CN105758117A - Pure nitrogen preparation method - Google Patents
Pure nitrogen preparation method Download PDFInfo
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- CN105758117A CN105758117A CN201410798312.1A CN201410798312A CN105758117A CN 105758117 A CN105758117 A CN 105758117A CN 201410798312 A CN201410798312 A CN 201410798312A CN 105758117 A CN105758117 A CN 105758117A
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Abstract
The invention relates to a pure nitrogen preparation method which comprises the steps that air is pretreated by a pretreatment device, wherein the pretreatment device comprises an air filter, an air compressor, a heat regenerator, a cooler and a precooler which are distributed and arranged in sequence in the flow direction of air, that is the air is subjected to filtration, compression, heat regeneration, cooling and precooling; the precooled air is purified by a purifier; the purified air is fed into a rectifying tower which comprises a lower tower and an upper tower; an inlet which is used for receiving saturated gas purified by the purifier is formed in the bottom of the lower tower, a tower plate is arranged inside the lower tower, a heat exchange liquid hole which is used for inputting heat exchange liquid is formed in the top of the lower tower, and a pure nitrogen outlet which is used for outputting pure nitrogen is formed in the top of the lower tower and is further connected with a nitrogen condenser so as to obtain pure liquid nitrogen.With the adoption of the method, purer nitrogen can be obtained.
Description
Technical field
The present invention relates to a kind of air-separating plant, particularly relate to a kind of pure liquid nitrogen preparation method.
Background technology
Air separation plant, usually with air for raw material, can become air into liquid by methods such as compression depth of round freezings and go out liquid gas then through rectification, it is also possible to progressively separation of produced goes out the noble gases such as oxygen, nitrogen and argon from liquid air.In the prior art, air separation plant makes unremitting effort to improve the purity of gas.Air separation plant generally comprises air compressor machine, purifier and rectifying column.Air compressor machine, also known as air compressor, generally just it is to provide source of the gas power, is the main body in the nucleus equipment electromechanics bleed air source device of pneumatic system, it is the device that the mechanical energy of former dynamic (usually motor) converts to gas pressure energy, is compressed-air actuated pressure generator.Purifier (purifier) is a visual plant in liquefaction gas processes.Gas is progressively cooled cooling in refrigerative circle system, before reaching condensation temperature, foreign gas in gas will condense into solid and be attached to pipeline and valve etc., even into decompressor, liquefier is finally made to quit work, so installing purifier in liquefaction process, taking chemical method or freezing method or physical adsorption process to remove impurity by the type of impurity, reaching the purpose of purification for gas.Rectifying column is by the tower vapor-liquid contacting apparatus of one of rectification.There are plate column and two kinds of main Types of packed tower.Continuous rectifying tower and batch fractionating tower can be divided into again according to mode of operation.
But find through practice for many years, adopt air separation plant conventional in prior art, still cannot obtain more pure pure nitrogen gas.
Summary of the invention
In order to overcome the drawbacks described above of prior art, the technical problem to be solved is to provide a kind of pure liquid nitrogen preparation method, to obtain more pure pure nitrogen gas.
For reaching above-mentioned purpose, the technical scheme is that
A kind of pure liquid nitrogen preparation method, it is characterised in that it includes:
Air is carried out pretreatment by pretreatment unit, described pretreatment unit include sequentially arranging along the flow direction of air arrange air filter, air compressor machine, regenerator, cooler, precooler, namely air is through filtration, compression, backheat, cooling and pre-cooling；
Air after pre-cooling is purified by purifier；
Air after purification passes into rectifying column, and described rectifying column includes Xia Ta, Shang Ta；
The bottom of described lower tower offers for accepting the saturated gas entrance after purifier purification, the inside of described lower tower is provided with column plate, the top of described lower tower has the heat exchange fluid apertures for inputting heat exchange liquid, the top of described lower tower is provided with the pure nitrogen gas outlet for exporting pure nitrogen gas, and the outlet of described pure nitrogen gas is also associated with a nitrogen condenser to obtain pure liquid nitrogen.
Preferably, described column plate has multiple, and multiple described column plates are longitudinally arranged, and the heat exchanging holes on described column plate becomes larger to upper and lower side from middle.
