CN109838975A - A kind of low energy consumption liquid nitrogen device for making and technique - Google Patents
A kind of low energy consumption liquid nitrogen device for making and technique Download PDFInfo
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- CN109838975A CN109838975A CN201910221108.6A CN201910221108A CN109838975A CN 109838975 A CN109838975 A CN 109838975A CN 201910221108 A CN201910221108 A CN 201910221108A CN 109838975 A CN109838975 A CN 109838975A
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- Prior art keywords
- air
- heat exchanger
- evaporator
- nitrogen
- main heat
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 225
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 111
- 239000007788 liquid Substances 0.000 title claims abstract description 108
- 238000005265 energy consumption Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title description 5
- 239000002808 molecular sieve Substances 0.000 claims abstract description 29
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000007710 freezing Methods 0.000 claims abstract description 15
- 230000008014 freezing Effects 0.000 claims abstract description 15
- 238000000746 purification Methods 0.000 claims abstract description 9
- 238000009833 condensation Methods 0.000 claims abstract description 6
- 230000005494 condensation Effects 0.000 claims abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 37
- 239000001301 oxygen Substances 0.000 claims description 37
- 229910052760 oxygen Inorganic materials 0.000 claims description 37
- 238000001816 cooling Methods 0.000 claims description 27
- 239000002826 coolant Substances 0.000 claims description 20
- 238000003860 storage Methods 0.000 claims description 10
- 230000008676 import Effects 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 7
- 239000000428 dust Substances 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 4
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000008929 regeneration Effects 0.000 claims description 3
- 238000011069 regeneration method Methods 0.000 claims description 3
- 238000004781 supercooling Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000005329 float glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- F25J3/04248—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
- F25J3/04339—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 air
- F25J3/04345—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 air and comprising a gas work expansion loop
-
- 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
- F25J3/04278—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using external refrigeration units, e.g. closed mechanical or regenerative refrigeration units
-
- 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
- F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
-
- 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
- F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
- F25J3/04393—Details relating to the work expansion, e.g. process parameter etc. using multiple or multistage gas work expansion
-
- 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
- F25J3/04424—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 without thermally coupled high and low pressure columns, i.e. a so-called split columns
-
- 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
- F25J2270/00—Refrigeration techniques used
- F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
Landscapes
- 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 present invention discloses a kind of low energy consumption liquid nitrogen device for making, including filter, Turbine Air compressor, air precooling unit, the molecular sieve adsorber being used alternatingly, electric heater, freezing unit, circulation air compressor machine, main heat exchanger, rectifying column I, condenser/evaporator I, rectifying column II, condenser/evaporator II, subcooler, the first expanding machine, the second expanding machine, ice chest.The present invention is using air as raw material, and molecular sieve purification air presses air positive flowrate expansion to add the double condensation high-purity liquid nitrogen of low pressure dirt nitrogen stream backed expansion, double tower in, and plant energy consumption is low, nitrogen recovery rate is high.
Description
Technical field
The present invention relates to technical field of air separation, and in particular to a kind of low energy consumption liquid nitrogen device for making and technique.
Background technique
With flourishing for the industries such as electronics, porcelain industry, float glass, the demand to nitrogen is also continuously increased.Due to liquid
Nitrogen product, which has many advantages, such as that convenient storage, supply are convenient, guarantees quality, transfer efficiency is high is increasingly taken by the user, and market is latent
Power is very big.If being only not able to satisfy the demand in market by air separation plant byproduct, the application of full liquid air separation plant is
As a kind of trend.
Full liquid air separation plant production mainly uses cryogenic rectification separating technology, evaporates temperature using each component in air
They are separated and obtain liquid product by the difference of degree.The raw material of air separation plant is atmosphere, and main consumption is the energy, especially
It is more crucial to the height of full liquid space division energy consumption.Therefore, how energy consumption is further decreased in full liquid air separation plant
It is particularly important.
Summary of the invention
The object of the present invention is to provide a kind of low energy consumption liquid nitrogen device for making and techniques, so as to solve the deficiencies in the prior art.
