CN103776239B - Multi-functional nitrogen-making device - Google Patents

Multi-functional nitrogen-making device Download PDF

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Publication number
CN103776239B
CN103776239B CN201410013927.9A CN201410013927A CN103776239B CN 103776239 B CN103776239 B CN 103776239B CN 201410013927 A CN201410013927 A CN 201410013927A CN 103776239 B CN103776239 B CN 103776239B
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nitrogen
supercharger
heat exchanger
liquid
condenser
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CN103776239A (en
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陈崇文
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ZHEJIANG HAITIAN GAS CO Ltd
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ZHEJIANG HAITIAN GAS CO Ltd
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Abstract

The invention belongs to nitrogen technical field processed, relate to multi-functional nitrogen-making device, a part for purified air is by passing to rectifier bottoms after main heat exchanger heat exchange, another part purified air sends into dirty nitrogen pipe network by sending into ET2 expander refrigeration after supercharger supercharging after main heat exchanger heat exchange cooling, oxygen-enriched liquid air is obtained in rectifier bottoms, condenser/evaporator top is delivered to after liquid air subcooler and throttling, the phegma of liquid nitrogen reflux to rectifying column top as rectifying column of condenser/evaporator, the dirty nitrogen obtained at condenser/evaporator low-pressure side top is sent to ET1 expander refrigeration, dirty nitrogen after re-heat sends into purification system, high pure nitrogen is obtained at rectifying column top, high pure nitrogen is through main heat exchanger re-heat or after main heat exchanger re-heat and supercharger, externally export high pure nitrogen successively, high-purity liquid nitrogen externally exports liquid nitrogen after liquid nitrogen subcooler, advantage is: energy consumption of the present invention is low, recovery rate is high, good in economic efficiency, flexible adjustment is reliable, be applicable to the equipment of making nitrogen of gas industry processed.

