CN106091574B - Gas liquefaction device with compression heat recovery function and liquefaction method thereof - Google Patents

Gas liquefaction device with compression heat recovery function and liquefaction method thereof Download PDF

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Publication number
CN106091574B
CN106091574B CN201610390586.6A CN201610390586A CN106091574B CN 106091574 B CN106091574 B CN 106091574B CN 201610390586 A CN201610390586 A CN 201610390586A CN 106091574 B CN106091574 B CN 106091574B
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temperature water
refrigerant
gas
heat
room temperature
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CN106091574A (en
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曹卫华
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Sichuan Shudao Equipment Technology Co ltd
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Chengdu Shenleng Liquefaction Plant Co ltd
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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
    • F25J1/0201—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 only internal refrigeration means, i.e. without external refrigeration
    • F25J1/0202—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 only internal refrigeration means, i.e. without external refrigeration in a quasi-closed internal refrigeration loop
    • 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
    • F25J1/0012—Primary atmospheric gases, e.g. air
    • F25J1/0015—Nitrogen
    • 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
    • F25J1/0012—Primary atmospheric gases, e.g. air
    • F25J1/0017—Oxygen
    • 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
    • F25J1/0012—Primary atmospheric gases, e.g. air
    • F25J1/002—Argon
    • 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
    • F25J1/0052—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 vaporising a liquid refrigerant stream
    • 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
    • F25J1/0227—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 within a refrigeration cascade
    • 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
    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F25J1/0235—Heat exchange integration
    • F25J1/0242—Waste heat recovery, e.g. from heat of compression
    • 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
    • F25J1/0259—Modularity and arrangement of parts of the liquefaction unit and in particular of the cold box, e.g. pre-fabrication, assembling and erection, dimensions, horizontal layout "plot"
    • 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
    • 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.
    • 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.
    • F25J1/0296—Removal of the heat of compression, e.g. within an inter- or afterstage-cooler against an ambient heat sink
    • F25J1/0297—Removal of the heat of compression, e.g. within an inter- or afterstage-cooler against an ambient heat sink using an externally chilled fluid, e.g. chilled water
    • 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
    • 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
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/04—Compressor cooling arrangement, e.g. inter- or after-stage cooling or condensate removal
    • 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
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/30—Compression of the feed stream
    • 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
    • F25J2270/906—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration by heat driven absorption chillers

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • Oil, Petroleum & Natural Gas (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The invention discloses a gas liquefaction device with compression heat recovery, which comprises a raw material gas treatment system, a refrigerant treatment system and a compression heat recovery system, and also discloses a liquefaction method of the gas liquefaction device with compression heat recovery. The invention has the beneficial effects that: the low-temperature water is prepared by recovering the compression heat, so that the energy consumption of the liquefaction device is greatly reduced; the low-temperature water tank can also be used for cold storage, low-temperature water or ice can be additionally prepared according to the electricity price difference, and the low-temperature water can be fed only at the peak or peak electricity price, so that the energy consumption of the liquefaction device is further reduced; the method has the advantages of simple operation, low energy consumption, accordance with the great trend of energy conservation and consumption reduction, and good social and economic benefits.

Description

A kind of gas liquefaction equipment and its liquifying method of band compression recuperation of heat
Technical field
The present invention relates to the technical field of gas cryogenic liquefying, especially a kind of gas liquefaction equipment of band compression recuperation of heat And its liquifying method.
Background technology
Small (such as 1m of cryogenic liquid product (liquid oxygen, liquid nitrogen, liquid argon, liquid hydrogen and LNG etc.)3Liquid oxygen be equivalent to 800Nm3Oxygen, such as 1m3Liquid hydrogen be equivalent to 788Nm3Hydrogen, 1m3LNG be equivalent to 600Nm3Natural gas), convenient for length Distance transport, radiation areas are wide, while mileage travelled is longer when the conduct motor vehicle fuel such as liquid hydrogen, LNG.Therefore, production liquid production The liquefying plant of product industrially has very important effect.
The heat of compression of conventional gas liquefying plant is taken away by recirculated water, then recycles and make after being cooled down by circulating water cooling tower With the heat of compression wastes and needs to consume a large amount of recirculated waters, causes the energy consumption of conventional gas liquefying plant higher.
Invention content
It is an object of the invention to overcome the prior art, a kind of gas liquefaction equipment of band compression recuperation of heat is provided And its liquifying method.
