CN107940801B - A kind of space division system recycling compressed air waste-heat - Google Patents
A kind of space division system recycling compressed air waste-heat Download PDFInfo
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- CN107940801B CN107940801B CN201710995255.XA CN201710995255A CN107940801B CN 107940801 B CN107940801 B CN 107940801B CN 201710995255 A CN201710995255 A CN 201710995255A CN 107940801 B CN107940801 B CN 107940801B
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- compressed air
- cooling
- generator
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- 239000002918 waste heat Substances 0.000 title claims abstract description 23
- 238000004064 recycling Methods 0.000 title claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 68
- 238000010521 absorption reaction Methods 0.000 claims abstract description 30
- 238000007906 compression Methods 0.000 claims abstract description 24
- 239000006200 vaporizer Substances 0.000 claims abstract description 22
- 230000006835 compression Effects 0.000 claims abstract description 20
- 239000006096 absorbing agent Substances 0.000 claims abstract description 13
- 230000001172 regenerating effect Effects 0.000 claims abstract description 13
- 238000000746 purification Methods 0.000 claims abstract description 12
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 116
- 229940059936 lithium bromide Drugs 0.000 claims description 58
- 238000005057 refrigeration Methods 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 14
- 239000002808 molecular sieve Substances 0.000 claims description 6
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 3
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052794 bromium Inorganic materials 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 2
- 239000011552 falling film Substances 0.000 claims 1
- 239000010408 film Substances 0.000 claims 1
- 238000005192 partition Methods 0.000 claims 1
- 238000010025 steaming Methods 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 238000007791 dehumidification Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 238000004821 distillation Methods 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000031709 bromination Effects 0.000 description 2
- 238000005893 bromination reaction Methods 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- F25J3/04151—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
-
- 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
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/02—Compressor intake arrangement, e.g. filtering or 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
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/04—Compressor cooling arrangement, e.g. inter- or after-stage cooling or condensate removal
-
- 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
- F25J2270/906—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration by heat driven absorption chillers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Drying Of Gases (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
Abstract
The invention discloses a kind of space division systems for recycling compressed air waste-heat, including air flow circuit and purification blocks, further include dehumidifying regenerative circuit and Absorption Cooling System circuit；The dehumidifying regenerative circuit includes dehumidifier, the first solution heat exchanger, generator, first flow controller and the first solution pump；The Absorption Cooling System circuit includes high temperature air channel, condenser, expansion element, cryogenic vaporizer, the cooling duct of the dehumidifier, absorber, the second solution pump, the second solution heat exchanger, second flow controller and the restricting element of the generator；The air flow circuit includes the secondary passage for removing wet channel, level-one air compressor machine, the one stage of compression air precooling flow path of generator, the first cooling unit, the level-one channel of cryogenic vaporizer, second level air compressor machine, the two-stage compressed air pre-cooling flow path of generator, the second cooling unit and cryogenic vaporizer for being sequentially communicated dehumidifier, is finally passed through purification blocks.
Description
Technical field
The present invention relates to industrial air pretreatment system more particularly to a kind of space division systems for recycling compressed air waste-heat.
Background technique
Air separation technology is developed so far existing more than 100 years history, i.e., separates each component gas in air, raw
Produce the industrial technology of the gases such as oxygen, nitrogen and argon gas.It is widely used in the processes such as industrial production, medical treatment.Air separation equipment
It successively mainly include air compressor machine, air cooling system, purification system, heat-exchange system, expanding machine, distillation system and part satellite system
System.
Currently, process organization form of the air in air compressor machine, air cooling system and purification system is general are as follows: firstly, external
The air obtained in environment is rough to filter larger particles pollutant by filter；Secondly, being carried out by multiple air compressor machines multistage
Compression, obtains the air of elevated pressures；Then, air enter air cooling tower cooled down, washing process, it is lower full to obtain temperature
And air；Purification system is finally entered, using the suction-operated of aluminium oxide and molecular sieve, removes moisture and other gas in air
Body impurity finally obtains high pressure, pure air is sent into distillation system and carries out distillation process.
