CN104857735A - Condensation adsorption recovery device of VOCs gas - Google Patents
Condensation adsorption recovery device of VOCs gas Download PDFInfo
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- CN104857735A CN104857735A CN201510291120.6A CN201510291120A CN104857735A CN 104857735 A CN104857735 A CN 104857735A CN 201510291120 A CN201510291120 A CN 201510291120A CN 104857735 A CN104857735 A CN 104857735A
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Abstract
The invention discloses a condensation adsorption recovery device of VOCs gas. The device comprises a condensation loop and a variable temperature and pressure adsorption loop, wherein the condensation loop comprises a refrigeration compressor, a condensation heat exchanger, a throttling element, a cold box heat exchanger and a gas-liquid separator; the variable temperature and pressure adsorption loop comprises a variable frequency air pump, a cold box heat exchanger, a liquid injection preventing tank, two groups of variable temperature and pressure adsorption devices which are arranged in parallel and alternately used for adsorption and analytical processing, and a vacuum pump. The device recycles and purifies various substances in organic solvent through the condensation loop and the variable temperature and pressure adsorption loop, finally enables the concentration of VOCs gas to reach milligram grade, and effectively reduces secondary pollution of a unit during operation.
Description
Technical field
What the present invention relates to is a kind of retracting device of gas, in particular a kind of condensation adsorption recovery apparatus of VOCs gas.
Background technology
Energy and environment be the world today development theme Ye Shi China development must faced by problem.Along with the enhancing of environmental consciousness and the requirement of sustainable development, VOCs gas reclaims, control will be subject to increasing attention.The volatilization of VOCs gas is present in the production of petrochemical industry, handling, storage, the links such as canned, such as: the places such as refinery, coke-oven plant, PO, PX depots.
Because VOCs volatile organic matter is very easy to volatilization in the processes such as production, storage, transport, sale, use, thus produce very serious VOCs gas fixed discharge source, not only cause resources loss, more constitute potential fire hazard, simultaneously hazardous VOCs gas severe contamination environment, harm worker's is healthy.
It is investigated, name is called " a kind of two-stage benzene class organic vapor recovery device ", the patent No. is ZL201120415119.7, adopt two-stage benzene class organic vapor recovery device and the recovery method thereof of condensation process and Temp .-changing adsorption combination, its very large aspect solves benzene class organic steam to reclaim, but also have certain difference with national milligram level discharge index.
Name is called " a kind of benzene class organic vapor recovery device ", the patent No. is 201420557512.3, adopt three grades of benzene class organic vapor recovery devices that cryogenic condensation process, Temp .-changing adsorption and pressure-variable adsorption combine, which solve the discharge of benzene class organic steam milligram level, but because the reason of Temp .-changing adsorption creates secondary pollution, unit for sewage disposal system can reprocessing, and so storage and transport unit is just deeply aware of one's own helplessness when faced with a great task.
So far, the VOCs that place market not yet having ripe met petrochemical plant and coke-oven plant, PO, PX depots and transfer storage facility etc. to there is the discharge of VOCs gaseous volatilization uses reclaims and reduces secondary pollution and the device of energy qualified discharge.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the object of this invention is to provide a kind ofly utilize condensation, continuous coo1ing fractional condensation that alternating temperature pressure swing adsorption realizes VOCs gas reclaims and the retracting device of qualified discharge, reclaimed and purifying VOCs gas by this device, final VOCs gas concentration reaches the requirement that GB or terrestrial reference specify, complete qualified discharge.
Technical scheme: in order to solve the problems of the technologies described above, the condensation adsorption recovery apparatus of a kind of VOCs gas provided by the invention, comprise condensing circuit, alternating temperature pressure-variable adsorption loop, described condensing circuit comprises the refrigeration compressor, condensing heat exchanger, restricting element, ice chest heat exchanger, the gas-liquid separator that sequentially connect, and described gas-liquid separator is connected with refrigeration compressor; Described ice chest exchanger base is provided with liquid outlet;
Alternating temperature pressure-variable adsorption loop comprise frequency conversion air pump, ice chest heat exchanger, liquid-proof spray cans, two groups be arranged in parallel alternately for adsorbing and alternating temperature pressure-swing absorption apparatus, the vavuum pump of dissection process; That often organizes alternating temperature pressure-swing absorption apparatus and comprise adsorption tanks, intake valve, parsing valve, air bleeding valve, back-pressure valve, described adsorption tanks comprise absorption tank body, is placed on the adsorbent of adsorption tanks intracoelomic cavity and makes adsorbent reactivation adds thermal analysis apparatus; Described oil gas entrance is connected with the entrance of frequency conversion air pump, frequency conversion wind delivery side of pump is connected with the liquid passage inlet of ice chest heat exchanger, the gas circuit outlet of ice chest heat exchanger is connected with the air inlet of absorption tank base by liquid-proof spray cans, intake valve, be connected with the import of resolving valve between the air inlet of absorption tank base and intake valve outlet, the outlet of resolving valve is connected by the entrance of vavuum pump with frequency conversion air pump; Described VOCs gas carries out cold and hot exchange at ice chest heat exchanger;
The gas outlet on described absorption tank body top is connected with high-altitude cylinder by air bleeding valve, is also connected with the outlet of back-pressure valve between the gas outlet and the air inlet of air bleeding valve of absorption tank body; The thermal analysis apparatus that adds of described alternating temperature pressure-swing absorption apparatus comprises the inner coil pipe being arranged on adsorption tanks intracoelomic cavity, and inner coil pipe adopts saturated vapor heating; The sidewall of absorption tank body is provided with first interface and the second interface; This inner coil pipe entrance point enters valve outlet port through first interface by inlet valve and steam and is connected, this inner coil pipe port of export goes out valve import through the second interface by outlet valve and steam and is connected, and by saturated vapor heat temperature raising, the VOCs gas of charcoal absorption in adsorption tanks is spun off.
