CN208398412U - Multi-stage compression mixed working medium refrigerating/liquefying system - Google Patents

Multi-stage compression mixed working medium refrigerating/liquefying system Download PDF

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Publication number
CN208398412U
CN208398412U CN201820343634.0U CN201820343634U CN208398412U CN 208398412 U CN208398412 U CN 208398412U CN 201820343634 U CN201820343634 U CN 201820343634U CN 208398412 U CN208398412 U CN 208398412U
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stage
pressure
gas
heat exchanger
grade
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公茂琼
赵延兴
陈高飞
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Technical Institute of Physics and Chemistry of CAS
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Technical Institute of Physics and Chemistry of CAS
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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
    • F25J1/0052—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
    • F25J1/003—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
    • F25J1/0055—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 originating from an incorporated 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
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
    • F25J1/008—Hydrocarbons
    • F25J1/0087—Propane; Propylene
    • 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
    • F25J1/0097—Others, e.g. F-, Cl-, HF-, HClF-, HCl-hydrocarbons etc. or mixtures thereof
    • 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
    • F25J1/0211—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 multi-component refrigerant [MCR] fluid in a closed vapor compression cycle
    • F25J1/0212—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 multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a single flow MCR cycle
    • 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
    • F25J1/0211—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 multi-component refrigerant [MCR] fluid in a closed vapor compression cycle
    • F25J1/0214—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 multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a dual level refrigeration cascade with at least one MCR cycle
    • 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
    • F25J1/0211—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 multi-component refrigerant [MCR] fluid in a closed vapor compression cycle
    • F25J1/0214—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 multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a dual level refrigeration cascade with at least one MCR cycle
    • F25J1/0215—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 multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a dual level refrigeration cascade with at least one MCR cycle with one SCR cycle
    • F25J1/0216—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 multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a dual level refrigeration cascade with at least one MCR cycle with one SCR cycle using a C3 pre-cooling cycle
    • 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.
    • F25J1/0292—Refrigerant compression by cold or cryogenic suction of the refrigerant gas

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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 utility model provides a multistage compression mixed working medium refrigeration/liquefaction system provides a many pressure levels mixed working medium cryrogenic throttle refrigerating system, the liquid phase mixed refrigerant after the preceding stage compression cooling through the separator separation no longer through the back stage compression, reducible whole compression consumption, can reduce cryogenic heat exchanger heat transfer area simultaneously by a wide margin, can realize the matching of heat equivalent in the recuperative heat exchanger and better utilize a plurality of pressure levels that multistage compressor provided, can satisfy various cryogenic demand occasions, such as gas liquefaction, especially natural gas liquefaction, air separation, chemical industry tail gas liquefaction recovery, coal bed gas liquefaction etc.; the utility model provides a multistage compression mixed working medium refrigeration liquefaction system adopts ordinary cold warm district commercial compressor, for traditional high-pressure refrigeration cycle, reduce cost by a wide margin, and for low pressure refrigeration cycle, the utility model provides a multistage compression mixed working medium refrigeration liquefaction system, low temperature level evaporimeter refrigerant pressure improves, and unit refrigerant liquefaction ability is showing the reinforcing.

Description

Multi-stage compression mixed working fluid refrigeration/liquefaction system
Technical field
The utility model relates to Refrigeration & Cryogenic Technique field more particularly to a kind of multi-stage compression mixed working fluid refrigeration/liquid Change system.
Background technique
The energy, chemical industry and cryogenic engineering are widely used in using the Cryogenic mixed-refrigerants j-t refrigerator of backheat measure Field, for realizing the cooling liquefaction etc. with industrial gasses of device, wherein the application in area of natural gas liquefaction is mixing One of most important embodiment of throttling Refrigeration Technique.The use of multicomponent mixture work medium is provided with cryocooler design and operation more More selection freedom degrees.Therefore, for different cooling objects and application requirement, there are various cooling flow systems System only just has no less than tens of kinds of Process flows to occur with liquefied natural gas field.The appearance of these refrigeration systems is to be based on mentioning High efficiency reduces cost and reduces that system complexity etc. is different to be required and propose.And above-mentioned requirements be also new cooling flow not The disconnected motivator occurred.
The common trait of existing mixed working substance copious cooling throttle cooling flow is exactly: utilizing compressor by multicomponent mixture work medium pressure It is reduced to a pressure level, takes away the heat of compression through cooler；The high pressure mixing working medium for being restored to environment temperature enters dividing wall type Heat exchanger is backflowed, and low pressure mixed working fluid is cooling, and subsequently into restricting element realization throttling refrigeration, mixed working fluid pressure itself drops As low as a low-pressure stage, cooling capacity is provided for object to be cooled into evaporator, subsequently into the cooling high pressure incoming flow mixing of heat exchanger Working medium；Own temperature restores to complete a refrigeration cycle close to room temperature into compressor.Above-mentioned circulation continuous carries out Cooling capacity is continuously provided in set temperature.From thermodynamics, mixed working fluid has handled 4 stages in the above process respectively: Compression stage (including condensation heat release), backheat stage, throttling expansion stage and cooling capacity provide the stage.It is required for different application, Each stage may overlap, such as in gas liquefaction stage, and cooling capacity, which provides, is not only the only evaporator in minimum temperature, and It is to be combined with each other with the backheat stage, that is, backflow cryogenic fluid while being that incoming higher pressure working medium and cooled object (such as natural gas) mention Semen donors.Therefore, the prior art is essentially one stage of compression and there are two pressure stages of high pressure and low pressure.
