CN106322917A - Technique for liquefying air through liquid nitrogen and rectifying classification - Google Patents
Technique for liquefying air through liquid nitrogen and rectifying classification Download PDFInfo
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- CN106322917A CN106322917A CN201510364695.6A CN201510364695A CN106322917A CN 106322917 A CN106322917 A CN 106322917A CN 201510364695 A CN201510364695 A CN 201510364695A CN 106322917 A CN106322917 A CN 106322917A
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Abstract
The invention discloses a technique for liquefying air through liquid nitrogen and rectifying classification. The technique comprises the steps that feed gas is sucked into an air compressor through an air filter, and enters a molecular sieve purification system to be purified after being delivered into an air cooling tower to be pre-cooled, so that CO2 and moisture are removed, then the feed gas is delivered into an air-separation cold box, and air entering the air-separation cold box is divided into two branches; one branch of air exchanges heat with low-temperature gas entering a main heat exchanger, and the branch of air is cooled to be in a saturated state to be delivered to the bottom of a lower tower body of a rectifying tower; and the other branch of air enters an air liquefier to exchange heat with circulating liquid nitrogen, cooled to be liquefied, and delivered to the upper portion of a lower rectifying tower, the air is rectified preliminarily on the upper portion of the lower rectifying tower, liquid nitrogen and gas nitrogen with the purity being 99.99% or over are obtained at the top of the lower tower body, and liquid enriched oxygen with the oxygen purity being about 35% is obtained at the bottom of the lower tower body. Compared with a device of the same scale in the prior art, by the adoption of the technique for liquefying air through liquid nitrogen and rectifying classification, electricity consumption can be reduced by 40%-50%, circulating water consumption can be reduced by about 50%-70%, and economic benefits and social benefits are considerable.
Description
Technical field
Technology provided by the present invention is to allow air and liquid nitrogen carry out alternately heat exchange also in ice chest equipment
Make a kind of application of liquefied air rectification, be different from prior art with turbine expansion compressor sky
Gas conveying cold.
Background technology
Temperature, pressure are air-fluidized two key conditions.When the condensing temperature of air reaches
-196 DEG C, sometimes for can somewhat gentle a little at a temperature of liquefaction and the pressure of air can be improved.
In order to reach the two condition in prior art, compressor and turbo-expander, Liang Zhe can be used
Substantial amounts of electric energy and Circulation Water it is required to during use.On present in prior art
Stating defect, the present invention proposes a kind of liquid nitrogen liquefied air rectification classification technique, is different from and uses turbine
Expansion compressor carries cold to air, but with liquid nitrogen by air liquefaction, and rectification divides in ice chest
Separate out pure oxygen, nitrogen and argon, and liquid nitrogen self is gasified as coolant, after recompression,
Go to absorb cold to recycle.
Summary of the invention
Technical problem solved by the invention is to provide a kind of liquid nitrogen liquefied air rectification classification technique,
Particularly as follows:
Unstripped gas is sucked by air compressor machine through air filter, after sending into air cooling tower pre-cooling, enters molecular sieve
Purification system purifies, and removes CO2 and moisture content, is re-fed into air separation cooling box, enters air separation cooling box
Air divides two strands；
One cryogenic gas entered in main heat exchanger carries out heat exchange, is cooled to saturation and sends into
Tower bottom under rectifying column；
Another strand of entrance air liquefier and circulating liquid nitrogen carry out heat exchange, are cooled to liquefaction, under feeding
Rectifier, air carries out preliminary rectification at this, and obtaining purity at the top of lower tower is 99.999%
The gentle nitrogen of above liquid nitrogen. obtaining oxygen purity in the bottom of lower tower is the liquid oxygen-enriched of about 35%.
Above-mentioned liquid nitrogen liquefied air rectification classification technique, wherein, liquid nitrogen is after subcooler, wherein
Purity is that the liquid nitrogen of 99.999% is as product releasing, loading LN2 storage tank；Remaining some is sent to
Pure argon column as producing the low-temperature receiver of essence argon product, other all send on rectifying column tower as producing under
The fraction of trip product；
A part of gas nitrogen, as the thermal source of pure argon column, sends into upper tower as fraction after self being liquefied；
Liquid oxygen-enriched is as producing downstream oxygen, the raw material of argon product, and it is divided into two strands after subcooler,
One is sent directly into tower on rectifying column, and another stock sends into condenser of crude argon tower, as producing the cold of crude argon
Source and the crude argon heat exchange in crude argon column, the liquid and vapor capacity formed sends into tower in the lump.
Above-mentioned liquid nitrogen liquefied air rectification classification technique, wherein, on rectifying column, tower rectification result is
Product liquid oxygen is formed at upper tower bottom, and purity is that the liquid oxygen product of 99.7% is released after supercool, loads
LO2 storage tank；
Gas phase argon fraction tower from rectifying column is extracted out, and through crude argon column rectification, crude argon is taken out at crude argon column top
Going out and deliver to pure argon column, liquid phase lean argon fraction flows out bottom crude argon column, sends tower on rectifying column back to；
Crude argon is rectification in pure argon column, and purity is that the smart argon product of more than 99.999% is bottom pure argon column
Formed and release, enter LAr storage tank.
