CN102504901A - Method for liquefying natural gas - Google Patents
Method for liquefying natural gas Download PDFInfo
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- CN102504901A CN102504901A CN2011103427039A CN201110342703A CN102504901A CN 102504901 A CN102504901 A CN 102504901A CN 2011103427039 A CN2011103427039 A CN 2011103427039A CN 201110342703 A CN201110342703 A CN 201110342703A CN 102504901 A CN102504901 A CN 102504901A
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- Prior art keywords
- working medium
- natural gas
- refrigeration working
- interchanger
- gets
- Prior art date
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 239000003345 natural gas Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title abstract description 16
- 238000005057 refrigeration Methods 0.000 claims abstract description 82
- 238000001816 cooling Methods 0.000 claims description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 21
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 235000009508 confectionery Nutrition 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 239000003949 liquefied natural gas Substances 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 5
- 229910021529 ammonia Inorganic materials 0.000 claims description 3
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 3
- 239000006200 vaporizer Substances 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 11
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000003507 refrigerant Substances 0.000 abstract 3
- 125000004122 cyclic group Chemical group 0.000 abstract 2
- 239000000047 product Substances 0.000 description 7
- JVFDADFMKQKAHW-UHFFFAOYSA-N C.[N] Chemical compound C.[N] JVFDADFMKQKAHW-UHFFFAOYSA-N 0.000 description 2
- 235000019628 coolness Nutrition 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000002860 competitive effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000004172 nitrogen cycle Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 230000000007 visual effect Effects 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
-
- 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
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
- F25J1/005—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by expansion of a gaseous refrigerant stream with extraction of work
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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
- F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
- F25J1/007—Primary atmospheric gases, mixtures thereof
- F25J1/0072—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
- 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
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
- F25J1/0262—Details of the cold heat exchange system
- F25J1/0264—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams
- F25J1/0265—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams comprising cores associated exclusively with the cooling of a refrigerant stream, e.g. for auto-refrigeration or economizer
- F25J1/0268—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams comprising cores associated exclusively with the cooling of a refrigerant stream, e.g. for auto-refrigeration or economizer using a dedicated refrigeration means
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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
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
- F25J1/0285—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings
- F25J1/0288—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings using work extraction by mechanical coupling of compression and expansion of the refrigerant, so-called companders
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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
- F25J2270/14—External refrigeration with work-producing gas expansion loop
- F25J2270/16—External refrigeration with work-producing gas expansion loop with mutliple gas expansion loops of the same refrigerant
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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
Abstract
The invention relates to a method for liquefying natural gas. The natural gas is cooled and liquefied by a heat exchanger; cold quantity is provided for the heat exchanger through a refrigeration working medium cycle; a refrigeration working medium passes through a cyclic compressor, enters the boost end of a boost turbine expander, is cooled and enters the heat exchanger to be cooled; the refluxed refrigeration working medium exchanges heat with the natural gas through the heat exchanger; the refluxed refrigeration working medium discharged from the heat exchanger enters the cyclic compressor; the refrigeration working medium cycle is performed in a low temperature refrigerator heat exchange unit which is arranged between a hot section and a middle section of the heat exchanger and comprises a low temperature refrigerator and a refrigerant cycled in the low temperature refrigerator; a condenser and an evaporator of the refrigerant are arranged in the low temperature refrigerator; and the refrigeration working medium discharged from the hot section of the heat exchanger enters the low temperature refrigerator, is precooled by the refrigerant, and enters the middle section of the heat exchanger. By the process of liquefying the natural gas, the energy consumption of a unit product is reduced, and an explosion-proof building is not required to be used as a compressor plant for the refrigeration working medium cycle, so that investment is reduced, and cost performance is improved.
Description
Technical field
The present invention relates to a kind of liquifying method of Sweet natural gas, specifically, relate to a kind of nitrogen expansion cycles natural gas liquefaction flow process.
Background technology
In the prior art, middle-size and small-size natural gas liquefaction device often adopts azeotrope (MRC) flow process, nitrogen-methane (N
2-CH
4) flow process, multiple refrigeration liquefying flow paths such as nitrogen cycle expansion flow process.Nitrogen expansion flow process has advantages such as equipment is simple, requirement of explosion proof is low, operation convenient and reliable, but the liquefied natural gas product unit consumption of energy is higher, has influenced its competitive capacity.
Summary of the invention
The purpose of this invention is to provide a kind of shortcoming that overcomes nitrogen expansion flow process, reduce the unit consumption of energy of liquefied natural gas product, make its sexual valence specific energy be superior to the natural gas liquefaction of other flow processs.
