CN1979069A - Device for liquified recovering nitrogen, oxygen product in nitrogen expansion circulation - Google Patents
Device for liquified recovering nitrogen, oxygen product in nitrogen expansion circulation Download PDFInfo
- Publication number
- CN1979069A CN1979069A CN 200510130915 CN200510130915A CN1979069A CN 1979069 A CN1979069 A CN 1979069A CN 200510130915 CN200510130915 CN 200510130915 CN 200510130915 A CN200510130915 A CN 200510130915A CN 1979069 A CN1979069 A CN 1979069A
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- CN
- China
- Prior art keywords
- nitrogen
- outlet
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- liquefier
- liquid separator
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- F25J3/04151—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
- F25J3/04218—Parallel arrangement of the main heat exchange line in cores having different functions, e.g. in low pressure and high pressure cores
- F25J3/04224—Cores associated with a liquefaction or refrigeration cycle
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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
- F25J3/04333—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
- F25J3/04351—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 nitrogen
- F25J3/04357—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 nitrogen and comprising a gas work expansion loop
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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
- F25J3/04406—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
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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 invention discloses a device that could recover nitrogen and oxygen products in nitrogen expansion recycling. The feature is that it sets liquefier, gas liquid separator and valve pipeline. The liquefier has two channels. One channel connects with outlet of blower, and two outlets connect to the intake of expander and the intake of gas liquid separator. Another intake of channel connects with outlet of expander, and the outlet connects to the intake of nitrogen compressing machine. Gas liquid separator has three outlets. The invention could replace outer liquefying plant and has the advantages of low invention, simple structure, easy to operate, short starting time, and sharply improving the product utilization factor.
Description
The present invention relates to a kind of air separation products retracting device, relate in particular to the device of liquefaction recovery nitrogen, oxygen product in a kind of nitrogen expansion cycles.
Modern steel enterprise, steel-making, ironmaking be unable to do without oxygen, nitrogen.Carry out oxygen decarburization, smelting molten steel as steel making oxygen gas; Pulverized coal injection with nitrogen as the conveying gas of fine coal etc.With steel-making, the supporting air separation equipment of ironmaking, frequent and steel-making, ironmaking are produced incompatible and are forced a large amount of product oxygen, nitrogen to diffuse, and cause the wasting of resources, the operating cost height.Many enterprises have taked various measures in order to reduce this diffusing, as outer liquefying plant is installed, and increase the bunkerage capacity, strengthen the empty varying duty regulating power that divides, and strengthen online phone contact etc.In recent years, outer liquefying plant more and more is used widely as the most effective Load Regulation means, still, is equipped with outer liquefying plant, needs to dispose two decompressors of high and low temperature, a main heat exchanger, a liquefier, ice chest etc. independently in addition.System equipment is many, the pipeline complexity, and operational sequence is many, and start-up time is long, and investment is big.
It is little, simple in structure, easy to operate to the purpose of this invention is to provide a kind of investment, and start-up time is short, and the device of nitrogen, oxygen product is reclaimed in the interior liquefaction of nitrogen expansion cycles that improves the air separation products utilization rate greatly.
