CN106091575B - It is a kind of being matched in external compression space division expanded air bypass amount reduce device and reduce method - Google Patents

It is a kind of being matched in external compression space division expanded air bypass amount reduce device and reduce method Download PDF

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Publication number
CN106091575B
CN106091575B CN201610376127.2A CN201610376127A CN106091575B CN 106091575 B CN106091575 B CN 106091575B CN 201610376127 A CN201610376127 A CN 201610376127A CN 106091575 B CN106091575 B CN 106091575B
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liquid nitrogen
tower
expanded air
space division
low temperature
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CN106091575A (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
    • 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
    • F25J3/04248—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
    • F25J3/04793—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

It is a kind of being matched in external compression space division expanded air bypass amount reduce device and reduce method, it includes the upper tower of an external compression space division rectifying column, one liquid nitrogen storage, the bottom of liquid nitrogen storage are connected to upper tower by being serially connected with low temperature liquid nitrogen pump and returning the tower liquid nitrogen pipeline that returns of tower liquid nitrogen regulating valve；Tap has the expanded air bypass line for being serially connected with expanded air by-passing valve V3 all the way on upper tower access expanded air pipeline；The method includes：A, flow scheme design and installation and debugging are carried out；B, space division starts normal, stable conditions；It is adapted, enter in next step if expanded air cannot fully enter tower；C, it returns tower all devices facility and all carries out preparation before startup；D, start low temperature liquid nitrogen pump, infinite reflux；The present invention by liquid nitrogen in storage tank by being supplemented into upper tower, tower rectifying potentiality in raising, so as to increase the flow that bypath air enters upper tower.

Description

A kind of expanded air bypass amount being matched in external compression space division reduces device and reduction Method
Technical field
Device is reduced the present invention relates to a kind of expanded air bypass amount being matched in external compression space division and reduces method, The case where cannot fully entering upper tower suitable for external compression space division bypath air, 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, expanded air can only enter since pressure is relatively low Upper tower, but since the reflux of upper tower is smaller, if expanded air fully enters tower, oxygen Argon recovery rate can be influenced, 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.
Invention content
It is an object of the invention to overcome the shortcomings of the prior art, and it is reasonable to provide a kind of structure composition, flow letter It is single, using easy to operate, it is safe and reliable, can effectively reduce expanded air bypass amount, avoid being matched in for wastage of material outer as possible Compressing the expanded air bypass amount of space division reduces device and reduces method.
The purpose of the present invention is by following technical solution to complete：A kind of expanded air being matched in external compression space division Bypass amount reduces device, it includes the upper tower of an external compression space division rectifying column, a liquid nitrogen storage, the bottom of the liquid nitrogen storage It is connected to upper tower by the tower liquid nitrogen pipeline that returns for being serially connected with low temperature liquid nitrogen pump and return tower liquid nitrogen regulating valve；It accesses and expands in upper tower Tap has the expanded air bypass line for being serially connected with expanded air by-passing valve all the way on air pipe line.
As preferred：The tap of returning on tower liquid nitrogen pipeline of the low temperature liquid nitrogen pump discharge has and is serially connected with reflux all the way and adjusts Valve, the return line for controlling low temperature liquid nitrogen pump discharge pressure；The low temperature liquid nitrogen pump is by being controlled by the low of variable frequency adjustment device Warm liquid nitrogen pump motor drives；It is described to return tower liquid nitrogen pipeline and lower tower liquid nitrogen runner and be connected to upper tower together after connecing；It is described to return tower liquid Nitrogen pipeline is also equipped with the flowmeter for connecting variable frequency adjustment device.
It is a kind of to reduce device using the above-mentioned expanded air bypass amount for being matched in external compression space division to reduce by expanded air The method of flux, this method include：
A, flow scheme design, engineering design and installation and debugging are carried out；
B, space division starts normal, stable conditions；It is adapted, if expanded air cannot fully enter tower, enter next Step；
C, it returns tower all devices facility and all carries out preparation before startup；
D, start low temperature liquid nitrogen pump, infinite reflux；
E, it slowly opens and returns tower liquid nitrogen regulating valve, step up FIC1；Expanded air by-passing valve is turned down, FIC2 is reduced, FIC2 reduction amounts/FIC1 is fixed numbers, while adjusting other relevant parameters, to ensure rectifying column rectifying stable conditions；
F, air to be expanded by-passing valve is fully closed, and after stable conditions；It is adjusted in conjunction with operating mode, gradually reduces FIC1, will not Under the premise of reducing oxygen Argon recovery rate and stable conditions, minimum FIC1 is found.
According to theoretical calculation, upper tower enter 1t/h liquid nitrogen can output about 1t/h liquid oxygen, rectifying potentiality can increase 1600Nm3/h Above ascending air greatly promotes income to the fecund oxygen of 320Nm3/h and the liquid argon of 12Nm3/h；
The present invention has structure composition reasonable, and flow is simple, using easy to operate, safe and reliable, can effectively reduce expansion Air by-pass amount avoids the features such as wastage of material as possible.
Description of the drawings
Fig. 1 is the structure composition schematic diagram of the present invention.
Specific implementation mode
Below in conjunction with attached drawing, the present invention will be described in detail：Shown in Fig. 1, one kind of the present invention is matched in external pressure The expanded air bypass amount of contracting space division reduces device, it includes the upper tower C2 of an external compression space division rectifying column, a liquid nitrogen storage SV, The bottom of the liquid nitrogen storage SV is by being serially connected with low temperature liquid nitrogen pump NP and that returns tower liquid nitrogen regulating valve V2 returns tower liquid nitrogen pipe Line is connected to tower C2；Tap has on upper tower C2 access expanded air pipelines is serially connected with the swollen of expanded air by-passing valve V3 all the way Swollen air by-pass pipeline.
As shown in the figure, the tap on tower liquid nitrogen pipeline of returning of the outlet the low temperature liquid nitrogen pump NP has and is serially connected with reflux all the way and adjusts Valve V1, the return line for controlling low temperature liquid nitrogen pump NP outlet pressures；The low temperature liquid nitrogen pump NP is by being controlled by variable frequency adjustment The low temperature liquid nitrogen pump motor of device drives, and the variable frequency adjustment device is for adjusting low temperature liquid nitrogen pump discharge liquid nitrogen flow；It is described to return tower Liquid nitrogen pipeline and lower tower liquid nitrogen runner are simultaneously connected to upper tower C2 after connecing together；The tower liquid nitrogen pipeline that returns is also equipped with for connecting change The flowmeter of frequency adjuster.
The expanded air bypass amount of external compression space division is matched in described in a kind of utilization reduces device to reduce by expanded air The method of flux, this method include：
A, flow scheme design, engineering design and installation and debugging are carried out；
B, space division starts normal, stable conditions；It is adapted, if expanded air cannot fully enter tower C2, under entering One step；
C, it returns tower all devices facility and all carries out preparation before startup；
D, start low temperature liquid nitrogen pump NP, infinite reflux；
E, it slowly opens and returns tower liquid nitrogen regulating valve V2, step up FIC1；Expanded air by-passing valve V3 is turned down, is reduced FIC2, FIC2 reduction amount/FIC1 are fixed numbers, while adjusting other relevant parameters, to ensure fractionating column rectifying stable conditions；
F, air to be expanded by-passing valve V3 is fully closed, and after stable conditions；It is adjusted in conjunction with operating mode, FIC1 is gradually reduced, not Under the premise of oxygen Argon recovery rate and stable conditions can be reduced, minimum FIC1 is found.
The liquid nitrogen is best from the mating 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, enters upper tower C2 by returning tower liquid nitrogen pipeline, pass through It returns the control of tower liquid nitrogen flow control device and returns tower liquid nitrogen flow, while reducing expanded air bypass amount by a certain percentage, by going out Ice chest product oxygen flux control Argon fraction is stablized, and main cold liquid level is automatically controlled by product liquid oxygen regulating valve, to make fractionation Tower stable conditions, final same raw air can the more oxygen of output and argon.

