CN105903311A - Gas adsorber and system and method for recycling low-boiling-point organic matter - Google Patents
Gas adsorber and system and method for recycling low-boiling-point organic matter Download PDFInfo
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- CN105903311A CN105903311A CN201610399602.8A CN201610399602A CN105903311A CN 105903311 A CN105903311 A CN 105903311A CN 201610399602 A CN201610399602 A CN 201610399602A CN 105903311 A CN105903311 A CN 105903311A
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- 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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
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- 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
- B01D5/0003—Condensation of vapours; Recovering volatile solvents by condensation by using heat-exchange surfaces for indirect contact between gases or vapours and the cooling medium
- B01D5/0006—Coils or serpentines
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- 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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
- B01D53/0438—Cooling or heating systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation Of Gases By Adsorption (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a gas adsorber and a system and method for recycling low-boiling-point organic matter. The gas adsorber and the system and method for recycling the low-boiling-point organic matter can be used for separating and collecting low-boiling-point volatile organic compounds in gas. The system mainly comprises an adsorption treating unit, a recycling unit, a waste gas pretreating unit, a water supply system and a control system. The adsorption treating unit is provided with two or more gas adsorbers. In the operation process, the gas adsorbers alternatively carry out adsorption work or desorption work. According to the process, organic matter is adsorbed to active carbon fiber at first, and carbon fiber is discharged through desorption work for liquefaction of recycling; compared with an existing arctive carbon fiber adsorption device on the market, the system has the advantages of being high in recycling rate, low in energy consumption and convenient to operate. The recycling device operation cost can be effectively reduced, and good social benefits and environmental benefits are obtained.
Description
Technical field
This invention relates generally to a kind of air purifying process, in particular to a kind of gas absorption
Device and the system and method for recovery low-boiling-point organic compound.
Background technology
In recent years, along with society's attention to air treating, activated carbon fiber adsorption plant is in a lot of industries
It is widely used.Owing to concrete operating mode is different, equipment configuration and process route that producer uses adjust relatively
Few, yield is low, energy consumption is big to cause a lot of low-boiling-point organic compound to reclaim.
It is only used for strengthening the reason of the background to the present invention in information above-mentioned disclosed in described background section
Solving, therefore it can include not constituting the information to prior art known to persons of ordinary skill in the art.
Summary of the invention
Introducing the concept of a series of reduced form in Summary, this will be in detailed description of the invention
Part further describes.Present invention part is not meant to attempt to limit required guarantor
The key feature of the technical scheme protected and essential features, more do not mean that attempt to determine claimed
The protection domain of technical scheme.
One main purpose of the present invention is to overcome at least one defect of above-mentioned prior art, it is provided that one
Plant the gas absorber that desorption is in hgher efficiency.
Another main purpose of the present invention is to overcome at least one defect of above-mentioned prior art, it is provided that
A kind of realize high efficiente callback low-boiling-point organic compound reclaim low-boiling-point organic compound exhaust treatment system and
Method.
For achieving the above object, the present invention adopts the following technical scheme that
According to an aspect of the invention, it is provided a kind of gas absorber, including casing and adsorption column；
Described casing is cylindrical in shape, and described casing is provided with exhaust gas inlet, waste gas outlet, the first steam port, desorption
Thing outlet and condensate outlet；It is provided with at least one described adsorption column in described casing, is positioned in described casing
Space outside described adsorption column is peripheral space；Described adsorption column includes skeleton, silk screen and adsorption layer, institute
State skeleton and there is the intake section being positioned at outer peripheral face and the gas outlet being positioned at axle head, outside described skeleton intake section
Week fixes described silk screen, and the adsorption layer that described silk screen is wound around is acf layer, described adsorption column
Described waste gas outlet is connected in gas outlet, and described first steam port connects the gas outlet of described adsorption column；Described
Casing also has the second steam port, and described second steam port connects described peripheral space, described second steam
Mouth is arranged at described casing top；When described gas absorber carries out being desorbed operation, first start described second
Steam port supplies, and the most described first steam port and described second steam port alternately supply carry out desorption and make
Industry.
