CN109157944A - A kind of VOCs classification cryogenic recovery system of throttling expansion refrigeration - Google Patents
A kind of VOCs classification cryogenic recovery system of throttling expansion refrigeration Download PDFInfo
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- CN109157944A CN109157944A CN201811221895.6A CN201811221895A CN109157944A CN 109157944 A CN109157944 A CN 109157944A CN 201811221895 A CN201811221895 A CN 201811221895A CN 109157944 A CN109157944 A CN 109157944A
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- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 102
- 238000005057 refrigeration Methods 0.000 title claims abstract description 62
- 238000011084 recovery Methods 0.000 title claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 89
- 238000010257 thawing Methods 0.000 claims abstract description 26
- 238000009833 condensation Methods 0.000 claims abstract description 15
- 230000005494 condensation Effects 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims description 58
- 238000003860 storage Methods 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000010926 purge Methods 0.000 claims description 6
- 239000010410 layer Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 230000002595 cold damage Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 235000019628 coolness Nutrition 0.000 claims description 2
- 239000011229 interlayer Substances 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims 3
- 230000008676 import Effects 0.000 claims 1
- 238000009423 ventilation Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 53
- 230000008569 process Effects 0.000 abstract description 20
- 238000012545 processing Methods 0.000 abstract description 9
- 230000006978 adaptation Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 54
- 238000000926 separation method Methods 0.000 description 10
- 238000010521 absorption reaction Methods 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 239000003507 refrigerant Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000004064 recycling Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000009841 combustion method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000010815 organic waste Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000010808 liquid waste Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 210000004761 scalp Anatomy 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0033—Other features
- B01D5/0054—General arrangements, e.g. flow sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention discloses a kind of VOCs of throttling expansion refrigeration to be classified cryogenic recovery system, including the pre-cooling of refrigeration system, level-one chilldown system, second level removes four defrosting system, VOCs main heat exchange system parts.Comprehensive utilization process cooling capacity makes the circularly cooling working medium pressed in room temperature liquefy, and throttling expansion reach after deep cooling low temperature with gas converting heat containing VOCs, make wherein VOCs component condense and be discharged.The exhaust gas of the low VOCs content of the low temperature obtained after heat exchange backflows again passes to level-one chilldown system, second level pre-cooling except defrosting system, carries out classification pre-cooling to input gas using cooling capacity.Gas containing VOCs after processing meets the discharge standard of national regulation, can be directly discharged into atmosphere.This method, can be cooling by the classification to different component in VOCs compared with traditional condensation method, greatly improves energy utilization efficiency, efficient stable low cost.The use of method is not limited by the component of source gas, concentration simultaneously, and adaptation range is wider, and operation stability is higher.
Description
Technical field
The invention belongs to volatile organic gases purification separation fields, and in particular to a kind of efficient, stable, low cost more
The VOCs of grade separation and recycling volatile organic gases is classified cryogenic recovery system.
Background technique
VOCs refers to volatile organic gases (Volatile Organic Compounds), is in life production process
It extremely common are harmful exhaust gas source, very important influence can be generated to human health and ecological environment.In industrial tail
The problems such as gas mostly contains VOCs component in discharging, and generally existing concentration is low, complicated composition, how energy-efficiently to VOCs
Carry out the important research direction that processing is national energy conservation and emission reduction cause.
Currently, the VOCs processing technique that China uses mainly includes condensation method, absorption method, absorption process, combustion method, UF membrane
Method and biological treatment etc..Although relatively broad application has been obtained in portion of techniques such as absorption method, condensation method, absorption process etc.
And development, but still it is more or less have some limitations, such as absorption method and absorption process, although have high treating effect,
The advantages such as easy to operate, but mostly there is the reuse limit in trapping medium used, need to regularly replace；Although condensation method not by
The limitation of VOCs constituent species, if but reducing to improve the rate of recovery condensation temperature merely or increasing absorption number and be bound to cause
Cost recovery greatly increases；Combustion method has higher requirements to gas component combustibility, burning situation, vent gas treatment etc.；Film
Partition method and biologic treating technique not yet full maturity, and limited by conditions such as VOCs components, it is difficult to a wide range of promotion and implementation.
