CN109442867A - A kind of interior purity nitrogen device for making and the method for liquefying of novel outer pressurization - Google Patents
A kind of interior purity nitrogen device for making and the method for liquefying of novel outer pressurization Download PDFInfo
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- CN109442867A CN109442867A CN201811567023.5A CN201811567023A CN109442867A CN 109442867 A CN109442867 A CN 109442867A CN 201811567023 A CN201811567023 A CN 201811567023A CN 109442867 A CN109442867 A CN 109442867A
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- Prior art keywords
- rectifying column
- evaporator
- condenser
- nitrogen
- air
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 276
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title description 9
- 239000007788 liquid Substances 0.000 claims abstract description 80
- 239000002808 molecular sieve Substances 0.000 claims abstract description 24
- 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 24
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 48
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 21
- 239000001301 oxygen Substances 0.000 claims description 21
- 229910052760 oxygen Inorganic materials 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 19
- 239000000428 dust Substances 0.000 claims description 4
- 238000000746 purification Methods 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 230000008676 import Effects 0.000 claims description 2
- 230000008929 regeneration Effects 0.000 claims description 2
- 238000011069 regeneration method Methods 0.000 claims description 2
- 238000004781 supercooling Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000005057 refrigeration Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract 1
- 239000000126 substance Substances 0.000 description 3
- 238000007906 compression Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000009286 beneficial 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
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008961 swelling Effects 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
- F25J3/0228—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 characterised by the separated product stream
- F25J3/028—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 characterised by the separated product stream separation of noble gases
- F25J3/029—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 characterised by the separated product stream separation of noble gases of helium
-
- 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
- F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
- F25J3/04157—Afterstage cooling and so-called "pre-cooling" of the feed air upstream the air purification unit and main heat exchange line
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- 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
- F25J3/04412—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 in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
-
- 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
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/40—Features relating to the provision of boil-up in the bottom of a column
-
- 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
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/52—Processes or apparatus involving steps for increasing the pressure of gaseous process streams the fluid being oxygen enriched compared to air, e.g. "crude oxygen"
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 interior purity nitrogen device for making that liquefies of novel outer pressurization, including filter, Turbine Air compressor, air precooling unit, the molecular sieve adsorber being used alternatingly, electric heater, main heat exchanger, booster expansion machine, rectifying column I, rectifying column II, condenser/evaporator I, condenser/evaporator II, subcooler, liquefier, supercharger.Invention additionally discloses the purity nitrogen preparation methods that liquefies in a kind of novel outer pressurization.The present invention is using dirty nitrogen stream backed expansion refrigeration, and pressure utilization efficiency is high, and plant energy consumption is low；Using double tower parallel connection nitrogen, upper tower pressure can be higher or lower than lower pressure tower, can produce two kinds of nitrogen products with pressure rating or different pressure levels simultaneously, and can produce part liquid nitrogen product；Liquefier and external pressurization machine, outer supercharger are located at outside ice chest in being arranged, and convenient for safeguarding and maintenance, interior liquefier are located at cold box interior, and refrigerating loss is small, while because outer supercharger is unrestricted in type selecting, therefore application range of the invention can be significantly greatly increased.
Description
Technical field
The present invention relates to technical field of air separation, and in particular in a kind of novel outer pressurization liquefaction purity nitrogen device for making and
Method.
Background technique
As the industry technologies such as chemical industry, electronics, new material, porcelain steel industry, glass develop and reform, rapidly to nitrogen demand
Increase, while higher requirements are also raised to nitrogen gas purity.
Common purity nitrogen equipment currently on the market is divided into two kinds: single column nitrogen and double tower nitrogen.Single column nitrogen smoothness can
Produce the product nitrogen gas of certain pressure directly for users to use, although this kind of Process flow structure is simple, device recovery rate compared with
Low, unit consumption of product is high, is not suitable for the extensive demand for using nitrogen amount；Double tower nitrogen is divided into normal pressure nitrogen and nitrogen under pressure stream again
Journey, normal pressure nitrogen process can produce normal pressure nitrogen or pressure is the low-pressure nitrogen of 0.1-0.2MpaG, and device recovery rate is high, energy
Consumption is low compared with single column nitrogen, but since product pressure is lower, product nitrogen gas needs just to be able to satisfy use after nitrogen compressor compresses
Requirement of the family to nitrogen pressure, nitrogen under pressure process is generally band liquid nitrogen pump process, for nitrogen amount < 4500Nm3The space division of/h
Device, liquid nitrogen pump selection is relatively difficult, simultaneously as liquid nitrogen pump is typically placed in cold box interior, once liquid nitrogen failure of pump, it is necessary to
Sand is taken off to ice chest, therefore is typically chosen imported liquid pump in the configuration of liquid nitrogen pump, and the using and the reserved.