According to an embodiment of the present invention, it is wherein described first steam port and described the with an air supply pipe
Two steam port supply saturated vapors, described air supply pipe are provided with drain valve, automatic pressure regulator and pressure and pass
Sensor, described pressure transducer and described automatic pressure regulator are connected to a pressure controller, control institute with this
State the first steam port and described second steam port supply gas pressure.
According to an embodiment of the present invention, wherein said first steam port is externally provided with the first control valve；Institute
State the second steam port and be externally provided with the second control valve；Described first control valve and described second control valve are all and institute
State pressure controller coupling, control described first steam port and described second steam port supply with this respectively
Steam pressure, in desorption, casing Stress control is at 80kpa-100kpa.
According to an embodiment of the present invention, wherein said casing also has an air intake, described sky
Gas entrance connects an air hose, and described air hose sucks air by a filter, and utilizes a blower fan pair
Described air intake supplies；Make at the adsorption operation of described gas absorber and desorption with described air intake
Between industry, it is dried emptying operation.
According to a further aspect in the invention, it is provided that a kind of exhaust treatment system reclaiming low-boiling-point organic compound,
Having the foregoing gas absorber of two or more, in operation, each described gas absorber is alternately
Adsorption operation or desorption operation；Described exhaust treatment system also includes recovery unit；Described recovery unit bag
Include first-stage condenser, secondary condenser, gas-liquid separator, liquid quantizer and gas condenser；Each institute
The desorption thing outlet stating gas absorber all in turn switches on to described first-stage condenser, secondary condenser, gas
Liquid/gas separator and liquid quantizer, described liquid quantizer can connect a regenerant outlet tube；Described gas
The condensate outlet of adsorber accesses from secondary condenser entrance；The gas outlet of described gas-liquid separator connects
Described gas condenser, the liquid that described gas condenser reclaims is switched to described liquid quantizer, described
The gas of gas condenser is then switched to the exhaust gas inlet of described gas absorber and reprocesses.
According to an embodiment of the present invention, the most also having waste gas pretreatment unit, having low boiling has
The waste gas of machine thing first enters back into each described gas absorber through described waste gas pretreatment unit, and described waste gas is pre-
Processing unit includes buffering packed tower, spark arrester, filter and/or heat exchanger；Described buffering packed tower goes
Moisture and precipitum in removing exhaust gas；Described filter bottom is connected liquid recovery tube, described liquid return pipe
It is switched to described liquid trap；The temperature of described waste gas is reduced with described heat exchanger, each described to improve
Gas absorber adsorption efficiency.
According to an embodiment of the present invention, wherein said first-stage condenser and secondary condenser are water-cooled
Cooler condenser, cooling water tube is first switched to described secondary condenser, then by described secondary condenser
Connect described first-stage condenser；And the CWR of described secondary condenser is condensed by described one-level
Device is outwards connected.
According to an embodiment of the present invention, wherein said gas condenser coil condenser, described gas
The gas passed through is cooled to subzero 20 to subzero 80 degrees Celsius by condenser, flow speed control the 2m/ second with
In.
According to an embodiment of the present invention, wherein said first-stage condenser is pipe bundle condenser, described two
Level condenser is spiral lamina condenser；Described liquid quantizer top is provided with one and is communicated to the condensation of described gas
The exhaustor of device.