The heat recovery process is really the cooling high-pressure fluid of circularly cooling working medium low-pressure fluid, and high-pressure working medium is made to throttle Preceding temperature reduces, to reduce the process of restriction loss, in this process, cooling capacity is transmitted to high-pressure working medium by low pressure working fluid, and Own temperature restores close to environment temperature.According to low temperature thermodynamic theory, heat recovery process efficiency is to influence refrigeration system always to imitate The key factor of rate.For refrigeration working medium of the same race, in gas phase zone, due to the influence of pressure comparison heat, the specific heat of high-pressure fluid is big In low-pressure fluid specific heat, i.e., heat equivalent of the heat equivalent of high-pressure working medium always greater than low-pressure fluid, therefore backheat under same traffic High and low pressure two sides heat equivalent cannot always match well in heat exchanger, this has resulted in cold and hot two plume in Recuperative heat exchanger The intrinsic upper heat exchange of body heat mechanics mismatches, and causes regenerative losses, this is able to solve by thermal conduction study enhancements Problem.In two-phase section, latent heat of phase change, which has equivalent specific heat, greatly to be contributed, and the phase transformation higher pressure work of identical working medium low-pressure fluid Matter is big, therefore in two-phase section there is a possibility that low-pressure fluid heat equivalent increases.Therefore heat equivalent in Recuperative heat exchanger is solved to mismatch Method there are two types of: the first be by adjusting mixing constituent element, change high-low pressure two sides transition temperature area carry out two side liquid of condition Specific heat is that two side liquids are in two-phase section as far as possible in Recuperative heat exchanger, this needs to increase higher boiling constituent element matched proportion density；Second is Using phase separating measure, high-pressure side fluid flow is reduced, the liquid phase of the high-pressure fluid in two-phase section is separated, gas phase enters Recuperative heat exchanger further cools down, liquid phase then direct throttling expansion, realizes that refrigeration effect enters the cooling gas-phase working medium of low-pressure side (such as Missimer, D.J., US patent 3698202,1972).Above-mentioned two measure is the ratio adjusted in heat equivalent parameter respectively Heat and flow.The critical components such as compressor used by corresponding respective system, above two method can be with by optimization design There is higher thermodynamic efficiency.
But for cryogenic refrigeration area, such as 80K to 120K, increase higher boiling constituent element, which may result in, there is higher boiling constituent element And lubricating oil blocks restricting element.In addition cryogenic refrigeration is realized using single-stage compressor, to improve compressor operational efficiency, subtracted Few pressure ratio improves low pressure, generally requires to add the constituent element of lower boiling such as in mixed working fluid: neon and helium, and helium exists This warm area throttle effect is negative (temperature increases after throttling), the throttle effect very little of neon, more seriously, He-Ne gas No matter both gases are non-condensable gas in high pressure or low-pressure channel, the heat-exchange performance inside the refrigeration system that deteriorates significantly Energy.On the other hand, single-stage compressor due to pressure ratio and power it is restricted, be generally applied in middle-size and small-size system, and In large and medium-sized refrigerating plant, especially natural gas liquid chemical industry mostly uses compound compressor.
In addition, being to realize 210~230K refrigeration in general cold field, recycled frequently with two stages of compression two-stage throttling refrigeration, it is main Syllabus is that compressor pressure ratio is excessive when solving the problems, such as low temperature.In addition circulating with choke twice also occurs in deep cooling field (old Nation of state etc., China Machine Press, 1994), using pure refrigerant, main temperature before reducing afterbody throttling, but last Pressure has already passed through primary throttling before grade throttles, and reduces throttling front and back pressure difference, can reduce the isothermal Joule-Thomoson effect of specific discharge.
Utility model content
Have in view of that, it is necessary to provide a kind of multi-stage compression mixed working fluid refrigeration/liquefaction system, it is intended to solve the prior art The limitation of the application scenarios of the Refrigeration Technique of middle offer and refrigeration liquefying ability is poor.
