CN108759310A - A kind of small-sized deep cooling double tower equipment of making nitrogen and method - Google Patents

A kind of small-sized deep cooling double tower equipment of making nitrogen and method Download PDF

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Publication number
CN108759310A
CN108759310A CN201810656018.5A CN201810656018A CN108759310A CN 108759310 A CN108759310 A CN 108759310A CN 201810656018 A CN201810656018 A CN 201810656018A CN 108759310 A CN108759310 A CN 108759310A
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China
Prior art keywords
tower
rectifying column
nitrogen
air
under
Prior art date
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Pending
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CN201810656018.5A
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Chinese (zh)
Inventor
张育哲
孙自春
黄伟
贾伟
葛欣欣
张申
陈群
李敏
吕宝成
邝双
李松磊
王继超
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Zhejiang Zhihai Chemical Equipment Engineering Co Ltd
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Zhejiang Zhihai Chemical Equipment Engineering Co Ltd
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Priority to CN201810656018.5A priority Critical patent/CN108759310A/en
Publication of CN108759310A publication Critical patent/CN108759310A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04012—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
    • F25J3/04018—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of main feed 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
    • 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
    • F25J3/04163—Hot end purification of the feed air
    • F25J3/04169—Hot end purification of the feed air by adsorption of the impurities
    • 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
    • F25J3/044—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 single pressure main column system only
    • 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
    • F25J3/04775—Air purification and pre-cooling
    • 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
    • F25J3/04781—Pressure changing devices, e.g. for compression, expansion, liquid pumping
    • 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
    • F25J3/04787—Heat exchange, e.g. main heat exchange line; Subcooler, external 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
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/42—Nitrogen or special cases, e.g. multiple or low purity N2
    • 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
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/50—Oxygen or special cases, e.g. isotope-mixtures or low purity O2

Abstract

A kind of small-sized deep cooling double tower equipment of making nitrogen and method, it includes mainly the two-tower rectification tower of an air compressor, Precooling unit and separator, purifier and Shang Ta and lower tower composition；There is a main heat exchanger being connected to after purifier, air after cooling is sent into tower bottom under the rectifying column to connect with pipeline behind the main heat exchanger；By a part of nitrogen after rectifying, the tower top of tower under rectifying column picks out tower under rectifying column, and reversal connection enters main heat exchanger, to cool down after purification and be sent into the raw air of main heat exchanger；Part nitrogen re-heat after by main heat exchanger becomes product nitrogen gas；Under rectifying column tower by another part nitrogen after rectifying after the tower top of tower picks out under rectifying column with the intermediate condensation evaporator of tower bottom on pipe connection rectifying column, at liquid nitrogen after the condensation of intermediate condensation evaporator, a portion liquid nitrogen uses pipe to be sent to top of tower on the rectifying column of connection as the phegma of upper tower, and another part liquid nitrogen uses the top of the lower tower of pipe connection as phegma；It has structure composition reasonable, and use is easy to operate, it can be ensured that the features such as nitrogen high-efficiency low energy consumption processed.