Therefore, the ecological, environmental protective in face of the commercial production scale, increasingly increased VOCs process demand and the continuous improvement that are gradually expanded is wanted
It asks, on the basis of traditional recovery and treatment method, it is necessary to improve and optimize, to promote the recovery processing efficiency of VOCs.Closely
A kind of activated carbon adsorption desorption VOC organic waste gas treatment system of patent CN201812399160.6 disclosed in phase,
A kind of VOC gas absorber second level heat of CN201812324258.5 returns to level-one energy conserving system and method, removes to absorption method
VOCs technology is improved, and proposes optimization from the angle of dedusting separation and UTILIZATION OF VESIDUAL HEAT IN, but still needs to carry out adsorbing medium
Control；A kind of VOC organic waste gas treatment equipment of CN201812399234.6, combines plasma technology and spray-absorption technology,
Removal effect is greatly improved, but the later period still needs to carry out liquid waste processing and VOCs recycling；CN201812337298.3 one kind is used for
Catalysis burning adsorption method and device, using combustion method removal efficiency with higher, but require VOCs component to have higher concentration；
The ventilative clarifier of CN201812273279.9VOC biology and purification method, without secondary pollution, treatment effeciency is high, but is only capable of to portion
VOCs component is divided to be removed.The above new publication is made that optimization and wound on the basic principle of conventional processes
Newly, VOCs treatment effeciency is improved to a certain extent.Although these method principles are simple, technology compare over had it is larger into
Step, but the problems such as there are still restricted applications, processing technique still have significant optimization space.
The present invention is the exhaust-gas treatment needs for meeting industrial large-scale continuous production process, is reducing the same of cost recovery
Shi Tigao recovery efficiency collects principle based on VOCs condensation, proposes and reach deep cooling low temperature with throttling expansion technique to be classified depth
Spend the method that cooling VOCs is separated and recovered.The patent of invention that the present invention and applicant have authorized early period
(the VOC recovery system and method for a kind of high efficiency, low cost of CN201512068202.4) is compared and proposes many innovative points: the former
It uses liquid nitrogen direct expansion to complete the technique of deep cooling, needs persistently to input liquid nitrogen by liquid nitrogen container and freeze；Benefit of the invention
It is pre-chilled with the cooling capacity of the gaseous refrigerant working medium obtained after expander and expansion valve throttling expansion, recycles throttling expansion
Process reaches deep cooling low temperature, it is possible to reduce the demand power of the equipment such as compressor expanding machine makes device miniaturization, improves space benefit
Cooling working medium is supplied with rate, and without lasting, reduces the production run cost of system.In addition, the present invention and applicant's early period are
Publication (a kind of VOCs recovery system using air deep-cooling of CN128452632A) also has bigger difference, with the former phase
Than the cooling process design of classification proposed by the present invention can greatly improve energy utilization rate, reduce process cost recovery.This
Invention overcomes some defects and problem existing for existing condensation collection technique, and mentions in principle, process, equipment and operating method
Go out biggish innovation, improves the stability and high efficiency of system operation, and deep cooling cryogenic condensation process can be to most of
The VOCs of type carries out condensation and removal, and the scope of application is wider.