In general space division process, air is before entering air compressor machine, and relative air humidity is identical as surrounding air, generally
60%-90%, air compressor machine belong to idle work to the work done during compression of water vapor in air；In addition, can be produced with air compressor machine compression process
Life is largely compared with the thermal energy of GOOD TASTE, and air can be heated to 130 DEG C, and all take away heat using water circulating cooling at present, air
Be cooled to 40 DEG C or so, this is a kind of waste of energy, and enter next stage air compressor machine before, air themperature still compared with
Height causes compressor series to increase, increased costs.
For example, notification number is a kind of air separating method disclosed in the Chinese invention patent document of CN104903669A and sky
Air separation while being able to suppress the decline of the yield of argon, extracts more medium pressure nitrogen gas, pressure is higher than medium pressure nitrogen gas
High pressure nitrogen, liquid oxygen or liquid nitrogen etc., the medium pressure nitrogen gas using the top of the argon gas and medium pressure column at the top of argon column makes lower pressure column
The low-pressure liquid oxygen of bottom boil again, and make the middle hydraulic fluid oxygen of the bottom of argon column again using the high pressure nitrogen at the top of high-pressure tower
Boiling.
It is opposite not account for air before compressing in the preprocessing process before air enters heat-exchange system for above-mentioned apparatus
Humidity is larger and compression process leads to the problem of waste heat and is not utilized.
Summary of the invention
The present invention provides a kind of space division systems for recycling compressed air waste-heat, effectively reduce number of compression stages, and can be with
Air cooling unit is removed, the energy is made full use of, achievees the purpose that save the cost.
A kind of space division system recycling compressed air waste-heat, including air flow circuit and purification blocks further include dehumidifying regeneration
Circuit and Absorption Cooling System circuit；
The dehumidifying regenerative circuit includes dehumidifier, the first solution heat exchanger, generator, first flow controller and
One solution pump；
The Absorption Cooling System circuit includes the high temperature air channel of the generator, condenser, expansion element, low
Warm evaporator, the cooling duct of the dehumidifier, absorber, the second solution pump, the second solution heat exchanger, second flow control
Device and restricting element；
The air flow circuit includes the one stage of compression for removing wet channel, level-one air compressor machine, generator for being sequentially communicated dehumidifier
Air precooling flow path, the first cooling unit, the level-one channel of cryogenic vaporizer, second level air compressor machine, the two-stage compression of generator are empty
The secondary passage of flow path, the second cooling unit and cryogenic vaporizer is pre-chilled in gas, is finally passed through purification blocks.
Controller and element generally use valve device.
In order to improve purification effect, it is preferred that the purification blocks use molecular sieve.
The present invention not only can carry out pre-dehumidified to air, reduce the function of air compressor machine pressurized water steam consumption, due to sky
Air water point is reduced, and avoids air compressor machine band hydraulic compression damage caused by air compressor machine；It can also be generated using air compression process
Waste heat junior compress before precooled air, reduce air compressor machine processing air temperature, it is possible to reduce air compressor machine series, together
When, go out since cryogenic vaporizer outlet air temperature, water capacity have reached space division process hollow cold unit in the prior art
Mouth compressed air temperature, water capacity requirement, present system can remove existing air separation plant hollow cold unit, to substantially reduce
System cost.
In air flow circuit, the air in environment passes through dehumidifier first, by dehumidifying agent solution to air carry out dehumidifying with
Washing, and utilize the absorption of the refrigeration working medium absorption dehumidifying agent solution in Absorption Cooling System heat, indirect precooled air；So
Afterwards, air enters level-one air compressor machine and is compressed, and obtains the higher air of temperature, pressure；Enter generator later, respectively removes
Wet regenerative circuit, Absorption Cooling System provide heat, and air themperature reduces；Generator exports air is handed over by cooling unit again
Heat exchange amount；Air enters cryogenic vaporizer later, is cooled to 15 DEG C or so using the cooling capacity that Absorption Cooling System circuit provides,
Second compression again is carried out subsequently into second level air compressor machine, air is again introduced into Absorption Cooling System circuit after compression, later air
It exchanges heat into cooling unit, finally enters molecular sieve and purified.