The purpose of the present invention is achieved through the following technical solutions：A kind of gas liquefaction equipment of band compression recuperation of heat, it Including raw material gas processing system, refrigerant processes system, compression heat recovery system；
The raw material gas processing system includes feed gas compressor, unstripped gas room temperature water cooler, unstripped gas water at low temperature Cooler, raw material gas purifying unit and gas liquefaction heat exchanger, wherein unstripped gas input channel is connect with feed gas compressor, Feed gas compressor is connected to unstripped gas room temperature water cooler, and unstripped gas room temperature water cooler connects with unstripped gas low temperature water cooler Logical, unstripped gas low temperature water cooler is connected to raw material gas purifying unit, and raw material gas purifying unit is connected to gas liquefaction heat exchanger；
The refrigerant processes system includes refrigerant compressor, refrigerant room temperature water cooler, refrigerant low temperature water cooling But device and gas liquefaction heat exchanger, the refrigerant compressor are connected to refrigerant room temperature water cooler, refrigerant room temperature water cooling But device is connected to refrigerant low temperature water cooler, and refrigerant low temperature water cooler is connected to gas liquefaction heat exchanger, the gas Body liquefaction heat exchanger is connected to refrigerant compressor；
The compression heat recovery system includes room temperature water pot, room temperature water pump, refrigeration unit and water cooler, and described is normal A plurality of branch pipe is provided on the outlet pipe of warm water tank, wherein the first branch pipe is connect with room temperature water pump, the second branch pipe and water cooler Connection, third branch pipe are connected to refrigeration unit, and the refrigerant room temperature water cooler goes out with unstripped gas room temperature water cooler Water pipe is connected to by same pipeline with refrigeration unit, and valve is provided on the pipeline, the refrigerant low temperature water cooling But the oral siphon of device and unstripped gas low temperature water cooler is connected to by same pipeline with refrigeration unit, and in the pipeline and is entered Valve is both provided on water pipe, the oral siphon of the refrigerant room temperature water cooler and unstripped gas room temperature water cooler passes through Same pipeline is connected to room temperature water pump, and valve is provided on the oral siphon, the water outlet of the unstripped gas low temperature water cooler Pipe is connected to the oral siphon of unstripped gas room temperature water cooler, and the outlet pipe and refrigerant of the refrigerant low temperature water cooler are normal The oral siphon of warm water cooler is connected to.
Unstripped gas heat exchanger channels, high pressure cryogen heat exchanger channels and low pressure cryogen are provided in the gas liquefaction heat exchanger The entrance of heat exchanger channels, the unstripped gas heat exchanger channels is connected to raw material gas purifying unit, the outlet of unstripped gas heat exchanger channels It is connect with liquid storage tank, the entrance of the high pressure cryogen heat exchanger channels is connected to refrigerant low temperature water cooler, and high pressure is cold The outlet of agent heat exchanger channels is connected to the entrance of low pressure cryogen heat exchanger channels, and cryogen throttling is provided on the pipeline of connection The outlet of valve, the low pressure cryogen heat exchanger channels is connected to refrigerant compressor.
Be provided in the refrigeration unit and side and evaporation side occur, one end of the generation side with to be connected to refrigerant normal Warm water cooler outlet pipe is connected to the pipeline of unstripped gas room temperature water cooler outlet pipe, and the other end and water cooler of side occurs Connection, one end of the evaporation side is connected to third branch pipe, the other end of evaporation side be connected to refrigerant low temperature water cooler Oral siphon is connected to the pipeline of unstripped gas low temperature water cooler oral siphon.
On the pipeline being connected to unstripped gas room temperature water cooler oral siphon with cryogen room temperature water cooler oral siphon It is additionally provided with a low temperature water pot and low temperature water pump, on the pipeline, before the conveying direction with water at low temperature is, the low temperature water pump Positioned at the downstream of low temperature water pot
A kind of liquifying method of the gas liquefaction equipment of band compression recuperation of heat, it includes the following steps,
S1：Unstripped gas compression cooling, unstripped gas is after feed gas compressor is pressurized, successively by unstripped gas room temperature water cooler It is cooled down with unstripped gas low temperature water cooler, while the heat of compression is taken away by heat transport fluid；
S2：Raw material gas liquefaction, the unstripped gas after being pre-chilled by S1 remove wherein easy frozen block or corrosion through raw material gas purifying unit After property impurity, into the unstripped gas heat exchanger channels of gas liquefaction heat exchanger, by low pressure cold of backflowing in gas liquefaction heat exchanger Agent precooling after liquefying and being subcooled, is re-fed into fluid product basin or rectifying column；
S3：Refrigerant compression, refrigerant is after refrigerant compressor is pressurized, successively by room temperature water cooler and low temperature water cooling Device cools down, while the heat of compression is taken away by heat transport fluid；
S4：Refrigerant liquefaction, the refrigerant after being pre-chilled by S3 enter the high pressure cryogen heat exchanger channels of gas liquefaction heat exchanger In, low pressure of being backflowed in gas liquefaction heat exchanger cryogen precooling, after liquefying and being subcooled, then through cryogen throttle valve throttling refrigeration；
S5：Refrigerant re-heat, the low pressure cryogen that the low pressure cryogen being throttled in S4 is back to gas liquefaction heat exchanger change In the passage of heat, the entrance of refrigerant compressor is returned after the gasification of hot-fluid stock, re-heat to room temperature wherein, a refrigeration is formed and follows Ring；
S6：Heat transport fluid cools down, and the heat transport fluid that the heat of compression is absorbed in S1 and S3 steps enters the hair of refrigeration unit Device is cooled by water again in raw side, after release heat to be further cooled and returned in room temperature water pot；
S7, normal-temperature water, water at low temperature supply, the normal-temperature water come from room temperature water pot are divided into two strands, one normal-temperature water is through normal-temperature water The entrance of unstripped gas room temperature water cooler and refrigerant room temperature water cooler is sent into after pump pressurization；Another burst of normal-temperature water enters refrigeration In the evaporation side of unit, the water at low temperature that release heat is produced wherein is admitted to unstripped gas low temperature water cooler and refrigerant is low The entrance of warm water cooler.