As preferably, described inner coil pipe is helical form stainless steel inner coil pipe.
As preferably, between described frequency conversion wind delivery side of pump and the liquid passage inlet of ice chest heat exchanger, be connected with the first spark arrester; The second spark arrester is connected with between the entrance of described frequency conversion air pump and oil gas entrance; The 3rd spark arrester is connected with between described air bleeding valve and high-altitude cylinder.
As preferably, be arranged side by side first and change greenhouse, second and change greenhouse and the 3rd and change greenhouse in described ice chest heat exchanger, described first changes greenhouse comprises liquid passage inlet, gas circuit outlet, the first inlet channel of parallel longitudinal setting and the first return gas channel; Second changes the second inlet channel and the second return gas channel that greenhouse comprises parallel longitudinal setting, and the 3rd changes the 3rd inlet channel and the 3rd return gas channel that greenhouse comprises parallel longitudinal setting; Described liquid passage inlet forms heat exchanger channels with the first inlet channel, the second inlet channel, the 3rd inlet channel, the 3rd return gas channel, the second return gas channel, the first return gas channel, gas circuit outlet successively; Described first changes greenhouse, second changes greenhouse and the 3rd and changes the equal correspondence of greenhouse bottom and have the liquid outlet be communicated with heat exchanger channels; Described first changes greenhouse, and second changes greenhouse, and the 3rd changes greenhouse temperature reduces successively.
As preferably, described second changes greenhouse also comprises the second refrigerant pipeline parallel with the second inlet channel, the second return gas channel; Described 3rd changes greenhouse also comprises three refrigerant line parallel with the 3rd inlet channel, the 3rd return gas channel; Described restricting element comprises low temperature field restricting element, pre-awkward silence at a meeting restricting element; The import of second refrigerant pipeline is communicated with condensing heat exchanger by pre-awkward silence at a meeting restricting element, and the outlet of second refrigerant pipeline is communicated with gas-liquid separator by evaporating pressure regulating valve; The import of described 3rd refrigerant line is communicated with condensing heat exchanger by low temperature field restricting element, and the outlet of the 3rd refrigerant line is communicated with gas-liquid separator.
As preferably, described first changes greenhouse, second, and to change the width changing greenhouse in greenhouse and the 3rd be 1:1:1.5 ~ 2; Described each liquid outlet place is equipped with switch valve.Adopt this width that gas can be made to change abundant condensation in greenhouse the 3rd.
As preferably, described refrigeration compressor, vavuum pump are respectively explosion-proof refrigeration compressor, anti-explosion vacuum pump.
Described low temperature field restricting element changes greenhouse temperature for regulating the 3rd; Pre-awkward silence at a meeting restricting element changes greenhouse temperature for regulating second; Evaporating pressure regulating valve is used for stablizing second and changes greenhouse temperature and outlet evaporating pressure.