The invention adopts the following technical scheme:
A kind of low energy consumption liquid nitrogen device for making, including filter, Turbine Air compressor, air precooling unit, alternating make
Molecular sieve adsorber, electric heater, freezing unit, circulation air compressor machine, main heat exchanger, rectifying column I, condenser/evaporator I, essence
Tower II, condenser/evaporator II, subcooler, the first expanding machine, the second expanding machine, ice chest are evaporated,
It is filter, Turbine Air compressor, air precooling unit, the molecular sieve adsorber being used alternatingly, electric heater, cold
Freeze unit, circulation air compressor machine, the first expanding machine pressurized end to be set to outside ice chest, main heat exchanger, rectifying column I, condenser/evaporator I, essence
It evaporates tower II, condenser/evaporator II, subcooler, the first expanding machine, the second expanding machine to be set in ice chest, condenser/evaporator I is set to essence
It evaporates on tower I, condenser/evaporator II is set on rectifying column II；
Filter, Turbine Air compressor, air precooling unit, the molecular sieve adsorber being used alternatingly are sequentially connected, and are handed over
It is connected respectively with main heat exchanger, the first expanding machine pressurized end for the outlet of the molecular sieve adsorber used, the first of main heat exchanger
Part coolant outlet is connected with freezing unit, and freezing unit is connected with main heat exchanger, the complete coolant outlet of the first of main heat exchanger
It is connected with the raw air import of the bottom rectifying column I；First expanding machine pressurized end and the first pressurization aftercooler connection, first increases
After cooler is connected with main heat exchanger, and the second part coolant outlet of main heat exchanger connect with freezing unit, freezing unit with
Main heat exchanger connection, the Part III coolant outlet of main heat exchanger and the connection of the first expanding machine, the first expanding machine and main heat exchanger
Connection, main heat exchanger are connected with circulation air compressor machine, recycle air compressor machine and the second pressurization aftercooler connection, cooling after the second pressurization
Device is connected to the molecular sieve adsorber outlet being used alternatingly, the raw material of the complete coolant outlet of main heat exchanger second and the bottom rectifying column I
Air intlet connects, on the connecting line of the raw air import of the complete coolant outlet of main heat exchanger second and the bottom rectifying column I
Equipped with throttle valve；
Nitrogen outlet at the top of rectifying column I is connected with condenser/evaporator I, and the liquid nitrogen outlet of condenser/evaporator I is respectively and smart
It evaporates at the top of tower I, subcooler connection, subcooler is connected with the outer liquid nitrogen storage tank of ice chest, the connection of subcooler and the outer liquid nitrogen storage tank of ice chest
Pipeline is equipped with throttle valve；
The liquid air outlet of the bottom rectifying column I is connected with subcooler, and subcooler is connected with condenser/evaporator I, subcooler and cold
The connecting line of solidifying evaporator I is equipped with throttle valve, and the oxygen-enriched air outlet of condenser/evaporator I, the liquid air of condenser/evaporator I go out
Mouth is connected with the material inlet of the bottom rectifying column II respectively；
Low-pressure nitrogen outlet at the top of rectifying column II is connected with condenser/evaporator II, and the low pressure liquid nitrogen of condenser/evaporator II goes out
Mouth is connected with liquid nitrogen storage tank outside the top rectifying column II, ice chest respectively；
The oxygen-enriched liquid air outlet of the bottom rectifying column II is connected with condenser/evaporator II, and the oxygen-rich liquid of the bottom rectifying column II is vacated
The connecting line of mouth and condenser/evaporator II are equipped with throttle valve, and the dirty nitrogen outlet of condenser/evaporator II is connected with subcooler,
Subcooler is connected with main heat exchanger, and re-heat outlet in main heat exchanger part is connected with the second expanding machine, the second expanding machine and main heat exchange
Device connection, main heat exchanger are connected with exhausting pipeline, electric heater outside ice chest respectively, and electric heater and the molecular sieve being used alternatingly are inhaled
Adnexa connection.
