CN109405414A - Liquid space division device - Google Patents

Liquid space division device Download PDF

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Publication number
CN109405414A
CN109405414A CN201811423338.2A CN201811423338A CN109405414A CN 109405414 A CN109405414 A CN 109405414A CN 201811423338 A CN201811423338 A CN 201811423338A CN 109405414 A CN109405414 A CN 109405414A
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China
Prior art keywords
air
nitrogen
liquid
rectifying column
space division
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CN201811423338.2A
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Chinese (zh)
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薛鲁
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Individual
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Individual
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Priority to CN201811423338.2A priority Critical patent/CN109405414A/en
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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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04793—Rectification, e.g. columns; Reboiler-condenser
    • 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F25J3/0423—Subcooling of liquid process streams
    • 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
    • F25J3/04296—Claude expansion, i.e. expanded into the main or high pressure column
    • 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04333—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/04339—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of air
    • F25J3/04345—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of air and comprising a gas work expansion 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
    • F25J3/04393—Details relating to the work expansion, e.g. process parameter etc. using multiple or multistage gas work expansion
    • 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04406—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
    • F25J3/04412—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
    • 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04642—Recovering noble gases from air
    • F25J3/04648—Recovering noble gases from air argon
    • F25J3/04654—Producing crude argon in a crude argon column
    • F25J3/04666—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system
    • F25J3/04672—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system having a top condenser
    • F25J3/04678—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system having a top condenser cooled by oxygen enriched liquid from high pressure column bottoms
    • 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
    • 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
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/50—Processes or apparatus using separation by rectification using multiple (re-)boiler-condensers at different heights of the column
    • F25J2200/52—Processes or apparatus using separation by rectification using multiple (re-)boiler-condensers at different heights of the column in the high pressure column of a double pressure main column system
    • 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
    • F25J2230/42—Processes or apparatus involving steps for increasing the pressure of gaseous process streams the fluid being 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/42—Processes or apparatus involving steps for recycling of process streams the recycled stream being 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
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/02—Internal refrigeration with liquid vaporising loop

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The present invention relates to a kind of liquid space division devices, including rectifying column, air refrigeration cycle system and nitrogen cycle system；Air refrigeration cycle system includes the raw material air compressor machine, circulation air supercharger, supercharging air turbo-expander that rectifying column is then connected to after being sequentially connected by pipeline, further includes the air circulation heat exchanger for realizing air heat exchange；Nitrogen cycle system includes the nitrogen compressor connected by pipeline, the reboiler for being passed through the oxygen-enriched liquid air that rectifying column generates, at least one branch of the nitrogen outlet institute connecting pipe of rectifying column is connected to reboiler after nitrogen compressor, and the liquid nitrogen of reboiler, which is exported, is connected at least one of rectifying column, gas-liquid separator, pure argon column system three by pipeline.Starting process of the present invention is simple, gas passage displacement blows down that the time is short, and equipment investment is less, and liquid product yield is guaranteed, good operation stability, and the unit power consumption of liquid product decreases when starting.