Further, the present invention is used for the recovery method of the condensation adsorption recovery apparatus of VOCs gas, comprises the following steps:
1. cryogenic condensation step: VOCs gas passes in ice chest heat exchanger by frequency conversion air pump, through the circulating cooling of condensing circuit, makes VOCs cooling gaseous fluid, and the VOCs gas of 90% ~ 95% is cooled to liquid state, is reclaimed by the liquid outlet of ice chest exchanger base;
2. adsorption treatment step: be input in adsorption tanks by the VOCs gas after cryogenic condensation step process and carry out adsorption treatment, the gas after adsorption treatment is drained in air;
3. adsorb switch step: through the switching of valve, the VOCs gas after cryogenic condensation step process is adsorbed saturated adsorption tanks and switches to from passing into and pass into other adsorption tanks and carry out adsorption treatment;
4. activating and regenerating step, comprising:
To step 3. in switch adsorb and pass into steam in the inner coil pipe of saturated adsorption tanks Thermal desorption is added to adsorbent, will the VOCs desorbing gas step out in adsorbent be adsorbed on; And
Open vavuum pump to vacuumize adsorption tanks, then open back-pressure valve and pass into gas in adsorption tanks, adsorbent in adsorption tanks is carried out to the step of cool drying; And when 3. these adsorption tanks are switched the adsorption tanks as current adsorption treatment by step again, enter next adsorption treatment step;
5. recycle step: by step 4. in the desorption VOCs gas out obtained is vacuumized to adsorption tanks, be transported to the entrance of the frequency conversion air pump of front end, alternating temperature pressure-variable adsorption loop, enter next cryogenic condensation step.
As preferably, the 1. described VOCs gas of step passes in ice chest heat exchanger, changes greenhouse, second successively and changes greenhouse, the 3rd and change greenhouse and cold-producing medium carries out heat exchange process, finally obtain condensed-38 ~-32 DEG C of VOCs gases through first; Then the VOCs gas of-38 ~-32 DEG C changes greenhouse, second through the 3rd successively and changes to be input in adsorption tanks after greenhouse, first changes greenhouse warming up treatment and carry out adsorption treatment; Described second treatment temperature of changing greenhouse is 1 ~ 7 DEG C, and the 3rd treatment temperature of changing greenhouse is-38 ~-32 DEG C.
The high-temperature high-pressure refrigerant gas that condensing circuit of the present invention is produced by refrigeration compressor, be condensed into after high-pressure sub-cooled liquid through condensing heat exchanger, be transported in ice chest heat exchanger through restricting element again, cold-producing medium evaporation absorbs the heat vaporization of VOCs gas, VOCs gas is lowered the temperature and liquefies.
Inner coil pipe is spiral helicine stainless steel pipes, during parsing, saturated vapor enters valve by steam and inlet valve enters into inner coil pipe, Convective Heating adsorbing medium, realize the parsing regeneration of adsorbent, the VOCs gas obtained after resolving is through vavuum pump vacuum drawn, enter the entrance of the frequency conversion air pump of front end, alternating temperature pressure-variable adsorption loop, enter and reclaim circulation next time.After extraction terminates, open back-pressure valve introducing gas and cool drying is carried out to adsorbent, after cool drying terminates, enter next sorption cycle.
Beneficial effect: (1) is of the present invention is reclaimed and purifying VOCs gas by condensing circuit, alternating temperature pressure-variable adsorption loop, and final VOCs gas concentration reaches the requirement that GB or terrestrial reference specify, complete qualified discharge; (2) adsorbent of the present invention resolves the VOCs gas deviate from through vavuum pump vacuum drawn, enters the entrance of frequency conversion air pump, enters and reclaim circulation next time, again process, reduce the pollution of discharge; (3) in adsorption tanks of the present invention, adsorbent VOCs gas passes into saturated vapor by inner coil pipe and adds thermal desorption out, makes adsorbent again possess activity, and reduces the secondary pollution that unit is in operation; Open back-pressure valve introducing gas and cool drying activity recovery is carried out to adsorbent, avoid the waste of resource, and can not pollution be produced; (4) compact conformation of the present invention, floor space is little, and unit according to presetting fully automatic operation, can be supervised without the need to special messenger after connecting; (5) adsorption tanks of the present invention are two, and the absorption of the VOCs gas that can hocket and parsing, increase work efficiency; (6) further, the present invention adopts spark arrester prevent flame from scurrying into next link or stop flame to spread at pipeline enclosure, makes device more safe and reliable; (7) further, mechanical moving element of the present invention is explosion-proof type, and package unit and emission all meet fire-proof and explosion-proof safety standard; (8) further, be provided with in ice chest heat exchanger of the present invention and different change greenhouse, gradual change cooling can be carried out to VOCs gas, reduce frost, the more effective impurity eliminated in VOCs gas, and warming up treatment can be carried out to condensed gas, enter sorption cycle.
Accompanying drawing explanation
Fig. 1 is the structural representation of the condensation adsorption recovery apparatus of VOCs gas of the present invention;
Fig. 2 is the structural representation comprising the condensation adsorption recovery apparatus of the VOCs gas of spark arrester of the present invention;
Fig. 3 is adsorption tanks structural representation of the present invention.