The present invention has the advantages that, relative to prior art, the liquid nitrogen liquefaction sky that the present invention provides
Gas rectification classification technique, utilize the temperature of liquid nitrogen itself can reach the condensing temperature of air, by former work
Compressor and turbo-expander in process flow are all cancelled, and use this coolant of liquid nitrogen to carry out inverse with air
Stream heat exchange, is fed directly to rectifying column by the liquefied air after heat exchange, carries out air separating step.With
Compared with scale set, can using electricity wisely 40%-50%, save recirculated water consumption about 50%-70%,
Its economic benefit is considerable with social benefit.
It addition, one of product that nitrogen itself is also air to be separated, even if therefore producing in cyclic process
Give birth to certain loss also to be supplemented by the system of self, it is not necessary to outsourcing liquid nitrogen.Reduce and produce
During outsourcing cost.
Accompanying drawing explanation
Liquid nitrogen liquefied air that Fig. 1 provides for the present invention the schematic flow sheet of rectification classification technique.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
Liquid nitrogen liquefied air that Fig. 1 provides for the present invention the schematic diagram of rectification classification technique, Qi Zhongtu
In be respectively as follows:
Liquid after heat exchanger 1, lower tower 2, Ar tower 3, air 4, air compressor machine 5, air cooling tower 6, liquefaction
Nitrogen 7, pure liquid nitrogen 8, low temperature saturated air 9, low temperature saturated oxygen reflux pipeline 10, liquid oxygen flash distillation
Tank 11, liquid oxygen-enriched 12, liquid oxygen export pipeline 13, liquid oxygen tank 14, molecular sieve purification sled 15,
Room temperature pure air 16, thick Ar17, low temperature nitrogen 18, Ar tower 19, upper tower 20, low temperature nitrogen
21, nitrogen at room 22, nitrogen supercharging machine 23.
The liquefaction of air is carried out the most in two steps.The first step, air will be compressed to certain pressure,
Realized by compressor；Second step, by the air liquefaction after compression, this part uses turbo-expander
Thering is provided cold, the air after two-step pretreatment is admitted to ice chest, separates in rectifying column.?
During this, it is compressed the compressor of air and provides the turbo-expander of cold to be required in a large number
Electric energy and substantial amounts of recirculated water, real needs and actual production be directly proportional.
Liquid nitrogen liquefied air rectification classification technique that the present invention provides are different from above-mentioned prior art,
It the specific scheme is that unstripped gas (air) is sucked by air compressor machine through air filter, is compressed to 0.6MPa
Left and right, send into air cooling tower give cold after, enter sieve purification system and purify, remove CO2 and water
Part, it is re-fed into air separation cooling box.The air entering air separation cooling box divides two strands.
Wherein, the cryogenic gas (dirty nitrogen, purity nitrogen and circulating air) during one enters main heat exchanger is carried out
Heat exchange, is cooled to saturation and sends into tower bottom under rectifying column.Another stock enter air liquefier and
Circulating liquid nitrogen heat exchange, is cooled to liquefaction, sends into lower rectifier.Air carries out preliminary essence at this
Evaporate, obtain the gentle nitrogen of liquid nitrogen that purity is more than 99.999% at the top of lower tower.Bottom at lower tower
Obtain oxygen purity is the liquid oxygen-enriched of about 35%.Circulating liquid nitrogen consumption in use,
Can supplement with space division product liquid nitrogen, it is not necessary to outsourcing.
Liquid nitrogen is after subcooler, and its moderate purity is that the liquid nitrogen of 99.999% is as product releasing, loading LN2
Storage tank.Remaining, some sends to the pure argon column low-temperature receiver as production essence argon product, and other are all sent into
On rectifying column, tower is as the fraction producing downstream product (oxygen, argon). and a part of gas nitrogen is as pure argon column
Thermal source, sends into upper tower as fraction after self being liquefied.
Liquid oxygen-enriched is to produce the raw material of downstream product (oxygen, argon), and it is divided into two strands after subcooler,
One is sent directly into tower on rectifying column.Another strand go condenser of crude argon tower as produce crude argon low-temperature receiver,
With the crude argon heat exchange in crude argon column, the liquid and vapor capacity formed sends into tower in the lump.
On rectifying column, tower rectification result is: product liquid oxygen is formed at upper tower bottom, and purity is 99.7%
Liquid oxygen product releases loading LO2 storage tank after supercool.
Gas phase argon fraction (argon raw material processed) tower from rectifying column is extracted out, and through crude argon column rectification, crude argon exists
Crude argon column top is extracted out and delivers to pure argon column.Liquid phase lean argon fraction flows out bottom crude argon column, sends essence back to
Evaporate tower on tower.