Preferably, the middle part of described lower tower is provided with dirty nitrogen outlet, and described dirty nitrogen outlet is connected to a dirty nitrogen filter, and the outlet of described dirty nitrogen filter is connected with the heat exchange fluid apertures of described lower top of tower.
Preferably, described air filter is self-cleaning air filter.
The present invention adopts said method, it is possible to obtain more pure pure nitrogen gas.
Accompanying drawing explanation
Accompanying drawing described here only for illustrative purposes, and is not intended to limit scope disclosed by the invention by any way.It addition, the shape of each parts in figure and proportional sizes etc. are only schematic, it is adapted to assist in the understanding of the present invention, is not the shape and the proportional sizes that specifically limit each parts of the present invention.Those skilled in the art is under the teachings of the present invention, it is possible to select various possible shape and proportional sizes to implement the present invention as the case may be.
Fig. 1 is the structure principle chart of the pure liquid nitrogen preparation method in the present invention.
The accompanying drawing labelling of the figures above: 10, pretreatment unit；11, air filter；12, air compressor machine；13, regenerator；14, cooler；15, precooler；20, purifier；21, absorbing cylinder；22, heater；23, controller；30, rectifying column；31, Xia Ta；310, column plate；311, pure nitrogen gas outlet；312, heat exchange fluid apertures；313, dirty nitrogen outlet；314, nitrogen condenser；32, Shang Ta.
Detailed description of the invention
Description in conjunction with accompanying drawing and the specific embodiment of the invention, it is possible to clearly understand the details of the present invention.But, the detailed description of the invention of invention described herein, only for illustrative purpose, and can not be understood as by any way is limitation of the present invention.Under the teachings of the present invention, technical staff is it is contemplated that based on the arbitrarily possible deformation of the present invention, these are regarded as belonging to the scope of the present invention.
The invention discloses a kind of pure liquid nitrogen preparation method, it includes:
Air is carried out pretreatment by pretreatment unit 10, described pretreatment unit include sequentially arranging along the flow direction of air arrange air filter 11, air compressor machine 12, regenerator 13, cooler 14, precooler 15, namely air is through filtration, compression, backheat, cooling and pre-cooling；
Air after pre-cooling is purified by purifier 20；
Air after purification passes into rectifying column 30, and described rectifying column includes lower tower 31, upper tower 32；
The bottom of described lower tower 31 offers for accepting the saturated gas entrance after purifier purification, the inside of described lower tower 31 is provided with column plate 310, the top of described lower tower has the heat exchange fluid apertures 312 for inputting heat exchange liquid, the top of described lower tower is provided with the pure nitrogen gas outlet 311 for exporting pure nitrogen gas, and the outlet of described pure nitrogen gas is also associated with a nitrogen condenser to obtain pure liquid nitrogen.
The invention discloses a kind of pure liquid nitrogen preparation method, it includes pretreatment unit 10, purifier 20 and rectifying column 30.
Pretreatment unit 10 include along air flow direction sequentially arrange arrange air filter 11, air compressor machine 12, regenerator 13, cooler 14, precooler 15.Air through self-cleaning air filter 11, is sucked by air compressor machine 12 after removing in air the mechanical admixtures such as overwhelming majority dusts, through three stage compression, secondary intercooling, air pressure brings up to 1.0MPa, and compression air enters regenerator 13, aftercooler 14, is cooled to about 40 DEG C.Subsequently, compression air enters precooler 15.Air carries out caloic exchange with the water at low temperature come from water-cooling tower in air cooling tower, is cooled to 10 DEG C from 40 DEG C.Saturation moisture content when water content in air is also from 40 DEG C is reduced to saturation moisture content when 10 DEG C.The precipitation it is to say, the most water vapour in air are condensed, and remove in air cooling tower, this will significantly improve the working condition of downstream purification device 20.Precooler 15 adopts waste gas (drying) the feeding water-cooling tower that fractionating column is discharged to carry out caloic exchange, and waste gas enters cooling heat transfer water mass transfer dirty with tower top bottom water-cooling tower, and waste gas enters air from water-cooling tower top, cools down water in the temperature at the bottom of tower up to about 20 DEG C.This cooling water is further cooled after pump boosts in handpiece Water Chilling Units, is then divided into two strands, and one is sent into air cooling tower top and removes cooled compressed air, uses air cooling tower air themperature and is about 10 DEG C.One go decompressor A aftercooler 14 to cool down supercharging after air.Air filter 11 is ZKG-500 self-cleaning air filter 11.