In Fig. 1-2, 101-refrigeration compressor, 102-condensing heat exchanger, 103-low temperature field restricting element, the pre-awkward silence at a meeting restricting element of 104-, 105-ice chest heat exchanger, 106-evaporating pressure regulating valve, 107-gas-liquid separator, 201-frequency conversion air pump, 202-first spark arrester, 203-liquid-proof spray cans, 301-vavuum pump, 302-adsorption tanks A, 303-adsorption tanks B, 304-high-altitude cylinder, 401-intake valve A, 402-intake valve B, 403-resolves valve A, 404-resolves valve B, 405-air bleeding valve A, 406-air bleeding valve B, 407-back-pressure valve, 501-steam enters valve, 502-cold water enters valve, 503-inlet valve A, 504-inlet valve B, 505-steam goes out valve, 506-cold water goes out valve, 507-outlet valve A, 508-outlet valve B.
In Fig. 3,601-gas outlet, 602-charging door, 603-adsorb tank body, 604-inner coil pipe, 605-high heat transfer special-purpose activated charcoal, 606-temperature point, 607-discharge port, 608-air inlet, the import of 609-inner coil pipe, the outlet of 610-inner coil pipe.
Detailed description of the invention
Below by accompanying drawing, technical solution of the present invention is described in detail, but protection scope of the present invention is not limited to described embodiment.
Embodiment 1: as shown in Figure 1, a kind of condensation adsorption recovery apparatus of VOCs gas comprises condensing circuit, alternating temperature pressure-variable adsorption loop, described condensing circuit comprises the refrigeration compressor 101, condensing heat exchanger 102, restricting element, ice chest heat exchanger 105, the gas-liquid separator 107 that sequentially connect, and described gas-liquid separator 107 is also connected with refrigeration compressor 101; Form the cooling cycle system closed.
Described oil gas entrance is connected with the entrance of frequency conversion air pump 201, and the outlet of frequency conversion air pump 201 is connected with the liquid passage inlet of ice chest heat exchanger 105, and the gas circuit outlet of ice chest heat exchanger 105 is connected with liquid-proof spray cans 203;
Liquid-proof spray cans 203 is connected with the air inlet bottom adsorption tanks A 302 by intake valve A 401; Be connected with the import of resolving valve A 403 between air inlet bottom adsorption tanks A 302 and intake valve A 401 export, the outlet of resolving valve A 403 is connected by the entrance of vavuum pump 301 with frequency conversion air pump 201; The gas outlet on described adsorption tanks A 302 top is connected with high-altitude cylinder 304 by air bleeding valve A 40, is also connected with the outlet of back-pressure valve 407 between the gas outlet on described adsorption tanks A 302 top and air bleeding valve A 405 air inlet; The inner coil pipe entrance point of described adsorption tanks A 302 exports with inlet valve A 503 and is connected, and inlet valve A 503 import enters that valve 501 exports respectively with steam, cold water enters valve 502 and exports and be connected; The inner coil pipe port of export of adsorption tanks A 302 is connected with outlet valve A 507 import, outlet valve A 507 export go out valve 505 import with steam respectively, cold water goes out valve 506 import and is connected;
Liquid-proof spray cans 203 is connected with the air inlet bottom adsorption tanks B 303 by intake valve B 402; Be connected with the import of resolving valve B 404 between air inlet bottom adsorption tanks B 303 and intake valve B 402 export, the outlet of resolving valve B 404 is connected by the entrance of vavuum pump 301 with frequency conversion air pump 201; The gas outlet on described adsorption tanks B 303 top is connected with high-altitude cylinder 304 by air bleeding valve B 406, is also connected with the outlet of back-pressure valve 407 between the gas outlet on described adsorption tanks B 303 top and air bleeding valve B 406 air inlet; The inner coil pipe entrance point of described adsorption tanks B 303 inner chamber exports with inlet valve B 504 and is connected, and inlet valve B 504 import enters that valve 501 exports respectively with steam, cold water enters valve 502 and exports and be connected; The inner coil pipe port of export of adsorption tanks B 303 is connected with outlet valve B 508 import, outlet valve B 508 export go out valve 505 import with steam respectively, cold water goes out valve 506 import and is connected.
As shown in Figure 2, the first spark arrester is connected with between the outlet of described frequency conversion air pump 201 and the liquid passage inlet of ice chest heat exchanger 105; The second spark arrester is connected with between the entrance of described frequency conversion air pump 201 and oil gas entrance; The 3rd spark arrester is connected with between described air bleeding valve and high-altitude cylinder 304.Described spark arrester is used for preventing flame from scurrying into next link or stoping flame to spread at pipeline enclosure.