A kind of low energy consumption liquid nitrogen reparation technology, includes the following steps:
Step 1: after raw air is filtered dust and mechanical admixture, it will into Turbine Air compressor
Air is compressed to setting pressure；After enter in the molecular sieve adsorber that is used alternatingly after the pre-cooling of air precooling unit and purify；
Step 2: by after purification raw air and it is circularly-supercharged after air converge, partially be used for instrument air, remaining point
At two strands, one is cooling into main heat exchanger part, extraction, after deep freeze refrigerator is cooling, introduces main heat exchanger and continues to cool down
Rectifying is participated in containing the wet rear bottom rectifying column I that enters to saturation temperature and with certain；Another the first expanding machine of stock-traders' know-how pressurized end
It is cooling that main heat exchanger part is introduced after pressurization, extraction introduces main heat exchanger and continue to cool down, draw after deep freeze refrigerator is cooling
Portion of air enters the first expander, and air cooling box after main heat exchanger re-heat after expansion introduces circulation air compressor machine,
Raw air after circularly-supercharged and after purification converges to recycle, and another part air continues cool to saturation temperature deutomerite
Stream enters the bottom rectifying column I and participates in rectifying；
Step 3: air is separated into nitrogen and liquid air after rectifying column I rectifying, nitrogen introduces condenser/evaporator I and liquid air
Heat exchange, pressure nitrogen gas are condensed into liquid nitrogen, and part liquid nitrogen introduces rectifying column I as phegma, the supercooling of rest part liquid nitrogen, throttling
It is used as nitrogen products afterwards；Liquid air enters condenser/evaporator I after being subcooled, being throttled and nitrogen exchanges heat, and liquid air is vaporizated into oxygen-enriched sky
Gas, oxygen-enriched air and the part liquid air not being vaporized introduce rectifying column II and participate in rectifying；
Step 4: oxygen-enriched air and liquid air are separated into low-pressure nitrogen and oxygen-enriched liquid air, low pressure nitrogen after rectifying column II rectifying
Gas introduces condenser/evaporator II and oxygen-enriched liquid air heat exchange, and low-pressure nitrogen is condensed into low pressure liquid nitrogen, and part low pressure liquid nitrogen introduces essence
Tower II is evaporated as phegma, and rest part low pressure liquid nitrogen is as nitrogen products；Condenser/evaporator II is introduced after oxygen-enriched liquid air throttling
It exchanges heat with low-pressure nitrogen, oxygen-enriched liquid air is vaporizated into dirty nitrogen, and dirty nitrogen introduces the after subcooler, the re-heat of main heat exchanger part
Two expanders, enter main heat exchanger re-heat after expansion, cooling box after re-heat is partially heated as regeneration gas by electric heater
The molecular sieve adsorber being used alternatingly is introduced afterwards, remaining emptying.
Beneficial effects of the present invention:
1, for the present invention using air as raw material, molecular sieve purification air presses air positive flowrate expansion to add low pressure dirt nitrogen in
The double condensation high-purity liquid nitrogen of stream backed expansion, double tower, plant energy consumption is low, nitrogen recovery rate is high.
2, condenser/evaporator I is arranged using double condenser/evaporators in the present invention, because of oxygen content in liquid air in condenser/evaporator I
It is low compared with rectifying column II, in the case where rectifying column I rectifying pressure is constant, liquid air after can be improved into condenser/evaporator I throttling
Pressure, liquid air be distillated tower I top nitrogen evaporation after be directly entered rectifying column II；Therefore rectifying column II pressure improves, full
In the case where sufficient condenser/evaporator II heat exchange, pressure is also correspondinglyd increase after the throttling of rectifying column II bottom oxygen-enriched liquid air, and then enters
The dirty nitrogen pressure of second expanding machine correspondinglys increase, and swell refrigeration amount increases, and plant energy consumption reduces.
3, one raw air of the invention is drawn after the pressurization of the first expanding machine pressurized end, this strand of air pressure height passes through
Main heat exchanger backflowed gas cooling when easily liquefy, further decrease plant energy consumption.
Detailed description of the invention
Fig. 1 is apparatus of the present invention schematic diagram.
Specific embodiment
The present invention is done below with reference to embodiment and attached drawing and is further explained.The following example is merely to illustrate this hair
It is bright, but be not used to limit practical range of the invention.