To achieve the above object, the utility model adopts the following technical solutions:
A kind of multi-stage compression mixed working fluid refrigeration/liquefaction system, comprising: multi-stage compressor unit, backheat unit, evaporator Unit, the high-pressure refrigerant outlet of the multi-stage compressor unit connects the refrigerant high pressure entrance of the backheat unit, described The refrigerant high pressure outlet of backheat unit connects the high pressure entry of the evaporator unit, the low tension outlet of the evaporator unit The refrigerant low-pressure inlet of the backheat unit is connected, the refrigerant low tension outlet of the backheat unit connects the multi-stage compression The low-pressure refrigerant inlet of machine unit；Wherein:
The multi-stage compressor unit includes the first sub- compressor module, the second sub- compressor module ... and N pressure Contracting machine module, N are the natural number more than or equal to 2, and the first sub- compressor module includes first order compressor module, first Grade interstage cooler and first order gas-liquid separator, the second sub- compressor module includes high stage compressor module, second Grade interstage cooler and second level gas-liquid separator, the sub- compressor module of N include N grades of compressor modules, N grades of grades Between cooler and N grades of gas-liquid separators, the high-pressure outlet of the first order compressor module connects first order interstage cooler High pressure entry, the first order interstage cooler high-pressure outlet connection first order gas-liquid separator entrance, described first The liquid-phase outlet of grade gas-liquid separator enters the backheat unit and forms first pressure grade high pressure liquid phase entrance, the first order gas The gaseous phase outlet of liquid/gas separator connects the air entry of the high stage compressor module；The high-pressure outlet of high stage compressor module Connect the high-pressure outlet connection described second of the high pressure entry, the second level interstage cooler of the second level interstage cooler The entrance of grade gas-liquid separator, the liquid-phase outlet of the second level gas-liquid separator enter the backheat unit and form second level height Hydraulic fluid phase entrance, the air entry of the gaseous phase outlet connection next stage compressor module of the second level gas-liquid separator；With such It pushes away, the high pressure entry of the high-pressure outlet connection i-stage interstage cooler of i-stage compressor module, the height of i-stage interstage cooler The entrance of mouth connection i-stage gas-liquid separator is extruded, the liquid-phase outlet of i-stage gas-liquid separator enters the backheat unit and formed I-th pressure stage high pressure liquid phase entrance, the gaseous phase outlet of i-stage gas-liquid separator enter the backheat unit and form the i-th pressure stage High pressure vapor entrance；
The backheat unit includes that main heat exchanger and N number of pressure stage submodule are constituted, the N=1, and 2, i-1, I, N；I-th pressure stage submodule includes: an i-stage restricting element and an i-stage Recuperative heat exchanger, the i-th pressure I-th pressure stage entrance of (i-1)-th grade of Recuperative heat exchanger of outlet connection of grade submodule, the i-th pressure of (i-1)-th grade of Recuperative heat exchanger I-th pressure stage entrance of grade outlet connection next stage pressure stage submodule；N-i grades high indentation in i-stage pressure stage submodule Outlet connection i-stage restricting element mouthful through i-stage Recuperative heat exchanger simultaneously converges with (i-1)-th grade of Recuperative heat exchanger entrance that backflows, I-stage Recuperative heat exchanger is formed into i-stage Recuperative heat exchanger to backflow, and is formed upper level Recuperative heat exchanger and is backflowed entrance；And phase Adjacent 2 grades of Recuperative heat exchanger i-stages and (i-1)-th grade, rear stage Recuperative heat exchanger fewer than the runner of previous stage Recuperative heat exchanger one；
The evaporator unit includes: main restricting element and evaporator, and the outlet of the main heat exchanger of the backheat unit connects The high pressure entry of the main restricting element is connect, the refrigerant inlet of the low tension outlet connection evaporator of the main restricting element steams The refrigerant outlet of hair device connects the entrance of the main heat exchanger of the backheat unit.
It in some preferred embodiments, further include gas liquefaction unit, the gas liquefaction unit includes several gas Liquid knockout drum and its connecting line；
Unstripped gas connects in N stage pressure grade submodule N grade Recuperative heat exchangers into N grades of knockout drums, and N grades The liquid-phase outlet of knockout drum is the liquid phase heavy hydrocarbon of N grades of separation, and the gaseous phase outlet of N grades of gas separate pots connects next stage The unstripped gas entrance of pressure stage submodule, and so on, the 2nd grade of Recuperative heat exchanger enters the 2nd grade in the 2nd stage pressure grade submodule Gas separate pot, the 2nd grade of gas separate pot liquid-phase outlet are the liquid phase heavy hydrocarbon of the 2nd grade of separation, the gas phase of the 2nd grade of gas separate pot The unstripped gas entrance of the 1st stage pressure grade submodule of outlet connection flows directly into evaporator list through the 1st grade of Recuperative heat exchanger pre-cooling Member.
In some preferred embodiments, the interstage cooler is made of sequentially connected cooler and forecooler, institute It states forecooler and provides cooling capacity by pre-cooling module, the pre-cooling module is single compressor steam compression type refrigeration or mixed working fluid system It is cold.
In some preferred embodiments, the i-stage Recuperative heat exchanger has i+3 fluid channel, including i different pressure The high-pressure refrigerant liquid channel of power rank, 1 i-stage high-pressure refrigerant gas phase channel, 1 low pressure refrigerant return gas channel and 1 pre- cold passage of gas liquefaction.
In some preferred embodiments, the i-stage Recuperative heat exchanger has i+2 fluid channel, including i different pressure The high-pressure refrigerant liquid channel of power rank, 1 i-stage high-pressure refrigerant gas phase channel and 1 low pressure refrigerant return gas channel.
In some preferred embodiments, the multi-stage compression unit unit includes 2~6 sub- compressor set modules.
In some preferred embodiments, the BOG of the gas liquefaction unit can be in each Recuperative heat exchanger of backheat unit It backflows and successively recycles.
In some preferred embodiments, the refrigerant is Diversity refrigerant, and the refrigerant is by 7 groups of substance structures At specific as follows:
First group: isopentane, pentane, iso-butane, normal butane, perflenapent, perfluorinated butane, cyclobutane, butylene, 1- fourth Alkene, isobutene, 3-methyl-1-butene, cis-2-butene, R1336mzzZ, or by any two kinds of substances in above-mentioned substance The mixture of composition, or the mixture being made of many kinds of substance in above-mentioned substance, molar concentration range 5~45%；
Second group: propane, propylene, cyclopropane, perfluoropropane, fluoroethane, allene, difluoromethane, 1,1- Difluoroethane, Or the mixture by any two kinds of material compositions in above-mentioned substance, or mixed by what many kinds of substance in above-mentioned substance formed Close object, molar concentration range 5~45%；
Third group: ethane, ethylene, fluoroform, fluomethane, perfluoroethylene, or by any two in above-mentioned substance The mixture of kind material composition, or the mixture being made of many kinds of substance in above-mentioned substance, molar concentration range 5~ 45%；
4th group: tetrafluoromethane, molar concentration range 5~45%；
5th group: methane, molar concentration range 5~45%；
Or mixtures thereof 6th group: nitrogen, argon gas, molar concentration range 10~45%；
7th group: neon, molar concentration range 0~20%.