Description

Liquid space division device
Technical field
The present invention relates to a kind of upper specification, (liquid product total amount is greater than 3000Nm3/ h) and liquid nitrogen production more than liquid space division Device.
Background technique
In the prior art, the liquid space division device of upper specification is generally using the dress for having high and low temperature booster expansion turbine It sets and process flow.There are two types of refrigeration cycle for this device and process flow.One is air circulation, main mating machine includes Raw material air compressor machine, circulation air supercharger, high temperature air booster expansion turbine and Cryogenic air booster expansion turbine.It is another Kind is nitrogen circulation, and main mating machine includes raw material air compressor machine, low pressure nitrogen compressor, circulating nitrogen gas supercharger, high temperature nitrogen increasing Press turbo-expander and low temperature nitrogen booster expansion turbine.The advantages of air circulation liquid space division device be mating machine it is few, Start simple and convenient, investment relatively saves, the disadvantage is that liquid nitrogen production is limited, to be generally less than liquid oxygen yield, and more in liquid nitrogen production When Argon recovery rate it is lower, liquid argon yield reduce.Then liquid nitrogen production is unrestricted for nitrogen circulation liquid space division device, can be greater than liquid oxygen Yield, even up to 2.3 ~ 2.5 of liquid oxygen yield times or more, and liquid argon recovery rate and liquid argon yield are substantially unaffected, and are lacked Point is that device starting process is complex, and it is long to blow down the time for channel of nitrogen gas displacement when starting, and plant investment is more, equipment Operation stability is poor.
Summary of the invention
The advantages of having both both air circulation and nitrogen circulation the object of the present invention is to provide one kind avoids the two disadvantage, It eliminates that starting process is complicated, channel of nitrogen displacement blows down that the time is long, the disadvantage more than plant investment when starting, and guarantees that product produces The upper specification of amount, liquid nitrogen production is more, liquid space division device of good operation stability.
In order to achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of liquid space division device, including rectifying column, air refrigeration cycle system and nitrogen cycle system；
The air refrigeration cycle system include the raw material air compressor machine that the rectifying column is then connected to after being sequentially connected by pipeline, Circulation air supercharger, supercharging air turbo-expander further include the air circulation heat exchanger for realizing air heat exchange；
The nitrogen cycle system includes the nitrogen compressor connected by pipeline, is passed through boiling again for the oxygen-enriched liquid air that the rectifying column generates Device, at least one branch of the nitrogen outlet institute connecting pipe of the rectifying column is connected to after the nitrogen compressor described boils again The liquid nitrogen outlet of device, the reboiler is connected to the rectifying column, gas-liquid separator by pipeline, in pure argon column system three At least one.
Preferably, the liquid space division device further includes several for realizing nitrogen heat exchange in the nitrogen cycle system Nitrogen cycle heat exchanger.
Preferably, the air circulation heat exchanger and the nitrogen cycle heat exchanger are integrated into a main heat exchanger.
Preferably, main condenser evaporator, the main condenser evaporator are provided between the Shang Ta of the rectifying column and lower tower Liquid nitrogen export at least one of the rectifying column, gas-liquid separator, pure argon column system three be connected to by pipeline.
Preferably, the liquid space division device further includes that several are subcooled for realizing liquid nitrogen in the nitrogen cycle system Main subcooler.
Preferably, the liquid nitrogen of the reboiler exports connected pipeline and is then connected to institute after the main subcooler State at least one of rectifying column, gas-liquid separator, pure argon column system three.
Preferably, the nitrogen compressor is low pressure nitrogen compressor or medium pressure nitrogen press.
Preferably, the reboiler is set to the lower tower bottom of the rectifying column or by under pipeline and the rectifying column Tower is connected.
Preferably, the supercharging air turbo-expander is single expanding machine or the supercharging air turbo-expander is Single expanding machine with pre-cooler or the supercharging air turbo-expander be include high temperature air booster expansion turbine and Double expanding machines of Cryogenic air booster expansion turbine.
Between the circulation air supercharger and the supercharging air turbo-expander, the supercharging air turbo-expander Cooler is provided between the rectifying column.