A kind of low energy consumption liquid nitrogen device for making, as shown in Figure 1, including filter 1, Turbine Air compressor 2, air precooling
Unit 3, the molecular sieve adsorber 4 being used alternatingly, electric heater 5, freezing unit 14, circulation air compressor machine 15, main heat exchanger 6, essence
Evaporate tower I9, condenser/evaporator I10, rectifying column II11, condenser/evaporator II12, subcooler 13, the expansion of the first expanding machine 7, second
Machine 8, ice chest,
Filter 1, Turbine Air compressor 2, air precooling unit 3, the molecular sieve adsorber 4 being used alternatingly, electric heating
Device 5, freezing unit 14, circulation air compressor machine 15, the first expanding machine pressurized end 7-1 be set to ice chest outside, main heat exchanger 6, rectifying column I9,
Condenser/evaporator I10, rectifying column II11, condenser/evaporator II12, subcooler 13, the first expanding machine 7, the second expanding machine 8 are set to
In ice chest, condenser/evaporator I10 is set on rectifying column I9, and condenser/evaporator II12 is set on rectifying column II11；
Filter 1, Turbine Air compressor 2, air precooling unit 3, the molecular sieve adsorber 4 being used alternatingly successively connect
It connects, the outlet for the molecular sieve adsorber 4 being used alternatingly is connected with main heat exchanger 6, the first expanding machine pressurized end 7-1 respectively, and master changes
The first part's coolant outlet and freezing unit 14 of hot device 6 connect, and freeze unit 14 and main heat exchanger 6 connects, main heat exchanger 6
First complete coolant outlet is connected with the raw air import of the bottom rectifying column I9；First expanding machine pressurized end 7-1 and first increases
After cooler 16 connects, and the first pressurization aftercooler 16 and main heat exchanger 6 connect, and the second part cooling of main heat exchanger 6 goes out
Mouthful and freezing unit 14 connect, freeze unit 14 and main heat exchanger 6 and connect, the Part III coolant outlet of main heat exchanger 6 and the
The connection of one expanding machine 7, the first expanding machine 7 and main heat exchanger 6 connect, and main heat exchanger 6 and circulation air compressor machine 15 connect, and recycle pneumatics
Machine 15 and the second pressurization aftercooler 17 connect, and the second pressurization aftercooler 17 is connected to the molecular sieve adsorber 4 being used alternatingly and goes out
Mouthful, the complete coolant outlet of main heat exchanger 6 second is connected with the raw air import of the bottom rectifying column I9, and main heat exchanger 6 second is complete
The connecting line of the raw air import of full coolant outlet and the bottom rectifying column I9 is equipped with throttle valve；
Nitrogen outlet at the top of rectifying column I9 is connected with condenser/evaporator I10, and the liquid nitrogen of condenser/evaporator I10 exports difference
It is connected with the top rectifying column I9, subcooler 13, subcooler 13 is connected with the outer liquid nitrogen storage tank of ice chest, subcooler 13 and the outer liquid nitrogen of ice chest
The connecting line of storage tank is equipped with throttle valve；
The liquid air outlet of the bottom rectifying column I9 and subcooler 13 connect, and subcooler 13 is connected with condenser/evaporator I10, are subcooled
The connecting line of device 13 and condenser/evaporator I10 are equipped with throttle valve, and oxygen-enriched air outlet, the condensation of condenser/evaporator I10 is steamed
The liquid air outlet of hair device I10 is connected with the material inlet of the bottom rectifying column II11 respectively；
Low-pressure nitrogen outlet at the top of rectifying column II11 is connected with condenser/evaporator II12, the low pressure of condenser/evaporator II12
Liquid nitrogen outlet is connected with liquid nitrogen storage tank outside the top rectifying column II11, ice chest respectively；
The bottom rectifying column II11 oxygen-enriched liquid air outlet connected with condenser/evaporator II12, the bottom rectifying column II11 it is oxygen-enriched
The connecting line of liquid air outlet and condenser/evaporator II12 are equipped with throttle valve, the dirty nitrogen outlet and mistake of condenser/evaporator II12
Cooler 13 connects, and subcooler 13 and main heat exchanger 6 connect, 6 part re-heat of main heat exchanger outlet and the connection of the second expanding machine 8, the
Two expanding machines 8 and main heat exchanger 6 connect, and main heat exchanger 6 is connected with exhausting pipeline, electric heater 5 outside ice chest respectively, electric heater
5 connect with the molecular sieve adsorber 4 being used alternatingly.