Described adsorption tanks comprise absorption tank body, be placed on the adsorbent of adsorption tanks intracoelomic cavity and make adsorbent reactivation add thermal analysis apparatus; The described effect adding thermal analysis apparatus heats adsorbent the gas be adsorbed in adsorbent is parsed.The thermal analysis apparatus that adds of the present invention is preferably spiral helicine stainless steel inner coil pipe, utilizes and passes into the agent of saturated vapor heating adsorption.Described adsorption tanks are two groups, as shown in Figure 3, often organize adsorption tanks and comprise gas outlet 601, charging door 602, absorption tank body 603, inner coil pipe 604, high heat transfer special-purpose activated charcoal 605, temperature point 606, discharge port 607, air inlet 608, inner coil pipe import 609, inner coil pipe outlet 610, in described adsorption tanks, high heat transfer special-purpose activated charcoal 605 is special-purpose activated charcoal, its thermal conductivity is greater than 0.6W/ (mk), namely capacity of heat transmission is 6 times of normal activated carbon, and benzene adsorptive value is greater than 40.
In order to strengthen adsorption effect, the alternating temperature pressure-swing absorption apparatus alternate treatment that the present invention adopts two nested structures identical, two cover alternating temperature pressure-swing absorption apparatus comprise the adsorption tanks of two alternating sorbent and parsing.When adsorption tanks are in adsorbed state, another adsorption tanks are in parse state.When the amount of adsorbing VOCs gas in adsorption tanks reaches certain value (close to saturated), carry out absorption and resolving switching.Resolving adopts the inner coil pipe be built in adsorption tanks to be heated by saturated vapor, along with the rising of adsorbent temperature, saturated extent of adsorption reduces, thus VOCs gas is deviate from, the VOCs gas deviate from is through vavuum pump vacuum drawn, enter the entrance of the frequency conversion air pump of front end, alternating temperature pressure-variable adsorption loop, enter and reclaim circulation next time.Adsorption tanks are cylindrical steel containers, and regeneration heating inner coil pipe is equipped with in inside, is provided with adsorbing medium therebetween, adopts the adsorbents such as active carbon, silica gel, zeolite, carbon molecular sieve, can adopt the combination of multiple adsorbent.What the present invention adopted is high heat transfer special-purpose activated charcoal.
Alternating temperature pressure-swing absorption apparatus of the present invention is not limited in two groups, also can be many groups, adjust according to actual needs.
Embodiment 2: substantially identical with embodiment 1 structure, something in common is not repeated, and difference is:
Be arranged side by side first in described ice chest heat exchanger 105 to change greenhouse, second and change greenhouse and the 3rd and change greenhouse, described first changes greenhouse comprises liquid passage inlet, gas circuit outlet, the first inlet channel of parallel longitudinal setting and the first return gas channel; Second changes the second inlet channel and the second return gas channel that greenhouse comprises parallel longitudinal setting, and the 3rd changes the 3rd inlet channel and the 3rd return gas channel that greenhouse comprises parallel longitudinal setting; Described liquid passage inlet forms heat exchanger channels with the first inlet channel, the second inlet channel, the 3rd inlet channel, the 3rd return gas channel, the second return gas channel, the first return gas channel, gas circuit outlet successively; Described liquid outlet respectively correspondence is opened in first and changes greenhouse, second and change greenhouse and the 3rd and change greenhouse bottom, and described each liquid outlet is all communicated with heat exchanger channels.
Described second changes greenhouse also comprises the second refrigerant pipeline parallel with the second inlet channel, the second return gas channel; Described 3rd changes greenhouse also comprises three refrigerant line parallel with the 3rd inlet channel, the 3rd return gas channel; Described restricting element comprises low temperature field restricting element 103, pre-awkward silence at a meeting restricting element 104; The import of second refrigerant pipeline is communicated with condensing heat exchanger 102 by pre-awkward silence at a meeting restricting element 104, and the outlet of second refrigerant pipeline is communicated with gas-liquid separator 107 by evaporating pressure regulating valve 106; The import of described 3rd refrigerant line is communicated with condensing heat exchanger 102 by low temperature field restricting element 103, and the outlet of the 3rd refrigerant line is communicated with gas-liquid separator 107.Described first changes greenhouse, second, and to change the width changing greenhouse in greenhouse and the 3rd be 1:1:1.5 ~ 2; Described each liquid outlet place is equipped with switch valve.