In order to simplify structure, energy-saving effect is improved, it is preferred that first cooling unit and the second cooling unit are same
Two cooling ducts of water cooler.
Preferably, the dehumidizer of the dehumidifying regenerative circuit and the working medium in Absorption Cooling System circuit all use bromination
Lithium.Lithium bromide property is stablized, and is unlikely to deteriorate, is not easily decomposed, is not easy to evaporate in an atmosphere, nontoxic odorless under room temperature；Vapor point
Pressure is very low, and the saturation vapour pressure than synthermal lower pure water is much lower, thus has strong hygroscopicity；It is highly soluble in water；Bromine
It is smaller than solution such as sodium chloride, calcium chloride to the corrosion of metal material to change lithium solution.The dehumidizer and Absorption Cooling System
Calcium chloride, sodium chloride etc. also may be selected in working medium.
In order to improve dehumidification efficiency and heat transfer effect, it is preferred that in the dehumidifier, lithium-bromide solution is dropped using plate
The mode that film absorbs dehumidifies to air, and wall-type heat exchange mode is used between the refrigeration working medium and lithium-bromide solution.
Preferably, the dehumidifier includes:
Shell；
Several heat-conducting plates, the heat-conducting plate erected parallel setting inside the shell, form the cooling duct being sequentially arranged at intervals
And vent passages, refrigeration working medium from top to bottom flow in the cooling duct, lithium-bromide solution is thermally conductive in vent passages
Flowing from top to bottom forms liquid film, the flowing of air flow circuit cross ventilation channel on plate.The lithium-bromide solution liquid being distributed on heat-conducting plate
Film carries out moisture absorption and washing to air, removes moisture and solids pollutant in air.
Lithium bromide concentrated solution is diluted into weak solution after absorbing moisture in dehumidifier, flows into generator from dehumidifier bottom
In, weak solution moisture in generator evaporates, and concentration becomes larger, and the concentrated solution of generator exports is adjusted by first flow adjuster
Flow, and using the first solution pump into dehumidifier, to air pre-dehumidified and washing, complete circulation.
For the ease of manufacture and use, it is preferred that the absorber is cooled down using water-cooling pattern.
In order to improve heat transfer effect, it is preferred that the cryogenic vaporizer uses wall-type heat exchange.
In order to improve heat exchange efficiency, it is preferred that heat exchanger uses wall-type heat exchange in the generator.The hair
Raw device bottom solution pond is provided with heat exchanger, is exchanged heat using high temperature air after wall-type heat exchange, with compression.In generator
Lithium-bromide solution absorbs compressor outlet high temperature air heat, evaporates moisture in solution, regenerates to lithium-bromide solution；It is molten
Moisture evaporation in liquid, completes following cycle into condenser.
It further include solution heat exchanger in the dehumidifying regenerative circuit, the cold end of solution heat exchanger is connected to dehumidifier
Lithium-bromide solution outlet the lithium-bromide solution entrance of generator between, the hot end of solution heat exchanger is connected to generator
Between lithium-bromide solution outlet and the lithium-bromide solution entrance of dehumidifier.
The lithium bromide that the lithium bromide weak solution flowed out from dehumidifier passes through the first solution heat exchanger and generator outflow
Concentrated solution carries out heat exchange, reaches solution heat exchanger outlet weak solution temperature and increases, solution heat exchanger exports concentrated solution
The effect that temperature reduces.