Description

Multi-functional nitrogen-making device
Technical field
The invention belongs to nitrogen technical field processed, refer in particular to a kind of nitrogen-making device that significantly can reduce energy consumption.
Background technology
Along with the develop rapidly of the every profession and trades such as electronic industry, metallurgy, metal-working industry, chemical industry, new material industry and petrochemical industry, increasing to the demand of nitrogen product, the air separation plant producing nitrogen is big power consumer, due to longtime running, how effectively to reduce energy consumption most important.Way general is at present demi-inflation, all the other throttlings, and the merit that decompressor exports is used for supercharging and adopts blower fan to brake emptying; Liquid air is only cold or only excessively cold with segment fluid flow simple heat exchange, equipment regulates dumb, otherwise output is had more than needed, emptying otherwise underproduce outsourcing liquid nitrogen of wanting supplements guarantee production, adopt these methods and process organization, the delivery of power supply department cannot meet the horsepower requirements of nitrogen user air separation plant processed.
Summary of the invention
The object of this invention is to provide a kind of multi-functional nitrogen-making device.
The object of the present invention is achieved like this:
Multi-functional nitrogen-making device, comprise the rectifying column connected with pipeline, condenser/evaporator, booster expansion turbine, main heat exchanger, liquid air subcooler, nitrogen subcooler, it is characterized in that: described booster expansion turbine is supercharger and the decompressor of coaxial connection, a part for purified air is by passing to rectifier bottoms after main heat exchanger heat exchange, another part purified air sends into dirty nitrogen pipe network by sending into ET2 expander refrigeration after supercharger supercharging after main heat exchanger heat exchange cooling, oxygen-enriched liquid air is obtained in rectifier bottoms, condenser/evaporator top is delivered to after liquid air subcooler and throttling, the phegma of liquid nitrogen reflux to rectifying column top as rectifying column of condenser/evaporator, the dirty nitrogen obtained at condenser/evaporator low-pressure side top is sent to ET1 expander refrigeration, dirty nitrogen after re-heat sends into purification system, under rectifying column, top of tower obtains high pure nitrogen, high pure nitrogen is through main heat exchanger re-heat or after main heat exchanger re-heat and supercharger, externally export high pure nitrogen successively, high-purity liquid nitrogen externally exports liquid nitrogen after liquid nitrogen subcooler.
The high pure nitrogen of above-mentioned external output goes out pressure tower control valve and regulates by the inlet valve at supercharger two ends, outlet valve, nitrogen the pressure externally exporting nitrogen.
Above-mentioned purified air and main heat exchanger and the pipeline that is communicated with supercharger are provided with valve, regulate the amount of liquid nitrogen of the adjustable external output of valve opening on purified air and main heat exchanger and the pipeline that is communicated with supercharger.
Above-mentioned rectifying column, condenser/evaporator are provided with liquid level gauge, the connecting pipe of described supercharger, decompressor, rectifying column and condenser/evaporator is provided with Pressure gauge.
The present invention gives prominence to compared to existing technology and useful technique effect is:
The present invention passes through tower dirty nitrogen expansion supercharging nitrogen, reduce overall tower pressure thus reduce compressor pressure, then overall energy consumption is made to decline, and liquid air be inflated the various cold fluid heat exchange such as dirty nitrogen and nitrogen cross cold after, reduce the water capacity of air, improve recovery rate, and have employed positive flowrate expansion and produce more refrigerating capacity, effectively can control compressor load, during increase load, tolerance increases, and by supercharging air swell refrigeration, converts unnecessary gas nitrogen to liquid nitrogen, the requirement of user's high purity nitrogen, high-purity liquid nitrogen can be met.Simultaneously by supercharger inlet valve, supercharger outlet valve, nitrogen goes out the switching between these 3 valves of pressure tower control valve, achieve the adjustment to Nitrogen pipe network pressure, supercharger valve V1 is entered by air, air enters rectifying column valve V2 and achieves the output controlling liquid nitrogen and produce, thus achieve and can produce the production object that high pure nitrogen also can produce high-purity liquid nitrogen, overall energy consumption can reduce by more than 15%, owing to there being two booster expansion turbines, avoid and affect production because of a booster expansion turbine fault, economic benefits, flexible adjustment is reliable, be applicable to the equipment of making nitrogen of gas industry processed.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, with specific embodiment, the invention will be further described, see Fig. 1:
Multi-functional nitrogen-making device, comprise the rectifying column C1 connected with pipeline, condenser/evaporator K1, booster expansion turbine, main heat exchanger E1, liquid air subcooler E2, nitrogen subcooler E3, described booster expansion turbine is supercharger and decompressor (A1 and the ET1 of coaxial connection, A2 and ET2), two supercharger A1, A2 and two decompressor ET1, ET2 forms two-step supercharging expansion gear, a part for purified air is by passing to bottom rectifying column C1 after main heat exchanger E1 heat exchange, another part purified air is by supercharger A2 supercharging, purified air after supercharging is sent into ET2 expander refrigeration and is sent into dirty nitrogen pipe network after main heat exchanger heat exchange cooling, oxygen-enriched liquid air is obtained bottom rectifying column C1, oxygen-enriched liquid air delivers to condenser/evaporator K1 top after liquid air subcooler E2 and throttling, the liquid nitrogen reflux of condenser/evaporator K1 to rectifying column C1 top as phegma, the dirty nitrogen obtained at condenser/evaporator low-pressure side top is sent to ET1 expander refrigeration, dirty nitrogen after re-heat sends into purification system, high pure nitrogen is obtained at rectifying column C1 top, high pure nitrogen is through main heat exchanger E1 or after main heat exchanger E1 and supercharger A1, externally export high pure nitrogen successively, high-purity liquid nitrogen externally exports liquid nitrogen after liquid nitrogen filter E3.
The high pure nitrogen of above-mentioned external output goes out pressure tower control valve V3 and regulates by inlet valve V4, the outlet valve V5 at supercharger A1 two ends, nitrogen the pressure externally exporting nitrogen.
Above-mentioned purified air and main heat exchanger E1 and the pipeline that is communicated with supercharger A2 are provided with valve V2, V1, regulate the amount of liquid nitrogen of the adjustable external output of aperture of valve V2, the V1 on purified air and main heat exchanger E1 and the pipeline that is communicated with supercharger.
Above-mentioned rectifying column C1, condenser/evaporator K1 are provided with liquid level gauge, the connecting pipe of described supercharger A1, A2, decompressor ET1, ET2, rectifying column C1 and condenser/evaporator K1 is provided with Pressure gauge.
Above-described embodiment is only preferred embodiment of the present invention, not limits the scope of the invention according to this, therefore: all equivalence changes done according to structure of the present invention, shape, principle, all should be covered by within protection scope of the present invention.