Summary of the invention
The object of the present invention is to provide purity nitrogen device for making and the methods of liquefying in a kind of novel outer pressurization, to solve existing skill
The deficiency of art.
The invention adopts the following technical scheme:
A kind of interior purity nitrogen device for making that liquefies of novel outer pressurization, including filter, Turbine Air compressor, air precooling machine
Group, the molecular sieve adsorber being used alternatingly, electric heater, main heat exchanger, booster expansion machine, rectifying column I, rectifying column II, condensation
Evaporator I, condenser/evaporator II, subcooler, liquefier, supercharger,
Filter, Turbine Air compressor, air precooling unit, the molecular sieve adsorber being used alternatingly, electric heater, increasing
Press be set to ice chest outside, main heat exchanger, booster expansion machine, rectifying column I, rectifying column II, condenser/evaporator I, condenser/evaporator II,
Subcooler, liquefier are set in ice chest, and condenser/evaporator I is set to above rectifying column I, and condenser/evaporator II is set on rectifying column II
Side；
Filter, Turbine Air compressor, air precooling unit, the molecular sieve adsorber being used alternatingly are sequentially connected, and are handed over
It is connected for the molecular sieve adsorber used with main heat exchanger, main heat exchanger is connected with the raw air import of the bottom rectifying column I；
Pressure nitrogen gas outlet at the top of rectifying column I is connected with main heat exchanger, condenser/evaporator I respectively, main heat exchanger connection
External pipe is to provide pressure nitrogen gas product；The liquid nitrogen outlet of condenser/evaporator I respectively at the top of rectifying column I, liquid nitrogen outside ice chest
Storage tank connection, wherein liquid nitrogen outlet and the connecting line at the top of rectifying column I of condenser/evaporator I is equipped with angie type low temperature valve；
The liquid air outlet of the bottom rectifying column I is connected with subcooler, and subcooler connects with condenser/evaporator I, rectifying column II respectively
It connects, the connecting line of subcooler and condenser/evaporator I is equipped with throttle valve, and the connecting line of subcooler and rectifying column II are equipped with
Throttle valve；The dirty nitrogen outlet of condenser/evaporator I is connected with liquefier, and liquefier is connected with supercharger, supercharger again and liquefaction
Device connection, liquefier are connected with the bottom rectifying column II, and liquefier and rectifying column II bottom connecting line are equipped with throttle valve；
Pressure nitrogen gas outlet at the top of rectifying column II is connected with main heat exchanger, condenser/evaporator II respectively, and main heat exchanger connects
External pipe is connect to provide pressure nitrogen gas product, is connected at the top of the liquid nitrogen outlet of condenser/evaporator II and rectifying column II；
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
Mouth and condenser/evaporator II connecting line are equipped with throttle valve, and the dirty nitrogen outlet of condenser/evaporator II is connected with subcooler, mistake
Cooler is connected with main heat exchanger, and the re-heat outlet of main heat exchanger part is connected with booster expansion machine, booster expansion machine and main heat exchanger
Connection, main heat exchanger are connected with electric heater, external exhausting pipeline respectively, electric heater and the molecular sieve adsorber being used alternatingly
Connection.