For achieving the above object, the technical scheme that the present invention adopts is:
A kind of natural gas liquefaction; The hot arc through interchanger, stage casing, cold section make described Sweet natural gas cooling, liquefaction and cold excessively successively will to meet the requirements of Sweet natural gas through purification; Provide described natural gas liquefaction required cold by refrigeration working medium round-robin refrigeration in the hot arc of described interchanger, stage casing, cold section; Described refrigeration working medium gets into the pressurized end supercharging of booster expansion turbine behind recycle compressor; After cooling, get into cooling in the hot arc, stage casing, cold section of described interchanger more successively; Going out described cold section refrigeration working medium becomes and backflows refrigeration working medium and pass through cold section of described interchanger, stage casing, hot arc successively and described heat exchange gas; The refrigeration working medium that backflows that goes out described hot arc gets into described recycle compressor and accomplishes described refrigeration working medium circulation; The circulation of described refrigeration working medium comprises the hot arc that is arranged at described interchanger and the deep freeze refrigerator heat exchange unit between the stage casing, and described deep freeze refrigerator heat exchange unit comprises deep freeze refrigerator, in described deep freeze refrigerator, carries out the round-robin refrigeration agent, is provided with the condensing surface and the vaporizer of refrigeration agent in the described deep freeze refrigerator; The described refrigeration working medium that goes out the hot arc of described interchanger gets in the described deep freeze refrigerator and by described refrigeration agent and is pre-chilled to specified temperature, gets into the stage casing of described interchanger again.
Preferably, the described refrigeration working medium that goes out described recycle compressor gets into the pressurized end of described booster expansion turbine after cooling off.
Preferably; The pressurized end of described booster expansion turbine comprises first pressurized end, second pressurized end that is in series; The described refrigeration working medium that goes out described first pressurized end (or described second pressurized end) gets into described second pressurized end (or described first pressurized end) after cooling off, the described refrigeration working medium that goes out described second pressurized end (or described first pressurized end) gets into the hot arc of described interchanger after cooling off.
Preferably, the described refrigeration working medium that goes out the stage casing of described interchanger gets into the expanding end step-down cooling of first booster expansion turbine, gets into cold section of described interchanger again.
Preferably, cold section the described refrigeration working medium that goes out described interchanger gets into the expanding end step-down cooling of second booster expansion turbine, becomes the described refrigeration working medium that backflows and gets into cold section of described interchanger.
Preferably, described refrigeration working medium is pure nitrogen gas or dirty nitrogen.
Preferably, the top hole pressure of described recycle compressor is 1.5-3.9MPa, and intake pressure is 0.15-0.7MPa.
Preferably, described refrigeration agent is the refrigeration agent of freonll-11 or ammonia or national legislation permission use.
Preferably, go out cold section of described interchanger through liquefaction, the supercooled natural gas via is crossed becomes liquefied natural gas product after the throttling valve throttling is depressured to specified pressure.
Because technique scheme utilization; The present invention compared with prior art has advantage: because the present invention has adopted the deep freeze refrigerator heat exchange unit; The advantage that had both kept former nitrogen swell refrigeration flow process has reduced the energy consumption of liquefied natural gas product again, has improved cost performance.
Description of drawings
Accompanying drawing 1 is the schematic flow sheet of natural gas liquefaction of the present invention.
In the above accompanying drawing: 1, recycle compressor; 2, first watercooler; 3, first pressurized end; 4, second watercooler; 5, the expanding end of second booster expansion turbine; 6, the expanding end of first booster expansion turbine; 7, second pressurized end; 8, the 3rd watercooler; 9, interchanger is a hot arc; 10, deep freeze refrigerator; 11, the stage casing of interchanger; 12, interchanger is cold section; 13, throttling valve;
101, recycle compressor air inlet; 102, go out the refrigeration working medium of recycle compressor; 103, drag flow round-robin refrigeration working medium; 104, go out the refrigeration working medium of deep freeze refrigerator; 105, go out the refrigeration working medium of the expanding end of first booster expansion turbine; 106, go out the refrigeration working medium that backflows of the expanding end of second booster expansion turbine;
201, meet the requirements of Sweet natural gas through purifying; 202, liquefied Sweet natural gas after cold; 203, liquefied natural gas product.
Embodiment
Below in conjunction with embodiment shown in the drawings the present invention is further described.
Embodiment one: shown in accompanying drawing 1.
A kind of natural gas liquefaction; To have the pressure requirement and through purify reaching Sweet natural gas 201 that liquefaction requires successively hot arc 9, the stage casing 11 through interchanger, make Sweet natural gas 201 coolings, liquefaction and cold excessively for cold section 12, go out cold section 12 liquefaction of interchanger, become liquefied natural gas product 203 after crossing Sweet natural gas 202 after cold 13 throttlings being depressured to specified pressure through throttling valve.