Claims (4)

1. multi-functional nitrogen-making device, comprise the rectifying column connected with pipeline, condenser/evaporator, first booster expansion turbine, second booster expansion turbine, main heat exchanger, liquid air subcooler, nitrogen subcooler, it is characterized in that: the first described booster expansion turbine is the first supercharger and first decompressor of coaxial connection, the second described booster expansion turbine is the second supercharger and second decompressor of coaxial connection, a part for purified air is by passing to rectifier bottoms after main heat exchanger heat exchange, another part purified air sends into dirty nitrogen pipe network by sending into the second expander refrigeration after the second supercharger supercharging after main heat exchanger heat exchange cooling, oxygen-enriched liquid air is obtained in rectifier bottoms, condenser/evaporator top is delivered to after liquid air subcooler and throttling, the phegma of liquid nitrogen reflux to rectifying column top as rectifying column of condenser/evaporator, the dirty nitrogen obtained at condenser/evaporator low-pressure side top is sent to the first expander refrigeration, dirty nitrogen after re-heat sends into purification system, high pure nitrogen is obtained at rectifying column top, high pure nitrogen is through main heat exchanger re-heat or after main heat exchanger re-heat and the first supercharger, externally export high pure nitrogen successively, high-purity liquid nitrogen externally exports liquid nitrogen after nitrogen subcooler.
2. multi-functional nitrogen-making device according to claim 1, is characterized in that: the high pure nitrogen of described external output goes out pressure tower control valve and regulates by the inlet valve at the first supercharger two ends, outlet valve, nitrogen the pressure externally exporting nitrogen.
3. multi-functional nitrogen-making device according to claim 1, it is characterized in that: described purified air and main heat exchanger and the pipeline that is communicated with the second supercharger are provided with valve, regulate the amount of liquid nitrogen of the adjustable external output of valve opening on purified air and main heat exchanger and the pipeline that is communicated with the second supercharger.
4. the multi-functional nitrogen-making device according to any one of claim 1-3, it is characterized in that: described rectifying column, condenser/evaporator are provided with liquid level gauge, the connecting pipe of described first supercharger, the second supercharger, the first decompressor, the second decompressor, rectifying column and condenser/evaporator is provided with Pressure gauge.
CN201410013927.9A 2014-01-13 2014-01-13 Multi-functional nitrogen-making device Active CN103776239B (en)

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Publication number Priority date Publication date Assignee Title
HUE045459T2 (en) * 2017-06-02 2019-12-30 Linde Ag Method for producing one or more air products and air separation system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63197868A (en) * 1987-02-12 1988-08-16 Hitachi Ltd Nitrogen generator using turbine-compressor
DE4109945A1 (en) * 1991-03-26 1992-10-01 Linde Ag METHOD FOR DEEP TEMPERATURE DISPOSAL OF AIR
DE19735154A1 (en) * 1996-10-30 1998-05-07 Linde Ag Producing compressed nitrogen@ by low temperature distillation of air in rectifier system
US8991209B2 (en) * 2010-12-13 2015-03-31 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process and installation for producing high-pressure nitrogen
CN202470620U (en) * 2012-01-29 2012-10-03 济南鲍德气体有限公司 Low-temperature liquid nitrogen cold source feed device for krypton-xenon rectifying tower
CN102620520B (en) * 2012-04-09 2014-09-17 开封黄河空分集团有限公司 Process for preparing pressure oxygen and pressure nitrogen as well as by-product liquid argon through air separation
CN103277981B (en) * 2013-06-14 2015-05-06 济钢集团有限公司 Device and method for increasing nitrogen-to-oxygen ratio of air separation unit
CN203848603U (en) * 2014-01-13 2014-09-24 浙江海天气体有限公司 Multifunctional nitrogen making device

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