Embodiment 3: for the recovery method of the condensation adsorption recovery apparatus of VOCs gas, comprise the following steps:
1. cryogenic condensation step: VOCs gas passes in ice chest heat exchanger by frequency conversion air pump, through the circulating cooling of condensing circuit, makes VOCs cooling gaseous fluid, and the VOCs gas of 90% ~ 95% is cooled to liquid state, is reclaimed by the liquid outlet of ice chest exchanger base;
2. adsorption treatment step: be input in adsorption tanks by the VOCs gas after cryogenic condensation step process and carry out adsorption treatment, the gas after adsorption treatment is drained in air;
3. adsorb switch step: through the switching of valve, the VOCs gas after cryogenic condensation step process is adsorbed saturated adsorption tanks and switches to from passing into and pass into other adsorption tanks and carry out adsorption treatment;
4. activating and regenerating step, comprising:
To step 3. in switch adsorb and pass into steam in the inner coil pipe of saturated adsorption tanks Thermal desorption is added to adsorbent, will the VOCs desorbing gas step out in adsorbent be adsorbed on; And
Open vavuum pump to vacuumize adsorption tanks, then open back-pressure valve and pass into gas in adsorption tanks, adsorbent in adsorption tanks is carried out to the step of cool drying; And when 3. these adsorption tanks are switched the adsorption tanks as current adsorption treatment by step again, enter next adsorption treatment step;
5. recycle step: by step 4. in the desorption VOCs gas out obtained is vacuumized to adsorption tanks, be transported to the entrance of the frequency conversion air pump of front end, alternating temperature pressure-variable adsorption loop, enter next cryogenic condensation step.
The 1. described VOCs gas of step passes in ice chest heat exchanger, changes greenhouse, second successively and changes greenhouse, the 3rd and change greenhouse and cold-producing medium carries out heat exchange process, finally obtain condensed-38 ~-32 DEG C of VOCs gases through first; Then the VOCs gas of-38 ~-32 DEG C changes greenhouse, second through the 3rd successively and changes to be input in adsorption tanks after greenhouse, first changes greenhouse warming up treatment and carry out adsorption treatment; Described second treatment temperature of changing greenhouse is 1 ~ 7 DEG C, and the 3rd treatment temperature of changing greenhouse is-38 ~-32 DEG C.
VOCs gas is passed in ice chest heat exchanger 105, again successively through condensing circuit circulating cooling, VOCs gas is made to be cooled to about-35 DEG C, the VOCs gas of about 90% ~ 95% is cooled to liquid state, reclaimed by the liquid outlet of ice chest heat exchanger 105, VOCs gas after process is dense lower, is nearly clean VOCs gas;
VOCs gas through condensing circuit process enters adsorption tanks through intake valve, utilize selective to adsorbate of adsorbent being placed on adsorption tanks inner chamber, the i.e. difference of adhesion power between each component and active carbon in VOCs gas and air Mixture, the constituent of air of difficult absorption is separated with the VOCs gas component of easily adsorbing, after having adsorbed, close the intake valve be connected with the air inlet bottom adsorption tanks, open the air bleeding valve be connected with the gas outlet at adsorption tanks top, remaining gas after absorption is discharged by high-altitude cylinder.
To the adsorption tanks completing absorption, utilize molecular activity with temperature raise and strengthen characteristic, open steam and enter valve and inlet valve, saturated vapor is entered in inner coil pipe by the entrance point of inner coil pipe and indirectly adds Thermal desorption to high heat transfer special-purpose activated charcoal, by the VOCs desorbing gas that is adsorbed in activated carbon capillary out; Heating simultaneously, is opened the vavuum pump be connected with adsorption tanks bottom air inlet, is vacuumized, and the gas of extraction is sent to the arrival end of frequency conversion air pump, enters next round and reclaims circulation, makes adsorbent obtain regeneration; Saturated vapor goes out valve by steam and discharges.After being parsed, entering valve and inlet valve by opening cold water, passing into cold water at adsorption tanks inner coil pipe, and open back-pressure valve introduce gas cool drying is carried out to adsorbent, enter next sorption cycle after cool drying terminates.
Wherein VOCs gas can adsorb in adsorption tanks, another adsorption tanks inner coil pipe passes into steam to carry out adding Thermal desorption, after being parsed, cold water is passed into by the adsorption tanks inner coil pipe that switches in of valve, and introduce clean gas cool drying is carried out to adsorbent, enter next sorption cycle after cool drying terminates.
Main operational principle of the present invention is: in the present invention, the high-temperature high-pressure refrigerant gas of being discharged by refrigeration compressor 101 during condensing circuit work enters condensing heat exchanger 102 and is condensed into high-pressure sub-cooled liquid, the vehicle repair major mixture becoming low-temp low-pressure through restricting element step-down enters ice chest heat exchanger 105, the vehicle repair major mixture of low-temp low-pressure evaporates and absorbs the heat by the VOCs gas in ice chest heat exchanger 105 in ice chest heat exchanger 105, make the benzene class organic steam flowing through ice chest heat exchanger 105, steam etc. are lowered the temperature liquefaction, cold-producing medium fully vaporize after by gas-liquid separator 107 again the compression of cooled compressor 101 enter next round circulation.