Summary of the invention
The present invention is compared with the prior art in above-mentioned background technique.For it is existing in the prior art not
Foot, object of the present invention is to design the VOCs classification cryogenic recovery system and method for a kind of efficient stable low cost.Its refrigeration principle
It is to compress to obtain high-pressure working medium respectively using two compressors, a part is pre-chilled for direct expansion, and a part is for being pre-chilled
Throttling expansion obtains deep cooling low temperature afterwards: refrigeration working medium is first compressed heating by No. two compressors, and 20 DEG C or so are cooled to after water cooled,
Carry out pre-cooling cooling into No. two precool heat exchanger devices in ice chest, after low-temp low-pressure gaseous refrigerant work obtained by expander
Matter returns in No. two precool heat exchanger devices and provides cooling capacity to heat transfer process；Low pressure room temperature refrigeration working medium after heat exchange is compressed through No. three
It is passed through No. two storage tanks after machine primary compression, is recycled again after controlling flow into No. two compressors.No.1 compressor will freeze work
Matter first compresses heating, is cooled to 12 DEG C or so after water cooled and precool heat exchanger, carries out into No. two precool heat exchanger devices in ice chest
Pre-cooling cooling, the expanded valve throttling expansion of cryogenic high pressure liquid refrigeration working medium after cooling obtain low-temp low-pressure gaseous refrigerant work
Matter, returns in No. two precool heat exchanger devices and provides cooling capacity to heat transfer process, and liquid refrigeration working medium enters main heat exchanger and gas containing VOCs
Body exchanges heat；The cryogenic gaseous refrigeration working medium of main heat exchanger outlet enters No.1 precool heat exchanger device, using remaining cooling capacity to system
Cold working medium is pre-chilled, the room temperature refrigeration working medium and throttling expansion after precool heat exchanger and exchange heat after gaseous refrigerant working medium mixing
Converge in device and be passed through No.1 storage tank, enters No.1 compressor after control flow and start again at refrigeration cycle.Gas containing VOCs is in master
It exchanges heat in heat exchanger with liquid refrigeration working medium, lower temperature can be reached by depth cooling, condense and separate VOCs component therein.
The cryogenic gas obtained after heat exchange and gas-liquid separation backflows again passes to level-one chilldown system and second level pre-cooling except defrosting system, and utilization is cold
Amount carries out classification pre-cooling to the gas containing VOCs newly inputted.Gas containing VOCs after processing meets the discharge mark of national regulation
Standard can be directly discharged into atmosphere.This method, can be by different component in gas containing VOCs compared with traditional condensation method
Classification it is cooling, greatly improve energy utilization efficiency；Utilize the gaseous state system obtained after expander and expansion valve throttling expansion
The cooling capacity of cold working medium is pre-chilled, and throttling expansion process is recycled to reach deep cooling low temperature, reduces the equipment such as compressor expanding machine
Demand power improves space utilization rate, reduces production and operating cost；Simultaneously method use not by the concentration of source gas,
Component limitation, adaptation range is wider, and operation stability is higher.
To achieve the above object, the invention provides the following technical scheme:
A kind of VOCs classification cryogenic recovery system of throttling expansion refrigeration, including refrigeration system, level-one chilldown system, second level
Pre-cooling removes defrosting system, VOCs main heat exchange system, ice chest.Wherein, level-one chilldown system, second level are pre-chilled except defrosting system and VOCs master change
Hot systems are sequentially connected by one VOCs gas passage, after the cooling removing VOCs of air-flow using itself cooling capacity to new input air-flow into
Row pre-cooling.