According to a further aspect in the invention, it is provided that a kind of method reclaiming low-boiling-point organic compound, its application is such as
The exhaust treatment system reclaiming low-boiling-point organic compound described in before；Each described gas absorber is divided into first group
Gas absorber and second group of gas absorber, it is characterised in that comprise the steps:
Waste gas containing low-boiling-point organic compound enters described exhaust treatment system through air supply pipe；
Waste gas containing low-boiling-point organic compound is passed through described first group of gas absorber and carries out adsorption operation；
After described first group of gas absorber runs adsorption operation certain time, switch to described second group of gas
Body adsorber runs adsorption operation；
Described first group of gas absorber and second group of gas absorber alternately adsorption operation；
After described first group of gas absorber or second group of gas absorber adsorption operation, carry out absorption next time
Before operation, carry out being desorbed and drying operation, in desorption operation, first start described second steam port supply,
The most described first steam port and described second steam port alternately supply carry out being desorbed operation；Desorption operation is complete
It is passed through dry air after one-tenth and carries out cooling and drying operation；
The gas produced in described drying operation directly empties.
As shown from the above technical solution, the present invention gas absorber and reclaim low-boiling-point organic compound system
With the advantage of method and having the active effect that
When gas absorber in above-described embodiment carries out being desorbed operation, first start the second steam port supply one
Fixing time, the first steam port supply carries out being desorbed operation afterwards, and waste gas so can be avoided in peripheral space
Residual.When carbon fiber adsorption and catalytic combustion layer Organic substance is close to or up time saturated, saturated vapor is utilized to heat
Activated carbon.The Organic substance adsorbed by NACF provides heat, improves its kinetic energy and breaks away from adsorbent
Constraint, and then discharged by stripping, and form vaporific gas-liquid mixture with water vapour, at water vapour
Promotion under, discharge adsorber with complete desorption, so, can absorption at the end of reduce residue non-condensing
The amount of gas, and in desorption operation, reduce the amount of incondensable gas in steam so that incondensable gas shadow
Ring and reduce, improve desorption and the efficiency of absorption with this.
The system and method reclaiming low-boiling-point organic compound provided in the embodiment of the present invention, first inhales Organic substance
It is attached in activated carbon fiber, then by reclaiming after desorption operation discharge, the existing activated carbon fiber with on market
Adsorbent equipment is compared, and has the response rate high, and energy consumption is low, easy to operate feature.Can effectively reduce back
Receiving apparatus operating cost, has good social benefit and environmental benefit.
Accompanying drawing explanation
By being considered in conjunction with the accompanying following the following detailed description of the embodiment of the present invention, the present invention's is each
Plant target, feature and advantage will become apparent from.Accompanying drawing is only the exemplary diagram of the present invention,
It is not necessarily drawn to scale.In the accompanying drawings, same reference represents same or similar all the time
Parts.Wherein:
Fig. 1 is according to a kind of exhaust-gas treatment reclaiming low-boiling-point organic compound shown in an illustrative embodiments
System, it is shown that the wherein composition schematic flow sheet of adsorption treatment unit.
Fig. 2 is according to a kind of exhaust-gas treatment reclaiming low-boiling-point organic compound shown in an illustrative embodiments
System, it is shown that the wherein composition schematic flow sheet of recovery unit.
Fig. 3 is according to a kind of exhaust-gas treatment reclaiming low-boiling-point organic compound shown in an illustrative embodiments
System, it is shown that the wherein composition schematic flow sheet of waste gas pretreatment unit.
Fig. 4 is the cross-sectional view according to a kind of adsorber shown in an illustrative embodiments.
Wherein, description of reference numerals is as follows:
1, adsorber；11, exhaust gas inlet；12, waste gas outlet；13, the first steam port；14, de-
Addendum exports；15, condensate outlet；16, air intake；17, casing；18, adsorption column；181、
Skeleton；182, silk screen；183, adsorption layer；184, intake section；185, gas outlet；19, second steams
Steam ports；2, air supply pipe；21, drain valve；22, automatic pressure regulator；23, pressure transducer；24、
First control valve；25, the second control valve；3, flue gas leading；31, buffering packed tower；32, spark arrester；
33, filter；34, heat exchanger；4, air hose；41, filter；42, drying air fan；43、
Drying control valve；5, recovery tube；51, first-stage condenser；52, secondary condenser；53, gas-liquid is divided
From device；54, liquid quantizer；55, gas condenser；56, layering groove；57, muffler；58、
Cooling water tube；59, CWR.