The utility model by adopting the above technical scheme, can be realized it is following the utility model has the advantages that
Multi-stage compression mixed working fluid refrigeration/liquefaction system provided by the utility model provides a kind of more pressure stage mixing works Matter copious cooling throttle refrigeration system, the liquid phase azeotrope through separator separation after prime compression is cooling are no longer pass through rear class compression, Reduced overall power consumption can be reduced, while low-temperature level heat exchanger heat exchange area can be greatly reduced, can be realized hot in Recuperative heat exchanger The matching of equivalent and the more preferable multiple pressure stages provided using compound compressor, can meet various deep cooling demand occasions, such as gas Liquefaction, especially natural gas liquefaction, air separation, chemical industry tail gas liquefaction recycling, coal gas gasification etc.；It is provided by the utility model Multi-stage compression mixed working fluid refrigeration/liquefaction system, using general cold warm area business compressor, relative to conventional high-tension refrigeration cycle, Cost is greatly reduced, and is recycled relative to low voltage refrigeration, multi-stage compression mixed working fluid refrigeration/liquefaction system provided by the utility model System, low-temperature level evaporator refrigerant pressures improve, and unit cryogen liquefying power significantly increases.
Detailed description of the invention
Fig. 1 multi-stage compressor unit MCU structural schematic diagram provided by the embodiment of the utility model；
The multi-stage compressor unit MCU structural schematic diagram of Fig. 2 band pre-cooling provided by the embodiment of the utility model；
Fig. 3 backheat unit MRU structural schematic diagram provided by the embodiment of the utility model；
Fig. 4 evaporator unit EVU structural schematic diagram provided by the embodiment of the utility model；
Fig. 5 backheat unit MRU provided by the embodiment of the utility model, evaporator unit EVU and liquefaction unit LGU structure are shown It is intended to；
Fig. 6 air cooled two-stage compression mixed working fluid cooling flow provided by the embodiment of the utility model；
The two-stage compression mixed working fluid cooling flow of Fig. 7 band pre-cooling provided by the embodiment of the utility model；
Fig. 8 air cooled three stage compression mixed working fluid cooling flow provided by the embodiment of the utility model；
The three stage compression mixed working fluid cooling flow of Fig. 9 band pre-cooling provided by the embodiment of the utility model.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain The utility model is not used to limit the utility model.
Fig. 1-4 is please referred to, multi-stage compressor unit MCU structural schematic diagram respectively provided by the embodiment of the utility model； The multi-stage compressor unit MCU structural schematic diagram of band pre-cooling provided by the embodiment of the utility model；The utility model embodiment mentions The backheat unit MRU structural schematic diagram and evaporator unit EVU structural schematic diagram provided by the embodiment of the utility model of confession.
Multi-stage compression mixed working fluid refrigeration/liquefaction system provided by the utility model, comprising: multi-stage compressor unit 110, Backheat unit 120, evaporator unit 130.The high-pressure refrigerant outlet of the multi-stage compressor unit 110 connects the backheat list The refrigerant high pressure outlet of the refrigerant high pressure entrance of member 120, the backheat unit 120 connects the evaporator unit 130 High pressure entry, the low tension outlet of the evaporator unit 130 connects the refrigerant low-pressure inlet of the backheat unit 120, described The refrigerant low tension outlet of backheat unit 120 connects the low-pressure refrigerant inlet of the multi-stage compressor unit 110.In detailed below Introduce the specific structure of multi-stage compressor unit 110, backheat unit 120 and evaporator unit 130.
It is multi-stage compressor unit provided by the embodiment of the utility model (MCU) 110 structural schematic diagram referring again to Fig. 1.
The multi-stage compressor unit 110 includes the first sub- compressor module, the second sub- compressor module ... and N Compressor module, N are the natural number more than or equal to 2.
In some preferred embodiments, the multi-stage compression unit unit (MCU) 110 includes 2~6 sub- compressors Group module, therefore respectively correspond 3~7 pressure stages.
The first sub- compressor module includes first order compressor module (CU1), first order interstage cooler (ACC1) With first order gas-liquid separator (MRSP1), the second sub- compressor module includes high stage compressor module (CU2), second Grade interstage cooler (ACC2) and second level gas-liquid separator (MRSP2), the sub- compressor module of N include N grades of compressions The high-pressure outlet of machine module, N grades of interstage coolers and N grades of gas-liquid separators, the first order compressor module (CU1) connects Connect the high-pressure outlet connection the of the high pressure entry of first order interstage cooler (ACC1), the first order interstage cooler (ACC1) The liquid-phase outlet of the entrance of level-one gas-liquid separator (MRSP1), the first order gas-liquid separator (MRSP1) enters the backheat Unit (MRU) 120 forms first pressure grade high pressure liquid phase entrance (LH1), the gas phase of the first order gas-liquid separator (MRSP1) Outlet connects the air entry of the high stage compressor module (CU2)；The high-pressure outlet of high stage compressor module (CU2) connects The high-pressure outlet connection of the high pressure entry, the second level interstage cooler (ACC2) of the second level interstage cooler (ACC2) The liquid-phase outlet of the entrance of the second level gas-liquid separator (MRSP2), the second level gas-liquid separator (MRSP2) enters institute It states backheat unit (MRU) 120 and forms second level high pressure liquid phase entrance (LH2), the gas of the second level gas-liquid separator (MRSP2) The mutually air entry of outlet connection next stage compressor module；And so on, the high-pressure outlet of i-stage compressor module (CUi) connects The high pressure entry of i-stage interstage cooler (ACCi) is connect, the high-pressure outlet of i-stage interstage cooler (ACCi) connects i-stage gas The liquid-phase outlet of the entrance of liquid/gas separator (MRSPi), i-stage gas-liquid separator (MRSPi) enters the backheat unit (MRU) 120 form the i-th pressure stage high pressure liquid phase entrance (LHi), and the gaseous phase outlet of i-stage gas-liquid separator (MRSPi) enters described return Hot cell forms the i-th pressure stage high pressure vapor entrance (GHi).
