipe-bend is preliminary cooled and cleared from condensed and hard fraction, and then further cooling is executed till the temperature below the point of condensation of methane and division of cryogenic liquid and directed to the user, and out of received cryogenic liquid methane is separated from liquid ethane-propane-butane fraction which is returned into the pipeline of high pressure and further into the main pipeline, and detailed methane is directed into the pipe-bend. At that the gas in the pipeline of high pressure is preliminary additionally cooled, compremirated and returned into the main pipeline.
EFFECT: reduces power inputs.
7 cl, 1 dwg
FIELD: storage or transporting of natural gas.
SUBSTANCE: method comprises cooling natural gas down to a temperature below the temperature of the ambient air and transporting the cooled natural gas.
EFFECT: enhanced efficiency of storage and transporting.
16 cl, 13 dwg
FIELD: gas industry.
SUBSTANCE: method comprises separating the mixture into C1 methane fraction with subsequent supply to gas pipeline and C2+ hydrocarbon fraction that are preliminary stabilized by its liquefying by means of preliminary cooling down to a temperature at least 16°C and supplying to the gas pipeline. The pressure is maintained at a level no less than 3,2 MPa.
EFFECT: enhanced reliability of one-phase transporting.
FIELD: oil industry.
SUBSTANCE: supersonic tube comprises Laval nozzle, cyclonic separator with the blade, diffuser for discharging dried gas, and diffuser for discharging condensed liquid. The blade is made of deformed plate set in the screw groove made in the inner side of the cyclonic separator. The length of the plate is at least ½ of the pitch of the screw groove. The housing of the tube of the cyclonic separator receives locking members whose faces enters the screw groove. The distance between the adjacent locking members mounted in the screw groove is equal to the length of the plate.
EFFECT: enhanced efficiency.
FIELD: natural gas industry; other industries; production of the gas pipeline blowoff valves.
SUBSTANCE: the invention is pertaining to natural gas industry and is intended for blowing through of the gas pipelines. The technical result of the invention is the increased efficiency of usage of the gas pipeline blowoff valves at augmentation of the quantity of the delivered for utilization of the waste heavy hydrocarbon fractions of the natural gas for their additional condensation in the area of formation of the microswirlings between the exterior funnel-shaped and interior perforated conical walls. In the gas pipeline blowoff valve in the holes of the perforated conical wall there are the curvilinear grooves, which curvature is directed counterclockwise, and the curvature of the guiding vanes is made in the clockwise direction.
EFFECT: the invention ensures the increased efficiency of usage of the gas pipeline blowoff valves.
FIELD: gas conveyance means, particularly gas-main lines, gathering lines and manifolds of gas fields for condensate recovery.
SUBSTANCE: device to prevent condensate plug forming in pipeline comprises pipeline with inclined sections and connection elbows with enclosing channel. Discharge condensate pipe is formed in lower part of connection elbow. Condensate pipe is located in funnel-shaped enclosing channel and is connected to accumulation vessel located below ground freezing level. Condensate removal pipeline is installed in accumulation vessel so that the condensate removal pipeline is coaxially retained in vertical enclosing channel.
EFFECT: possibility to maintain thermal gas pipeline regime, which prevents condensate freezing, to remove accumulated condensate due to usage of steam condensation heat generated during condensation of steam present in conveying gas flow.