Detailed description of the invention
It is described more fully with example embodiment referring now to accompanying drawing.But, example embodiment can
Implement in a variety of forms, and be not understood as limited to embodiment set forth herein；On the contrary, it is provided that this
A little embodiments make the present invention will fully and completely, and the design of example embodiment are passed on all sidedly
To those skilled in the art.Reference identical in figure represents same or similar structure, thus will
Omit their detailed description.
Fig. 1 is according to a kind of exhaust-gas treatment reclaiming low-boiling-point organic compound shown in an illustrative embodiments
System, it is shown that the wherein composition schematic flow sheet of adsorption treatment unit.Fig. 2 is according to an exemplary reality
Execute a kind of exhaust treatment system reclaiming low-boiling-point organic compound shown in mode, it is shown that wherein recovery unit
Composition schematic flow sheet.Fig. 3 is to have according to a kind of low boiling that reclaims shown in an illustrative embodiments
The exhaust treatment system of machine thing, it is shown that the wherein composition schematic flow sheet of waste gas pretreatment unit.
As shown in Figure 1 to Figure 3, the embodiment of the present invention provides at a kind of waste gas reclaiming low-boiling-point organic compound
Reason system, can be used for the low boiling volatile organic matter separating and collecting in gas, mainly includes adsorption treatment
Unit, recovery unit, waste gas pretreatment unit, water system and control system.Adsorption treatment unit has
There is two or more gas absorber 1, in operation, each gas absorber 1 alternately adsorption operation or de-
Attached operation.
Following defect for existing adsorber: if waste gas containing free little water droplet more in the case of, existing suction
The adsorption column of adnexa will be the most saturated, and adsorption efficiency can be substantially reduced.During desorption, if incoagulable air
Mixing with organic steam, entirety will become to be difficult to condense, and the response rate reduces.To this end, the present invention is given
The specific embodiment of following adsorber.
Fig. 4 is the cross-sectional view according to a kind of adsorber shown in an illustrative embodiments.As
Shown in Fig. 4, the present invention implements to provide a kind of gas absorber 1, mainly includes casing 17 and adsorption column
18.1-12 adsorption column 18 can be had in each casing 17.Casing 17 is cylindrical in shape, and casing 17 sets
There are exhaust gas inlet 11, waste gas outlet the 12, first steam port 13, desorption thing outlet 14 and condensate outlet
15；It is provided with at least one adsorption column 18 in casing 17, in casing 17, is positioned at the space outside adsorption column 18
For peripheral space.In specific embodiment, peripheral space fixing fabric structure is in less scope, and such as footpath is poor
Control at 100-150mm, the amount of residue incondensable gas can be reduced at the end of absorption, and make at desorption
Industry reduces the amount of incondensable gas in steam so that incondensable gas impact reduces, and improves desorption with this
And the efficiency of absorption.
Adsorption column 18 is annular, and adsorption column 18 mainly includes skeleton 181, silk screen 182 and adsorption layer 183.
Skeleton 181 may be selected to be stainless steel.Skeleton 181 has intake section 184 and the position being positioned at outer peripheral face
In the gas outlet 185 of axle head, the periphery of intake section 184 is fixed with silk screen 182, and silk screen 182 is wound around
Adsorption layer 183 be acf layer, waste gas outlet 12 is connected in the gas outlet 185 of adsorption column 18,
First steam port 13 connects the gas outlet 185 of adsorption column 18.Industrial waste gas containing organic substance, passes through
During bed of activated carbon fiber, Organic substance therein can be adsorbed by Carbon fibe, retain, so that waste gas obtains
Purify.Wherein adsorption column 18 carbon fiber thickness is between 25cm-35cm, higher than traditional 20cm.