In some preferred embodiments, the interstage cooler is by sequentially connected cooler (ACC) and forecooler (PRC) it forms, the forecooler (PRC) provides cooling capacity by pre-cooling module, and the pre-cooling module is single compressor steam compression type Refrigeration or mixed working fluid refrigeration.
It is appreciated that multi-stage compressor unit (MCU) 110 is exported according to series difference equipped with different number, for N grades of sons Compressor module (NCU), there is 1 low pressure return air inlet (CUL1), the high-pressure refrigerant liquid-phase outlet of N number of different stage (LH1, LH2, LHN) and 1 N grades of high-pressure refrigerant gaseous phase outlet (GHN).
Referring again to Fig. 2, for the multi-stage compressor unit MCU structural representation of band provided by the embodiment of the utility model pre-cooling Figure.
The difference is that, any one sub- compressor module includes compression with the multi-stage compressor unit MCU that provides in Fig. 1 Machine module (CU), interstage cooler (ACC) and gas-liquid separator (MRSP), the interstage cooler is by sequentially connected cooler It is formed with forecooler, the forecooler provides cooling capacity by pre-cooling module, and the pre-cooling module is single compressor steam compression type system Cold or mixed working fluid refrigeration.The i.e. described first sub- compressor module includes cold between first order compressor module (CU1), first order grade But device (ACC1) and first order gas-liquid separator (MRSP1), the first order interstage cooler (ACC1) is by sequentially connected One cooler (ACC1) and the first forecooler (PRC1) composition, and so on.
Referring to Fig. 3, being the structural schematic diagram of backheat unit (MRU) 120 provided by the embodiment of the utility model.Described time Hot cell 120 includes that main heat exchanger (HX0) and N number of pressure stage submodule are constituted, the N=1, and 2, i-1, I, N；I-th pressure stage submodule includes: an i-stage restricting element (MRVi) and an i-stage Recuperative heat exchanger (HXi), the outlet (HXiLHOi) of the i-th pressure stage submodule connects the i-th pressure stage of (i-1)-th grade of Recuperative heat exchanger (HX [i-1]) Entrance (HX [i-1] LHIi), the i-th pressure stage outlet (HX [i-1] LHOi) connection of (i-1)-th grade of Recuperative heat exchanger (HX [i-1]) The i-th pressure stage entrance (HX [i-2] LHIi) of next stage pressure stage submodule；N-i grades of high pressures in i-stage pressure stage submodule Entrance (HXiLHI [N-i]) through the outlet of i-stage Recuperative heat exchanger (HXi) connects i-stage restricting element (MRVi) and with (i-1)-th Grade Recuperative heat exchanger (HX [i-1]) entrance that backflows (HX [i-1] CUL [i-1]) converges, into i-stage Recuperative heat exchanger (HXi) shape It backflows at i-stage Recuperative heat exchanger (HXi), forms upper level Recuperative heat exchanger and backflow entrance (HXiCULi)；And adjacent 2 grades are returned Heat exchanger i-stage and (i-1)-th grade, rear stage Recuperative heat exchanger fewer than the runner of previous stage Recuperative heat exchanger one.
In some preferred embodiments, the i-stage Recuperative heat exchanger (HXi) has i+3 fluid channel, including i The high-pressure refrigerant liquid channel of different pressures rank, 1 i-stage high-pressure refrigerant gas phase channel, 1 low pressure refrigerant return-air Channel and 1 pre- cold passage of gas liquefaction.
The i-stage Recuperative heat exchanger (HXi) has i+2 fluid channel, the high pressure system including i different pressures rank Cryogen liquid channel, 1 i-stage high-pressure refrigerant gas phase channel and 1 low pressure refrigerant return gas channel.
Referring to Fig. 4, being evaporator unit provided by the embodiment of the utility model (EVU) 130 structural schematic diagram.
The evaporator unit 130 includes: main restricting element (V0) and evaporator (EVAP), the backheat unit 120 The outlet of main heat exchanger (HX0) connects the high pressure entry of the main restricting element (V0), the low pressure of the main restricting element (V0) The refrigerant outlet of the refrigerant inlet of outlet connection evaporator (EVAP), evaporator (EVAP) connects the backheat unit 120 Main heat exchanger (HX0) entrance (HX0CULi).
Referring to Fig. 5, being backheat unit (MRU) 120 provided by the embodiment of the utility model, evaporator unit (EVU) 130 And the structural schematic diagram of liquefaction unit (LGU) 140.