Description

A kind of small-sized deep cooling double tower equipment of making nitrogen and method
Technical field
The present invention relates to a kind of follow-on small-sized deep cooling double tower equipment of making nitrogen and methods, belong to space division refrigeration low-temperature rectifying Technical field.
Background technology
Currently, as high-purity nitrogen is using more and more, therefore more producers start to prepare nitrogen using double-column process Gas, to ensure high-efficiency low energy consumption, but as a kind of new space division refrigeration low-temperature distillation process, double tower nitrogen also has many potentiality It can excavate.
Invention content
It is an object of the invention to overcome the shortcomings of the prior art, and one kind is provided on the basis of the existing equipment of making nitrogen It is improved, structure composition is reasonable, and use is easy to operate, it can be ensured that the small-sized deep cooling double tower nitrogen of nitrogen high-efficiency low energy consumption processed Equipment.
The purpose of the present invention is come what is completed, a kind of small-sized deep cooling double tower equipment of making nitrogen, it leads by following technical solution It to include the two-tower rectification tower of an air compressor, Precooling unit and separator, purifier and Shang Ta and lower tower composition；
There is a main heat exchanger being connected to after purifier, air after cooling feeding is connected with pipeline behind the main heat exchanger Tower bottom under rectifying column；
By a part of nitrogen after rectifying, the tower top of tower under rectifying column picks out tower under the rectifying column, and reversal connection enters main heat exchange Device, to cool down after purification and be sent into the raw air of main heat exchanger；Part nitrogen re-heat after by main heat exchanger becomes Product nitrogen gas；
Another part nitrogen after rectifying is connected essence after the tower top of tower picks out under rectifying column by tower with pipe under the rectifying column The intermediate condensation evaporator for evaporating tower bottom on tower, at liquid nitrogen, a portion liquid nitrogen after the condensation of intermediate condensation evaporator Using pipe to be sent to top of tower on the rectifying column of connection, as the phegma of upper tower, the top that another part liquid nitrogen pipe connects lower tower is made For phegma；
The oxygen-enriched liquid air of tower bottom enters the lower part of upper tower after subcooler supercooling throttling under rectifying column, as bottom intermediate condensation The low-temperature receiver of evaporator；Oxygen-enriched air after evaporation is in upper tower as products material；It is obtained on tower body top after tower rectifying on rectifying column To nitrogen upper tower top is picked by pipe upper condenser/evaporator in, after becoming liquid nitrogen after supercooling, in the case where being sent into rectifying column Top of tower makees phegma, and the rich solution oxygen that tower bottom rectifying obtains on rectifying column is connected to pipe on the upper condenser/evaporator of top of tower Face, through obtaining oxygen rich air with the nitrogen heat exchange evaporation in upper condenser/evaporator, the top extraction of oxygen rich air tower from rectifying column Afterwards, into main heat exchanger re-heat to design temperature cooling box, a part removes regenerating molecular sieve, some emptying.
As preferred：The cold overwhelming majority needed for the air separation and liquefaction is by tower under counter fill into rectifying column Liquid nitrogen provides；The product nitrogen gas of the output enters after product compressor compresses to required pressure；The product compressor and Air compressor is driven using same motor；The liquid nitrogen picked out from upper condenser/evaporator is to pass through low temperature liquid nitrogen pump It is sent into top of tower under rectifying column afterwards and makees phegma.
A method of nitrogen being produced using the small-sized deep cooling double tower equipment of making nitrogen, raw air adds through air compressor It is pressed onto 0.40MPa, pre-cooled unit and separator, raw air temperature is dropped to 8-10 DEG C or so, and in separator Separate moisture；
Processing air enters purifier, is adsorbed and removed remaining moisture content, carbon dioxide and hydrocarbon, goes out in purifier air Moisture dew point≤- 70 DEG C and carbon dioxide be less than 1PPm；
Purifying post-processing air enters ice chest, enters tower bottom under rectifying column after dew-point temperature is cooled in main heat exchanger；Essence A part of nitrogen for going out column overhead under rectifying column after evaporating reenters main heat exchanger, and while cooling raw air, itself is multiple Product nitrogen gas cooling box is used as after heat；Another part nitrogen overhead condenses in the intermediate condensation evaporator between Shang Ta and lower tower After liquid nitrogen, a part of liquid nitrogen is sent to reflux of the top of tower as lower tower under rectifying column；
The bottom of tower picks out oxygen-enriched liquid air under rectifying column, enters upper tower lower part after subcooler supercooling throttling, as intermediate condensation The low-temperature receiver of evaporator；Oxygen-enriched air after evaporation on rectifying column tower as products material；In tower body after tower rectifying on rectifying column After the nitrogen that top obtains picks upper condenser/evaporator supercooling by pipe, becomes top of tower under liquid nitrogen feeding rectifying column and flow back Liquid, the rich solution oxygen that tower bottom rectifying obtains on rectifying column is connected to the upper condenser/evaporator on tower top top with pipe, through auxiliary cold evaporation At the top of the upper condenser/evaporator of oxygen rich air tower from rectifying column after extraction, into main heat exchanger re-heat to design temperature cooling box, A part removes regenerating molecular sieve, some emptying.