No.1 compressor that the refrigeration system includes, No.1 cooler, No.1 precool heat exchanger device, No. two precool heat exchangers
Device, expansion valve, No.1 gas-liquid separator, mixer, No.1 storage tank, No. two compressors, No. two coolers, expanding machine, No. three pressures
Contracting machine, No. two storage tanks and the auxiliary equipments such as corresponding pipeline valve and measuring instrument.No.1 compressor and No. two compressors are used for
Make refrigeration working medium increasing temperature and pressure；No.1 cooler and No. two coolers are for being cooled to room temperature high-temperature refrigeration working medium heat release；One
The cryogenic refrigeration working medium cooling capacity that number precool heat exchanger device is exported using main heat exchanger is pre-chilled；No. two precool heat exchanger devices utilize expansion
Two strands high normal pressure and temperature refrigeration working medium is pre-chilled in gaseous refrigerant working medium cooling capacity behind machine outlet and expansion valve throttling expansion；Expansion
Valve is used to that the cryogenic high pressure liquid refrigeration throttling expansion after pre-cooling to be made to reach required deep cooling low temperature；No.1 gas-liquid separator is used
Low-temp low-pressure mixed state refrigeration working medium gas-liquid separation after making throttling expansion, for refrigeration working medium to be pre-chilled, liquid is used for gaseous state
Deep cooling VOCs component；Expanding machine is for making refrigeration working medium expansion cooling provide pre-cooling cooling capacity；No. three compressors are for recycling
The shaft work of expanding machine output simultaneously improves stream pressure；Mixer is used to be delivered to No.1 storage tank after mixing two strands of refrigeration working mediums；
No.1 storage tank and No. two storage tanks are equipped with supplement working medium tube for the circularly cooling agent circulating pressure and flow in control system
Road, for supplementing refrigeration working medium into system as needed.
The level-one chilldown system includes blower, No. three precool heat exchanger devices, No. two gas-liquid separators and corresponding pipeline valve
The auxiliary equipments such as door, measuring instrument.Gas containing VOCs enters No. three precool heat exchanger devices after blower is pumped, and changes with the low temperature gas that backflows
Enter No. two gas-liquid separators after heat, the water condensation in gas component is separated into discharge, remaining gas inputs second level pre-cooling defrosting
System.Particularly, drop requirements needed for Fan Selection should be able to meet system stable operation.
The second level pre-cooling includes two precool heat exchanger devices, electric T-shaped valve and corresponding pipeline, monitor except defrosting system
The auxiliary equipments such as table.Electric T-shaped valve is used to control the flow channel of the gas containing VOCs, and frosting pressure drop increase reaches in channel
The precool heat exchanger device of switch operating when critical pressure is set, and the air input and output at two precool heat exchanger device both ends of control
Journey, after frosting stops input gas containing VOCs in precool heat exchanger device, control electric T-shaped valve is inputted into the precool heat exchanger device
Hot-air carries out purging defrosting to device channels.
The VOCs main heat exchange system include main heat exchanger, No. three gas-liquid separators, cryogenic pump and corresponding pipeline valve,
The auxiliary equipments such as measuring instrument.Particularly, gas containing VOCs heat exchange cooling and separation removal VOCs component after be returned to level-one,
Second level chilldown system is pre-chilled new input VOCs gas using air-flow cooling capacity.Particularly, the VOCs is classified recovery system
In the precool heat exchanger device and main heat exchanger being inside related to, gas containing VOCs and heat-exchange working medium are counter-current flow.
The cold box interior includes expanding machine, No. two precool heat exchanger devices, expansion valve, No.1 gas-liquid separation in refrigeration system
Device and main heat exchanger, No. three gas-liquid separators, cryogenic pumps in VOCs main heat exchange system；Particularly, it is filled out in ice chest shell interlayer
Filled with pearlife and vacuumize to reduce cold damage.
Further, the level-one chilldown system and second level pre-cooling are except in defrosting system, two gas-liquid separator internal upper parts are
Gas circulation layer, has pipeline to be switched to next stage heat-exchange system；Lower part is condensate liquid storage layer, has pipeline to connect and by control valve
Adjust condensate liquid output flow.The difference of VOCs component and content according to handled by system, can be according to actual needs in gas-liquid
Gas vent nearby adds silk screen in separator, prevents from taking away the feelings that condensate liquid can not separate in time in drop or air-flow because of air-flow
Condition；Particularly, the boiling point of VOCs component as handled by system is higher, may in No. two gas-liquid separators in level-one chilldown system
There is the case where VOCs gas component condenses simultaneously with water, No. two gas-liquid separators outlets can be connected to bulk processing recycling at this time
Point separates and recovers condensate liquid component again.