The gas liquefaction unit (LGU) 140 includes several knockout drums and its connecting line；Unstripped gas connection the N grades of Recuperative heat exchangers (HXN) enter N grades of knockout drums (NGSPN), N grades of gas-liquid separations in N stage pressure grade submodule The liquid-phase outlet of tank (NGSPN) is the liquid phase heavy hydrocarbon of N grades of separation, and the gaseous phase outlet of N grades of gas separate pots connects next stage The unstripped gas entrance of pressure stage submodule, and so on, the 2nd grade of Recuperative heat exchanger (HX2) enters in the 2nd stage pressure grade submodule 2nd grade of gas separate pot, the 2nd grade of gas separate pot liquid-phase outlet are the liquid phase heavy hydrocarbon of the 2nd grade of separation, the 2nd grade of gas separate pot Gaseous phase outlet connect the unstripped gas entrance of the 1st stage pressure grade submodule, through the 1st grade of Recuperative heat exchanger (HX1) pre-cooling directly stream Enter evaporator unit 130, it will be understood that form according to liquefied gas, the knockout drum (NGSP) of different series is set.
It is appreciated that cooling capacity can be recycled in the 140 product BOG of gas liquefaction unit (LGU), BOG can be successively in backheat list It backflows in first (MRU) each Recuperative heat exchanger, successively recycles cooling capacity.
In some preferred embodiments, the refrigerant is Diversity refrigerant, and the refrigerant is by 7 groups of substance structures At specific as follows:
First group: isopentane, pentane, iso-butane, normal butane, perflenapent, perfluorinated butane, cyclobutane, butylene, 1- fourth Alkene, isobutene, 3-methyl-1-butene, cis-2-butene, R1336mzzZ, or by any two kinds of substances in above-mentioned substance The mixture of composition, or the mixture being made of many kinds of substance in above-mentioned substance, molar concentration range 5~45%；
Second group: propane, propylene, cyclopropane, perfluoropropane, fluoroethane, allene, difluoromethane, 1,1- Difluoroethane, Or the mixture by any two kinds of material compositions in above-mentioned substance, or mixed by what many kinds of substance in above-mentioned substance formed Close object, molar concentration range 5~45%；
Third group: ethane, ethylene, fluoroform, fluomethane, perfluoroethylene, or by any two in above-mentioned substance The mixture of kind material composition, or the mixture being made of many kinds of substance in above-mentioned substance, molar concentration range 5~ 45%；
4th group: tetrafluoromethane, molar concentration range 5~45%；
5th group: methane, molar concentration range 5~45%；
Or mixtures thereof 6th group: nitrogen, argon gas, molar concentration range 10~45%；
7th group: neon, molar concentration range 0~20%.
Multi-stage compression mixed working fluid refrigeration/liquefaction system provided by the utility model provides a kind of more pressure stage mixing works Matter copious cooling throttle refrigeration system, the liquid phase azeotrope through separator separation after prime compression is cooling are no longer pass through rear class compression, Reduced overall power consumption can be reduced, while low-temperature level heat exchanger heat exchange area can be greatly reduced, can be realized hot in Recuperative heat exchanger The matching of equivalent and the more preferable multiple pressure stages provided using compound compressor, can meet various deep cooling demand occasions, such as gas Liquefaction, especially natural gas liquefaction, air separation, chemical industry tail gas liquefaction recycling, coal gas gasification etc.；It is provided by the utility model Multi-stage compression mixed working fluid refrigeration/liquefaction system, using general cold warm area business compressor, relative to conventional high-tension refrigeration cycle, Cost is greatly reduced, and is recycled relative to low voltage refrigeration, multi-stage compression mixed working fluid refrigeration/liquefaction system provided by the utility model System, low-temperature level evaporator refrigerant pressures improve, and unit cryogen liquefying power significantly increases.
The specific implementation of the utility model is described in detail below in conjunction with specific embodiment:
A kind of embodiment 1: Pyatyi compression mixed working fluid cooling flow of band pre-cooling
Referring to fig. 2,3,4, the backheat pre-cooling unit that three's combination provides a kind of band pre-cooling compresses for the Pyatyi of more heat exchangers Mixed working fluid cooling flow freezes for 65K warm area, and multi-stage compression unit unit (MCU) includes 5 compressor modules, between grade Cooler (ACC) uses air cooling+propane pre-cooling (PRC), and backheat unit (MRU) is made of 5 pressure stage submodules.
Refrigerant is used by 9 kinds of neon, nitrogen, argon gas, methane, tetrafluoromethane, ethane, ethylene, propane, iso-butane group of components At mixed working fluid, 65K cryogenic refrigeration；Environment temperature 300K, mix refrigerant composition and operating pressure parameter are as follows:
A kind of embodiment 2: level Four compression mixed working fluid cooling flow of band pre-cooling
Referring to fig. 2,3,4, the backheat pre-cooling unit that three's combination provides a kind of band pre-cooling compresses for the level Four of more heat exchangers Mixed working fluid cooling flow freezes for 80K warm area, and multi-stage compression unit unit (MCU) includes 4 compressor modules, between grade Cooler (ACC) is using air cooling+mixed working fluid (R290+R152a+CF3I) pre-cooling (PRC), and backheat unit (MRU) is by 4 Pressure stage submodule is constituted.
Refrigerant is used by 9 kinds of neon, nitrogen, argon gas, methane, tetrafluoromethane, ethane, ethylene, propane, iso-butane group of components At mixed working fluid, 80K cryogenic refrigeration；Environment temperature 300K, mix refrigerant composition and operating pressure parameter are as follows:
A kind of embodiment 3: air cooled two-stage compression mixed working fluid liquefaction flow path
Referring to Fig. 6, a kind of cooling two-stage compression mixed working fluid cooling flow of air provided by the utility model is used for 110K Warm area gas liquefaction, multi-stage compression unit unit (MCU) include 2 compressor modules, and interstage cooler (ACC) is cold using air But, backheat unit (MRU) is made of 2 pressure stage submodules, and liquefied gas knockout drum (NGSP) is arranged 2.