Provide Sweet natural gas 201 liquefaction required cold by the refrigeration working medium in the refrigeration working medium circulation in the hot arc 9 of interchanger, stage casing 11, cold section 12.Refrigeration working medium is pure nitrogen gas or dirty nitrogen.
Refrigeration working medium is compressed to specified pressure through recycle compressor 1, goes out the pressurized end supercharging of the refrigeration working medium 102 of recycle compressor through first watercooler, 2 cooling back entering booster expansion turbines, and the top hole pressure of recycle compressor 1 is 1.5-3.9MPa.The pressurized end of booster expansion turbine comprises first pressurized end 3, second pressurized end 7 that is in series.The refrigeration working medium that goes out first pressurized end 3 gets into second pressurized end 7 through second watercooler, 4 cooling backs, and the refrigeration working medium that goes out second pressurized end 7 becomes drag flow round-robin refrigeration working medium 103 and gets in the hot arc 9 of interchanger and lowers the temperature after the 3rd watercooler 8 cools off.
Refrigeration working medium circulation comprises the hot arc 9 that is arranged at interchanger and the deep freeze refrigerator heat exchange unit between the stage casing 11; The deep freeze refrigerator heat exchange unit comprises deep freeze refrigerator 10, in deep freeze refrigerator 10, carries out the round-robin refrigeration agent, is provided with the condensing surface and the vaporizer of the refrigeration agent that heat exchange uses in the deep freeze refrigerator 10.The refrigeration working medium that goes out the hot arc 9 of interchanger gets in the deep freeze refrigerator 10 and by refrigeration agent and is pre-chilled to specified temperature, becomes the refrigeration working medium 104 that deep freeze refrigerator, gets into stage casing 11 coolings of interchanger again.Refrigeration agent is the refrigeration agent of freonll-11 or ammonia or national legislation permission use.
The refrigeration working medium that goes out the stage casing 11 of interchanger gets into the expanding end 6 step-downs cooling of first booster expansion turbine, and the refrigeration working medium 105 that goes out the expanding end 6 of first booster expansion turbine gets into cold section 12 cooling of interchanger again.Cold section 12 the refrigeration working medium that goes out interchanger gets into the expanding end 5 step-downs cooling of second booster expansion turbine, becomes the refrigeration working medium 106 that backflows.Backflow refrigeration working medium 106 successively through cold section 12 of interchanger, stage casing 11, hot arc 9 re-heats heat up and for Sweet natural gas 201 low-temperature receiver is provided for drag flow round-robin refrigeration working medium 103.
The refrigeration working medium that backflows that goes out hot arc 9 becomes recycle compressor air inlet 101, and it gets into recycle compressor 1 and accomplishes the refrigeration working medium circulation, and the intake pressure of recycle compressor 1 is 0.15-0.7MPa.
Visual convenience of the pressurized end of booster expansion turbine and expanding end and efficient arbitrary combination; For example can be combined as a high temperature pressurised turbo-expander, be combined as a low-temperature turbine boosting expansion machine by the expanding end 5 of second pressurized end 7 and second booster expansion turbine by the expanding end 6 of first pressurized end 3 and first booster expansion turbine; Also can be combined as a low-temperature turbine boosting expansion machine, be combined as a high temperature pressurised turbo-expander by the expanding end 6 of second pressurized end 7 and first booster expansion turbine by the expanding end 5 of first pressurized end 3 and second booster expansion turbine.In the present embodiment, adopt a kind of mode in back.
Adopt booster expansion turbine that refrigeration working medium is introduced series connection supercharging and expansion, because it is the compression ratio and the ratio of expansion of every booster expansion turbine all obviously reduce, thereby can obtain higher efficient, also more safe and reliable.
Booster expansion turbine needs the blanket gas of certain pressure; Sealing gas can extract from second watercooler 4 or the 3rd watercooler 8 backs as required, and to recycle compressor 2, replenishing into from other sources of the gas again, the refrigeration working medium of uniform pressure, identical tolerance gets final product.
The application of technique scheme; The advantage that can keep former nitrogen expansion liquefaction flow path; Overcome the higher shortcoming of nitrogen expansion liquefaction flow path Sweet natural gas unit's product energy consumption; Make it have better cost performance, in certain unit scale scope, can be at war with azeotrope flow process, nitrogen-methane flow process fully.
