CN106091575A - A kind of expanded air bypass amount being matched in external compression space division reduces device and reduction method - Google Patents

A kind of expanded air bypass amount being matched in external compression space division reduces device and reduction method Download PDF

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Publication number
CN106091575A
CN106091575A CN201610376127.2A CN201610376127A CN106091575A CN 106091575 A CN106091575 A CN 106091575A CN 201610376127 A CN201610376127 A CN 201610376127A CN 106091575 A CN106091575 A CN 106091575A
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liquid nitrogen
tower
expanded air
space division
air bypass
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CN106091575B (en
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尹必军
王健
焦迟林
林杰辉
韦霆
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Yingde Gas Engineering Zhejiang Co ltd
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Zhejiang Zhihai Chemical Equipment Engineering Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • 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
    • 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
    • F25J3/04254—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using the cold stored in external cryogenic fluids
    • 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
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • 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
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04048—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams
    • F25J3/0406—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams of 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
    • 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
    • F25J3/04303—Lachmann expansion, i.e. expanded into oxygen producing or low 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
    • F25J3/04763—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
    • F25J3/04781—Pressure changing devices, e.g. for compression, expansion, liquid pumping
    • 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
    • F25J3/04763—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
    • F25J3/048—Argon recovery
    • 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
    • F25J3/04812—Different modes, i.e. "runs" of operation
    • F25J3/04818—Start-up of the process
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/42—Nitrogen
    • 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
    • F25J2245/40—Processes or apparatus involving steps for recycling of process streams the recycled stream being air
    • 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

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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

A kind of expanded air bypass amount being matched in external compression space division reduces device and reduction method, it includes the upper tower of an external compression space division rectifying column, one liquid nitrogen storage, the bottom of liquid nitrogen storage by be serially connected with low temperature liquid nitrogen pump and return tower liquid nitrogen regulation valve the tower liquid nitrogen pipeline that returns be connected to upper tower；Accessing tap on expanded air pipeline at upper tower has a road to be serially connected with the expanded air bypass line of expanded air bypass valve V3；Described method includes: a, carry out flow scheme design and installation and debugging；B, space division start normal, stable conditions；It is adapted, if expanded air can not fully enter tower, enters next step；C, return tower all devices facility all carry out startup before preparation；D, startup low temperature liquid nitrogen pump, infinite reflux；The present invention enters upper tower, tower rectification potentiality in raising by being supplemented by liquid nitrogen in storage tank, such that it is able to increase bypath air to enter the flow of upper tower.