A kind of liquifying method of the gas liquefaction equipment of band compression recuperation of heat, it includes the following steps,
S1：Unstripped gas compression cooling, unstripped gas is after feed gas compressor is pressurized, successively by unstripped gas room temperature water cooler It is cooled down with unstripped gas low temperature water cooler, while the heat of compression is taken away by heat transport fluid；
S2：Raw material gas liquefaction, the unstripped gas after being pre-chilled by S1 remove wherein easy frozen block or corrosion through raw material gas purifying unit After property impurity, into the unstripped gas heat exchanger channels of gas liquefaction heat exchanger, by low pressure cold of backflowing in gas liquefaction heat exchanger Agent precooling after liquefying and being subcooled, is re-fed into fluid product basin or rectifying column；
S3：Refrigerant compression, refrigerant is after refrigerant compressor is pressurized, successively by room temperature water cooler and low temperature water cooling Device cools down, while the heat of compression is taken away by heat transport fluid；
S4：Refrigerant liquefaction, the refrigerant after being pre-chilled by S3 enter the high pressure cryogen heat exchanger channels of gas liquefaction heat exchanger In, low pressure of being backflowed in gas liquefaction heat exchanger cryogen precooling, after liquefying and being subcooled, then through cryogen throttle valve throttling refrigeration；
S5：Refrigerant re-heat, the low pressure cryogen that the low pressure cryogen being throttled in S4 is back to gas liquefaction heat exchanger change In the passage of heat, the entrance of refrigerant compressor is returned after the gasification of hot-fluid stock, re-heat to room temperature wherein, a refrigeration is formed and follows Ring；
S6：Heat transport fluid cools down, and the heat transport fluid that the heat of compression is absorbed in S1 and S3 steps enters the hair of refrigeration unit Device is cooled by water again in raw side, after release heat to be further cooled and returned in room temperature water pot；
S7, normal-temperature water supply, the normal-temperature water come from room temperature water pot are divided into two strands, after the frequent warm water pump pressurization of one normal-temperature water It is sent into the entrance of unstripped gas room temperature water cooler and refrigerant room temperature water cooler；
S8, water at low temperature are supplied, and another burst of normal-temperature water in S7 enters in the evaporation side of refrigeration unit, discharges heat wherein The water at low temperature produced is admitted in low temperature water pot, and the water at low temperature in low temperature water pot is sent into unstripped gas after low temperature water pump pressurizes The entrance of low temperature water cooler and refrigerant low temperature water cooler, for reducing compressor inlet temperatures at different levels, to reduce pressure Contracting power consumption.
The operating temperature of high-temperature water after the normal-temperature water, water at low temperature and heat transport fluid heat absorption is respectively 20~60 DEG C, 5~30 DEG C, 100~300 DEG C.
The unstripped gas is described to be one or more in oxygen, nitrogen, hydrogen, natural gas liquefaction or liquid space division Refrigerant be air, nitrogen, natural gas, n-formyl sarcolysine alkane it is one or more.
The series of the feed gas compressor and refrigerant compressor be 1~4 grade or section, grade or intersegmental and outlet are equal It is cooled down using normal-temperature water and water at low temperature tandem, the refrigeration unit is lithium bromide absorption refrigerating set or absorption refrigeration With the combination machine of compression-type refrigeration, the water cooler is the one or more of air-cooled, water-cooling type or absorption heat pump.
The heat transport fluid is softened water, desalted water, steam, conduction oil, ethylene glycol or methanol aqueous solution.