Refrigerant is used to be mixed by what 7 kinds of nitrogen, methane, tetrafluoromethane, ethane, propane, iso-butane and isopentane constituent elements formed Working medium is closed, is freezed for natural gas liquefaction system；Unstripped gas is the conventional gas of premenstrual dehydration desulfurization and decarburization, methane content For 90%, heavy hydrocarbons content 8%, remaining content of material 2% (volume fraction), atmospheric boiling point 112K, environment temperature 300K.Mixing Refrigerant composition and operating pressure parameter are as follows:
A kind of embodiment 4: two-stage compression mixed working fluid liquefaction flow path of band pre-cooling
Referring to Fig. 7, a kind of backheat pre-cooling unit of band pre-cooling provided by the utility model is the two-stage compression of more heat exchangers Mixed working fluid cooling flow freezes for 110K warm area, and multi-stage compression unit unit (MCU) includes 2 compressor modules, between grade Cooler (ACC) uses air cooling+propane pre-cooling, and backheat unit (MRU) is made of 2 pressure stage submodules, and BOG gas is cold Amount recycling, liquefied gas knockout drum (NGSP) are arranged 2.
Refrigerant uses the mixing work being made of 7 kinds of neon, nitrogen, methane, tetrafluoromethane, ethylene, propane, iso-butane constituent elements Matter is freezed for natural gas liquefaction system；Unstripped gas is the conventional gas of premenstrual dehydration desulfurization and decarburization, and methane content is 93%, heavy hydrocarbons content 5%, remaining content of material 2% (volume fraction), atmospheric boiling point 112K, environment temperature 300K.Mixing system Cryogen composition and operating pressure parameter are as follows:
A kind of embodiment 5: three stage compression mixed working fluid liquefaction flow path of air precooling
Referring to Fig. 8, a kind of air cooled three stage compression mixed working fluid cooling flow provided by the utility model is used for 110K warm area refrigeration, multi-stage compression unit unit (MCU) include 3 compressor modules, and interstage cooler (ACC) is cold using air But, backheat pre-cooling unit (MRU) is made of 3 pressure stage submodules, BOG gas cold recovery, liquefied gas knockout drum (NGSP) Setting 3.
Refrigerant use by neon, nitrogen, methane, tetrafluoromethane, ethane, ethylene, propane, propylene, iso-butane and The mixed working fluid of 10 kinds of constituent elements of R1336mzzZ composition, freezes for natural gas liquefaction system；Unstripped gas is premenstrual dehydration desulfurization The conventional gas of decarburization, methane content 90%, heavy hydrocarbons content 8%, remaining content of material 2% (volume fraction), often Press boiling point 112K, environment temperature 300K.Mix refrigerant composition and operating pressure parameter are as follows:
A kind of embodiment 6: three stage compression mixed working fluid liquefaction flow path of band pre-cooling
Referring to Fig. 9, a kind of three stage compression mixed working fluid liquefaction flow path of band pre-cooling provided by the utility model is used for 110K Warm area gas liquefaction, multi-stage compression unit unit (MCU) include 3 compressor modules, and interstage cooler (ACC) is cold using air But (PRC) is pre-chilled in+mixed working fluid (R290+R152a+CF3I), and backheat unit (MRU) is made of 3 pressure stage submodules, BOG Gas cold recovery, liquefied gas knockout drum (NGSP) are arranged 2.
Refrigerant uses the mixing work being made of 7 kinds of neon, nitrogen, methane, tetrafluoromethane, ethylene, propane, iso-butane constituent elements Matter is freezed for natural gas liquefaction system；Unstripped gas is the conventional gas of premenstrual dehydration desulfurization and decarburization, and methane content is 93.0%, heavy hydrocarbons content 5%, remaining content of material 2% (volume fraction), atmospheric boiling point 112K, environment temperature 300K.Mixing Refrigerant composition and operating pressure parameter are as follows:
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model Protection scope within.