Claims (1)

1. a kind of reducing device to reduce expanded air bypass amount using the expanded air bypass amount for being matched in external compression space division Method, the expanded air bypass amount for being matched in external compression space division reduce device, it includes an external compression space division rectifying column Upper tower（C2）, a liquid nitrogen storage（SV）, the liquid nitrogen storage（SV）Bottom by being serially connected with low temperature liquid nitrogen pump（NP）And Return tower liquid nitrogen regulating valve（V2）The tower liquid nitrogen pipeline that returns be connected to tower（C2）；In Shang Ta（C2）It accesses on expanded air pipeline and divides It is connected to and is serially connected with expanded air by-passing valve all the way（V3）Expanded air bypass line；The low temperature liquid nitrogen pump（NP）It returns outlet There is tap on tower liquid nitrogen pipeline is serially connected with return valve all the way（V1）, for controlling low temperature liquid nitrogen pump（NP）Outlet pressure returns Flow tube road；The low temperature liquid nitrogen pump（NP）Low temperature liquid nitrogen pump motor by being controlled by variable frequency adjustment device drives；It is described to return tower liquid nitrogen Pipeline and lower tower liquid nitrogen runner are simultaneously connected to upper tower after connecing together（C2）；The tower liquid nitrogen pipeline that returns is also equipped with for connecting frequency conversion The flowmeter of adjuster；It is characterized in that this method includes：
A, flow scheme design, engineering design and installation and debugging are carried out；
B, space division starts normal, stable conditions；It is adapted, if expanded air cannot fully enter tower（C2）Then enter next Step；
C, it returns tower all devices facility and all carries out preparation before startup；
D, start low temperature liquid nitrogen pump（NP）, infinite reflux；
E, it slowly opens and returns tower liquid nitrogen regulating valve（V2）, step up FIC1；Turn down expanded air by-passing valve（V3）, reduce FIC2, FIC2 reduction amount/FIC1 are fixed numbers, while adjusting other relevant parameters, to ensure fractionating column rectifying stable conditions；
F, air to be expanded by-passing valve（V3）It is fully closed, and after stable conditions；It is adjusted in conjunction with operating mode, gradually reduces FIC1, will not Under the premise of reducing oxygen Argon recovery rate and stable conditions, minimum FIC1 is found.
CN201610376127.2A 2016-05-31 2016-05-31 It is a kind of being matched in external compression space division expanded air bypass amount reduce device and reduce method Active CN106091575B (en)

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* 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

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001056177A (en) * 1997-01-14 2001-02-27 Air Water Inc Air separation unit
CN200958887Y (en) * 2006-10-10 2007-10-10 山西新临钢钢铁有限公司 Cryogenic oxygen-nitrogen liquid converter
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001056177A (en) * 1997-01-14 2001-02-27 Air Water Inc Air separation unit
CN200958887Y (en) * 2006-10-10 2007-10-10 山西新临钢钢铁有限公司 Cryogenic oxygen-nitrogen liquid converter
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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Address after: No. 280 Xingye Road, Leidian Town, Deqing County, Huzhou City, Zhejiang Province, 313219

Patentee after: Yingde Gas Engineering (Zhejiang) Co.,Ltd.

Address before: 313219 Jingyi Road, Linhang Industrial Zone, Deqing, Leidian Town, Huzhou City, Zhejiang Province

Patentee before: ZHEJIANG ZHIHAI CHEMICAL EQUIPMENT ENGINEERING Co.,Ltd.

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