The present invention has the following advantages：
1, water at low temperature is produced by recycling the heat of compression, the energy consumption of liquefying plant is greatly reduced；
2, low temperature water pot can be also used for cold-storage, can also can only exist according to water at low temperature or ice is produced outside electricity price difference It is sent into water at low temperature when spike or peak electricity tariff, further decreases the energy consumption of liquefying plant；
3, the present invention have it is easy to operate, low energy consumption, meet energy-saving main trend, have good social benefit and Economic benefit.
Description of the drawings
Fig. 1 is the structural schematic diagram of embodiment one；
Fig. 2 is the structural schematic diagram of embodiment two；
In figure, 1- low temperature water pumps, 2- low temperature water pots, 3- feed gas compressors, 4- refrigerant compressors, 5- refrigerant normal-temperature waters Cooler, 6- refrigerant low temperature water coolers, 7- unstripped gas heat exchanger channels, 8- high pressure cryogen heat exchanger channels, 9- low pressure cryogens change The passage of heat, 10- room temperature water pots, 11- room temperature water pumps, 12- generations side, 13- evaporation sides, 14- refrigeration units, 15- water coolers, 16- unstripped gas room temperature water coolers, 17- unstripped gas low temperature water coolers, 18- raw material gas purifying units, 19- gas liquefactions heat exchange Device, 20- cryogen throttle valves.
Specific implementation mode
The present invention will be further described below in conjunction with the accompanying drawings, and protection scope of the present invention is not limited to as described below：
Embodiment one：
As shown in Figure 1, a kind of gas liquefaction equipment of band compression recuperation of heat, it includes raw material gas processing system, refrigerant Processing system, compression heat recovery system；
In the present embodiment, the raw material gas processing system includes feed gas compressor 3, unstripped gas room temperature water cooler 16, unstripped gas low temperature water cooler 17, raw material gas purifying unit 18 and gas liquefaction heat exchanger 19, wherein unstripped gas input pipe Road is connect with feed gas compressor 3, and feed gas compressor 3 is connected to unstripped gas room temperature water cooler 16, and feed compressor 3 with One unstripped gas supply line connects, and in the present embodiment, the unstripped gas is oxygen, nitrogen, hydrogen, natural gas liquefaction or liquid One or more in body space division, unstripped gas room temperature water cooler 16 is connected to unstripped gas low temperature water cooler 17, and unstripped gas is low Warm water cooler 17 is connected to raw material gas purifying unit 18, and raw material gas purifying unit 18 is connected to gas liquefaction heat exchanger 19, A discharge duct is additionally provided on raw material gas purifying unit 18, discharge duct is mainly used for the discharge of carbon dioxide and water；
In the present embodiment, the refrigerant processes system include refrigerant compressor 4, refrigerant room temperature water cooler 5, Refrigerant low temperature water cooler 6 and gas liquefaction heat exchanger 19, the refrigerant compressor 4 and refrigerant room temperature water cooler 5 Connection, the refrigerant be air, nitrogen, natural gas, n-formyl sarcolysine alkane it is one or more, refrigerant room temperature water cooler 5 with Refrigerant low temperature water cooler 6 is connected to, and refrigerant low temperature water cooler 6 is connected to gas liquefaction heat exchanger 19, the gas Liquefaction heat exchanger 19 is connected to refrigerant compressor 4；
In the present embodiment, the compression heat recovery system includes room temperature water pot 10, room temperature water pump 11, refrigeration unit 14 With water cooler 15, a plurality of branch pipe is provided on the outlet pipe of the room temperature water pot 10, wherein the first branch pipe and room temperature water pump 11 connections, the second branch pipe are connected to water cooler 15, and third branch pipe is connected to refrigeration unit 14, the refrigerant room temperature water cooling But device 5 is connected to by same pipeline with refrigeration unit 14 with the outlet pipe of unstripped gas room temperature water cooler 16, and in the pipeline On be provided with valve, the oral siphon of the refrigerant low temperature water cooler 6 and unstripped gas low temperature water cooler 17 is by same One pipeline is connected to refrigeration unit 14, and valve is both provided on the pipeline and oral siphon, the refrigerant room temperature water cooling But device 5 is connected to by same pipeline with room temperature water pump 11 with the oral siphon of unstripped gas room temperature water cooler 16, and the oral siphon On be provided with valve, the oral siphon of the outlet pipe and unstripped gas room temperature water cooler 16 of the unstripped gas low temperature water cooler 17 Connection, the outlet pipe of the refrigerant low temperature water cooler 6 are connected to the oral siphon of refrigerant room temperature water cooler 5.