A kind of interior purity nitrogen preparation method that liquefies of novel outer pressurization, 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: raw air part after purification is used for instrument air, remaining enters main heat exchanger and is cooled to saturation
And with centainly containing wet rear into the participation rectifying of the bottom rectifying column I；
Step 3: air is separated into pressure nitrogen gas and liquid air after rectifying column I rectifying；Pressure nitrogen gas is divided into two strands, one
Directly leading out the cooling box after main heat exchanger re-heat, as product for user, another gang of introducing condenser/evaporator I and liquid air change
Heat, pressure nitrogen gas are condensed into liquid nitrogen, and for extension liquid nitrogen as product for user, remaining introduces rectifying column I as phegma；
Liquid air is divided into two strands after subcooler is subcooled, and rectifying column II is introduced after one throttling and participates in rectifying, is entered after another meropodium stream cold
Solidifying evaporator I is as cold source and pressure nitrogen gas heat exchange, and liquid air is vaporizated into dirty nitrogen, dirty nitrogen cooling box after liquefier re-heat,
Liquefier is returned to after supercharger is pressurized, dirty nitrogen and dirty nitrogen carry out heat exchange after pressurization, and dirty nitrogen is by part liquid after pressurization
Change, rectifying column II is introduced after throttling and participates in rectifying；
Step 4: the liquid air that the dirty nitrogen and rectifying column I of partial liquefaction introduce be separated into after rectifying column II rectifying it is oxygen-enriched
Liquid air and pressure nitrogen gas, pressure nitrogen gas are divided into two strands, one directly leads out after main heat exchanger re-heat cooling box as product
For user, another gang of introducing condenser/evaporator II and oxygen-enriched liquid air heat exchange, pressure nitrogen gas are condensed into liquid nitrogen, and liquid nitrogen introduces rectifying
Tower II is as phegma；Oxygen-enriched liquid air introduces condenser/evaporator II after throttling and exchanges heat as cold source and pressure nitrogen gas, oxygen-rich liquid
Sky is vaporizated into dirty nitrogen by pressure nitrogen gas, and dirty nitrogen introduces booster expansion machine after subcooler re-heat, the re-heat of main heat exchanger part
Ice chest institute chilling requirement is produced in expansion, and dirty nitrogen cooling box after main heat exchanger is compound after expansion is partially added as regeneration gas by electricity
The molecular sieve adsorber being used alternatingly is introduced after hot device heating, remaining emptying.
Beneficial effects of the present invention:
The present invention is using dirty nitrogen stream backed expansion refrigeration, and pressure utilization efficiency is high, and plant energy consumption is low.
The present invention uses double tower parallel connection nitrogen, and upper tower pressure can be higher or lower than lower pressure tower, can produce two kinds simultaneously together
The nitrogen product of pressure rating or different pressure levels, and part liquid nitrogen product can be produced.
The present invention is provided with interior liquefier and external pressurization machine, and outer supercharger is arranged outside ice chest, convenient for safeguarding and inspection
It repairs, interior liquefier is arranged in cold box interior, and refrigerating loss is small, while because outer supercharger is unrestricted in type selecting, therefore can be very big
Increase application range of the invention.
Detailed description of the invention
Fig. 1 is schematic structural diagram of the device of the invention.
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 interior purity nitrogen device for making that liquefies of novel outer pressurization, including filter 1, Turbine Air compressor 2, air precooling
Unit 3, the molecular sieve adsorber 4 being used alternatingly, electric heater 5, main heat exchanger 6, booster expansion machine 7, rectifying column I8, rectifying column
II9, condenser/evaporator I10, condenser/evaporator II11, subcooler 12, liquefier 13, supercharger 14,
Filter 1, Turbine Air compressor 2, air precooling unit 3, the molecular sieve adsorber 4 being used alternatingly, electric heating
Device 5, supercharger 14 are set to outside ice chest, main heat exchanger 6, booster expansion machine 7, rectifying column I8, rectifying column II9, condenser/evaporator
