CN101858683A - System for producing liquefied natural gas by utilizing liquid nitrogen cold energy - Google Patents
System for producing liquefied natural gas by utilizing liquid nitrogen cold energy Download PDFInfo
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- CN101858683A CN101858683A CN201010161625A CN201010161625A CN101858683A CN 101858683 A CN101858683 A CN 101858683A CN 201010161625 A CN201010161625 A CN 201010161625A CN 201010161625 A CN201010161625 A CN 201010161625A CN 101858683 A CN101858683 A CN 101858683A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 239000007788 liquid Substances 0.000 title claims abstract description 50
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 31
- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 25
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 94
- 239000003345 natural gas Substances 0.000 claims abstract description 44
- 238000003860 storage Methods 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 238000005057 refrigeration Methods 0.000 claims description 26
- 238000004140 cleaning Methods 0.000 claims description 13
- 239000012528 membrane Substances 0.000 claims description 3
- 239000002808 molecular sieve Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 17
- 230000008569 process Effects 0.000 abstract description 16
- 239000004215 Carbon black (E152) Substances 0.000 abstract description 7
- 229930195733 hydrocarbon Natural products 0.000 abstract description 7
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 7
- 238000000746 purification Methods 0.000 abstract description 5
- 239000000047 product Substances 0.000 abstract description 3
- 239000006227 byproduct Substances 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 10
- 239000003507 refrigerant Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 7
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 6
- 238000004088 simulation Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 239000001294 propane Substances 0.000 description 3
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- JVFDADFMKQKAHW-UHFFFAOYSA-N C.[N] Chemical compound C.[N] JVFDADFMKQKAHW-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000004540 process dynamic Methods 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0022—Hydrocarbons, e.g. natural gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0203—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
- F25J1/0204—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle as a single flow SCR cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0221—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using the cold stored in an external cryogenic component in an open refrigeration loop
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0225—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using other external refrigeration means not provided before, e.g. heat driven absorption chillers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/42—Nitrogen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/66—Landfill or fermentation off-gas, e.g. "Bio-gas"
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2220/00—Processes or apparatus involving steps for the removal of impurities
- F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
- F25J2220/64—Separating heavy hydrocarbons, e.g. NGL, LPG, C4+ hydrocarbons or heavy condensates in general
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
- F25J2270/908—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration by regenerative chillers, i.e. oscillating or dynamic systems, e.g. Stirling refrigerator, thermoelectric ("Peltier") or magnetic refrigeration
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention discloses a system for producing liquefied natural gas by utilizing liquid nitrogen cold energy, which comprises purification equipment, a pre-cooling heat exchanger, a gas-liquid separator, a cryogenic tank, a main heat exchanger, a throttle valve, a cryogenic tank, a liquid nitrogen storage tank and a natural gas pipeline, wherein the purification equipment is sequentially connected with a hot fluid channel of the pre-cooling heat exchanger, the gas-liquid separator, a hot fluid channel of the heat exchanger, the throttle valve and the cryogenic tank, and the gas-liquid separator is connected with the cryogenic tank; the liquid nitrogen storage tank is connected with a cold fluid channel of the pre-cooling heat exchanger through a cold fluid channel of the main heat exchanger, and the purification equipment is connected with the natural gas channel. The invention has simple equipment, and can not only obtain LNG products but also obtain liquid light hydrocarbon and other high-added-value side products; and simultaneously, the process is easy to realize skid mounting, and the system is suitable for liquefying and transportation of more dispersedly distributed natural gas resources on land or sea and biogas resources on land.
Description
Technical field
The present invention relates to a kind of system that utilizes liquid nitrogen cold energy to produce liquefied natural gas.Be applicable to the liquefaction of land or marine natural gas.
Background technology
Along with expanding economy, energy crisis manifests day by day, and environmental pollution is serious day by day, natural gas as a kind of pollution less, high-quality clean energy resource that calorific value is high, more and more be subjected to the favor of each country.In recent years, the proved reserves steady-state growth of natural gas, output and sales volume are also continuing to increase.And " enforcement of engineerings such as West-east Gas, " transfer in northern gas south ", " extra large gas disembarkation ", " imported L NG " will effectively promote the development and utilization of China's natural gas.
Because the place of production of natural gas often not in the area that industry is concentrated, is therefore carried and stored is the problem that must solve in the natural gas applications.If with volume or the very high pressure that gaseous state is stored and transport natural gas need be huge, and depress at normal atmosphere, the density of LNG (liquefied natural gas) is equivalent to 600 times of gaseous state, promptly the natural gas after the liquefaction has only 1/600 of original volume, this makes to have very high economy with liquid state storage and transport natural gas, so natural gas liquefaction is a kind of important method of storing and transporting at a distance in a large number.Thereby in the evolution of natural gas industry, liquefied natural gas will be important part.