In the present embodiment, unstripped gas heat exchanger channels 7 are provided in the gas liquefaction heat exchanger 19, high pressure cryogen changes The passage of heat 8 and low pressure cryogen heat exchanger channels 9, the entrance of the unstripped gas heat exchanger channels 7 are connected to raw material gas purifying unit 18, The outlet liquid storage tank connection of unstripped gas heat exchanger channels 7, i.e., the fluid product come out from unstripped gas heat exchanger channels 7 can lead to Liquid storage tank storage is crossed, can also be entered directly into downstream process, the entrance and system of the high pressure cryogen heat exchanger channels 8 Cryogen low temperature water cooler 6 is connected to, and the outlet of high pressure cryogen heat exchanger channels 8 is connected to the entrance of low pressure cryogen heat exchanger channels 9, and Cryogen throttle valve 20 is provided on the pipeline of connection, outlet and the refrigerant compressor 4 of the low pressure cryogen heat exchanger channels 9 connect It is logical.
In the present embodiment, the refrigeration unit 14 is the combination of lithium bromide absorption refrigerating set and compression-type refrigeration Machine is arranged inside and side 12 and evaporation side 13 occurs, one end of the generation side 12 be connected to refrigerant room temperature water cooler 5 Outlet pipe is connected to the pipeline of 16 outlet pipe of unstripped gas room temperature water cooler, and the other end and water cooler 15 that side 12 occurs connect Logical, one end of the evaporation side 13 is connected to third branch pipe, the other end of evaporation side 13 be connected to refrigerant low temperature water cooling 6 oral siphon of device is connected to the pipeline of 17 oral siphon of unstripped gas low temperature water cooler.
A kind of liquifying method of the gas liquefaction equipment of band compression recuperation of heat, it includes the following steps,
S1：Unstripped gas compression cooling, unstripped gas is after the supercharging of feed gas compressor 3, successively by unstripped gas room temperature water cooling Device 16 and unstripped gas low temperature water cooler 17 cool down, while the heat of compression is taken away by heat transport fluid；
S2：Raw material gas liquefaction, the unstripped gas after being pre-chilled by S1 remove wherein easy frozen block or corruption through raw material gas purifying unit 18 After corrosion impurity, into the unstripped gas heat exchanger channels 7 of gas liquefaction heat exchanger 19, backflowed in gas liquefaction heat exchanger 19 The precooling of low pressure cryogen after liquefying and being subcooled, is re-fed into fluid product basin or rectifying column；
S3：Refrigerant compression, refrigerant is after the supercharging of refrigerant compressor 4, successively by room temperature water cooler 5 and low temperature water cooling But device 6 cools down, while the heat of compression is taken away by heat transport fluid；
S4：Refrigerant liquefaction, the high pressure cryogen heat exchange that the refrigerant after being pre-chilled by S3 enters gas liquefaction heat exchanger 19 are logical In road 8, low pressure of being backflowed in gas liquefaction heat exchanger 19 cryogen precooling, liquefy and be subcooled after, then through cryogen throttle valve 20 save Stream refrigeration；
S5：Refrigerant re-heat, the low pressure cryogen being throttled in S4 are back to the low pressure cryogen of gas liquefaction heat exchanger 19 In heat exchanger channels 9, the entrance of refrigerant compressor 4 is returned after the gasification of hot-fluid stock, re-heat to room temperature wherein, forms a refrigeration Cycle；
S6：Heat transport fluid cools down, and the heat transport fluid that the heat of compression is absorbed in S1 and S3 steps enters refrigeration unit 14 Occur in side 12, being cooled by water device 15 again after release heat is further cooled and returned in room temperature water pot 10；
S7, normal-temperature water, water at low temperature supply, are divided into two strands, one normal-temperature water is through room temperature from the normal-temperature water of room temperature water pot 10 Water pump 11 is sent into the entrance of unstripped gas room temperature water cooler 16 and refrigerant room temperature water cooler 5 after pressurizeing；Another burst of normal-temperature water Into in the evaporation side 13 of refrigeration unit 14, the water at low temperature that heat is produced is discharged wherein and is admitted to unstripped gas low temperature water cooling The entrance of device 17 and refrigerant low temperature water cooler 6, to which water at low temperature is continuously introduced into raw material gas processing system and refrigerant processes In system, equipment investment and floor space are reduced.
In the present embodiment, the operating temperature of the high-temperature water after the normal-temperature water, water at low temperature and heat transport fluid heat absorption Respectively 20~60 DEG C, 5~30 DEG C, 100~300 DEG C.
In the present embodiment, the pressure at expulsion of raw air compressor 3 and refrigerant compressor 4 be respectively 0.5MPa.G and The series of 3.7MPa.G, the feed gas compressor 3 and refrigerant compressor 4 be 1~4 grade or section, be preferably all made of 2 Grade, grade or intersegmental and outlet are all made of normal-temperature water and the cooling of water at low temperature tandem.