Compared with existing invention and technology, the invention has the benefit that
1, refrigeration working medium is to be recycled in refrigeration system, and without persistently inputting cooling medium, and process of refrigerastion utilizes section
Stream expansion reaches deep cooling low temperature, and required compressor and expanding machine power are smaller, and equipment volume scalp is at low cost.
2, multistage comprehensive utilization has been carried out to the cooling capacity of each link in system flow, and low-temperature heat exchange process is in ice chest
Interior completion, the cold damage of system is small, energy-efficient, substantially reduces operating cost.
3, second level pre-cooling removes the design of defrosting system, and gas containing VOCs can not only be pre-chilled, and improves the energy benefit of system
Refrigerated separation again is carried out with rate, and to the residual moisture in air-flow component, it is ensured that is passed through in the air-flow of next stage heat-exchange system
Without considering the influence of moisture, the recycling precision of VOCs gas is improved.And two precool heat exchanger devices alternately defrost, and system can be improved
The safety and stability of operation is convenient for equipment debugging and maintenance.
4, recovery process and method are not limited by conditions such as source gas concentration, component, flows, are generally applicable to industry
The waste gas recovery processing links of production.
Detailed description of the invention
Fig. 1 is 1 flow chart of the embodiment of the present invention.
Fig. 2 is second level pre-cooling defrosting system flow schematic diagram in the present invention.
Specific embodiment
With reference to the accompanying drawings of the specification and specific embodiment, the present invention is described in detail.Obviously, described implementation
Example is only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Cryogenic recovery system flow diagram, including refrigeration system, level-one are classified as shown in Figure 1 for the VOCs of embodiment 1
Chilldown system, second level pre-cooling remove defrosting system, VOCs main heat exchange system and ice chest 22.Refrigeration system includes No.1 compressor 1, No.1
Cooler 2, No.1 precool heat exchanger device 3, No. two precool heat exchanger devices 4, expansion valve 5, No.1 gas-liquid separator 6, mixers 7, No.1
The compressor 9, two of storage tank 8, two cooler 10, the storage tank 13 of compressor 12, two of expanding machine 11, three；Level-one chilldown system
Including the gas-liquid separator 16 of precool heat exchanger device 15, two of blower 14, three；Second level pre-cooling includes No. four precool heat exchangers except defrosting system
17, No. five precool heat exchanger devices 18 of device and corresponding switch valve；VOCs main heat exchange system includes 19, No. three gas-liquids of main heat exchanger point
From device 20, cryogenic pump 21.
Refrigeration working medium selects nitrogen in the present embodiment, and when system works, refrigeration working medium is first compressed liter by No. two compressors 9
Temperature is cooled to 20 DEG C or so after No. two 10 water coolings of cooler, into being pre-chilled in No. two precool heat exchanger devices 4 in ice chest 22
Cooling, after low-temp low-pressure gaseous refrigerant working medium obtained by the expansion of expanding machine 11, return in No. two precool heat exchanger devices 4 to heat transfer process
Cooling capacity is provided；Low pressure room temperature refrigeration working medium after heat exchange is passed through No. two storage tanks 13 after No. three 12 primary compressions of compressor, control
Enter No. two compressors 9 after flow to recycle again.Refrigeration working medium is forced into 5MPa by No.1 compressor 1, obtained high temperature and pressure
Gaseous refrigerant working medium is passed through and carries out the normal temperature high voltage gaseous refrigerant that water cooling exchanges heat to 20 DEG C or so, after cooling in No.1 cooler 2