In Absorption Cooling System circuit, the refrigeration working medium steam of generator exports exchanges heat with cooling water within the condenser,
Become low temperature and low pressure liquid by expansion valve after cooling, absorbs compressed air heat in cryogenic vaporizer, cryogenic vaporizer outlet
Refrigeration working medium enters in dehumidifier raw air and lithium bromide dehumidification liquid heat in absorption dehumidifying device, and absorber is entered after heating,
Absorber low exit temperature lithium bromide weak solution is boosted through the second solution pump, and in the second solution heat exchanger with generator exports
High temperature lithium bromide concentrated solution heat exchange enters generator later, and lithium bromide concentrated solution enters second from generator exports after concentration
Molten hydrothermal solution exchanger, is depressured after cooling through restricting element, into absorber, thus completes refrigeration cycle.
The present invention combines current existing dehumidifying technology and sorption type refrigerating technology, and the waste heat that air is partially compressed is subject to
It utilizes, air themperature and humidity can be significantly reduced, on the one hand reduce compressor and do work to vapor, on the other hand due to air
Temperature reduces when into compressor, pressure ratio can be improved, there are possibility to reduce to second level pressure for the three stage compression in current space division system
Contracting.Meanwhile after lithium bromide circuit is dehumidified and lithium bromide absorption refrigeration circulation loop cools down, compressed air state meets existing
State needed for exporting after air cooling unit is handled in space division system, then can remove air cooling unit, thus greatly save cost.
Beneficial effects of the present invention:
(1) waste heat generated in compression process present invention utilizes air compressor machine in air separation process is heat source, into
The air for entering next stage air compressor machine is cooled down, and is no longer simply cooled down using cooling water, energy saving.
(2) present invention utilizes the water absorption character of lithium-bromide solution, absorbs the moisture in air, and dehumidify simultaneously rinse air, subtracts
The function of air compressor machine pressurized water steam consumption is lacked；In addition, avoiding air compressor machine band hydraulic compression to pneumatics since air moisture is reduced
It is damaged caused by machine.
(3) present invention is by Absorption Cooling System, using residual heat of air compressor as heat source, to the sky for entering next stage air compressor machine
Gas is pre-chilled, and the temperature of air compressor machine processing air is reduced, it is possible to reduce air compressor machine series, while Absorption Cooling System does not have
There is moving component, the service life is long, and it is easy to operate, thus greatly reduce system cost.
(4) compressed air temperature in the present invention after recovery waste heat reaches existing space division process hollow cold machine set outlet gas
It is required that can remove air cooling unit, system cost is greatly saved.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the space division system of the prior art.
Fig. 2 is the structural schematic diagram of the space division system of recycling compressed air waste-heat of the invention.
Fig. 3 is the structural schematic diagram of dehumidifier Zhong Ge fluid tissue in embodiment.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawings and examples.
As shown in Figure 1, the raw air in the space division system of the prior art after filter coarse filter bulky grain is first
Into level-one air compressor machine 2, enter the first water cooler 17 after increasing temperature and pressure, is cooled to 40 DEG C or so and enters the continuation of second level air compressor machine 7
Compression, second level air compressor machine outlet compressed air enters the second water cooler 18 and is cooled to 40 DEG C or so, into three-level sky road roller 19,
Three-level air compressor machine 19 exports high temperature and high pressure gas and enters 20 cool-down dehumidification of air cooling tower, becomes the saturated air that temperature is 15 DEG C or so
Body enters molecular sieve later and completes subsequent step.
Wherein, cooling water a part is supplied water by the external world and is pumped to tower middle part through third solution pump 22 in air cooling tower 20, another
Part is pumped to top through the 4th solution pump 21 by water-cooling tower 23.Air cooling tower and water-cooling tower are known as air cooling unit.
As shown in Fig. 2, the space division system in the recycling heat of compressor of the present embodiment includes air flow circuit, lithium bromide dehumidifying
Regenerative circuit and Lithium Bromide Absorption Refrigeration Cycle circuit, in which:
Air flow circuit, including be sequentially communicated dehumidifier 1, level-one air compressor machine 2, generator 3 one stage of compression air precooling
It is flow path, water cooler 4, cryogenic vaporizer 8, second level air compressor machine 7, generator 3 in two-stage compressed air pre-cooling flow path, water cooler 4, low
Warm evaporator 8, molecular sieve and subsequent technique.