Crude argon is rectification in pure argon column, and purity is that the smart argon product of more than 99.999% is bottom pure argon column
Formed and release, enter LAr storage tank.
Although the present invention discloses as above with preferred embodiment, so it is not limited to the present invention, appoints
What those skilled in the art, without departing from the spirit and scope of the present invention, when making a little amendment
With perfect, therefore protection scope of the present invention is when with being as the criterion that claims are defined.
Claims (3)
1. a liquid nitrogen liquefied air rectification classification technique, it is characterised in that:
Unstripped gas is sucked by air compressor machine through air filter, after sending into air cooling tower pre-cooling, enters molecular sieve
Purification system purifies, and removes CO2 and moisture content, is re-fed into air separation cooling box, enters air separation cooling box
Air divides two strands；
One cryogenic gas entered in main heat exchanger carries out heat exchange, is cooled to saturation and sends into
Tower bottom under rectifying column；
Another strand of entrance air liquefier and circulating liquid nitrogen carry out heat exchange, are cooled to liquefaction, under feeding
Rectifier, air carries out preliminary rectification at this, and obtaining purity at the top of lower tower is 99.999%
The gentle nitrogen of above liquid nitrogen. obtaining oxygen purity in the bottom of lower tower is the liquid oxygen-enriched of about 35%.
2. liquid nitrogen liquefied air as claimed in claim 1 rectification classification technique, it is characterised in that:
Liquid nitrogen is after subcooler, and its moderate purity is that the liquid nitrogen of 99.999% is as product releasing, loading LN2
Storage tank；Remaining some sends to the pure argon column low-temperature receiver as production essence argon product, and other are all sent into
On rectifying column, tower is as the fraction producing downstream product；
A part of gas nitrogen, as the thermal source of pure argon column, sends into upper tower as fraction after self being liquefied；
Liquid oxygen-enriched is as producing downstream oxygen, the raw material of argon product, and it is divided into two strands after subcooler,
One is sent directly into tower on rectifying column, and another stock sends into condenser of crude argon tower, as producing the cold of crude argon
Source and the crude argon heat exchange in crude argon column, the liquid and vapor capacity formed sends into tower in the lump.
3. liquid nitrogen liquefied air as claimed in claim 2 rectification classification technique, it is characterised in that:
On rectifying column, tower rectification result is that product liquid oxygen is formed at upper tower bottom, and purity is the liquid of 99.7%
Oxygen product is released after supercool, loads LO2 storage tank；
Gas phase argon fraction tower from rectifying column is extracted out, and through crude argon column rectification, crude argon is taken out at crude argon column top
Going out and deliver to pure argon column, liquid phase lean argon fraction flows out bottom crude argon column, sends tower on rectifying column back to；
Crude argon is rectification in pure argon column, and purity is that the smart argon product of more than 99.999% is bottom pure argon column
Formed and release, enter LAr storage tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510364695.6A CN106322917A (en) | 2015-06-26 | 2015-06-26 | Technique for liquefying air through liquid nitrogen and rectifying classification |
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| CN201510364695.6A CN106322917A (en) | 2015-06-26 | 2015-06-26 | Technique for liquefying air through liquid nitrogen and rectifying classification |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106744697A (en) * | 2017-01-17 | 2017-05-31 | 孔祥旭 | A kind of super energy-conservation making oxygen by air separation device |
| WO2019127180A1 (en) * | 2017-12-28 | 2019-07-04 | 乔治洛德方法研究和开发液化空气有限公司 | Cryogenic rectification process-based method for producing air product, and air separation system |
| CN111486663A (en) * | 2020-04-08 | 2020-08-04 | 广州广钢气体能源股份有限公司 | Nitrogen making machine suitable for electronic gas factory |
| CN111773878A (en) * | 2020-06-29 | 2020-10-16 | 开封迪尔空分实业有限公司 | Air separation energy-saving control device and method |
| CN114322453A (en) * | 2021-12-27 | 2022-04-12 | 海澜智云科技有限公司 | Intelligent control method for industrial internet space division system based on 5G network |
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| CN106744697A (en) * | 2017-01-17 | 2017-05-31 | 孔祥旭 | A kind of super energy-conservation making oxygen by air separation device |
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| CN111486663B (en) * | 2020-04-08 | 2021-01-22 | 广州广钢气体能源股份有限公司 | Nitrogen making machine suitable for electronic gas factory |
| CN111773878A (en) * | 2020-06-29 | 2020-10-16 | 开封迪尔空分实业有限公司 | Air separation energy-saving control device and method |
| CN114322453A (en) * | 2021-12-27 | 2022-04-12 | 海澜智云科技有限公司 | Intelligent control method for industrial internet space division system based on 5G network |
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Application publication date: 20170111 |
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