Also having the second steam port 19 on casing 17, the second steam port 19 connects peripheral space, and second steams
Steam ports 19 is arranged at casing 17 top；Also having an elbow in second steam port 19, this elbow is along institute
The tangential direction stating adsorption column 18 extends, in order to after steam enters casing 17, can enter in tangential
Inner space, it is therefore an objective to allow steam gradually fill full peripheral space.Gas absorber 1 carries out desorption and makees
During industry, first starting the second steam port 19 and supply certain time, the first steam port 13 supply takes off afterwards
Attached operation, so can avoid waste gas to remain in peripheral space.Two steam ports can also oppositely replace confession
Gas, improves the attached efficiency of glue with this.When carbon fiber adsorption and catalytic combustion layer 183 Organic substance is close to or up time saturated,
Utilize the heating of Activated charcoal of saturated vapor.The Organic substance adsorbed by NACF provides heat, improves
Its kinetic energy also breaks away from the constraint of adsorbent, and then discharged by stripping, and forms vaporific gas with water vapour
Liquid mixture, under the promotion of water vapour, discharges adsorber 1.
It is the first steam port 13 with an air supply pipe 2 and the second steam port 19 supplies saturated vapor, air supply pipe
Be provided with drain valve 21, automatic pressure regulator 22 and pressure transducer 23 on 2, pressure transducer 23 and from
Dynamic pressure regulator valve 22 is connected to a pressure controller, controls the first steam port 13 and the second steam port 19 with this
Supply gas pressure.First steam port 13 is externally provided with the first control valve 24；Second steam port 19 is externally provided with second
Control valve 25；First control valve 24 and the second control valve 25 all couple with pressure controller, with this respectively
Control the first steam port 13 and the steam pressure of the second steam port 19 supply, Steam pressure control in desorption
At 80kpa-100kpa.Bigger steam pressure can improve water vapour flow velocity, reduce activated carbon fiber with
The heat transfer efficiency of water vapour, water vapour absorbent core start desorption before by Air blowing casing 17.
The basic role of drain valve 21 is by condensation water, air and the carbon dioxide in vapour system
Discharge as early as possible；It is automatically prevented from the leakage of steam to greatest extent simultaneously.
Steam reducing valve be the aperture using the opening and closing element in application valve body to regulate the flow of medium, will be situated between
The pressure of matter reduces, and the effect by downstream pressure simultaneously regulates the aperture of opening and closing element, makes downstream pressure protect
Hold within the specific limits, in the case of inlet pressure is continually changing, keep outlet pressure at the model set
In enclosing, protection life thereafter produces utensil.
As shown in Fig. 1 and Fig. 4, casing 17 also having an air intake 16, air intake 16 is connected
One air hose 4, air hose 4 sucks air by a filter 41, optional with a drying control valve
43 carry out remote auto control.And utilize a drying air fan 42 that air intake 16 is supplied；With air intake
16, between the adsorption operation and desorption operation of gas absorber 1, are dried emptying operation.Through de-
Attached carbon fiber adsorption and catalytic combustion layer 183 has bigger water content and higher temperature, it is impossible to directly carry out
Adsorption operations again, needs to be dried it and cool down.Utilize drying air fan 42, to NACF bed
Layer is passed through room temperature pure air, it is possible to effectively purge out the water in adsorption layer 183, and to active carbon fibre
Dimension bed cools down, and makes temperature reduce, it is ensured that NACF replys higher absorbability.
As shown in the table, for activated carbon fiber nature parameters:
As in figure 2 it is shown, main of the recovery unit first-stage condenser 51 to be included of embodiment of the present invention offer,
Secondary condenser 52, gas-liquid separator 53, liquid quantizer 54, gas condenser 55 and layering groove
56.The desorption thing outlet 14 of each gas absorber 1 all in turn switches on to first-stage condenser 51, two grades cold
Condenser 52, gas-liquid separator 53 and liquid quantizer 54, liquid quantizer 54 can connect a regenerant
Outlet tube；The condensate outlet 15 of gas absorber 1 accesses from secondary condenser 52 entrance；Gas-liquid separation
The gas outlet of device 53 connects gas condenser 55, and the liquid that gas condenser 55 reclaims is switched to liquid
Quantizer 54, the gas of gas condenser 55 is then switched to the exhaust gas inlet 11 of gas absorber 1 to be carried out
Reprocessing.