The function of above-mentioned each component is as follows:
Filter 1, for the dust and mechanical admixture in filter stock air；
Turbine Air compressor 2, for filtered raw air to be compressed to setting pressure；
Air precooling unit 3 is used to filter, the pre-cooling of compressed raw air；
The molecular sieve adsorber 4 being used alternatingly goes to remove water for the raw air purifying after filtering, and compressing, be pre-chilled
Divide, CO2、C2H2Equal substances；
Electric heater 5, for heating dirty nitrogen with regenerated molecular sieve absorber 4；
Main heat exchanger 6, for by after purification raw air and it is circularly-supercharged after air it is cooling, will be through 13 re-heat of subcooler
Dirty nitrogen partial re-heat afterwards, by the air after the expansion of the first expanding machine 7, the dirty nitrogen re-heat after the expansion of the second expanding machine 8；
First expanding machine 7 is produced cold for expanding the part cooling air of 6 Part III coolant outlet of main heat exchanger
Amount；
Second expanding machine 8, for producing cooling capacity for the dirty nitrogen expansion through subcooler 13,6 part re-heat of main heat exchanger；
Rectifying column I9, for raw air rectifying to be separated into nitrogen and liquid air；
Condenser/evaporator I10 exchanges heat for nitrogen and liquid air, and nitrogen is liquefied as liquid nitrogen, and liquid air is vaporizated into oxygen-enriched sky
Gas；
Rectifying column II11, for oxygen-enriched air and liquid air rectifying to be separated into low-pressure nitrogen and oxygen-enriched liquid air；
Condenser/evaporator II12 exchanges heat for low-pressure nitrogen and oxygen-enriched liquid air, and low-pressure nitrogen is liquefied as low pressure liquid nitrogen, richness
Oxygen liquid air is vaporizated into dirty nitrogen；
Subcooler 13 is subcooled for liquid air, liquid nitrogen, for dirty nitrogen re-heat；
Unit 14 is freezed, the part for 6 first part's coolant outlet of main heat exchanger, second part coolant outlet is cooling empty
Air cooling；
Air compressor machine 15 is recycled, for that will be pressurized through the air circulation after the first expander, main heat exchanger re-heat.
A kind of low energy consumption liquid nitrogen reparation technology, includes the following steps:
Step 1: by raw air after filter 1 filters out dust and mechanical admixture, into Turbine Air compressor 2
Air is compressed to setting pressure 1.0-1.3MPa；After enter after air precooling unit 3 is cooled to 5-8 DEG C in advance and be used alternatingly
It is purified in molecular sieve adsorber 4, removes moisture removal, CO2、C2H2Equal substances；
Step 2: by after purification raw air and it is circularly-supercharged after air converge, sub-fraction for instrument air (figure
In do not illustrate), remaining is divided into two strands, one enter 6 part of main heat exchanger be cooled to about 251K, extract out, through deep freeze refrigerator
After 14 coolings, introduces main heat exchanger 6 and continue cool to saturation temperature and join with certain containing the wet rear bottom rectifying column I9 that enters
With rectifying；6 part of main heat exchanger is introduced after another stock-traders' know-how the first expanding machine pressurized end 7-1 pressurization and is cooled to about 251K, is extracted out, warp
It after deep freeze refrigerator 14 is cooling, introduces main heat exchanger 6 and continues to cool down, draw portion of air and expanded into the first expanding machine 7, it is swollen
Air cooling box after 6 re-heat of main heat exchanger after swollen introduces circulation air compressor machine 15, raw air after circularly-supercharged and after purification
Converge to recycle, another part air continues cool to saturation temperature deutomerite stream and enters the participation rectifying of the bottom rectifying column I9；
Step 3: air is separated into nitrogen and liquid air after rectifying column I9 rectifying, nitrogen introduces condenser/evaporator I10 and liquid
Sky heat exchange, pressure nitrogen gas are condensed into liquid nitrogen, and part liquid nitrogen introduces rectifying column I9 and is used as phegma, rest part liquid nitrogen is subcooled,
Nitrogen products are used as after throttling；Liquid air enters condenser/evaporator I10 after being subcooled, being throttled and nitrogen exchanges heat, and liquid air is vaporizated into