In the present embodiment, the water cooler is the one or more of air-cooled, water-cooling type or absorption heat pump.
In the present embodiment, the heat transport fluid is softened water, desalted water, steam, conduction oil, ethylene glycol or methanol-water Solution.
In the present embodiment, by taking a set of KDON-3000Y/2000Y types liquid space division as an example, the energy with conventional liq space division Consumption is compared, and shown in day following table, the energy consumption range of decrease 7.44%, year saves up to 1,260,000 yuan of the electricity charge.
Embodiment two：
As shown in Fig. 2, the present embodiment and the device of embodiment one are substantially the same, the difference lies in that described normal with cryogen It is additionally provided with a low temperature water pot 2 on the pipeline that 5 oral siphon of warm water cooler is connected to 16 oral siphon of unstripped gas room temperature water cooler With low temperature water pump 1, on the pipeline, before the conveying direction with water at low temperature is, the low temperature water pump 1 is located at low temperature water pot 2 Downstream, low temperature water pot 2 can supplement water at low temperature by a water at low temperature supply line, ensure the lasting supply of water at low temperature, so that Water at low temperature can be continuously introduced into liquefying plant, can also be sent into spike or peak electricity tariff, and can also be in trough-electricity Water at low temperature is produced by compression refrigerating machine when valence, water at low temperature is supplemented in spike or peak electricity tariff and is sent into liquefying plant, into One step reduces energy consumption, and a kind of liquifying method of the gas liquefaction equipment of band compression recuperation of heat in the present embodiment, with reality The method for applying example one is compared, and step S1~S6 all sames increase two method and steps, i.e., on the basis of S1~S6：
S7, normal-temperature water supply, are divided into two strands, the frequent warm water pump 11 of one normal-temperature water adds from the normal-temperature water of room temperature water pot 10 The entrance of unstripped gas room temperature water cooler 16 and refrigerant room temperature water cooler 5 is sent into after pressure；
S8, water at low temperature are supplied, and another burst of normal-temperature water in S7 enters in the evaporation side 13 of refrigeration unit 14, discharges wherein The water at low temperature that heat is produced is admitted in low temperature water pot 2, and the water at low temperature in low temperature water pot 2 is sent into after the pressurization of low temperature water pump 1 The entrance of unstripped gas low temperature water cooler 17 and refrigerant low temperature water cooler 6, for reducing compressor inlet temperatures at different levels, from And reduce compression power consumption.

Claims (10)

1. a kind of gas liquefaction equipment of band compression recuperation of heat, it is characterised in that：It includes raw material gas processing system, at refrigerant Reason system, compression heat recovery system；
The raw material gas processing system includes feed gas compressor（3）, unstripped gas room temperature water cooler（16）, unstripped gas low temperature Water cooler（17）, raw material gas purifying unit（18）With gas liquefaction heat exchanger（19）, wherein unstripped gas input channel and raw material Air compressor（3）Connection, feed gas compressor（3）With unstripped gas room temperature water cooler（16）Connection, unstripped gas room temperature water cooling Device（16）With unstripped gas low temperature water cooler（17）Connection, unstripped gas low temperature water cooler（17）With raw material gas purifying unit（18） Connection, raw material gas purifying unit（18）With gas liquefaction heat exchanger（19）Connection；
The refrigerant processes system includes refrigerant compressor（4）, refrigerant room temperature water cooler（5）, refrigerant water at low temperature Cooler（6）With gas liquefaction heat exchanger（19）, the refrigerant compressor（4）With refrigerant room temperature water cooler（5）Connection, Refrigerant room temperature water cooler（5）With refrigerant low temperature water cooler（6）Connection, refrigerant low temperature water cooler（6）With gas Liquefaction heat exchanger（19）Connection, the gas liquefaction heat exchanger（19）With refrigerant compressor（4）Connection；
The compression heat recovery system includes room temperature water pot（10）, room temperature water pump（11）, refrigeration unit（14）And water cooler （15）, the room temperature water pot（10）Water pipe on be provided with a plurality of branch pipe, wherein the first exit branch and room temperature water pump（11） Connection, second enters water branch pipe and water cooler（15）Connection, third exit branch and refrigeration unit（14）Connection, the refrigeration Agent room temperature water cooler（5）With unstripped gas room temperature water cooler（16）Outlet pipe pass through same pipeline and refrigeration unit（14） Connection, and valve is provided on the pipeline, the refrigerant low temperature water cooler（6）With unstripped gas low temperature water cooler （17）Oral siphon pass through same pipeline and refrigeration unit（14）Connection, and it is both provided with valve on the pipeline and oral siphon Door, the refrigerant room temperature water cooler（5）With unstripped gas room temperature water cooler（16）Oral siphon pass through same pipeline With room temperature water pump（11）Connection, and valve is provided on the oral siphon, the unstripped gas low temperature water cooler（17）Water outlet Pipe and unstripped gas room temperature water cooler（16）Oral siphon connection, the refrigerant low temperature water cooler（6）Outlet pipe with Refrigerant room temperature water cooler（5）Oral siphon connection.