Working medium is passed through No.1 precool heat exchanger device 3, is carried out using the cooling capacity that main heat exchanger 19 exports the refrigeration working medium of lower temperature preliminary pre-
It is cold；Gaseous high pressure refrigeration working medium after pre-cooling is output and then enter No. two precool heat exchanger devices 4 by No.1 precool heat exchanger device 3, and utilization is swollen
The cooling capacity of the gaseous state low-temp low-pressure refrigeration working medium obtained behind the swollen outlet of machine 11 and 5 throttling expansion of expansion valve carries out heat exchange cooling.It is high
Normal pressure and temperature refrigeration working medium is converted into high pressure low temperature liquid form after heat exchange is cooling, be cooled to after expanded 5 throttling expansion of valve-
170 DEG C or so are passed through No.1 gas-liquid separator 6.The liquid outlet of No.1 gas-liquid separator 6 is by deep cooling low temperature liquid refrigeration working medium
It is delivered in the main heat exchanger 19 in VOCs main heat exchange system, carrying out heat exchange with gas containing VOCs makes it be cooled to -160 DEG C of left sides
The right side carries out cryogenic separation to VOCs component therein；- 30 DEG C or so of the cryogenic refrigeration working medium that main heat exchanger 19 exports is passed through one
Number precool heat exchanger device 3 provides cooling capacity, and mixer 7 is sent into after heat exchange.The gas vent of No.1 gas-liquid separator 6 will be after throttling expansion
The cryogenic gaseous refrigeration working medium of -170 DEG C obtained is passed through in No. two precool heat exchanger devices 4, is provided cooling capacity to precool heat exchanger process, is changed
Mixer 7 is sent into after heat.Mixer 7 is delivered to No.1 storage tank 8 after mixing two strands of refrigeration working mediums, enter No.1 after controlling flow
Compressor 1 recycles again.Setting pressure-detecting device and volume control device in No.1 storage tank 8 and No. two storage tanks 13, regulate and control defeated
Enter the flow parameter of No.1 compressor 1 and No. two compressors 9, and in system boot and system when the reduction of gas circulating pressure,
Refrigeration working medium is supplemented into system from supplement working medium pipeline.
Gas containing VOCs from production link backflows after blower 14 is pumped and is passed through No. three precool heat exchanger devices 15 with low temperature
Gas, which tentatively exchanges heat, is cooled to 2 DEG C~4 DEG C, is passed through No. two gas-liquid separators 16 the most of moisture condensation in gas component is de-
It removes.Gas after separation is passed through No. four precool heat exchanger devices 17, backflows after gas exchanges heat with low temperature and is cooled to -27 DEG C or so；If air-flow
In still have residual moisture, then will at this temperature frosting be detached from mainstream.Gas containing VOCs after secondary pre-cooling is passed through in ice chest 22
Main heat exchanger 19 in, exchange heat with low temperature liquid refrigeration working medium, so that VOCs component in air-flow is cooled down condensation, in No. three gas-liquids point
From discharge is separated in device 20, the VOCs content of primary air is made to reach national organic exhaust gas discharge standard.Cryogenic gas after heat exchange
It backflows after being exported from No. three gas-liquid separators 20 and is passed through No. four precool heat exchanger devices 17 and No. three precool heat exchanger devices 15, it is cold using air-flow
It measures and heat exchange pre-cooling is carried out to the gas containing VOCs to be processed of input recovery system, be finally discharged into from No. three outlets of precool heat exchanger device 15
Atmosphere terminates heat exchange process.