I10, condenser/evaporator II11, subcooler 12, liquefier 13 are set in ice chest, and condenser/evaporator I10 is set to above rectifying column I8,
Condenser/evaporator II11 is set to above rectifying column II9；
Filter 1, Turbine Air compressor 2, air precooling unit 3, the molecular sieve adsorber 4 being used alternatingly successively connect
Connect, the connection of the molecular sieve adsorber 4 and main heat exchanger 6 that are used alternatingly, the raw air of main heat exchanger 6 and the bottom rectifying column I8 into
Mouth connection；
Pressure nitrogen gas outlet at the top of rectifying column I8 is connected with main heat exchanger 6, condenser/evaporator I10 respectively, main heat exchanger 6
External pipe is connected to provide pressure nitrogen gas product；The liquid nitrogen outlet of condenser/evaporator I10 respectively at the top of rectifying column I8, ice chest
Outer liquid nitrogen storage tank connection, wherein liquid nitrogen outlet and the connecting line at the top of rectifying column I8 of condenser/evaporator I10 is equipped with angle
Formula low temperature valve；
The bottom rectifying column I8 liquid air outlet and subcooler 12 connect, subcooler 12 respectively with condenser/evaporator I10, rectifying
The connecting line of tower II9 connection, subcooler 12 and condenser/evaporator I8 are equipped with throttle valve, subcooler 12 and rectifying column II9's
Connecting line is equipped with throttle valve；The dirty nitrogen outlet and liquefier 13 of condenser/evaporator I10 connects, liquefier 13 and supercharger
14 connections, supercharger 14 are connected with liquefier 13 again, and liquefier 13 is connected with the bottom rectifying column II9, liquefier 13 and rectifying column
The bottom II9 connecting line is equipped with throttle valve；
Pressure nitrogen gas outlet at the top of rectifying column II9 is connected with main heat exchanger 6, condenser/evaporator II11 respectively, main heat exchange
Device 6 connects external pipe to provide pressure nitrogen gas product, connects at the top of the liquid nitrogen outlet of condenser/evaporator II11 and rectifying column II9
It connects；
The oxygen-enriched liquid air outlet of the bottom rectifying column II9 is connected with condenser/evaporator II11, the oxygen-rich liquid of the bottom rectifying column II9
Air Export and condenser/evaporator II11 connecting line are equipped with throttle valve, the dirty nitrogen outlet and subcooler of condenser/evaporator II11
12 connections, subcooler 12 and main heat exchanger 6 connect, and 6 part re-heat outlet of main heat exchanger and booster expansion machine 7 connect, and are pressurized swollen
Swollen machine 7 and main heat exchanger 6 connect, and main heat exchanger 6 is connected with electric heater 5, external exhausting pipeline respectively, electric heater 5 and friendship
It is connected for the molecular sieve adsorber 4 used.
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；
Main heat exchanger 6, raw air for that will filter, and compress, and be pre-chilled, after purification is cooling, by the pressure of rectifying column I8
Dirty nitrogen re-heat after nitrogen, the pressure nitrogen gas of rectifying column II9, expansion, by the dirty nitrogen partial re-heat after 12 re-heat of subcooler；
Booster expansion machine 7, for the dirty nitrogen expansion after 6 part re-heat of main heat exchanger to be produced the required cooling capacity of ice chest；
Rectifying column I8, for will through filtering, compression, pre-cooling, purifying, raw air cryogenic rectification after cooling and be separated into
Pressure nitrogen gas and liquid air；
Rectifying column II9, for the liquid air rectifying of the dirty nitrogen of partial liquefaction and rectifying column I8 introducing to be separated into oxygen-enriched
Liquid air and pressure nitrogen gas；
Condenser/evaporator I10, for by the pressure nitrogen gas of rectifying column I8 and liquid air heat exchange, pressure nitrogen gas to be condensed into liquid
Nitrogen, liquid air are vaporizated into dirty nitrogen；
Condenser/evaporator II11, for by the pressure nitrogen gas of rectifying column II9 and oxygen-enriched liquid air heat exchange, pressure nitrogen gas to be condensed
For liquid nitrogen, oxygen-enriched liquid air is vaporizated into dirty nitrogen；
Subcooler 12, for liquid air to be subcooled, by the dirty nitrogen re-heat of condenser/evaporator II11；
Liquefier 13, for by the dirty nitrogen re-heat of condenser/evaporator I10, dirty nitrogen partial to liquefy after pressurization；
Supercharger 14, for will be through the dirty nitrogen supercharging after 13 re-heat of liquefier.