Abroad the liquefaction flow path of LNG device design, simulation and appraisal have been carried out since the seventies in 20th century.The analog computation of Shell company tandem type, mix refrigerant and nitrogen expansion liquefaction flow path, and analyzed its quality.Nineteen ninety-five, Melaaen has set up base load type natural gas liquefaction flow process dynamic simulation model, and adopts implicit expression DASSL to carry out simulation calculation.1998, Terry adopted HYSYS software, and typical peak regulation type natural gas liquefaction flow process has been carried out analog computation and optimization.1997, Kikkawa designed novel mix refrigerant precooling, decompressor liquefaction flow path, and adopted CHEMCAD software to carry out analog computation.Early 1990s, China begins to carry out the research of natural gas liquefaction flow process theoretical side.Chen Guobang, the big vibration analysis of Zheng the characteristics of peak regulation type LNG device liquefaction flow path, different flow processs and service condition thereof are compared.1992, Guo Donghai is selected by the parameter of mix refrigerant natural gas liquefaction flow process and preliminary discussion has been done in optimization work.1999, Liu Xinwei proposed the nitrogen expansion liquefaction flow path of band recycle compressor and has carried out analog computation at the recovery of coal seam natural gas.Professor Gu Anzhong of Shanghai Communications University leader's seminar has carried out system simulation to the natural gas liquefaction flow process.
Up to now, mature natural gas liquefaction process has in the natural gas liquefaction technical field: the azeotrope kind of refrigeration cycle of throttling refrigeration circulation, expander refrigeration circulation, tandem type kind of refrigeration cycle, azeotrope kind of refrigeration cycle and band precooling, wherein cascade type liquefaction flow process, mix refrigerant liquefaction flow path (comprising open type, enclosed and propane precooling) and band decompressor liquefaction flow path are to use more technological process at present.
The tandem type kind of refrigeration cycle claims the stepwise kind of refrigeration cycle again, is to form with 3 kind of refrigeration cycle cascades of pure hydrocarbon coolants such as propane (or propylene), ethane (or ethene), methane, by the evaporation of refrigerant liquid, provides natural gas liquefaction required cold step by step.In present natural gas liquefaction circulation, tandem type kind of refrigeration cycle energy consumption minimum, most effective, required heat exchange area is less, and kind of refrigeration cycle is independent separately with natural gas liquefaction system, influences each other less, stable operation, adaptability by force, technology maturation.Its shortcoming is that flow process complexity, unit are many, at least 3 compressors will be arranged, and the equipment of producing and storing various cold-producing mediums be arranged, each cooling cycle system does not allow mutual seepage, pipeline and control system complexity, the management and maintenance inconvenience is to purity requirement strictness of cold-producing medium etc.
Mix refrigerant (claiming multi-component refrigrant again) kind of refrigeration cycle is to adopt N
2With hydrocarbon mixture as circulating refrigerant.Compare with the tandem type kind of refrigeration cycle, the hybrid refrigeration liquefaction cycle has that flow process is simple, unit is few, investment cost is low, to the purity requirement of cold-producing medium advantages of higher not.But the energy consumption of single-stage mix refrigerant circulation is than tandem type kind of refrigeration cycle height.
The swell refrigeration circulation is to carry out constant entropy expansion by turbo-expander to reach the cooling purpose.The main circulation of swell refrigeration employing at present has following three kinds: the direct swell refrigeration of (1) natural gas.This circulation has that flow process is simple, facility compact, advantages such as investment is little, adjusting is flexible, reliable operation.(2) nitrogen swell refrigeration.Its advantage is that feed gas composition is changed the adaptability have greatly, and liquefying power is strong, whole system is simple, easy to operate; Its shortcoming is that energy consumption is compared mix refrigerant and circulated high by about 40%.(3) nitrogen-methane blended swell refrigeration.Compare with mix refrigerant circulation, this circulation has that flow process is simple, control easily, start-up time is short, the advantages such as power consumption of saving 10%-20% than pure nitrogen gas swell refrigeration.It is complicated that but it designs, and at present domesticly also do not have ripe experience.
Existing natural gas liquefaction device all adopts the mode of kind of refrigeration cycle that natural gas liquefaction institute chilling requirement is provided, and it is higher that the common drawback of its existence is exactly flowage structure and equipment complexity, cost.Owing to also contain a small amount of light hydrocarbon component in the natural gas except that methane, obtain the liquid light hydrocarbon product in liquefied natural gas in addition, the inevitable two-stage that needs is at least freezed, and has increased the complexity of equipment and flow process.In fact the liquid nitrogen wide material sources are cheap, with the liquefaction of its cold realization natural gas, can save the kind of refrigeration cycle investment, improve system reliability, reduce initial cost etc.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of system that utilizes liquid nitrogen cold energy to produce liquefied natural gas is provided.