The course of work is as follows: raw air enters dehumidifier 1, enters level-one air compressor machine 2 after cool-down dehumidification, becomes high temperature height
It calms the anger body, enters generator 3 later, heat is absorbed by lithium-bromide solution in generator 3, dehumidify regenerative circuit and bromine for lithium bromide
Change lithium-absorbing formula refrigeration cycle and heat is provided back.Generator exports compressed air enters water cooler 4, and cooled water takes away heat
Amount.Enter cryogenic vaporizer 8 later, exchange heat with refrigeration working medium, second level air compressor machine 7 is entered after cooling.Second level air compressor machine 7 exports height
Warm high pressure gas is again introduced into generator 3, and water cooled device 4 and cryogenic vaporizer 8 cool down later.Air themperature substantially 15 at this time
DEG C, meet existing air cooling unit outlet air requirement, therefore air cooling unit can be removed in the space division system.
As shown in figure 3, in conjunction with Fig. 2 as it can be seen that there is three kinds of air, refrigeration working medium and lithium-bromide solution flow paths in dehumidifier 1
Organizational form.Wherein, 1 space of dehumidifier is divided into 2 class regions by high thermal conductivity plate 1001: the narrow side and wide side being successively spaced apart.
Refrigeration working medium flow path 1002 flows downward in narrow side spatial vertical；Lithium-bromide solution flow path 1003 is in wide side space high thermal conductivity plate
1001 wall surfaces form liquid film, carry out heat with refrigeration working medium flow path 1002 by high thermal conductivity plate 1001 and exchange, and flow vertically downward
It is dynamic, lithium bromide weak solution is enriched in 1 bottom of dehumidifier；Air flow circuit 1004 wide side spatial vertical in paper flow, during which with
Lithium-bromide solution liquid film carries out heat and mass.High thermal conductivity plate 1001 provides condition for the formation of lithium-bromide solution liquid film, and
Refrigeration working medium flow path 1002 and lithium-bromide solution flow path 1003, air flow circuit 1004 are separated, reaches and utilizes refrigeration working medium
Absorb the absorption heat of lithium-bromide solution, the purpose of indirect cooling air.
Lithium bromide dehumidifies in regenerative circuit, and the outflow of 1 bottom of low temperature lithium bromide weak solution dehumidifier is handed over into the first solution heat
Parallel operation 16 exchanges heat with high temperature lithium bromide concentrated solution, and generator 3 is entered after cooling, absorbs high temperature bromination after compressed air heat
Lithium concentrated solution is exported from generator 3 to flow out, and adjusts flow by first flow valve 14, and boost laggard first by the first solution pump 15
Solution heat exchanger 16 enters dehumidifier 1 and absorbs moisture in raw air, and takes away heat by refrigeration working medium after cooling, become
Low temperature lithium bromide weak solution is flowed out from 1 bottom of dehumidifier, thus completes lithium bromide dehumidifying regenerative circuit.
In Lithium Bromide Absorption Refrigeration Cycle circuit, high-temperature refrigeration working substance steam enters condenser 5 at the top of generator 3,
Cooled water takes away heat, and expansion valve 6 is entered after cooling, becomes low temperature and low pressure liquid and enters cryogenic vaporizer 8, evaporation endothermic,
The outlet of cryogenic vaporizer 8 refrigeration working medium, which enters dehumidifier 1, to be continued to absorb heat, and is entered absorber 9 later, is absorbed weak solution in device 9
It absorbs, while lithium-bromide solution and cooling water exchange heat in absorber 9.9 low exit temperature lithium bromide weak solution of absorber is by later
The boosting of two solution pumps 10 enters generator 3 after absorbing high temperature lithium bromide concentrated solution heat into the second solution heat exchanger 12.