The invention belongs to the improvement in prior art basis, it has structure composition reasonable, and use is easy to operate, can The features such as ensuring nitrogen high-efficiency low energy consumption processed.
Description of the drawings
Fig. 1 is the flow chart 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, a kind of small-sized deep cooling of the present invention is double The tower equipment of making nitrogen, it mainly include an air compressor C01, Precooling unit and separator AC, purifier MS1, MS2, and The two-tower rectification tower of upper tower K02 and lower tower K01 compositions；
There is a main heat exchanger E01 being connected to after purifier MS1, MS2, it will be after cooling with pipeline behind main heat exchanger E01 Air is sent into the bottoms tower K01 under the rectifying column to connect；
By a part of nitrogen after rectifying, the tower top of tower K01 under rectifying column picks out tower K01 under the rectifying column, and reversal connection is become owner of Heat exchanger E01, to cool down after purification and be sent into the raw air of main heat exchanger E01；The part nitrogen is passing through main heat exchanger Re-heat becomes product nitrogen gas after E01；
Under the rectifying column tower K01 by another part nitrogen after rectifying after the tower top of tower K01 picks out under rectifying column with pipe The intermediate condensation evaporator E02 for connecting the bottoms tower K02 on rectifying column, at liquid nitrogen after the condensation of intermediate condensation evaporator E02, A portion liquid nitrogen uses pipe to be sent to the phegma on the rectifying column of connection at the top of tower K02 as upper tower K02, another part liquid nitrogen Pipe is used to connect time top of tower K01 as phegma；
The oxygen-enriched liquid air of the bottoms tower K01 enters the lower part of upper tower K02 after subcooler E03 supercooling throttlings under rectifying column, the bottom of as The low-temperature receiver of portion intermediate condensation evaporator E02；Oxygen-enriched air after evaporation is in upper tower K02 as products material；Tower K02 on rectifying column In the upper condenser/evaporator E02 for picking the tops upper tower K02 after rectifying by pipe in the nitrogen that tower body top obtains, become after supercooling After liquid nitrogen, make phegma at the top of tower K01 in the case where being sent into rectifying column, the rich solution oxygen that tower K02 bottom rectifying obtains on rectifying column is used Pipe is connected to above the upper condenser/evaporator E02 of top of tower, oxygen-enriched through being obtained with the nitrogen heat exchange evaporation in upper condenser/evaporator E02 Gas, after the top extraction of oxygen rich air tower K02 from rectifying column, into main heat exchanger E04 re-heats to design temperature cooling box, one Regenerating molecular sieve is removed in part, some emptying.
The cold overwhelming majority needed for air separation and liquefaction of the present invention is by tower K01 under counter fill into rectifying column Liquid nitrogen provides；The product nitrogen gas of the output enters after product compressor NC01 compresses to required pressure；The product compression Machine NC01 and air compressor C01 is driven using same motor；The liquid nitrogen picked out from upper condenser/evaporator E02 be Make phegma by being sent into after low temperature liquid nitrogen pump under rectifying column at the top of tower K01.
A method of nitrogen being produced using the small-sized deep cooling double tower equipment of making nitrogen, raw air is through air compressor C01 is pressurized to 0.40MPa, pre-cooled unit and separator, raw air temperature is dropped to 8-10 DEG C or so, and detach in water Moisture is separated in device；
Processing air enters purifier, is adsorbed and removed remaining moisture content, carbon dioxide and hydrocarbon, goes out in purifier air Moisture dew point≤- 70 DEG C and carbon dioxide be less than 1PPm；
Purifying post-processing air enters ice chest, enters the bottoms tower K01 under rectifying column after dew-point temperature is cooled in main heat exchanger E01 Portion；A part of nitrogen for going out tower K01 tower tops under rectifying column after rectifying reenters main heat exchanger E01, in cooling raw air Meanwhile product nitrogen gas cooling box is used as after itself re-heat；Intermediate condensation of another part nitrogen overhead between Shang Ta and lower tower After being condensed into liquid nitrogen in evaporator E02, a part of liquid nitrogen is sent to the reflux at the top of tower K01 as lower tower K01 under rectifying column；
The bottom of tower K01 picks out oxygen-enriched liquid air under rectifying column, enters the lower parts upper tower K02 after subcooler E03 supercooling throttlings, as The low-temperature receiver of intermediate condensation evaporator E02；Oxygen-enriched air after evaporation on rectifying column tower K02 as products material；On rectifying column After picking upper condenser/evaporator E04 supercoolings by pipe in the nitrogen that tower body top obtains after tower K02 rectifying, become liquid nitrogen feeding Make phegma under rectifying column at the top of tower K01, the rich solution oxygen that tower K02 bottom rectifying obtains on rectifying column is connected to tower top top with pipe Upper condenser/evaporator E04, after extraction at the top of the upper condenser/evaporator E04 of the oxygen rich air of auxiliary cold evaporation tower from rectifying column, into Enter main heat exchanger E04 re-heats to design temperature cooling box, a part removes regenerating molecular sieve, some emptying.