The foregoing description only is explanation technical conceive of the present invention and characteristics, and its purpose is to let the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (9)
1. natural gas liquefaction; The hot arc through interchanger, stage casing, cold section make described Sweet natural gas cooling, liquefaction and cold excessively successively will to meet the requirements of Sweet natural gas through purification; Provide described natural gas liquefaction required cold by refrigeration working medium round-robin refrigeration in the hot arc of described interchanger, stage casing, cold section; Described refrigeration working medium gets into the pressurized end supercharging of booster expansion turbine behind recycle compressor; After cooling, get into cooling in the hot arc, stage casing, cold section of described interchanger more successively; Going out described cold section refrigeration working medium becomes and backflows refrigeration working medium and pass through cold section of described interchanger, stage casing, hot arc successively and described heat exchange gas; The refrigeration working medium that backflows that goes out described hot arc gets into described recycle compressor and accomplishes described refrigeration working medium circulation; It is characterized in that: the circulation of described refrigeration working medium comprises the hot arc that is arranged at described interchanger and the deep freeze refrigerator heat exchange unit between the stage casing, and described deep freeze refrigerator heat exchange unit comprises deep freeze refrigerator, in described deep freeze refrigerator, carries out the round-robin refrigeration agent, is provided with the condensing surface and the vaporizer of refrigeration agent in the described deep freeze refrigerator; The described refrigeration working medium that goes out the hot arc of described interchanger gets in the described deep freeze refrigerator and by described refrigeration agent and is pre-chilled to specified temperature, gets into the stage casing of described interchanger again.
2. natural gas liquefaction according to claim 1 is characterized in that: the described refrigeration working medium that goes out described recycle compressor gets into the pressurized end of described booster expansion turbine after cooling off.
3. natural gas liquefaction according to claim 1; It is characterized in that: the pressurized end of described booster expansion turbine comprises first pressurized end, second pressurized end that is in series; The described refrigeration working medium that goes out described first pressurized end (or described second pressurized end) gets into described second pressurized end (or described first pressurized end) after cooling off, the described refrigeration working medium that goes out described second pressurized end (or described first pressurized end) gets into the hot arc of described interchanger after cooling off.
4. natural gas liquefaction according to claim 1 is characterized in that: the described refrigeration working medium that goes out the stage casing of described interchanger gets into the expanding end step-down cooling of first booster expansion turbine, gets into cold section of described interchanger again.
5. natural gas liquefaction according to claim 1; It is characterized in that: cold section the described refrigeration working medium that goes out described interchanger gets into the expanding end step-down cooling of second booster expansion turbine, becomes the described refrigeration working medium that backflows and gets into cold section of described interchanger.
6. natural gas liquefaction according to claim 1 is characterized in that: described refrigeration working medium is pure nitrogen gas or dirty nitrogen.
7. natural gas liquefaction according to claim 1 is characterized in that: the top hole pressure of described recycle compressor is 1.5-3.9MPa, and intake pressure is 0.15-0.7MPa.
8. natural gas liquefaction according to claim 1 is characterized in that: described refrigeration agent is the refrigeration agent of freonll-11 or ammonia or national legislation permission use.
9. natural gas liquefaction according to claim 1 is characterized in that: go out cold section of described interchanger through liquefaction, the supercooled natural gas via is crossed becomes liquefied natural gas product after the throttling valve throttling is depressured to specified pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103427039A CN102504901A (en) | 2011-11-03 | 2011-11-03 | Method for liquefying natural gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103427039A CN102504901A (en) | 2011-11-03 | 2011-11-03 | Method for liquefying natural gas |
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| CN102504901A true CN102504901A (en) | 2012-06-20 |
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| CN2011103427039A Pending CN102504901A (en) | 2011-11-03 | 2011-11-03 | Method for liquefying natural gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880024A (en) * | 2015-04-16 | 2015-09-02 | 中国海洋石油总公司 | Natural gas liquefying system for double-expansion cooling process |
| CN109838973A (en) * | 2017-11-27 | 2019-06-04 | 气体产品与化学公司 | For cooling down the improved method and system of hydrocarbon stream |
| CN113701388A (en) * | 2021-04-30 | 2021-11-26 | 中国科学院理化技术研究所 | Multi-element mixed working medium throttling-supersonic speed two-phase expansion composite low-temperature hydrogen liquefying system |
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| CN113701388A (en) * | 2021-04-30 | 2021-11-26 | 中国科学院理化技术研究所 | Multi-element mixed working medium throttling-supersonic speed two-phase expansion composite low-temperature hydrogen liquefying system |
| CN113701388B (en) * | 2021-04-30 | 2022-11-01 | 中国科学院理化技术研究所 | Multi-element mixed working medium throttling-supersonic speed two-phase expansion composite low-temperature hydrogen liquefying system |
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