Existing air separation equipment system is provided with two cover booster expansion machines usually, and the normal operation of a cover is another set of standby.Intention of the present invention is to make full use of existing equipment, sets up liquefier, gas-liquid separator is finished apparatus of the present invention.This device comprises tower, liquid nitrogen storage and valve line in nitrogen compressor, supercharger, decompressor, liquefier, gas-liquid separator, the rectifying, it is characterized in that liquefier is provided with two passes, article one, the passage upper inlet links by the outlet of pipeline valve and supercharger, centre exit links by the import of pipeline valve and decompressor, lower part outlet links by the upper inlet of pipeline valve and gas-liquid separator, another passage lower inlet links by pipeline valve and decompressor outlet, and the top outlet links by pipeline valve and nitrogen compressor import; Gas-liquid separator is provided with three outlets, and top exit links by pipeline valve and dirty nitrogen pipe network, and lower part outlet links by tower upper inlet in pipeline throttle and the rectifying, and outlet at bottom links by pipeline valve and liquid nitrogen storage import.When pipe network user nitrogen demand reduces to a certain amount of, be that nitrogen is when more than needed, can carry out liquefaction operation in the nitrogen expansion cycles, close and this device-independent valve, be throttled into 0.5～0.6MPa from nitrogen compressor 1.6～2.5MPa pipe network nitrogen by throttle, enter supercharger and be pressurized to 0.8～1.0MPa, enter liquefier by pipeline valve and carry out heat exchange, part nitrogen is drawn from the liquefier centre exit, enter the nitrogen decompressor by pipeline valve, this moment, inlet temperature was-135 ℃～-137 ℃, drop to-181 ℃～-183 ℃ through nitrogen decompressor expansion back temperature, pressure is 0.06～0.08MPa, and the nitrogen after the expansion enters the low-temperature receiver of liquefier as liquefaction again by pipeline valve, through being back to the import of nitrogen compressor after the liquefier re-heat; The low temperature nitrogen that another part nitrogen is inflated back flow back into liquefier is liquefied as liquid nitrogen, and cross and be as cold as-180 ℃, flow into the gas-liquid separator that is lower than the decompressor output pressure, after liquid nitrogen enters gas-liquid separator, the gas part enters dirty nitrogen pipe network by the outlet at top, carry out cold recovery, the liquid part directly enters liquid nitrogen storage, or be back to tower in the rectifying as phegma by the liquid nitrogen of lower part outlet through being throttled to 0.045～0.055MPa tower with under from rectifying, participate in rectifying,, make the liquefaction of the saturated oxygen steam in the tower in the part rectifying through the transfer of cold, change out liquid oxygen, be stored in the bottom of tower on the rectifying column.
The present invention compared with prior art, its advantage is:
1, liquefying plant has made full use of existing equipment in the nitrogen expansion cycles, and only needing increases a liquefier and a gas-liquid separator and a small amount of valve line, and the parts floor space that is increased is very little, and all be arranged in the existing big ice chest, so flow process is short, and is simple in structure, invests little.
2, outer liquefying plant is many owing to system equipment, the pipeline complexity, and operational sequence is many, and need 4 hours start-up time, and this device is simple relatively, and starting only needs 0.5 hour, so easy to operate, start-up time is short.
3, nitrogen more than needed by liquefier after a part of nitrogen return nitrogen compressor, another part liquefaction of nitrogen becomes in liquid nitrogen storage or the flow back into rectifying tower to carry out liquid nitrogen, liquid oxygen conversion, change the fluid oxygen product, improved the utilization rate of air separation products greatly, reduce and diffuse loss.
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is a structural representation of the present invention.
As shown in Figure 1, liquefier 1 is provided with two passes, article one, passage upper inlet connecting line valve 2 links with the outlet of supercharger 3, purpose makes the nitrogen after the supercharging can enter the liquefier heat exchange, centre exit connecting line valve 4 links with the import of decompressor 5, lower part outlet connecting line valve 6 links with the upper inlet of gas-liquid separator 7, can make the liquefaction of nitrogen through heat exchange become liquid nitrogen to flow into gas-liquid separator; Another passage lower inlet connecting line valve 8 links with decompressor 5 imports, top outlet connecting pipe line valve 9 links with nitrogen compressor 10 imports, be back to nitrogen compressor 10 imports after making the nitrogen re-heat after part is inflated, excessive for preventing to load, also be provided with emergency diffusion valve 11 on this pipeline.Gas-liquid separator 7 is provided with three outlets, and top exit connecting line valve 12 links with dirty nitrogen pipe network, is used for cold recovery; Tower 14 upper inlet link in lower part outlet connecting line valve 13 and the rectifying, make