A kind of interior purity nitrogen preparation method that liquefies of novel outer pressurization, 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 0.4-1.5MpaA；After after air precooling unit 3 is cooled to 5-8 DEG C in advance enter be used alternatingly
Molecular sieve adsorber 4 in purify, remove moisture removal, CO2、C2H2Equal substances；
Step 2: raw air part after purification is used for instrument air (not indicating in figure), remaining enters main heat exchange
Device 6, which is cooled to, to be saturated and participates in rectifying with the wet rear bottom rectifying column I8 that enters centainly is contained；
Step 3: air is separated into pressure nitrogen gas and liquid air after rectifying column I8 rectifying；Pressure nitrogen gas is divided into two strands, one
Cooling box is directly led out after 6 re-heat of main heat exchanger as product for user, another gang of introducing condenser/evaporator I10 and liquid air
Heat exchange, pressure nitrogen gas are condensed into liquid nitrogen, and for extension liquid nitrogen as product for user, remaining introduces rectifying column I8 as reflux
Liquid；Liquid air is divided into two strands after the supercooling of subcooler 12, introducing rectifying column II9 participation rectifying after one throttling, after another meropodium stream
It exchanges heat into condenser/evaporator I10 as cold source and pressure nitrogen gas, liquid air is vaporizated into dirty nitrogen, and dirty nitrogen is through 13 re-heat of liquefier
Cooling box afterwards returns to liquefier 13 after the pressurization of supercharger 14, and dirty nitrogen and dirty nitrogen carry out heat exchange after pressurization, dirty after pressurization
Nitrogen introduces rectifying column II9 by partial liquefaction, after throttling and participates in rectifying；
Step 4: the liquid air that the dirty nitrogen and rectifying column I8 of partial liquefaction introduce is separated into richness after rectifying column II9 rectifying
Oxygen liquid air and pressure nitrogen gas, pressure nitrogen gas are divided into two strands, one directly leads out the cooling box after 6 re-heat of main heat exchanger and is used as production
Product are condensed into liquid nitrogen for user, another gang of introducing condenser/evaporator II11 and oxygen-enriched liquid air heat exchange, pressure nitrogen gas, and liquid nitrogen introduces
Rectifying column II9 is as phegma；Oxygen-enriched liquid air introduces condenser/evaporator II11 after throttling and exchanges heat as cold source and pressure nitrogen gas,
Oxygen-enriched liquid air is vaporizated into dirty nitrogen by pressure nitrogen gas, and dirty nitrogen introduces increasing after 12 re-heat of subcooler, 6 part re-heat of main heat exchanger
Ice chest institute chilling requirement is produced in the expansion of compression swelling machine 7, dirty nitrogen cooling box after main heat exchanger 6 is compound after expansion, partially as again
Anger introduces the molecular sieve adsorber 4 being used alternatingly after being heated by electric heater 5, remaining emptying.
Claims (2)
1. liquefy purity nitrogen device for making in a kind of novel outer pressurization, which is characterized in that including filter, Turbine Air compressor,
Air precooling unit, the molecular sieve adsorber being used alternatingly, electric heater, main heat exchanger, booster expansion machine, rectifying column I, rectifying
Tower II, condenser/evaporator I, condenser/evaporator II, subcooler, liquefier, supercharger,
Filter, Turbine Air compressor, air precooling unit, the molecular sieve adsorber being used alternatingly, electric heater, supercharger
Outside ice chest, main heat exchanger, booster expansion machine, rectifying column I, rectifying column II, condenser/evaporator I, condenser/evaporator II, supercooling
Device, liquefier are set in ice chest, and condenser/evaporator I is set to above rectifying column I, and condenser/evaporator II is set to above rectifying column II；
Filter, Turbine Air compressor, air precooling unit, the molecular sieve adsorber being used alternatingly are sequentially connected, and alternating makes
Molecular sieve adsorber is connected with main heat exchanger, and main heat exchanger is connected with the raw air import of the bottom rectifying column I；
Pressure nitrogen gas outlet at the top of rectifying column I is connected with main heat exchanger, condenser/evaporator I respectively, and main heat exchanger connection is external
Pipeline is to provide pressure nitrogen gas product；The liquid nitrogen outlet of condenser/evaporator I is stored with liquid nitrogen outside the top rectifying column I, ice chest respectively
Tank connection, wherein liquid nitrogen outlet and the connecting line at the top of rectifying column I of condenser/evaporator I is equipped with angie type low temperature valve；
The liquid air outlet of the bottom rectifying column I is connected with subcooler, and subcooler is connected with condenser/evaporator I, rectifying column II respectively, mistake
The connecting line of cooler and condenser/evaporator I are equipped with throttle valve, and the connecting line of subcooler and rectifying column II are equipped with throttling
Valve；The dirty nitrogen outlet of condenser/evaporator I is connected with liquefier, and liquefier is connected with supercharger, and supercharger connects with liquefier again
It connects, liquefier is connected with the bottom rectifying column II, and liquefier and rectifying column II bottom connecting line are equipped with throttle valve；
Pressure nitrogen gas outlet at the top of rectifying column II is connected with main heat exchanger, condenser/evaporator II respectively, and main heat exchanger connection is outer
Portion's pipeline is connected at the top of the liquid nitrogen outlet of condenser/evaporator II and rectifying column II with providing pressure nitrogen gas product；
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
Condenser/evaporator II connecting line is equipped with throttle valve, and the dirty nitrogen outlet of condenser/evaporator II is connected with subcooler, subcooler
It being connected with main heat exchanger, the re-heat outlet of main heat exchanger part is connected with booster expansion machine, and booster expansion machine is connected with main heat exchanger,
Main heat exchanger is connected with electric heater, external exhausting pipeline respectively, and electric heater is connected with the molecular sieve adsorber being used alternatingly.