Purifier 20 is for receiving the air of described pretreatment unit 10 output.Described purifier 20 includes two absorbing cylinders 21 being built-in with filter element being arranged in parallel, and is arranged on the heater 22 outside each absorbing cylinder 21, for controlling purifier 20 controller 23 of described absorbing cylinder 21 break-make and described heater 22.Pre-cooling dewater after compression air enter purifier 20 water segregator in will air dissociate water removing.Afterwards when purifier 20 absorbing cylinder 21, residue water vapour and carbon dioxide in air are attracted in adsorbent activity aluminium oxide and 13X molecular sieve.Purifier 20 is by 21, electric heater 22 of absorbing cylinder of two built-in activated aluminas and 13X molecular sieve, a set of control valve and a switch board composition.Air is by a wherein absorbing cylinder 21, and carbon dioxide and residue water vapour in air are attracted to molecular sieve and in activated alumina, make air be purified.Adsorbent in one absorbing cylinder 21 is after four hours work, by saturated and lose absorbability by the water vapour in air and carbon dioxide institute.At this moment, the adsorbent in this absorbing cylinder 21 will regenerate, to recover its ability to work.For this, air is passed into another and has regenerated complete absorbing cylinder 21, the absorbing cylinder 21 losing absorbability then proceeds to regeneration regime.The dirty nitrogen discharged with decompressor B supercharger sends into absorbing cylinder 21 after regenerator 13, electric heater 22 are heated to 150～180 DEG C, is parsed with carbon dioxide by the water vapour of activated alumina with molecular sieve internal adsorption, enters air.When absorbing cylinder 21 outlet temperature reaches 60 DEG C, electric control gear automatically turns off electric heater 22, and three-way valve is switched to without regenerator 13, electric heater 22 stream, is directly entered absorbing cylinder 21 blast-cold after the intensified gas heat exchanger cooling of dirty nitrogen.So that absorbing cylinder 21 after blast-cold terminates temperature close to its adsorb time operating temperature.By such switching and regeneration, the air going out purifier 20 has just constantly reached purification.The work of regenerator 13 is to be interrupted.When absorbing cylinder 21 thermal regeneration, regenerator 13 works, namely V1220 three-way valve is connected and is gone regenerator 13, electric heater 22 to heat, and when absorbing cylinder 21 proceeds to the blast-cold stage, regeneration gas is sent directly into absorbing cylinder 21 blast-cold by purifier 20 electrical control cubicles interlocked control V1220 three-way valve.This is done in the heating period, the regeneration gas entering electric heater 22 has higher temperature, to reduce the power of electric heater 22, saves energy.Reduce regeneration gas temperature through dirty nitrogen cooler 14 cooling during blast-cold, accelerate the speed of cold blowing.
Rectifying column 30, described rectifying column 30 includes lower tower 31, upper tower 32.
The bottom of described lower tower 31 offers for accepting the saturated gas after purifier 20 purification, the inside of described lower tower 31 is provided with column plate 310, the top of described lower tower 31 has the heat exchange fluid apertures 312 for inputting heat exchange liquid, and the top of described lower tower 31 is provided with the pure nitrogen gas outlet 311 for exporting pure nitrogen gas.The outlet of described pure nitrogen gas is also associated with a nitrogen condenser 314 to obtain pure liquid nitrogen.
The middle part of described lower tower is provided with dirty nitrogen outlet 313, and described dirty nitrogen outlet 313 is connected to a dirty nitrogen filter, and the outlet of described dirty nitrogen filter is connected with the heat exchange fluid apertures 312 of described lower top of tower.