Lithium-bromide solution absorbs heat in compressed air in generator 3.Generator 3 exports high temperature lithium bromide concentrated solution by second flow valve
13 adjusting flows are depressured after cooling by throttle valve 11 into the second solution heat exchanger 12, and it is dense molten to become low-temp low-pressure lithium bromide
Liquid enters absorber 9, thus completes Lithium Bromide Absorption Refrigeration Cycle circuit.
Wherein, cooling water goes successively to condenser 5 and absorbs refrigeration working medium after absorber 9 and lithium-bromide solution heat exchange
Heat.8 low exit temperature refrigerant of cryogenic vaporizer enters dehumidifier 1 and takes away raw air and lithium bromide dehumidification liquid heat.
Specific calculating is as follows:
According to the actual situation and there is experience, with 60000Nm3For/h space division system.T1=25 DEG C of raw air temperature,
Water capacity d1=16g/kg, pressure P1=1bar, T2=15 DEG C of dehumidifier outlet air temperature, water capacity d2=5g/kg (level-one
Air compressor machine inlet air condition).Level-one air compressor machine outlet air temperature is T3=115 DEG C.Water cooler outlet air temperature is T4
=40 DEG C.Lithium-bromide solution effect on moisture extraction is that ε=0.44g/kJ (refers to input 1kJ heat in lithium bromide dehumidification system, can remove
0.44g vapor), Lithium Bromide Absorption Refrigeration Cycle efficiency is η 1=0.7.According to existing air cooling unit outlet air condition,
Taking cryogenic vaporizer outlet air temperature is T5=15 DEG C (i.e. split-compressor inlet air condition).Second level air compressor machine outlet pressure
T6=115 DEG C of contracting air.Air is T7=15 DEG C behind lithium bromide absorbing type refrigeration circuit after two-stage compression.Air compressor machine isentropic efficiency
It is that η 2=0.85 assumes that air mass flow remains unchanged, and water capacity is small in air after dehumidifier, and when calculating ignores the part
Vapor.
Judge whether second level air compressor machine outlet pressure meets the requirements
∴P2=2.47bar；
Similarly, P3=6.11bar；
Wherein, P2 is level-one air compressor machine outlet pressure, and P3 is second level air compressor machine outlet pressure.It is general in existing space division system
Raw air is compressed to 6bar by three stage compression, two-stage compression can reach requirement herein, therefore can reduce number of compression stages and be
Two-stage compression greatlys save cost.
1, judge whether air compressor machine outlet compressed air waste-heat meets energy requirement:
Air mass flow: 60000N m3/ h=106kg/s；
Moisture removal in dehumidifier:
mH2O=m (d1-d2)=106kg/s* (16-5) g/kg=1166g/s；
Institute's calorific requirement in dehumidifier:
Q1=mH2O/ ε=1166g/s ÷ 0.44g/kJ=2650kW；
Compressed air heat release in cryogenic vaporizer:
Q2=mcp((T4-T5)+(T4-T7))
=106kg/s*1.004kJ/kg DEG C of * (40-15) DEG C * 2=5321kW
Lithium Bromide Absorption Refrigeration Cycle institute chilling requirement: Q3=Q2=5321kW；
Lithium Bromide Absorption Refrigeration Cycle institute calorific requirement: Q4=Q3/ η=7602kW；
Heat: Q is provided needed for compressed air in generator5=Q1+Q4=10251kW；
Q5=mcp((T3-T8)+(T6-T8))
=106kg/s*1.004kJ/kg DEG C of * (115-T8) * 2=10251kW
∴T8=66.8 DEG C；
T8For generator exports compressed air temperature.So when air compressor machine outlet compressed air temperature is 110 DEG C, as long as
Generator exports compressed air temperature be less than or equal to 66.8 DEG C, that is, be able to satisfy cryogenic vaporizer outlet compressed air temperature be less than or
Equal to 15 DEG C, so designed system can remove the air cooling unit of existing air separation plant while waste heat is compressed in recycling, and
Lithium bromide dehumidification system and the lithium bromide refrigerating circulatory system movement-less part in addition to solution pump, system run all right is easy to operate,
Long service life greatlys save cost.