Description

A kind of expanded air bypass amount being matched in external compression space division reduces device and reduction Method
Technical field
The present invention relates to a kind of expanded air bypass amount being matched in external compression space division and reduce device and reduction method, It is applicable to external compression space division bypath air and can not fully enter the situation of tower, belong to space division technical field of rectification.
Background technology
Air is the raw material of air separation unit, and in external compression space division flow process, expanded air can only enter owing to pressure is relatively low Upper tower, but owing to the backflow of upper tower is smaller, if expanded air fully enters tower, oxygen Argon recovery rate can be affected, and operating mode is not Surely, therefore, it will usually be ultimately discharged into air after some expanded air bypass, cause the waste of raw material.
Summary of the invention
It is an object of the invention to the deficiency overcoming prior art to exist, and provide a kind of structure composition rationally, flow process letter Single, use easy to operate, safe and reliable, can effectively reduce expanded air bypass amount, avoid outside being matched in of wastage of material as far as possible The expanded air bypass amount of compression space division reduces device and reduces method.
It is an object of the invention to complete by following technical solution: a kind of expanded air being matched in external compression space division Bypass amount reduces device, and it includes the upper tower of an external compression space division rectifying column, a liquid nitrogen storage, the bottom of described liquid nitrogen storage By be serially connected with low temperature liquid nitrogen pump and return tower liquid nitrogen regulation valve the tower liquid nitrogen pipeline that returns be connected to upper tower；Access at upper tower and expand On air pipe line, tap has a road to be serially connected with the expanded air bypass line of expanded air bypass valve.
As preferably: the tap on tower liquid nitrogen pipeline of returning of described low temperature liquid nitrogen pump discharge has a road to be serially connected with backflow regulation Valve, for controlling the reflux pipe of low temperature liquid nitrogen pump discharge pressure；Described low temperature liquid nitrogen pump is by being controlled by the low of variable frequency adjustment device Temperature liquid nitrogen pump driven by motor；Described return tower liquid nitrogen pipeline and lower tower liquid nitrogen runner and connect after together be connected to upper tower；Described return tower liquid Nitrogen pipeline is also equipped with the effusion meter for connecting variable frequency adjustment device.
A kind of the above-mentioned expanded air bypass amount being matched in external compression space division is utilized to reduce device to reduce by expanded air The method of flux, the method includes:
A, carry out flow scheme design, engineering design and installation and debugging；
B, space division start normal, stable conditions；It is adapted, if expanded air can not fully enter tower, then enters next step；
C, return tower all devices facility all carry out startup before preparation；
D, startup low temperature liquid nitrogen pump, infinite reflux；
E, slowly open return tower liquid nitrogen regulation valve, step up FIC1；Turn down expanded air bypass valve, reduce FIC2, FIC2 fall Low amounts/FIC1 is fixed numbers, regulates other relevant parameters simultaneously, to guarantee rectifying column rectification stable conditions；
F, air to be expanded bypass valve are fully closed, and after stable conditions；In conjunction with regulating working conditions, gradually reduce FIC1, will not reduce On the premise of oxygen Argon recovery rate and stable conditions, find minimum FIC1.
According to Theoretical Calculation, upper tower enter 1t/h liquid nitrogen can output about 1t/h liquid oxygen, rectification potentiality can increase 1600Nm/h Above ascending air, thus the oxygen of fecund 320Nm/h and the liquid argon of 12Nm/h, be greatly promoted income；
The present invention has structure composition rationally, and flow process is simple, it is easy to operate to use, safe and reliable, can effectively reduce expanded air Bypass amount, avoid the features such as wastage of material as far as possible.
Accompanying drawing explanation
Fig. 1 is the structure theory of constitution figure of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be described in detail: shown in Fig. 1, and one of the present invention is matched in external pressure The expanded air bypass amount of contracting space division reduces device, and it includes the upper tower C2 of an external compression space division rectifying column, a liquid nitrogen storage SV, The bottom of described liquid nitrogen storage SV by be serially connected with low temperature liquid nitrogen pump NP and return tower liquid nitrogen regulation valve V2 return tower liquid nitrogen pipe Line is connected to tower C2；Accessing tap on expanded air pipeline at upper tower C2 has a road to be serially connected with the swollen of expanded air bypass valve V3 Swollen air by-pass pipeline.
Shown in figure, the tap on tower liquid nitrogen pipeline of returning of described low temperature liquid nitrogen pump NP outlet has a road to be serially connected with backflow regulation Valve V1, for controlling the reflux pipe of low temperature liquid nitrogen pump NP outlet pressure；Described low temperature liquid nitrogen pump NP is by being controlled by variable frequency adjustment The low temperature liquid nitrogen pump driven by motor of device, described variable frequency adjustment device is used for regulating low temperature liquid nitrogen pump discharge liquid nitrogen flow；Described return tower Liquid nitrogen pipeline and lower tower liquid nitrogen runner and after connecing together be connected to upper tower C2；The described tower liquid nitrogen pipeline that returns is also equipped with for connecting change Frequently the effusion meter of actuator.
A kind of utilize described in be matched in the expanded air bypass amount of external compression space division and reduce device to reduce by expanded air The method of flux, the method includes:
A, carry out flow scheme design, engineering design and installation and debugging；
B, space division start normal, stable conditions；It is adapted, if expanded air can not fully enter tower C2, then enters next step；
C, return tower all devices facility all carry out startup before preparation；
D, startup low temperature liquid nitrogen pump NP, infinite reflux；
E, slowly open return tower liquid nitrogen regulation valve V2, step up FIC1；Turn down expanded air bypass valve V3, reduce FIC2, FIC2 reduction amount/FIC1 is fixed numbers, regulates other relevant parameters simultaneously, to guarantee fractionating column rectification stable conditions；
Bypass valve V3 is fully closed for f, air to be expanded, and after stable conditions；In conjunction with regulating working conditions, gradually reduce FIC1, will not drop On the premise of hypoxia Argon recovery rate and stable conditions, find minimum FIC1.
It is best that described liquid nitrogen derives from the supporting liquefying plant of space division, if the inexpensive also buyable of liquid nitrogen.
After liquid nitrogen in liquid nitrogen storage SV enters low temperature liquid nitrogen pump NP, enter upper tower C2 by returning tower liquid nitrogen pipeline, pass through Return tower liquid nitrogen stream amount control device and control to return tower liquid nitrogen flow, reduce expanded air bypass amount the most by a certain percentage, by going out Ice chest product oxygen flux control Argon fraction is stable, and main cold liquid level is automatically controlled by product liquid oxygen valve, so that fractional distillation Tower stable conditions, the most same raw air can the more oxygen of output and argon.