2. a kind of gas liquefaction equipment of band compression recuperation of heat according to claim 1, it is characterised in that：The gas Liquefaction heat exchanger（19）Inside it is provided with unstripped gas heat exchanger channels（7）, high pressure cryogen heat exchanger channels（8）With low pressure cryogen heat exchanger channels （9）, the unstripped gas heat exchanger channels（7）Entrance and raw material gas purifying unit（18）Connection, unstripped gas heat exchanger channels（7）'s Outlet is connect with liquid storage tank or rectifying column, the high pressure cryogen heat exchanger channels（8）Entrance and refrigerant low temperature water cooling But device（6）Connection, high pressure cryogen heat exchanger channels（8）Outlet and low pressure cryogen heat exchanger channels（9）Entrance connection, and be connected to Pipeline on be provided with cryogen throttle valve（20）, the low pressure cryogen heat exchanger channels（9）Outlet and refrigerant compressor（4）Even It is logical.
3. a kind of gas liquefaction equipment of band compression recuperation of heat according to claim 2, it is characterised in that：The refrigeration Unit（14）It is inside provided with and side occurs（12）And evaporation side（13）, the generation side（12）One end be connected to refrigerant room temperature Water cooler（5）Outlet pipe and unstripped gas room temperature water cooler（16）The pipeline of outlet pipe is connected to, and side occurs（12）The other end With water cooler（15）Connection, the evaporation side（13）One end be connected to third exit branch, evaporation side（13）It is another It holds and is connected to refrigerant low temperature water cooler（6）Oral siphon and unstripped gas low temperature water cooler（17）The pipeline of oral siphon is connected to.
4. a kind of gas liquefaction equipment of band compression recuperation of heat according to claim 3, it is characterised in that：It is described with it is cold Agent room temperature water cooler（5）Oral siphon and unstripped gas room temperature water cooler（16）It is low it to be additionally provided with one on the pipeline of oral siphon connection Warm water tank（2）And low temperature water pump（1）, on the pipeline, before the conveying direction with water at low temperature is, the low temperature water pump（1）Position In low temperature water pot（2）Downstream.
5. based on a kind of liquifying method of the gas liquefaction equipment of band compression recuperation of heat of any one described in claim 1 ~ 3, It is characterized in that：It includes the following steps,
S1：Unstripped gas compression cooling, unstripped gas is through feed gas compressor（3）After supercharging, successively by unstripped gas room temperature water cooler （16）With unstripped gas low temperature water cooler（17）It is cooling, while the heat of compression is taken away by heat transport fluid；
S2：Raw material gas liquefaction, the unstripped gas after being pre-chilled by S1 is through raw material gas purifying unit（18）The wherein easy frozen block of removing or corrosion After property impurity, into gas liquefaction heat exchanger（19）Unstripped gas heat exchanger channels（7）In, in gas liquefaction heat exchanger（19）Middle quilt The precooling of low pressure of backflowing cryogen after liquefying and being subcooled, is re-fed into liquid storage tank or rectifying column；
S3：Refrigerant compression, refrigerant is through refrigerant compressor（4）After supercharging, successively by room temperature water cooler（5）With low temperature water cooling But device（6）It is cooling, while the heat of compression is taken away by heat transport fluid；
S4：Refrigerant liquefaction, the refrigerant after being pre-chilled by S3 enter gas liquefaction heat exchanger（19）High pressure cryogen heat exchanger channels （8）In, in gas liquefaction heat exchanger（19）Middle low pressure cryogen precooling of being backflowed, after liquefying and being subcooled, then through cryogen throttle valve （20）Throttling refrigeration；
S5：Refrigerant re-heat, the low pressure cryogen being throttled in S4 are back to gas liquefaction heat exchanger（19）Low pressure cryogen change The passage of heat（9）In, wherein refrigerant compressor is returned to after the gasification of hot-fluid stock, re-heat to room temperature（4）Entrance, formed one system SAPMAC method；
S6：Heat transport fluid cools down, and the heat transport fluid that the heat of compression is absorbed in S1 and S3 steps enters refrigeration unit（14）Hair Raw side（12）In, it is cooled by water device again after discharging heat（15）Further it is cooled and returned to room temperature water pot（10）In；
S7, normal-temperature water, water at low temperature supply, from room temperature water pot（10）The normal-temperature water come is divided into two strands, one normal-temperature water is through normal-temperature water Pump（11）Unstripped gas room temperature water cooler is sent into after pressurization（16）With refrigerant room temperature water cooler（5）Entrance；Another stock is normal Warm water enters refrigeration unit（14）Evaporation side（13）In, discharging the water at low temperature produced of heat wherein, to be admitted to unstripped gas low Warm water cooler（17）With refrigerant low temperature water cooler（6）Entrance.