Technical solution of the present invention and beneficial effect is described in detail in embodiment described above, it should be understood that
Above is only a specific embodiment of the present invention, it is not intended to restrict the invention, it is all to be done in spirit of the invention
Any modification, supplementary, and equivalent replacement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of space division system for recycling compressed air waste-heat, including air flow circuit and purification blocks, which is characterized in that further include
Dehumidifying regenerative circuit and Absorption Cooling System circuit；
The dehumidifying regenerative circuit includes that dehumidifier, the first solution heat exchanger, generator, first flow controller and first are molten
Liquid pump；
The Absorption Cooling System circuit includes the high temperature air channel of the generator, condenser, expansion element, low temperature steaming
Send out device, the cooling duct of the dehumidifier, absorber, the second solution pump, the second solution heat exchanger, second flow controller and
Restricting element；
The air flow circuit includes the one stage of compression air for removing wet channel, level-one air compressor machine, generator for being sequentially communicated dehumidifier
Pre-cooling flow path, the first cooling unit, the level-one channel of cryogenic vaporizer, second level air compressor machine, the two-stage compressed air of generator are pre-
Cold flow road, the second cooling unit and cryogenic vaporizer secondary passage, be finally passed through purification blocks.
2. the space division system of recycling compressed air waste-heat as described in claim 1, which is characterized in that the purification blocks use
Molecular sieve.
3. the space division system of recycling compressed air waste-heat as described in claim 1, which is characterized in that first cooling unit
It is two cooling ducts of same water cooler with the second cooling unit.
4. the space division system of recycling compressed air waste-heat as described in claim 1, which is characterized in that the dehumidifying regenerative circuit
Lithium bromide is all used with the working medium in Absorption Cooling System circuit.
5. the space division system of recycling compressed air waste-heat as claimed in claim 4, which is characterized in that in the dehumidifier, bromine
Change lithium solution to dehumidify to air by the way of plate falling film absorption, partition is used between refrigeration working medium and lithium-bromide solution
Formula heat exchange mode.
6. the space division system of recycling compressed air waste-heat as claimed in claim 5, which is characterized in that the dehumidifier packet
It includes:
Shell；
Several heat-conducting plates, the heat-conducting plate erected parallel setting inside the shell, form the cooling duct being sequentially arranged at intervals and lead to
Wind channel, refrigeration working medium from top to bottom flow in the cooling duct, and lithium-bromide solution is on the heat-conducting plate in vent passages
Flowing from top to bottom forms liquid film, the flowing of air flow circuit cross ventilation channel.
7. the space division system of recycling compressed air waste-heat as described in claim 1, which is characterized in that the absorber uses water
Cold mode is cooled down.
8. the space division system of recycling compressed air waste-heat as described in claim 1, which is characterized in that the cryogenic vaporizer
Using wall-type heat exchange.
9. the space division system of recycling compressed air waste-heat as described in claim 1, which is characterized in that hot in the generator
Exchanger uses wall-type heat exchange.
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| CN109520208B (en) * | 2018-10-11 | 2020-12-18 | 浙江大学 | Polyolefin device exhaust gas recovery system coupling waste heat refrigeration technology and expansion cryogenic separation technology |
| CN109539693B (en) * | 2018-11-24 | 2021-05-07 | 王征 | Gas cooling system and gas cooling method |
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| CN111238167B (en) * | 2020-03-17 | 2024-04-16 | 北京科技大学 | Energy-saving heating device and method for air separation device |
| CN111649501A (en) * | 2020-05-29 | 2020-09-11 | 扬州秦风气体有限公司 | Energy-saving system and method based on air separation system |
| CN113251469B (en) * | 2021-05-12 | 2023-10-27 | 四川零碳工程科技有限公司 | Multistage waste heat recovery heat supply oxygenerator group |
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