2. liquefy purity nitrogen preparation method in a kind of novel outer pressurization, 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: raw air part after purification is used for instrument air, remaining enters main heat exchanger and is cooled to saturation and band
Have and centainly participates in rectifying containing the wet rear bottom rectifying column I that enters；
Step 3: air is separated into pressure nitrogen gas and liquid air after rectifying column I rectifying；Pressure nitrogen gas is divided into two strands, one is directly
It draws the cooling box after main heat exchanger re-heat to exchange heat as product for user, another gang of introducing condenser/evaporator I and liquid air, pressure
Power nitrogen is condensed into liquid nitrogen, and for extension liquid nitrogen as product for user, remaining introduces rectifying column I as phegma；Liquid air
It is divided into two strands after subcooler is subcooled, rectifying column II is introduced after one throttling and participates in rectifying, enters condensation after another meropodium stream and steams
It sends out device I to exchange heat as cold source and pressure nitrogen gas, liquid air is vaporizated into dirty nitrogen, dirty nitrogen cooling box after liquefier re-heat, through increasing
Liquefier is returned to after press pressurization, dirty nitrogen and dirty nitrogen carry out heat exchange after pressurization, and dirty nitrogen is by partial liquefaction, section after pressurization
Rectifying column II is introduced after stream participates in rectifying；
Step 4: the liquid air that the dirty nitrogen and rectifying column I of partial liquefaction introduce is separated into oxygen-enriched liquid air after rectifying column II rectifying
And pressure nitrogen gas, pressure nitrogen gas are divided into two strands, one directly lead out after main heat exchanger re-heat cooling box as product for
Family, another gang of introducing condenser/evaporator II and oxygen-enriched liquid air heat exchange, pressure nitrogen gas are condensed into liquid nitrogen, and liquid nitrogen introduces rectifying column II
As phegma；Oxygen-enriched liquid air introduces condenser/evaporator II after throttling and exchanges heat as cold source and pressure nitrogen gas, oxygen-enriched liquid air quilt
Pressure nitrogen gas is vaporizated into dirty nitrogen, and dirty nitrogen introduces booster expansion machine expansion after subcooler re-heat, the re-heat of main heat exchanger part
Ice chest institute chilling requirement is produced, dirty nitrogen cooling box after main heat exchanger is compound after expansion, partially as regeneration gas by electric heater
The molecular sieve adsorber being used alternatingly is introduced after heating, remaining emptying.
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| CN110207457A (en) * | 2019-06-08 | 2019-09-06 | 苏州制氧机股份有限公司 | It is a kind of can liquid nitrogen processed air separation plant and its application method |
| CN111141110A (en) * | 2020-01-19 | 2020-05-12 | 杭州特盈能源技术发展有限公司 | Low-energy-consumption medium-pressure nitrogen preparation process |
| CN111412724A (en) * | 2020-04-29 | 2020-07-14 | 杭州特盈能源技术发展有限公司 | Novel low-energy-consumption pressure oxygen enrichment preparation process for kiln |
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| WO2021016756A1 (en) * | 2019-07-26 | 2021-02-04 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process and apparatus for the separation of air by cryogenic distillation |
| CN113606866A (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 nitrogen by air separation |
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| CN113606866A (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 nitrogen by air separation |
| CN114440553A (en) * | 2022-02-18 | 2022-05-06 | 杭州制氧机集团股份有限公司 | Low-energy-consumption double-tower pure nitrogen preparation device adopting nitrogen expansion refrigeration and application method |
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