Wherein ice chest heat exchanger 105 has and multiplely changes greenhouse, and described first treatment temperature of changing greenhouse is about 22 ~ 28 DEG C, and the second treatment temperature of changing greenhouse is about 1 ~ 7 DEG C, and the 3rd treatment temperature of changing greenhouse is about-38 ~-32 DEG C.VOCs gas enters first through ice chest heat exchanger 105 and changes greenhouse, enter second through inlet channel and change greenhouse, the cold-producing medium flowed out with pre-awkward silence at a meeting restricting element 104 carries out cold and hot exchange, the temperature of gas is made to reduce to 1 ~ 7 DEG C, then enter the 3rd through inlet channel and change greenhouse, the cold-producing medium flowed out with low temperature field restricting element 103 carries out cold and hot exchange, makes the temperature of gas reduce to-38 ~-32 DEG C; Then the residual gas of-38 ~-32 DEG C changes greenhouse, second through the 3rd successively again and changes and enter first after rising again in greenhouse and change greenhouse, this part gas carries out cold and hot exchange with the VOCs gas entered through liquid passage inlet, enters second and change greenhouse after making VOCs gas cool to about 22 ~ 28 DEG C; Residual gas then absorbs heat and becomes normal temperature and enter liquid-proof spray cans.Complete machine is constantly circulated by above process, thus reaches the object of VOCs gas continuous cooling to about-35 DEG C.According to the concrete composition of VOCs gas, temperature can adjust in good time.Described first changes greenhouse also can be provided with restricting element and carry out control temperature.
Described low temperature field restricting element 103 changes greenhouse temperature for regulating the 3rd; Pre-awkward silence at a meeting restricting element 104 changes greenhouse temperature for regulating second; Evaporating pressure regulating valve 106 changes greenhouse temperature and outlet evaporating pressure for stablizing second.First changes that greenhouse, second changes greenhouse, the 3rd temperature of changing greenhouse reduces successively.Second, third changes greenhouse and shares refrigeration compressor, compare the 3rd and change greenhouse, second changes greenhouse temperature its refrigerant line pressure higher comparatively greatly, and the present invention adjusts evaporating pressure and systems stabilisation by the evaporating pressure regulating valve 106 be connected with the second second refrigerant pipeline changing greenhouse.Simultaneously, greenhouse is changed for second, the present invention carries out control to regulate second by pre-awkward silence at a meeting restricting element 104 pairs of cold-producing mediums and changes greenhouse temperature, and can change further by evaporating pressure regulating valve 106 precise fine-adjustment that refrigerant pressure realizes changing second greenhouse temperature.
VOCs gas enters in ice chest heat exchanger 105 through the liquid passage inlet of ice chest heat exchanger 105, changes greenhouse through multiple, thus reaches the object of VOCs gas continuous cooling to about-35 DEG C; Residual gas after condensation, warming up treatment enters in adsorption tanks through intake valve, utilize selective to adsorbate of the adsorbent in adsorption tanks, namely the difference of adhesion power between each component and active carbon in VOCs gas and air Mixture, makes the constituent of air of difficult absorption and the benzene class organic steam Component seperation easily adsorbed; Utilize simultaneously molecular activity with temperature raise and strengthen characteristic, Steam Heating is passed into after adsorbent is saturated, heating simultaneously, open the vavuum pump 301 be connected with adsorption tanks bottom air inlet, vacuumize, and the gas of extraction is sent to the arrival end of frequency conversion air pump 201, enter next round sorption cycle, make adsorbent obtain regeneration.
As mentioned above, although represented with reference to specific preferred embodiment and described the present invention, it shall not be construed as the restriction to the present invention self.Under the spirit and scope of the present invention prerequisite not departing from claims definition, various change can be made in the form and details to it.
Claims (7)
1. the condensation adsorption recovery apparatus of a VOCs gas, it is characterized in that: comprise condensing circuit, alternating temperature pressure-variable adsorption loop, described condensing circuit comprises the refrigeration compressor (101), condensing heat exchanger (102), restricting element, ice chest heat exchanger (105), the gas-liquid separator (107) that sequentially connect, and described gas-liquid separator (107) is connected with refrigeration compressor (101); Described ice chest heat exchanger (105) bottom offers liquid outlet;
Alternating temperature pressure-variable adsorption loop comprise frequency conversion air pump (201), ice chest heat exchanger (105), liquid-proof spray cans (203), two groups be arranged in parallel alternately for adsorbing and alternating temperature pressure-swing absorption apparatus, the vavuum pump (301) of dissection process; That often organizes alternating temperature pressure-swing absorption apparatus and comprise adsorption tanks, intake valve, parsing valve, air bleeding valve, back-pressure valve, described adsorption tanks comprise absorption tank body, is placed on the adsorbent in adsorption tanks intracoelomic cavity and makes adsorbent reactivation adds thermal analysis apparatus; Described oil gas entrance is connected with the entrance of frequency conversion air pump (201), the outlet of frequency conversion air pump (201) is connected with the liquid passage inlet of ice chest heat exchanger (105), the gas circuit outlet of ice chest heat exchanger (105) is connected with the air inlet of absorption tank base by liquid-proof spray cans (203), intake valve, be connected with the import of resolving valve between the air inlet of absorption tank base and intake valve outlet, the outlet of resolving valve is connected by the entrance of vavuum pump (301) with frequency conversion air pump (201);
The gas outlet on described absorption tank body top is connected with high-altitude cylinder (304) by air bleeding valve, is also connected with the outlet of back-pressure valve (407) between the gas outlet and the air inlet of air bleeding valve of absorption tank body; The thermal analysis apparatus that adds of described alternating temperature pressure-swing absorption apparatus comprises the inner coil pipe being arranged on adsorption tanks intracoelomic cavity; The sidewall of absorption tank body is provided with first interface and the second interface; This inner coil pipe entrance point enters valve (501) through first interface by inlet valve and steam and exports and be connected, and this inner coil pipe port of export passes the second interface and goes out valve (505) import by outlet valve and steam and be connected.