Claims (7)

1. a kind of multi-stage compression mixed working fluid refrigeration/liquefaction system characterized by comprising multi-stage compressor unit, backheat list Member, evaporator unit, the high-pressure refrigerant outlet of the multi-stage compressor unit connect the refrigerant high pressure of the backheat unit Entrance, the refrigerant high pressure outlet of the backheat unit connect the high pressure entry of the evaporator unit, the evaporator unit Low tension outlet connect the refrigerant low-pressure inlet of the backheat unit, the refrigerant low tension outlet of the backheat unit connects institute State the low-pressure refrigerant inlet of multi-stage compressor unit；Wherein:
The multi-stage compressor unit includes the first sub- compressor module, the second sub- compressor module ... and the sub- compressor of N Module, N are the natural number more than or equal to 2, and the first sub- compressor module includes first order compressor module, first order grade Between cooler and first order gas-liquid separator, the second sub- compressor module include high stage compressor module, the second level grade Between cooler and second level gas-liquid separator, the sub- compressor module of N include it is cold between N grades of compressor modules, N grades of grades But device and N grades of gas-liquid separators, the height of the high-pressure outlet connection first order interstage cooler of the first order compressor module Be pressed into mouth, the first order interstage cooler high-pressure outlet connection first order gas-liquid separator entrance, the first order gas The liquid-phase outlet of liquid/gas separator enters the backheat unit and forms first pressure grade high pressure liquid phase entrance, the first order gas-liquid point From the air entry that the gaseous phase outlet of device connects the high stage compressor module；The high-pressure outlet of high stage compressor module connects The high-pressure outlet connection second level gas of the high pressure entry of the second level interstage cooler, the second level interstage cooler The entrance of liquid/gas separator, the liquid-phase outlet of the second level gas-liquid separator enter the backheat unit and form second level high pressure liquid Phase entrance, the air entry of the gaseous phase outlet connection next stage compressor module of the second level gas-liquid separator；And so on, the The high pressure entry of the high-pressure outlet connection i-stage interstage cooler of i grades of compressor modules, the high of i-stage interstage cooler extrude The entrance of mouth connection i-stage gas-liquid separator, the liquid-phase outlet of i-stage gas-liquid separator enter the backheat unit and form i-th Pressure stage high pressure liquid phase entrance, the gaseous phase outlet of i-stage gas-liquid separator enter the backheat unit and form the i-th pressure stage high pressure Gas phase entrance；
The backheat unit includes that main heat exchanger and N number of pressure stage submodule are constituted, the N=1, and 2, i-1, I, N；I-th pressure stage submodule includes: an i-stage restricting element and an i-stage Recuperative heat exchanger, the i-th pressure I-th pressure stage entrance of (i-1)-th grade of Recuperative heat exchanger of outlet connection of grade submodule, the i-th pressure of (i-1)-th grade of Recuperative heat exchanger I-th pressure stage entrance of grade outlet connection next stage pressure stage submodule；N-i grades high indentation in i-stage pressure stage submodule Outlet connection i-stage restricting element mouthful through i-stage Recuperative heat exchanger simultaneously converges with (i-1)-th grade of Recuperative heat exchanger entrance that backflows, I-stage Recuperative heat exchanger is formed into i-stage Recuperative heat exchanger to backflow, and is formed upper level Recuperative heat exchanger and is backflowed entrance；And phase Adjacent 2 grades of Recuperative heat exchanger i-stages and (i-1)-th grade, rear stage Recuperative heat exchanger fewer than the runner of previous stage Recuperative heat exchanger one；
The evaporator unit includes: main restricting element and evaporator, and the outlet of the main heat exchanger of the backheat unit connects institute State the high pressure entry of main restricting element, the refrigerant inlet of the low tension outlet connection evaporator of the main restricting element, evaporator Refrigerant outlet connect the backheat unit main heat exchanger entrance.
2. multi-stage compression mixed working fluid refrigeration/liquefaction system according to claim 1, which is characterized in that further include gas Liquefaction unit, the gas liquefaction unit include several knockout drums and its connecting line；
Unstripped gas connects N grades of Recuperative heat exchangers in N stage pressure grade submodule and enters N grades of knockout drums, N grades of gas-liquids The liquid-phase outlet of knockout drum is the liquid phase heavy hydrocarbon of N grades of separation, and the gaseous phase outlet of N grades of gas separate pots connects next stage pressure The unstripped gas entrance of grade submodule, and so on, the 2nd grade of Recuperative heat exchanger enters the 2nd grade of gas in the 2nd stage pressure grade submodule Knockout drum, the 2nd grade of gas separate pot liquid-phase outlet are the liquid phase heavy hydrocarbon of the 2nd grade of separation, the gaseous phase outlet of the 2nd grade of gas separate pot The unstripped gas entrance for connecting the 1st stage pressure grade submodule flows directly into evaporator unit through the 1st grade of Recuperative heat exchanger pre-cooling.
3. multi-stage compression mixed working fluid refrigeration/liquefaction system according to claim 1, which is characterized in that cold between the grade But device is made of sequentially connected cooler and forecooler, and the forecooler provides cooling capacity, the pre-cooling module by pre-cooling module Freeze for single compressor steam compression type refrigeration or mixed working fluid.
4. multi-stage compression mixed working fluid refrigeration/liquefaction system according to claim 1, which is characterized in that the i-stage is returned Heat exchanger has i+3 fluid channel, the high-pressure refrigerant liquid channel including i different pressures rank, 1 i-stage high pressure Refrigerant gas phase channel, 1 low pressure refrigerant return gas channel and 1 pre- cold passage of gas liquefaction.
5. multi-stage compression mixed working fluid refrigeration/liquefaction system according to claim 1, which is characterized in that the i-stage is returned Heat exchanger has i+2 fluid channel, the high-pressure refrigerant liquid channel including i different pressures rank, 1 i-stage high pressure Refrigerant gas phase channel and 1 low pressure refrigerant return gas channel.
6. multi-stage compression mixed working fluid refrigeration/liquefaction system according to claim 1, which is characterized in that the multistage pressure Contracting train unit includes 2~6 sub- compressor set modules.
7. multi-stage compression mixed working fluid refrigeration/liquefaction system according to claim 2, which is characterized in that the gas liquid The BOG for changing unit can backflow in each Recuperative heat exchanger of backheat unit successively to be recycled.
CN201820343634.0U 2018-03-13 2018-03-13 Multi-stage compression mixed working medium refrigerating/liquefying system Active CN208398412U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108489133A (en) * 2018-03-13 2018-09-04 中国科学院理化技术研究所 Multi-stage compression mixed working medium refrigerating/liquefying system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108489133A (en) * 2018-03-13 2018-09-04 中国科学院理化技术研究所 Multi-stage compression mixed working medium refrigerating/liquefying system
CN108489133B (en) * 2018-03-13 2023-10-20 中国科学院理化技术研究所 Multi-stage compression mixed working medium refrigerating/liquefying system

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