According to a detailed description of the invention, wherein first-stage condenser 51 and secondary condenser 52 are all chosen as water
Cooling condenser, cooling water tube 58 is first switched to secondary condenser 52, then passes through secondary condenser
52 connect first-stage condenser 51；And the CWR 59 of secondary condenser 52 is condensed by one-level
Device 51 is outwards connected.First-stage condenser 51 is pipe bundle condenser, and secondary condenser 52 is that spiral lamina is cold
Condenser；Liquid quantizer 54 top is provided with an exhaustor being communicated to gas condenser 55.Cooling water supplies
Should pipe 58 supply cooling water temperature be chosen as 5 degrees centigrade.
Gas condenser 55 coil condenser, the gas passed through is cooled to subzero 20 by gas condenser 55
To subzero 80 degrees Celsius, flow speed control is within the 2m/ second.Such technique avoids steams substantial amounts of water
Vapour condenses to less than 0 degree Celsius, and can avoid freezing reaches to improve the response rate and energy-conservation purpose simultaneously.
Cryocooler is internal is coil form, and coil pipe can select many parallel connections according to actual needs, in coil pipe
Walking gas, gas moves towards from the bottom up, and pipe is outer is dry ice or other coolants.
Main technological features is, the mixture will discharged in above-mentioned desorption operation, through condensers at different levels
Heat exchange process after, the overwhelming majority gas condensation be liquid.If the organic solvent reclaimed can not be with water
Dissolve each other, then can pass through gravitational separation, organic solvent is separated, can directly or be used for after refining
Produce；If recovered solvent is miscible with water, then need to carry out special separating treatment, it is achieved You Jirong
Agent is reclaimed.
As it is shown on figure 3, the waste gas with low-boiling-point organic compound first enters back into each gas through waste gas pretreatment unit
Body adsorber 1, flue gas leading 3 the initial segment can mainly include buffer packed tower 31, spark arrester 32, filter
Device 33 and heat exchanger 34.Buffering packed tower 31 removes moisture and precipitum in removing exhaust gas；Filter 33 end
Portion connects has liquid recovery tube 5, liquid return pipe to be switched to liquid trap；Waste gas is reduced with heat exchanger 34
Temperature, gas can be cooled to less than 10 degrees Celsius by heat exchanger 34, reduces steam and noncondensing gas and contains
Amount.To improve each gas absorber 1 adsorption efficiency.Flue gas leading 3 also can have the access tube of two kinds of gases,
Such as one is that another kind is the waste gas containing low-boiling-point organic compound containing organic waste gas.Can be by controlling
Valve controls the access amount of two kinds of gases respectively.
A kind of method reclaiming low-boiling-point organic compound, the exhaust-gas treatment system of low-boiling-point organic compound is reclaimed in its application
System；Each gas absorber 1 is divided into first group of gas absorber 1 and second group of gas absorber 1, including
Following steps:
Waste gas containing low-boiling-point organic compound enters exhaust treatment system through air supply pipe 2；
Waste gas containing low-boiling-point organic compound is passed through first group of gas absorber 1 and carries out adsorption operation；
After first group of gas absorber 1 runs adsorption operation certain time, switch to second group of gas absorption
Device 1 runs adsorption operation；
First group of gas absorber 1 and second group of gas absorber 1 alternately adsorption operation；
After first group of gas absorber 1 or second group of gas absorber 1 adsorption operation, carry out absorption next time
Before operation, carry out being desorbed and drying operation, in desorption operation, first start the second steam port 19 and supply,
First steam port 13 and the second steam port 19 alternately supply carry out being desorbed operation afterwards；Desorption operation completes
After be passed through dry air and carry out cooling and drying operation；
During absorption, gas enters absorption casing 17 from side, through adsorption column 18, from adsorption column 18
Between passage upwards discharge through waste gas outlet 12.