Due to the above technical solutions, the present invention has the following advantages over the prior art: present invention preserves existing It the advantages of some air circulations and nitrogen circulation, both solves the disadvantage that, starting process is simple, gas passage is set when starting It changes and blows down that the time is short, and equipment investment is less, liquid product yield is able to guarantee, stable, and the unit power consumption of liquid product It decreases, liquid space division device that be the new upper specification of one kind, that liquid nitrogen production is more.
Detailed description of the invention
Attached drawing 1 is the schematic diagram of liquid space division device of the invention.
In the figures above: 1, nitrogen compressor；2, circulation air supercharger；3, cooler；4, high temperature air turbine boosting expands Machine；5, cooler；6, Cryogenic air booster expansion turbine；7, cooler；8, main heat exchanger；9, subcooler；10, gas-liquid separation Device；11, main subcooler；12, upper tower；13, main condenser evaporator；14, lower tower；15, reboiler；16, condenser of crude argon tower；17, Crude argon column.
Specific embodiment
The invention will be further described for embodiment shown in reference to the accompanying drawing.
Embodiment one: as shown in Fig. 1, a kind of liquid space division device, including rectifying column, air refrigeration cycle system and nitrogen The circulatory system.
Rectifying column includes upper tower 12 and lower tower 14, and is provided with main condenser evaporator 13 between upper tower 12 and lower tower 14.Essence Evaporating tower can connect pure argon column system, Crude argon column system etc..Such as Crude argon column system shown in Fig. 1, it includes crude argon column 17, The top of crude argon column 17 is provided with condenser of crude argon tower 16, is connected with pure argon column system (not shown in figure 1).
Air refrigeration cycle system includes passing through the sequentially connected raw material air compressor machine (not shown) of pipeline, circulation air Supercharger 2, supercharging air turbo-expander, are then then connected to rectifying column, air refrigeration cycle system further include for realizing The air circulation heat exchanger of air heat exchange, air circulation heat exchanger are a part of main heat exchanger 8.Specifically, supercharging air Turbo-expander is that perhaps supercharging air turbo-expander is that single expanding machine with pre-cooler or air increase to single expanding machine Pressure turbo-expander is the double expanding machines for including high temperature air turbine boosting expansion 4 machines and Cryogenic air booster expansion turbine 6. The third scheme is used in the present embodiment, i.e. supercharging air turbo-expander includes the high temperature air turbine boosting expansion being connected in series Machine 4 and Cryogenic air booster expansion turbine 6.Between circulation air supercharger 2 and supercharging air turbo-expander, supercharging air Between turbo-expander and rectifying column (including high temperature air booster expansion turbine 4 and Cryogenic air booster expansion turbine 6 it Between) it is provided with cooler, respectively cooler 3, cooler 5, cooler 7.
Raw air comes from raw material air compressor machine, after nitrogen-water chilldown system and purification system processing, is sent into circulation air Supercharger 2 is pressurized.The air of circulation air supercharger 2 is successively divided into two-way after subcooler 3 out, all the way successively through height Pressurized end, cooler 5, the pressurized end of Cryogenic air booster expansion turbine 6, cooler of warm air booster expansion turbine 4 7, air circulation heat exchanger (i.e. main heat exchanger 8), another way increase through air circulation heat exchanger (i.e. main heat exchanger 8), high temperature air After the expanding end for pressing turbo-expander 4, circulation air supercharger 2 is sent into together with raw air.The air of cooler 7 is in sky out It is further divided into two-way in gas circulation heat exchanger (i.e. main heat exchanger 8), all the way after the expanding end of Cryogenic air booster expansion turbine 6 Circulation air supercharger 2 is sent into together with raw air after air circulation heat exchanger (i.e. main heat exchanger 8) again, another way is direct It is sent into lower tower 14 and carries out rectifying.