It is illustrated in figure 2 the flow diagram that second level pre-cooling removes defrosting system.When system works, containing after upper level pre-cooling
VOCs gas controls No. four precool heat exchanger devices 17 of input through electric T-shaped valve 23, backflows after gas exchanges heat with low temperature and is cooled to -27 DEG C
Left and right is delivered to VOCs main heat exchange system through the control of electric T-shaped valve 24；Low temperature backflows gas through the control input of electric T-shaped valve 25
No. four precool heat exchanger devices 17, and send after gas converting heat containing VOCs to level-one chilldown system.If there are residual moisture in VOCs air-flow,
It condensation can be attached in No. four 17 channels of precool heat exchanger device, be set when the more resistance increase pressure drop increase of frosting reaches at this temperature
When counting critical value, electric T-shaped valve 23,24,25 automatically switches current path: air-flow containing VOCs is passed through after electric T-shaped valve 23
VOCs main heat exchange system is passed through through electric T-shaped valve 24 after No. five precool heat exchanger devices 18, with gas heat exchange of backflowing；Low temperature backflow gas warp
The control of electric T-shaped valve 25 is passed through No. five precool heat exchanger devices 18, and is sent after gas converting heat containing VOCs to level-one chilldown system.At this time
VOC free s gas inputs in No. four precool heat exchanger devices 17, and electric T-shaped valve 26,27 opens purge gass access, to No. four precool heat exchangers
It is passed through thermal purging device in device 17 and carries out purging defrosting, valve is closed after defrosting operation and stops hot blow scavenging input.At No. five
When frosting pressurization reaches critical value in precool heat exchanger device 18, electric T-shaped valve 23,24,25 switches VOCs current path again,
Precool heat exchanger operation is carried out in No. four precool heat exchanger devices 17, and open 26,27 pairs of No. five precool heat exchanger devices 18 of electric T-shaped valve into
Row purging defrosting, so switches, and two precool heat exchanger devices work alternatively, and guarantees that the continuous-stable of production carries out.
The technical solution of embodiment described above can only all be considered the description of the invention and cannot limit the present invention,
Claims indicate protection scope of the present invention, and any in the comparable meaning and scope of claims of the present invention changes
Become, in the range of belonging to claims of the present invention, should all receive respect and protection.
Claims (10)
1. a kind of VOCs of throttling expansion refrigeration is classified cryogenic recovery system, it is characterised in that: include ice chest and four subsystems:
Refrigeration system, level-one chilldown system, second level pre-cooling remove defrosting system, VOCs main heat exchange system.
2. the VOCs of throttling expansion refrigeration according to claim 1 is classified cryogenic recovery system, it is characterised in that: the system
Cooling system includes compressor, expanding machine, cooler, mixer, precool heat exchanger device, expansion valve, gas-liquid separator, storage tank.No.1
Compressor outlet channel is sequentially connected No.1 cooler, No.1 precool heat exchanger device, No. two precool heat exchanger devices, expansion valve, No.1 gas
Liquid/gas separator；The liquid outlet of No.1 gas-liquid separator is sequentially connected main heat exchanger in VOCs main heat exchange system, refrigeration system
No.1 precool heat exchanger device and mixer, gas vent enter No. two precool heat exchanger devices after be connected to mixer；Mixer is by two
It is delivered to No.1 storage tank after fluid streams mixing, No.1 compressor is returned to by No.1 storage tank.No. two compressor outlet channels successively connect
Connect No. two coolers, No. two precool heat exchanger devices, expanding machines；Expander outlet is connected to No. three pressures after being passed through No. two precool heat exchanger devices
Contracting machine is delivered to No. two storage tanks after compression, return to No. two compressors by No. two storage tanks.
3. the VOCs of throttling expansion refrigeration according to claim 1 is classified cryogenic recovery system, it is characterised in that: the system
In cooling system, by the cryogenic refrigeration working medium that is obtained after expander and No.1 gas-liquid separator gas vent by expansion valve section
The cryogenic refrigeration working medium obtained after stream expansion provides cooling capacity, and No.1 compressor and No. two compressors is made to export and be cooled down by cooler
Cooling is pre-chilled in high-pressure refrigeration working medium to room temperature in No. two precool heat exchanger devices.Particularly, it is set in No.1 storage tank and No. two storage tanks
Pressure-detecting device and volume control device, the flow parameter of regulation input No.1 compressor and No. two compressors are set, and is being
When gas circulating pressure reduces in system booting and system, refrigeration working medium is supplemented into system from supplement working medium pipeline.