The system that utilizes liquid nitrogen cold energy to produce liquefied natural gas comprises cleaning equipment, precool heat exchanger device, gas-liquid separator, low-temperature storage tank, main heat exchanger, choke valve, low-temperature storage tank, liquid nitrogen storage tank and natural gas line; Zone of heat liberation, choke valve and the low-temperature storage tank of the zone of heat liberation of cleaning equipment and precool heat exchanger device, gas-liquid separator, heat exchanger link to each other successively, gas-liquid separator links to each other with low-temperature storage tank, liquid nitrogen storage tank links to each other with the cold fluid pass of precool heat exchanger device through the cold fluid pass of main heat exchanger, and cleaning equipment links to each other with natural gas line.
Described precool heat exchanger device links to each other with auxiliary cooling system.Described auxiliary cooling system is freon refrigeration system or Cryo Refrigerator system.Described cleaning equipment is membrane separation device, molecular sieve adsorption device or chemical absorbing device.Described precool heat exchanger device, main heat exchanger are plate type heat exchanger, pipe heat exchanger, extended surface formula heat exchanger or heat regenerator.
Present device is simple, has save general kind of refrigeration cycle, makes full use of the cryogenic cold energy of liquid nitrogen, finishes the preliminary preliminary treatment and the liquefaction of natural gas by the direct heat transfer process, can also obtain the byproduct that liquid light hydrocarbon etc. has high added value simultaneously.On the other hand, the raw natural gas that has certain pressure can make its condensation temperature increase, and improves the output of LNG product.This flow process is easy to realize skidization simultaneously, the storage and the transportation of the land or marine natural gas resource that being applicable to distributes disperses, and the liquefaction and the transportation of the biogas resource that distributes scattered.
Description of drawings
Fig. 1 utilizes liquid nitrogen to produce the schematic flow sheet of liquefied natural gas;
Fig. 2 is that the liquid nitrogen that utilizes behind the interpolation auxiliary cooling system is produced the schematic flow sheet of liquefied natural gas;
Among the figure: cleaning equipment 1, precool heat exchanger device 2, auxiliary cooling system 3, gas-liquid separator 4, low-temperature storage tank 5, main heat exchanger 6, choke valve 7, low-temperature storage tank 8, liquid nitrogen storage tank 9, natural gas line 10.
The specific embodiment
As shown in the figure, the system that utilizes liquid nitrogen cold energy to produce liquefied natural gas comprises cleaning equipment 1, precool heat exchanger device 2, gas-liquid separator 4, low-temperature storage tank 5, main heat exchanger 6, choke valve 7, low-temperature storage tank 8, liquid nitrogen storage tank 9 and natural gas line 10; Zone of heat liberation, choke valve 7 and the low-temperature storage tank 8 of the zone of heat liberation of cleaning equipment 1 and precool heat exchanger device 2, gas-liquid separator 4, heat exchanger 6 link to each other successively, gas-liquid separator 4 links to each other with low-temperature storage tank 5, liquid nitrogen storage tank 9 links to each other with the cold fluid pass of precool heat exchanger device 2 through the cold fluid pass of main heat exchanger 6, and cleaning equipment 1 links to each other with natural gas line 10.
The described precool heat exchanger device 2 described auxiliary cooling system 3 that links to each other with auxiliary cooling system 3 is freon refrigeration system or Cryo Refrigerator system.Described cleaning equipment 1 is membrane separation device, molecular sieve adsorption device or chemical absorbing device.Described precool heat exchanger device 2, main heat exchanger 6 are plate type heat exchanger, pipe heat exchanger, extended surface formula heat exchanger or heat regenerator.
Natural gas via pipeline 10 with certain pressure is delivered to preliminary purification equipment 1, removes a small amount of CO that wherein contains
2, then enter precool heat exchanger device 2, make the cold nitrogen countercurrent flow that flows out in raw natural gas after the purification and the main heat exchanger 6, it is carried out precooling.Can in the precooling part, add an auxiliary cooling system 3, to reduce precooling temperature (as accompanying drawing 2).After the precooling, light hydrocarbon components such as the ethane that contains in the natural gas, propane will be condensed into liquid, i.e. precool heat exchanger device 2 hot junctions outlet is biphase gas and liquid flow, separate by gas-liquid separator 4.Liquid part will be collected in low-temperature storage tank 5, and gas partly continues to be sent to main heat exchanger 6, carry out heat exchange with liquid nitrogen from liquid nitrogen storage tank 9, make the natural gas liquid that is rich in methane turn to LNG.Last LNG enters low-temperature storage tank 8 by choke valve 7 throttling step-downs.The LNG boil-off gas that throttling produced can be sent into main heat exchanger 6 liquefy once more (not marking among the figure).