Nitrogen cycle system includes nitrogen compressor 1, the reboiler 15 connected by pipeline, further includes that several are followed for realizing nitrogen The nitrogen cycle heat exchanger of nitrogen heat exchange in loop system, several main subcoolers being subcooled for realizing liquid nitrogen in nitrogen cycle system 11.Air circulation heat exchanger and nitrogen cycle heat exchanger can be respectively independent, can also be integrated.In the present embodiment, air circulation Heat exchanger and nitrogen cycle heat exchanger are integrated into a main heat exchanger 8.Then at least the one of the nitrogen outlet institute connecting pipe of rectifying column A branch is connected to reboiler 15 after nitrogen compressor 1, i.e. nitrogen outlet institute's connecting pipe of rectifying column is changed through main subcooler 11, master After hot device 8, it is divided into Liang Ge branch, a branch exports low-pressure nitrogen, another branch is then after nitrogen compressor 1, using master Heat exchanger 8 or main subcooler 11 and be connected to reboiler 15, so that a part of nitrogen is pressurized to certain pressure in nitrogen compressor 1 Afterwards, it is admitted in reboiler 15 after certain temperature is as cold as in main heat exchanger 8.The oxygen-enriched of rectifying column generation is passed through in reboiler 15 Liquid air, in reboiler 15, the part nitrogen and oxygen-enriched liquid air exchange heat, and return lower tower 14 after so that oxygen-enriched liquid air is flashed to gas again and join With rectifying, nitrogen is then condensed into liquid nitrogen.The liquid nitrogen of reboiler 15 exports connected pipeline and connects again after main subcooler 11 It is connected at least one of rectifying column, gas-liquid separator 10, pure argon column system three.Main condenser evaporator 13 also goes out with liquid nitrogen Mouthful, at least one of rectifying column, gas-liquid separator 10, pure argon column system three are connected to also by pipeline.In this implementation In example, the liquid nitrogen outlet of reboiler 15 is connected to liquid nitrogen gas-liquid separator 10 after main subcooler 11, thus this part nitrogen Enter gas-liquid separator 10 after being subcooled in main subcooler 11；And main subcooler 11 is passed through in the liquid nitrogen outlet of main condenser evaporator 13 After be divided into three tunnels, warp knuckle is streamed to going at the top of the upper tower 12 of rectifying column to participate in rectifying all the way, is sent after throttling all the way to pure argon column System is sent into gas-liquid separator 10 after reducing pressure by regulating flow all the way.Separated in gas-liquid separator 10 to liquid submitting become The nitrogen of liquid nitrogen product, gas and tower 12 on rectifying column out collaborates.
In the above scheme, nitrogen compressor 1 is low pressure nitrogen compressor or medium pressure nitrogen press, and the capacity of nitrogen compressor 1 depends on institute It is required that liquid nitrogen production.Reboiler 15 is set to 14 bottom of lower tower of rectifying column or is connected by pipeline with the lower tower 14 of rectifying column It connects.
It can be by master in addition, the oxygen-enriched liquid air of the lower tower 14 of rectifying column exports, liquid nitrogen fraction exports connected pipeline Subcooler 11 keeps the oxygen-enriched liquid air for obtaining lower tower 14 and liquid nitrogen fraction and the liquid nitrogen of main condenser evaporator 13 and reboiler 15 out common It is subcooled in a main subcooler 11, can also separate and be subcooled in two different main subcoolers.The liquid oxygen of rectifying column exports It can be connected by pipeline and pass through main subcooler 11, can also be subcooled in ad hoc subcooler with liquid nitrogen, for example, main condenser In addition the connected pipeline in the liquid nitrogen outlet of evaporator 13 can also separate again is used for liquid oxygen after throttling in subcooler 9 all the way Supercooling.
The operation process and conventional band high/low temperature that liquid space division device more than above-mentioned upper specification, liquid nitrogen production uses are swollen The operation process of swollen machine air refrigeration cycle liquid space division device is substantially identical.First according to band high/low temperature expander air system The requirement starting air cooling cycle system and rectifying column of SAPMAC method liquid space division device are run, until setting up normal rectifying Operating condition, rectifying column produce the low-pressure nitrogen that qualified liquid oxygen product, liquid nitrogen product and purity reach requirement.Due to liquid nitrogen at this time Yield also not up to require, therefore circulation air supercharger 2, supercharging air turbo-expander (including high temperature air turbine boosting expansion Machine 4 and Cryogenic air booster expansion turbine 6) decrement operation.After the purity of the low-pressure nitrogen of main heat exchanger 8 out is up to standard, rise Dynamic nitrogen compressor 1 and the capacity for being stepped up nitrogen compressor 1 from less to more, make this strand of nitrogen drop to regulation temperature in main heat exchanger 8 The reboiler 15 for entering lower tower 14 after degree, is condensed into liquid nitrogen wherein.At the same time, by circulation air supercharger 2, high temperature air Gradually increment is run until reaching defined working condition requirement for booster expansion turbine 4 and Cryogenic air booster expansion turbine 6.
The liquid space division device of above scheme can simplify starting process, shorten the starting time, reduce plant investment, reduce The unit power consumption of liquid product has apparent economic benefit.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.