Oxygen-enriched air, oxygen-enriched air and the part liquid air not being vaporized introduce rectifying column II11 and participate in rectifying；
Step 4: oxygen-enriched air and liquid air are separated into low-pressure nitrogen and oxygen-enriched liquid air, low pressure after rectifying column II11 rectifying
Nitrogen introduces condenser/evaporator II12 and oxygen-enriched liquid air heat exchange, and low-pressure nitrogen is condensed into low pressure liquid nitrogen, and part low pressure liquid nitrogen draws
Enter rectifying column II11 as phegma, rest part low pressure liquid nitrogen is as nitrogen products；Condensation is introduced after oxygen-enriched liquid air throttling to steam
Device II12 and low-pressure nitrogen heat exchange are sent out, oxygen-enriched liquid air is vaporizated into dirty nitrogen, and dirty nitrogen is through subcooler 13,6 part of main heat exchanger
The expansion of the second expanding machine 8 is introduced after re-heat, 6 re-heat of main heat exchanger is entered after expansion, and cooling box after re-heat is partially used as regeneration gas
The molecular sieve adsorber 4 being used alternatingly is introduced after being heated by electric heater 5, remaining emptying.
Claims (2)
1. a kind of low energy consumption liquid nitrogen device for making, which is characterized in that including filter, Turbine Air compressor, air precooling machine
Group, the molecular sieve adsorber being used alternatingly, electric heater, freezing unit, circulation air compressor machine, main heat exchanger, rectifying column I, condensation
Evaporator I, rectifying column II, condenser/evaporator II, subcooler, the first expanding machine, the second expanding machine, ice chest,
Filter, Turbine Air compressor, air precooling unit, the molecular sieve adsorber being used alternatingly, electric heater, refrigerator
Group, circulation air compressor machine, the first expanding machine pressurized end are set to outside ice chest, main heat exchanger, rectifying column I, condenser/evaporator I, rectifying column
II, condenser/evaporator II, subcooler, the first expanding machine, the second expanding machine are set in ice chest, and condenser/evaporator I is set to rectifying column I
On, condenser/evaporator II is set on rectifying column II；
Filter, Turbine Air compressor, air precooling unit, the molecular sieve adsorber being used alternatingly are sequentially connected, and alternating makes
The outlet of molecular sieve adsorber is connected with main heat exchanger, the first expanding machine pressurized end respectively, the first part of main heat exchanger
Coolant outlet is connected with freezing unit, and freezing unit is connected with main heat exchanger, the complete coolant outlet of the first of main heat exchanger and essence
Evaporate the raw air import connection of the bottom tower I；First expanding machine pressurized end and the first pressurization aftercooler connection, after the first pressurization
Cooler is connected with main heat exchanger, and the second part coolant outlet of main heat exchanger is connected with freezing unit, and freezing unit and master change
Hot device connection, the Part III coolant outlet of main heat exchanger and the connection of the first expanding machine, the first expanding machine are connected with main heat exchanger,
Main heat exchanger is connected with circulation air compressor machine, recycles air compressor machine and the second pressurization aftercooler connection, and the second pressurization aftercooler connects
To the molecular sieve adsorber outlet being used alternatingly, the raw air of the complete coolant outlet of main heat exchanger second and the bottom rectifying column I
Import connection, the connecting line of the raw air import of the complete coolant outlet of main heat exchanger second and the bottom rectifying column I are equipped with
Throttle valve；
Nitrogen outlet at the top of rectifying column I is connected with condenser/evaporator I, the outlet of the liquid nitrogen of condenser/evaporator I respectively with rectifying column I
Top, subcooler connection, subcooler are connected with the outer liquid nitrogen storage tank of ice chest, on the connecting line of subcooler and the outer liquid nitrogen storage tank of ice chest
Equipped with throttle valve；
The liquid air outlet of the bottom rectifying column I is connected with subcooler, and subcooler is connected with condenser/evaporator I, and subcooler and condensation are steamed