Claims (5)
1. a system that utilizes liquid nitrogen cold energy to produce liquefied natural gas is characterized in that comprising cleaning equipment (1), precool heat exchanger device (2), gas-liquid separator (4), low-temperature storage tank (5), main heat exchanger (6), choke valve (7), low-temperature storage tank (8), liquid nitrogen storage tank (9) and natural gas line (10); Zone of heat liberation, choke valve (7) and the low-temperature storage tank (8) of the zone of heat liberation of cleaning equipment (1) and precool heat exchanger device (2), gas-liquid separator (4), heat exchanger (6) link to each other successively, gas-liquid separator (4) links to each other with low-temperature storage tank (5), liquid nitrogen storage tank (9) links to each other with the cold fluid pass of precool heat exchanger device (2) through the cold fluid pass of main heat exchanger (6), and cleaning equipment (1) links to each other with natural gas line (10).
2. a kind of system that utilizes liquid nitrogen cold energy to produce liquefied natural gas according to claim 1 is characterized in that described precool heat exchanger device (2) links to each other with auxiliary cooling system (3).
3. a kind of system that utilizes liquid nitrogen cold energy to produce liquefied natural gas according to claim 2 is characterized in that described auxiliary cooling system (3) is freon refrigeration system or Cryo Refrigerator system.
4. a kind of system that utilizes liquid nitrogen cold energy to produce liquefied natural gas according to claim 1 is characterized in that described cleaning equipment (1) is membrane separation device, molecular sieve adsorption device or chemical absorbing device.
5. a kind of system that utilizes liquid nitrogen cold energy to produce liquefied natural gas according to claim 1 is characterized in that described precool heat exchanger device (2), main heat exchanger (6) are plate type heat exchanger, pipe heat exchanger, extended surface formula heat exchanger or heat regenerator.
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| CN201010161625A CN101858683A (en) | 2010-04-30 | 2010-04-30 | System for producing liquefied natural gas by utilizing liquid nitrogen cold energy |
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| CN201010161625A CN101858683A (en) | 2010-04-30 | 2010-04-30 | System for producing liquefied natural gas by utilizing liquid nitrogen cold energy |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104412055A (en) * | 2012-03-21 | 2015-03-11 | 1304338阿尔伯塔有限公司 | Temperature controlled method to liquefy gas and a production plant using the method |
| CN105135211A (en) * | 2015-08-26 | 2015-12-09 | 成都深冷科技有限公司 | BOG condensation recycling system and method for LNG station |
| CN105135210A (en) * | 2015-08-26 | 2015-12-09 | 成都深冷科技有限公司 | BOG condensation recycling system and method for LNG normal-pressure storage tank |
| CN105387683A (en) * | 2015-12-21 | 2016-03-09 | 刘印同 | Method and device for efficiently liquefying and recovering natural gas |
| CN105605882A (en) * | 2015-12-23 | 2016-05-25 | 中石化石油工程技术服务有限公司 | Method for composite refrigeration natural gas liquefaction |
| CN105820851A (en) * | 2016-06-03 | 2016-08-03 | 鲁基春 | Device and process for preparing LNG from coalbed methane |
| CN106595219A (en) * | 2016-11-03 | 2017-04-26 | 天道新能源科技有限公司 | System for preparing LNG (Liquefied Natural Gas) by using cold supplied by liquefied air |
| CN106839648A (en) * | 2017-02-24 | 2017-06-13 | 杨皓 | A kind of ethylene unit flare gas recovery technique |
| DE102011115987B4 (en) | 2011-10-14 | 2019-05-23 | Linde Aktiengesellschaft | Liquefied Natural gas |
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| CN109959196A (en) * | 2019-03-07 | 2019-07-02 | 西安航天动力研究所 | A kind of wide scope temperature adjusting heat-exchanger rig for methane subzero treatment |
| CN113841020A (en) * | 2019-05-24 | 2021-12-24 | 普莱克斯技术有限公司 | Dual mode Liquefied Natural Gas (LNG) liquefier |
| CN113841020B (en) * | 2019-05-24 | 2023-03-28 | 普莱克斯技术有限公司 | Dual mode Liquefied Natural Gas (LNG) liquefier |
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