The saturated air entered bottom lower tower 31 rises along column plate 310 aperture, on each block of column plate 310, heat exchange and mass exchange is carried out repeatedly with the liquid flowed down from lower tower 31 top block-by-block column plate 310, finally obtain pure nitrogen gas at lower tower 31 top, at the bottom of tower, obtain oxygen enriched liquid air.Liquid nitrogen fraction is extracted out in the middle part of lower tower 31.Liquid nitrogen fraction sends into upper tower 32 top with liquefaction heat exchanger liquid nitrogen fraction out after converging after the liquid nitrogen supercool throttling of liquid nitrogen fraction subcooler, as the backflow of upper tower 32.
Each embodiment in this specification all adopts the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar part mutually referring to.
Above-described embodiment only for technology design and the feature of the present invention are described, its object is to allow person skilled in the art will appreciate that present disclosure and to implement according to this, can not limit the scope of the invention with this.All equivalences made according to spirit of the invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (4)
1. a pure liquid nitrogen preparation method, it is characterised in that it includes:
Air is carried out pretreatment by pretreatment unit, described pretreatment unit include sequentially arranging along the flow direction of air arrange air filter, air compressor machine, regenerator, cooler, precooler, namely air is through filtration, compression, backheat, cooling and pre-cooling；
Air after pre-cooling is purified by purifier；
Air after purification passes into rectifying column, and described rectifying column includes Xia Ta, Shang Ta；
The bottom of described lower tower offers for accepting the saturated gas entrance after purifier purification, the inside of described lower tower is provided with column plate, the top of described lower tower has the heat exchange fluid apertures for inputting heat exchange liquid, the top of described lower tower is provided with the pure nitrogen gas outlet for exporting pure nitrogen gas, and the outlet of described pure nitrogen gas is also associated with a nitrogen condenser to obtain pure liquid nitrogen.
2. pure liquid nitrogen preparation method according to claim 1, it is characterised in that described column plate has multiple, and multiple described column plates are longitudinally arranged, the heat exchanging holes on described column plate becomes larger to upper and lower side from middle.
3. pure liquid nitrogen preparation method according to claim 1, it is characterised in that the middle part of described lower tower is provided with dirty nitrogen outlet, and described dirty nitrogen outlet is connected to a dirty nitrogen filter, and the outlet of described dirty nitrogen filter is connected with the heat exchange fluid apertures of described lower top of tower.
4. pure liquid nitrogen preparation method according to claim 1, it is characterised in that described air filter is self-cleaning air filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410798312.1A CN105758117A (en) | 2014-12-19 | 2014-12-19 | Pure nitrogen preparation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410798312.1A CN105758117A (en) | 2014-12-19 | 2014-12-19 | Pure nitrogen preparation method |
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| CN105758117A true CN105758117A (en) | 2016-07-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111306891A (en) * | 2020-02-20 | 2020-06-19 | 济南诚信气体有限公司 | Preparation process of oxygen |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4698079A (en) * | 1984-07-13 | 1987-10-06 | Daidousanso Co., Ltd. | High-purity nitrogen gas production equipment |
| CN104061757A (en) * | 2014-07-07 | 2014-09-24 | 开封空分集团有限公司 | Liquid oxygen and liquid nitrogen preparation device and method |
| CN104110940A (en) * | 2014-06-19 | 2014-10-22 | 中国寰球工程公司 | Efficient air separation device utilizing liquefied natural gas cold energy |
| CN204006965U (en) * | 2014-07-07 | 2014-12-10 | 开封空分集团有限公司 | A kind of liquid oxygen and liquid nitrogen device for making |
-
2014
- 2014-12-19 CN CN201410798312.1A patent/CN105758117A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4698079A (en) * | 1984-07-13 | 1987-10-06 | Daidousanso Co., Ltd. | High-purity nitrogen gas production equipment |
| CN104110940A (en) * | 2014-06-19 | 2014-10-22 | 中国寰球工程公司 | Efficient air separation device utilizing liquefied natural gas cold energy |
| CN104061757A (en) * | 2014-07-07 | 2014-09-24 | 开封空分集团有限公司 | Liquid oxygen and liquid nitrogen preparation device and method |
| CN204006965U (en) * | 2014-07-07 | 2014-12-10 | 开封空分集团有限公司 | A kind of liquid oxygen and liquid nitrogen device for making |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111306891A (en) * | 2020-02-20 | 2020-06-19 | 济南诚信气体有限公司 | Preparation process of oxygen |
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