4. the VOCs of throttling expansion refrigeration according to claim 1 is classified cryogenic recovery system, it is characterised in that: described one
Grade chilldown system includes blower, precool heat exchanger device, gas-liquid separator.Gas containing VOCs enters No. three pre-coolings after blower is pumped and changes
Hot device backflows after gas exchanges heat with low temperature and enters No. two gas-liquid separators, the water condensation in gas component is separated discharge, residual air
Body inputs second level pre-cooling and removes defrosting system；Particularly, drop requirements needed for Fan Selection should be able to meet system stable operation.
5. the VOCs of throttling expansion refrigeration according to claim 1 is classified cryogenic recovery system, it is characterised in that: described two
Grade pre-cooling includes two precool heat exchanger devices except defrosting system, controls switching ventilation pipe by electrically operated valve, guarantee has a pre-cooling to change
Hot device is in operating status；Two precool heat exchanger device interfaces be respectively connected with hot-air input channel and emptying pipeline, convenient for pair
Equipment is defrosted and is safeguarded.
6. the VOCs of throttling expansion refrigeration according to claim 1 is classified cryogenic recovery system, it is characterised in that: described two
Grade pre-cooling removes defrosting system in normal work, only by the gas containing VOCs after upper level precooling treatment in a precool heat exchanger device
It exchanges heat with the low temperature gas that backflows, and is delivered to VOCs main heat exchange system；In operation because channel interior frosting increases pressure drop
When, electrically operated valve automatically switches pipe path after reaching setting critical pressure, will contain VOCs gas and be passed through another precool heat exchanger
Heat exchange pre-cooling is carried out in device, is passed through hot-air in the frosting precool heat exchanger device for stopping air-flow conveying and is carried out purging defrosting.
7. the VOCs of throttling expansion refrigeration according to claim 1 is classified cryogenic recovery system, it is characterised in that: described
VOCs main heat exchange system includes main heat exchanger, gas-liquid separator, cryogenic pump.Main heat exchanger outlet connection No. three gas-liquid separators into
Mouthful, the gas vent of No. three gas-liquid separators is with second level pre-cooling except the gas import phase of backflowing of two precool heat exchanger devices in defrosting system
Even, the liquid outlet of No. three gas-liquid separators is connect with cryogenic pump, and VOCs condensate liquid is exported to outside system.
8. the VOCs of throttling expansion refrigeration according to claim 1 is classified cryogenic recovery system, it is characterised in that: described cold
Include expanding machine, No. two precool heat exchanger devices, expansion valve, No.1 gas-liquid separator and the VOCs main heat exchange in refrigeration system inside case
The main heat exchanger of system, No. three gas-liquid separators, cryogenic pump and corresponding utilidor valve.It is filled in ice chest shell interlayer
Pearlife is simultaneously vacuumized to reduce cold damage.
9. the VOCs of throttling expansion refrigeration according to claim 1 is classified cryogenic recovery system, it is characterised in that: described one
Grade chilldown system, second level pre-cooling removes defrosting system and VOCs main heat exchange system is sequentially connected by one VOCs gas passage, gas warp
It backflows after the cooling removing VOCs of classification and is sent into second level pre-cooling except defrosting system and level-one chilldown system, using itself cooling capacity to new input
The gas of system is pre-chilled.Particularly, in all precool heat exchanger devices and main heat exchanger, cold fluid and hot fluid is counter-current flow.
10. being classified cryogenic recovery system to the VOCs that throttling expansion described in one of 8 is freezed according to claim 1, feature exists
In: the refrigeration system, level-one chilldown system and second level pre-cooling are except in defrosting system, three gas-liquid separator internal upper parts are gas stream
Logical layer, has pipeline to be switched to the precool heat exchanger device of next link；Lower part is condensate liquid storage layer, has pipeline to connect and by control valve
Adjust condensate liquid output flow.Gas vent nearby adds silk screen in gas-liquid separator, prevents from taking away drop or air-flow because of air-flow
The case where middle condensate liquid can not separate in time.
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