liquid nitrogen can be back to tower 14 participation rectifying in the rectifying; Outlet at bottom connecting line valve 15 links with liquid nitrogen storage 16 imports.Whole device is arranged in the existing big ice chest.When pipe network user nitrogen demand reduces to a certain amount of, nitrogen has when more than needed, can carry out the operation that nitrogen, oxygen product are reclaimed in liquefaction in the nitrogen expansion cycles.Close expanded air pipeline valve 17 this moment, 18,19,20,21, open throttle 22,1.6MPa pipe network nitrogen from nitrogen compressor 10 is throttled into 0.5MPa by throttle 22, enter supercharger 3 and be pressurized to 0.8MPa, enter liquefier 1 by pipeline valve 2 and carry out heat exchange, part nitrogen is drawn from liquefier 1 centre exit, enter decompressor 5 by pipeline valve 4, inlet temperature is-136 ℃, drop to-182 ℃ through nitrogen decompressor 5 expansion back temperature, pressure is 0.06MPa, and the nitrogen after the expansion enters the low-temperature receiver of liquefier 1 as liquefaction again by pipeline valve 8, through being back to the import of nitrogen compressor 10 after liquefier 1 re-heat; The low temperature nitrogen that another part nitrogen is inflated back flow back into liquefier 1 is liquefied as liquid nitrogen, and cross and be as cold as-180 ℃, flow into the gas-liquid separator 7 that is lower than decompressor 5 output pressures through pipeline valve 6 by liquefier 1 lower part outlet, after liquid nitrogen enters gas-liquid separator 7, become gas and partly enter dirty nitrogen pipe network through pipeline valve 12 by the outlet at top, carry out cold recovery, the liquid part directly enters liquid nitrogen storage 16 by pipeline valve 15.If liquid nitrogen will be converted to liquid oxygen, then valve-off 15, liquid nitrogen is back to tower 14 in the rectifying by lower part outlet is throttled to pressure 0.05MPa tower (not shown) under from rectifying through throttle 13 liquid nitrogen as phegma, participate in rectifying, transfer through cold, make the liquefaction of the saturated oxygen steam in the tower 14 in the part rectifying, change out liquid oxygen, be stored in the bottom of rectifying column.
The liquefier that the present invention relates to, gas-liquid separator are all public, and its internal structure repeats no more here.
Claims (1)
1, nitrogen is reclaimed in liquefaction in a kind of nitrogen expansion cycles, the device of oxygen product, comprise nitrogen compressor, supercharger, decompressor, liquefier, gas-liquid separator, tower in the rectifying, liquid nitrogen storage and valve line, it is characterized in that liquefier is provided with two passes, article one, the passage upper inlet links by the outlet of pipeline valve and supercharger, centre exit links by the import of pipeline valve and decompressor, lower part outlet links by the upper inlet of pipeline valve and gas-liquid separator, another passage lower inlet links by pipeline valve and decompressor outlet, and the top outlet links by pipeline valve and nitrogen compressor import; Gas-liquid separator is provided with three outlets, and top exit links by pipeline valve and dirty nitrogen pipe network, and lower part outlet links by tower upper inlet in pipeline throttle and the rectifying, and outlet at bottom links by pipeline valve and liquid nitrogen storage import.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510130915 CN1979069A (en) | 2005-12-08 | 2005-12-08 | Device for liquified recovering nitrogen, oxygen product in nitrogen expansion circulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510130915 CN1979069A (en) | 2005-12-08 | 2005-12-08 | Device for liquified recovering nitrogen, oxygen product in nitrogen expansion circulation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1979069A true CN1979069A (en) | 2007-06-13 |
Family
ID=38130323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510130915 Pending CN1979069A (en) | 2005-12-08 | 2005-12-08 | Device for liquified recovering nitrogen, oxygen product in nitrogen expansion circulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1979069A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104864681A (en) * | 2015-05-29 | 2015-08-26 | 新奥气化采煤有限公司 | Method and system for recycling pressure energy of natural gas pipeline network |
| CN104896872A (en) * | 2015-05-29 | 2015-09-09 | 新奥气化采煤有限公司 | Recovery utilization method and system of natural gas pipe network pressure energy |
| CN108072235A (en) * | 2016-11-17 | 2018-05-25 | 北大方正集团有限公司 | Space division system |
| CN108489194A (en) * | 2018-05-28 | 2018-09-04 | 张家港富瑞氢能装备有限公司 | Liquid nitrogen precooler device |
-
2005
- 2005-12-08 CN CN 200510130915 patent/CN1979069A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104864681A (en) * | 2015-05-29 | 2015-08-26 | 新奥气化采煤有限公司 | Method and system for recycling pressure energy of natural gas pipeline network |
| CN104896872A (en) * | 2015-05-29 | 2015-09-09 | 新奥气化采煤有限公司 | Recovery utilization method and system of natural gas pipe network pressure energy |
| CN108072235A (en) * | 2016-11-17 | 2018-05-25 | 北大方正集团有限公司 | Space division system |
| CN108489194A (en) * | 2018-05-28 | 2018-09-04 | 张家港富瑞氢能装备有限公司 | Liquid nitrogen precooler device |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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