Claims (3)

1. the expanded air bypass amount being matched in external compression space division reduces a device, and it includes an external compression space division rectifying column Upper tower C2, a liquid nitrogen storage SV, it is characterised in that the bottom of described liquid nitrogen storage SV by be serially connected with low temperature liquid nitrogen pump NP with And the tower liquid nitrogen pipeline that returns returning tower liquid nitrogen regulation valve V2 is connected to tower C2；Accessing to tap on expanded air pipeline at upper tower C2 has One tunnel is serially connected with the expanded air bypass line of expanded air bypass valve V3.
The expanded air bypass amount being matched in external compression space division the most according to claim 1 reduces device, it is characterised in that The tap on tower liquid nitrogen pipeline of returning of described low temperature liquid nitrogen pump NP outlet has a road to be serially connected with return valve V1, for controlling low temperature The reflux pipe of liquid nitrogen pump NP outlet pressure；Described low temperature liquid nitrogen pump NP is by the low temperature liquid nitrogen pump motor being controlled by variable frequency adjustment device Drive；Described return tower liquid nitrogen pipeline and lower tower liquid nitrogen runner and connect after together be connected to upper tower C2；The described tower liquid nitrogen pipeline that returns also is pacified Equipped with the effusion meter for connecting variable frequency adjustment device.
3. the expanded air bypass amount being matched in external compression space division utilized described in claim 1 or 2 reduces device with fall The method of low bulk air by-pass amount, it is characterised in that the method includes:
A, carry out flow scheme design, engineering design and installation and debugging；
B, space division start normal, stable conditions；It is adapted, if expanded air can not fully enter tower C2, enters next step；
C, return tower all devices facility all carry out startup before preparation；
D, startup low temperature liquid nitrogen pump NP, infinite reflux；
E, slowly open return tower liquid nitrogen regulation valve V2, step up FIC1；Turn down expanded air bypass valve V3, reduce FIC2, FIC2 reduction amount/FIC1 is fixed numbers, regulates other relevant parameters simultaneously, to guarantee fractionating column rectification stable conditions；
Bypass valve V3 is fully closed for f, air to be expanded, and after stable conditions；In conjunction with regulating working conditions, gradually reduce FIC1, will not drop On the premise of hypoxia Argon recovery rate and stable conditions, find minimum FIC1.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108468946A (en) * 2018-05-24 2018-08-31 浙江智海化工设备工程有限公司 A kind of the automation charging system and automation methods for filling of low-temperature liquid storage tank
CN114307789A (en) * 2021-12-30 2022-04-12 浙江大学 High-temperature high-pressure gas rapid production system and method based on liquid nitrogen pressurization

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JP2001056177A (en) * 1997-01-14 2001-02-27 Air Water Inc Air separation unit
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CN202328999U (en) * 2011-12-01 2012-07-11 液化空气(杭州)有限公司 Air separating equipment with quick start
CN102829605A (en) * 2012-09-08 2012-12-19 浙江海天气体有限公司 Air separation device for supplying cold energy for preparing liquid oxygen by utilizing liquid nitrogen backward filling
CN204329469U (en) * 2014-12-16 2015-05-13 新余钢铁集团有限公司 Cryogenic liquid returns filling device
CN206019153U (en) * 2016-05-31 2017-03-15 浙江智海化工设备工程有限公司 A kind of expanded air bypass amount for being matched in external compression space division reduces device

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CN108468946A (en) * 2018-05-24 2018-08-31 浙江智海化工设备工程有限公司 A kind of the automation charging system and automation methods for filling of low-temperature liquid storage tank
CN114307789A (en) * 2021-12-30 2022-04-12 浙江大学 High-temperature high-pressure gas rapid production system and method based on liquid nitrogen pressurization

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Address after: No. 280 Xingye Road, Leidian Town, Deqing County, Huzhou City, Zhejiang Province, 313219

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