The connecting line for sending out device I is equipped with throttle valve, and the oxygen-enriched air outlet of condenser/evaporator I, the liquid air outlet of condenser/evaporator I divide
Not connected with the material inlet of the bottom rectifying column II；
Low-pressure nitrogen outlet at the top of rectifying column II is connected with condenser/evaporator II, the low pressure liquid nitrogen outlet point of condenser/evaporator II
It is not connected with the top rectifying column II, the outer liquid nitrogen storage tank of ice chest；
The oxygen-enriched liquid air outlet of the bottom rectifying column II connect with condenser/evaporator II, the oxygen-enriched liquid air of the bottom rectifying column II export with
The connecting line of condenser/evaporator II is equipped with throttle valve, and the dirty nitrogen outlet of condenser/evaporator II is connected with subcooler, is subcooled
Device is connected with main heat exchanger, and re-heat outlet in main heat exchanger part is connected with the second expanding machine, and the second expanding machine and main heat exchanger connect
It connects, main heat exchanger is connected with exhausting pipeline, electric heater outside ice chest respectively, electric heater and the molecular sieve adsorber being used alternatingly
Connection.
2. a kind of low energy consumption liquid nitrogen reparation technology, which comprises the steps of:
Step 1: after raw air is filtered dust and mechanical admixture, into Turbine Air compressor by air
It is compressed to setting pressure；After enter in the molecular sieve adsorber that is used alternatingly after the pre-cooling of air precooling unit and purify；
Step 2: by after purification raw air and it is circularly-supercharged after air converge, partially be used for instrument air, remaining is divided into two
Stock, one is cooling into main heat exchanger part, extraction, and after deep freeze refrigerator is cooling, introducing main heat exchanger continues cool to full
Rectifying is participated in containing the wet rear bottom rectifying column I that enters with temperature and with certain；Another stock-traders' know-how the first expanding machine pressurized end pressurization
It is cooling that main heat exchanger part is introduced afterwards, and extraction introduces main heat exchanger and continue to cool down, draw one after deep freeze refrigerator is cooling
Air is divided to enter the first expander, air cooling box after main heat exchanger re-heat after expansion introduces circulation air compressor machine, circulation
Raw air after pressurization and after purification converges to recycle, and another part air continues cool to saturation temperature deutomerite and flows into
Enter the bottom rectifying column I and participates in rectifying；
Step 3: air is separated into nitrogen and liquid air after rectifying column I rectifying, nitrogen introduces condenser/evaporator I and liquid air heat exchange,
Pressure nitrogen gas is condensed into liquid nitrogen, and part liquid nitrogen introduces rectifying column I as phegma, makees after the supercooling of rest part liquid nitrogen, throttling
For nitrogen products；Liquid air enters condenser/evaporator I after being subcooled, being throttled and nitrogen exchanges heat, and liquid air is vaporizated into oxygen-enriched air, rich
Oxygen air and the part liquid air not being vaporized introduce rectifying column II and participate in rectifying；
Step 4: oxygen-enriched air and liquid air are separated into low-pressure nitrogen and oxygen-enriched liquid air after rectifying column II rectifying, low-pressure nitrogen draws
Enter condenser/evaporator II and oxygen-enriched liquid air heat exchange, low-pressure nitrogen is condensed into low pressure liquid nitrogen, and part low pressure liquid nitrogen introduces rectifying column
II is as phegma, and rest part low pressure liquid nitrogen is as nitrogen products；Condenser/evaporator II and low is introduced after oxygen-enriched liquid air throttling
Nitrogen heat exchange is pressed, oxygen-enriched liquid air is vaporizated into dirty nitrogen, and it is swollen that dirty nitrogen introduces second after subcooler, the re-heat of main heat exchanger part
Swollen machine expansion, enters main heat exchanger re-heat after expansion, cooling box after re-heat draws after partially being heated as regeneration gas by electric heater
Enter the molecular sieve adsorber being used alternatingly, remaining emptying.
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