2. the condensation adsorption recovery apparatus of VOCs gas according to claim 1, is characterized in that: described inner coil pipe is helical form stainless steel inner coil pipe.
3. the condensation adsorption recovery apparatus of VOCs gas according to claim 1, is characterized in that: be connected with the first spark arrester between the outlet of described frequency conversion air pump (201) and the liquid passage inlet of ice chest heat exchanger (105); The second spark arrester is connected with between the entrance of described frequency conversion air pump (201) and oil gas entrance; The 3rd spark arrester is connected with between described air bleeding valve and high-altitude cylinder (304).
4. the condensation adsorption recovery apparatus of VOCs gas according to claim 1, it is characterized in that: be arranged side by side first in described ice chest heat exchanger (105) and changed greenhouse, second and change greenhouse and the 3rd and change greenhouse, described first changes greenhouse comprises liquid passage inlet, gas circuit outlet, the first inlet channel of parallel longitudinal setting and the first return gas channel; Second changes the second inlet channel and the second return gas channel that greenhouse comprises parallel longitudinal setting, and the 3rd changes the 3rd inlet channel and the 3rd return gas channel that greenhouse comprises parallel longitudinal setting; Described liquid passage inlet forms heat exchanger channels with the first inlet channel, the second inlet channel, the 3rd inlet channel, the 3rd return gas channel, the second return gas channel, the first return gas channel, gas circuit outlet successively; Described liquid outlet respectively correspondence is opened in first and changes greenhouse, second and change greenhouse and the 3rd and change greenhouse bottom, and described each liquid outlet is all communicated with heat exchanger channels.
5. the condensation adsorption recovery apparatus of VOCs gas according to claim 4, is characterized in that: described second changes greenhouse also comprises the second refrigerant pipeline parallel with the second inlet channel, the second return gas channel; Described 3rd changes greenhouse also comprises three refrigerant line parallel with the 3rd inlet channel, the 3rd return gas channel; Described restricting element comprises low temperature field restricting element (103), pre-awkward silence at a meeting restricting element (104); The import of second refrigerant pipeline is communicated with condensing heat exchanger (102) by pre-awkward silence at a meeting restricting element (104), and the outlet of second refrigerant pipeline is communicated with gas-liquid separator (107) by evaporating pressure regulating valve (106); The import of described 3rd refrigerant line is communicated with condensing heat exchanger (102) by low temperature field restricting element (103), and the outlet of the 3rd refrigerant line is communicated with gas-liquid separator (107).
6. the condensation adsorption recovery apparatus of VOCs gas according to claim 4, is characterized in that: described first changes greenhouse, second, and to change the width changing greenhouse in greenhouse and the 3rd be 1:1:1.5 ~ 2; Described each liquid outlet place is equipped with switch valve.
7. the condensation adsorption recovery apparatus of VOCs gas according to claim 1, is characterized in that: described refrigeration compressor (101), vavuum pump (301) are respectively explosion-proof refrigeration compressor, anti-explosion vacuum pump.
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Denomination of invention: A condensation adsorption recovery device for VOCs gas Effective date of registration: 20210917 Granted publication date: 20170811 Pledgee: Jiangsu Lishui Rural Commercial Bank Co.,Ltd. yongyang sub branch Pledgor: NANJING ALL DELIGHT REFRIGERATION EQUIPMENT Co.,Ltd. Registration number: Y2021980009516 |
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Date of cancellation: 20220923 Granted publication date: 20170811 Pledgee: Jiangsu Lishui Rural Commercial Bank Co.,Ltd. yongyang sub branch Pledgor: NANJING ALL DELIGHT REFRIGERATION EQUIPMENT Co.,Ltd. Registration number: Y2021980009516 |