Claims (10)

1. a kind of liquid space division device, including rectifying column, it is characterised in that: the liquid space division device further includes that air cooling follows Loop system and nitrogen cycle system；
The air refrigeration cycle system include the raw material air compressor machine that the rectifying column is then connected to after being sequentially connected by pipeline, Circulation air supercharger, supercharging air turbo-expander further include the air circulation heat exchanger for realizing air heat exchange；
The nitrogen cycle system includes the nitrogen compressor connected by pipeline, is passed through boiling again for the oxygen-enriched liquid air that the rectifying column generates Device, at least one branch of the nitrogen outlet institute connecting pipe of the rectifying column is connected to after the nitrogen compressor described boils again The liquid nitrogen outlet of device, the reboiler is connected to the rectifying column, gas-liquid separator by pipeline, in pure argon column system three At least one.
2. liquid space division device according to claim 1, it is characterised in that: the liquid space division device further includes several For realizing the nitrogen cycle heat exchanger of nitrogen heat exchange in the nitrogen cycle system.
3. liquid space division device according to claim 2, it is characterised in that: the air circulation heat exchanger and the nitrogen follow Ring heat exchanger is integrated into a main heat exchanger.
4. liquid space division device according to claim 1, it is characterised in that: set between the Shang Ta of the rectifying column and lower tower It is equipped with main condenser evaporator, the liquid nitrogen of the main condenser evaporator, which is exported, is connected to the rectifying column, gas-liquid separation by pipeline At least one of device, pure argon column system three.
5. liquid space division device according to claim 1, it is characterised in that: the liquid space division device further includes several The main subcooler being subcooled for realizing liquid nitrogen in the nitrogen cycle system.
6. liquid space division device according to claim 5, it is characterised in that: what the liquid nitrogen outlet of the reboiler was connected Pipeline be then connected to after the main subcooler rectifying column, gas-liquid separator, in pure argon column system three at least One.
7. liquid space division device according to claim 1, it is characterised in that: the nitrogen compressor is low pressure nitrogen compressor or middle pressure Nitrogen compressor.
8. liquid space division device according to claim 1, it is characterised in that: the reboiler is set to the rectifying column Lower tower bottom is connected by pipeline with the lower tower of the rectifying column.
9. liquid space division device according to claim 1, it is characterised in that: the supercharging air turbo-expander is single swollen Perhaps the supercharging air turbo-expander is that single expanding machine with pre-cooler or the supercharging air turbine are swollen to swollen machine Swollen machine is the double expanding machines for including high temperature air booster expansion turbine and Cryogenic air booster expansion turbine.
10. liquid space division device according to claim 1, it is characterised in that: the circulation air supercharger and the sky Cooler is provided between gas booster expansion turbine, between the supercharging air turbo-expander and the rectifying column.
CN201811423338.2A 2018-11-27 2018-11-27 Liquid space division device Pending CN109405414A (en)

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Cited By (1)

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WO2021179980A1 (en) * 2020-03-11 2021-09-16 苏州市兴鲁空分设备科技发展有限公司 Fully-liquefied gas separation equipment and process

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JP2013007512A (en) * 2011-06-23 2013-01-10 Air Water Inc Air separation method and air separator
CN108731379A (en) * 2018-07-24 2018-11-02 杭州杭氧股份有限公司 A kind of amount of liquid is adjustable and produces the air separation plant and production method of more specification oxygen products simultaneously
CN209085176U (en) * 2018-11-27 2019-07-09 薛鲁 Liquid space division device

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Publication number Priority date Publication date Assignee Title
US4777803A (en) * 1986-12-24 1988-10-18 Erickson Donald C Air partial expansion refrigeration for cryogenic air separation
CN201265997Y (en) * 2008-09-05 2009-07-01 苏州制氧机有限责任公司 Liquid air separation plant
JP2013007512A (en) * 2011-06-23 2013-01-10 Air Water Inc Air separation method and air separator
CN108731379A (en) * 2018-07-24 2018-11-02 杭州杭氧股份有限公司 A kind of amount of liquid is adjustable and produces the air separation plant and production method of more specification oxygen products simultaneously
CN209085176U (en) * 2018-11-27 2019-07-09 薛鲁 Liquid space division device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021179980A1 (en) * 2020-03-11 2021-09-16 苏州市兴鲁空分设备科技发展有限公司 Fully-liquefied gas separation equipment and process

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