6. compressing the liquifying method of the gas liquefaction equipment of recuperation of heat based on a kind of band described in claim 4, it is characterised in that： It includes the following steps,
S1：Unstripped gas compression cooling, unstripped gas is through feed gas compressor（3）After supercharging, successively by unstripped gas room temperature water cooler （16）With unstripped gas low temperature water cooler（17）It is cooling, while the heat of compression is taken away by heat transport fluid；
S2：Raw material gas liquefaction, the unstripped gas after being pre-chilled by S1 is through raw material gas purifying unit（18）The wherein easy frozen block of removing or corrosion After property impurity, into gas liquefaction heat exchanger（19）Unstripped gas heat exchanger channels（7）In, in gas liquefaction heat exchanger（19）Middle quilt The precooling of low pressure of backflowing cryogen after liquefying and being subcooled, is re-fed into liquid storage tank or rectifying column；
S3：Refrigerant compression, refrigerant is through refrigerant compressor（4）After supercharging, successively by room temperature water cooler（5）With low temperature water cooling But device（6）It is cooling, while the heat of compression is taken away by heat transport fluid；
S4：Refrigerant liquefaction, the refrigerant after being pre-chilled by S3 enter gas liquefaction heat exchanger（19）High pressure cryogen heat exchanger channels （8）In, in gas liquefaction heat exchanger（19）Middle low pressure cryogen precooling of being backflowed, after liquefying and being subcooled, then through cryogen throttle valve （20）Throttling refrigeration；
S5：Refrigerant re-heat, the low pressure cryogen being throttled in S4 are back to gas liquefaction heat exchanger（19）Low pressure cryogen change The passage of heat（9）In, wherein refrigerant compressor is returned to after the gasification of hot-fluid stock, re-heat to room temperature（4）Entrance, formed one system SAPMAC method；
S6：Heat transport fluid cools down, and the heat transport fluid that the heat of compression is absorbed in S1 and S3 steps enters refrigeration unit（14）Hair Raw side（12）In, it is cooled by water device again after discharging heat（15）Further it is cooled and returned to room temperature water pot（10）In；
S7, normal-temperature water supply, from room temperature water pot（10）The normal-temperature water come is divided into two strands, the frequent warm water pump of one normal-temperature water（11）Add Unstripped gas room temperature water cooler is sent into after pressure（16）With refrigerant room temperature water cooler（5）Entrance；
S8, water at low temperature are supplied, and another burst of normal-temperature water in S7 enters refrigeration unit（14）Evaporation side（13）In, it discharges wherein The water at low temperature that heat is produced is admitted to low temperature water pot（2）In, low temperature water pot（2）In water at low temperature through low temperature water pump（1）Pressurization Afterwards, it is sent into unstripped gas low temperature water cooler（17）With refrigerant low temperature water cooler（6）Entrance, it is at different levels for reducing compressor Inlet temperature, to reduce compression power consumption.
7. a kind of liquifying method of the gas liquefaction equipment of band compression recuperation of heat according to claim 5 or 6, feature exist In：The operating temperature of high-temperature water after the normal-temperature water, water at low temperature and heat transport fluid heat absorption is respectively 20 ~ 60 DEG C, 5 ~ 30 ℃、100~300℃。
8. a kind of liquifying method of the gas liquefaction equipment of band compression recuperation of heat according to claim 7, it is characterised in that： The unstripped gas is one or more, described refrigerants in oxygen, nitrogen, hydrogen, natural gas liquefaction or liquid space division For air, nitrogen, natural gas, n-formyl sarcolysine alkane it is one or more.
9. a kind of liquifying method of the gas liquefaction equipment of band compression recuperation of heat according to claim 8, it is characterised in that： The feed gas compressor（3）And refrigerant compressor（4）Series be 1 ~ 4 grade or section, grade or it is intersegmental and outlet adopt It is cooled down with normal-temperature water and water at low temperature tandem, the refrigeration unit（14）For lithium bromide absorption refrigerating set or absorption refrigeration With the combination machine of compression-type refrigeration, the water cooler（15）For air-cooled, water-cooling type it is one or more.
10. a kind of liquifying method of the gas liquefaction equipment of band compression recuperation of heat according to claim 9, feature exist In：The heat transport fluid is softened water, desalted water, steam, conduction oil, ethylene glycol or methanol aqueous solution.
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