Claims (3)

1. a kind of small-sized deep cooling double tower equipment of making nitrogen, it includes mainly an air compressor（C01）, Precooling unit and separator （AC）, purifier（MS1,MS2）And upper tower（K02）With lower tower（K01）The two-tower rectification tower of composition, it is characterised in that：
There is one to be connected to purifier（MS1,MS2）Main heat exchanger afterwards（E01）, the main heat exchanger（E01）It below will be cold with pipeline But the air after is sent into tower under the rectifying column to connect（K01）Bottom；
Tower under the rectifying column（K01）By a part of nitrogen after rectifying under rectifying column tower（K01）Tower top pick out, reversal connection Enter main heat exchanger（E01）, to cool down after purification and to be sent into main heat exchanger（E01）Raw air；The part nitrogen is passing through Main heat exchanger（E01）Re-heat becomes product nitrogen gas afterwards；
Tower under the rectifying column（K01）By another part nitrogen after rectifying under rectifying column tower（K01）Tower top pick out after With tower on pipe connection rectifying column（K02）The intermediate condensation evaporator of bottom（E02）, by intermediate condensation evaporator（E02）It is cold After solidifying tower on the rectifying column of connection is sent to pipe at liquid nitrogen, a portion liquid nitrogen（K02）Top is as upper tower（K02）Reflux Liquid, another part liquid nitrogen pipe connect lower tower（K01）Top as phegma；
Tower under rectifying column（K01）The oxygen-enriched liquid air of bottom is through subcooler（E03）Enter upper tower after supercooling throttling（K02）Lower part, As bottom intermediate condensation evaporator（E02）Low-temperature receiver；Oxygen-enriched air after evaporation is in Shang Ta（K02）As products material；Essence Evaporate tower on tower（K02）The nitrogen obtained on tower body top after rectifying is picked by pipe into upper tower（K02）The upper condensation evaporation on top Device（E02）In, after becoming liquid nitrogen after supercooling, the tower in the case where being sent into rectifying column（K01）Phegma is made at top, tower on rectifying column（K02） The rich solution oxygen that bottom rectifying obtains is connected to the upper condenser/evaporator of top of tower with pipe（E02）Above, through with upper condenser/evaporator （E02）In nitrogen heat exchange evaporation obtain oxygen rich air, oxygen rich air tower from rectifying column（K02）Top extraction after, into master Heat exchanger（E04）Re-heat to design temperature cooling box, a part removes regenerating molecular sieve, some emptying.
2. the small-sized deep cooling double tower equipment of making nitrogen according to claim 1, it is characterised in that the air separation and liquefaction The required cold overwhelming majority is by tower under counter fill into rectifying column（K01）Liquid nitrogen provide；The product nitrogen gas of the output enters Product compressor（NC01）To required pressure after compression；The product compressor（NC01）And air compressor（C01）Using Same motor drives；It is described from upper condenser/evaporator（E02）In the liquid nitrogen that picks out be that essence is sent into after by low temperature liquid nitrogen pump Evaporate Ta Xiata（K01）Make phegma in top.
3. a kind of utilizing the method that the small-sized deep cooling double tower equipment of making nitrogen produces nitrogen described in claims 1 or 22, it is characterised in that： Raw air is through air compressor（C01）It is pressurized to 0.40MPa, pre-cooled unit and separator, raw air temperature is dropped To 8-10 DEG C or so, and moisture is separated in separator；
Processing air enters purifier, is adsorbed and removed remaining moisture content, carbon dioxide and hydrocarbon, goes out in purifier air Moisture dew point≤- 70 DEG C and carbon dioxide be less than 1PPm；
Purifying post-processing air enters ice chest, in main heat exchanger（E01）In be cooled to after dew-point temperature and enter tower under rectifying column （K01）Bottom；Go out tower under rectifying column after rectifying（K01）A part of nitrogen of tower top reenters main heat exchanger（E01）, in cooling While raw air, product nitrogen gas cooling box is used as after itself re-heat；Another part nitrogen overhead is between Shang Ta and lower tower Intermediate condensation evaporator（E02）In be condensed into liquid nitrogen after, a part of liquid nitrogen is sent to tower under rectifying column（K01）Under top is used as Tower（K01）Reflux；
Tower under rectifying column（K01）Bottom pick out oxygen-enriched liquid air, through subcooler（E03）Enter upper tower after supercooling throttling（K02）Under Portion, as intermediate condensation evaporator（E02）Low-temperature receiver；Oxygen-enriched air after the evaporation tower on rectifying column（K02）As product original Material；Tower on rectifying column（K02）The nitrogen obtained on tower body top after rectifying is picked by pipe into upper condenser/evaporator（E04）Supercooling Afterwards, become liquid nitrogen and be sent into tower under rectifying column（K01）Phegma is made at top, tower on rectifying column（K02）The rich solution that bottom rectifying obtains Oxygen is connected to the upper condenser/evaporator on tower top top with pipe（E04）, the upper condensation of the tower from rectifying column of the oxygen rich air through auxiliary cold evaporation Evaporator（E04）After the extraction of top, into main heat exchanger（E04）To design temperature cooling box, a part removes molecular sieve again for re-heat It is raw, some emptying.
CN201810656018.5A 2018-06-23 2018-06-23 A kind of small-sized deep cooling double tower equipment of making nitrogen and method Pending CN108759310A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110038399A (en) * 2019-05-24 2019-07-23 中天钢铁集团有限公司 A kind of double-tower type compressed air cryodrying device
CN113606865A (en) * 2021-08-06 2021-11-05 苏州市兴鲁空分设备科技发展有限公司 Device and method for preparing liquid nitrogen through air separation

Citations (6)

* Cited by examiner, † Cited by third party
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