During desorption, the waste gas outlet 12 above adsorption column 18 closes (exhaust gas inlet 11, air intake
16 are also switched off), steam enters adsorber casing 17, steam and the Organic substance being desorbed out and passes through side
Desorption thing outlet 14 entrance condensation link.
When being dried, the dry wind entrance from side enters, through adsorption column 18 above adsorption column 18
Waste gas outlet 12 flows out.
The gas produced in desorption operation enters recovery unit and carries out Organic substance recovery；Gas in drying operation
Optional directly emptying, to improve emptying and cooling efficiency.
The determination of adsorption time
According to practical condition, clearly discharge waste gas high concentration time period and the low concentration time period.Utilize
Mean concentration in the VOC detector test waste gas inlet high concentration time period, records data；In absorption
Test Organic substance high concentration time period breakthrough concentration at casing aerofluxus, rise for the time with the standby point of adsorber 1
Point, to row's mouth concentration exceed air inlet mean concentration 5% time, this time span is adsorber 1 when penetrating
Between, record time of break-through.In running operation, adsorption time can be set as slightly less than time of break-through.
The determination of desorption time
Non-molten aqueous solvent reclaims the determination of desorption time, can simply use visual method to debug.To be desorbed casing
The steam valve opening time is start time, examines desorption recovery tube 5 road visor internal solvent and waste water
Layering is led to a phenomenon, and has de-laminating solvent to discharge in a large number, and then gradually decrease after desorption a period of time, until
Suspending without layering or oil droplet in visor, go completely into aqueous phase, this time span can be approximately when being effectively desorbed
Between.It addition, can be after desorption mixed liquor fluid is steady, every 0.5min graduated cylinder samples from sample tap, takes
Sample stands after terminating, and observes liquid layered situation, to determine desorption time.
Molten aqueous solvent reclaims the determination of desorption time, rises for the time being desorbed box steam valve opening time
Point, desorption starts rear about 6min, starts to sample from sample tap after desorption mixed solution water flow stationary,
Every 0.5min takes a sample, and continuous sampling is no less than 20 groups, and sample is carried out Organic substance after terminating by desorption
Content analysis, determines desorption time under this steam flow.
If needing to change steam flow, then determine desorption time according to the sampling of above-mentioned same method, compare
After determine desorption conditions.
The determination of drying time
In conjunction with the experience of air test run, after test drying air fan 42 starts, adsorber 1 bed temperature drops
As little as time span during assigned temperature, this time is the efficient drying time, directly carries out program setting.
The regulation of layering tank liquor position
Upper strata light material density p 1, lower floor's heavier feeds density p 2.
ρ 1 (X-Z)+ρ 2Z=ρ 2Y
Z=(ρ 2Y-ρ 1X) ÷ (ρ 2-ρ 1)
Layering groove light material outlet height X at the middle and upper levels typically can regulate by a small margin, makes after regulation
Layer light material layer thickness (X-Z) maintains 5-10cm and is advisable.
The exhaust treatment system reclaiming low-boiling-point organic compound of the embodiment of the present invention and method, have recovery
Rate is high, and energy consumption is low, easy to operate feature.Can effectively reduce retracting device operating cost, have good
Good social benefit and environmental benefit.
Although disclosing the present invention with reference to some embodiment, but without departing substantially from the scope of the present invention and
On the premise of category, described embodiment can be carried out multiple variants and modifications.It will therefore be appreciated that
The invention is not limited in illustrated embodiment, its protection domain should be by the content of claims
And the structure of equivalence and scheme limit.
Claims (10)
1. a gas absorber, including casing and adsorption column；
Described casing is cylindrical in shape, and described casing is provided with exhaust gas inlet, waste gas outlet, the first steam port, takes off
Addendum outlet and condensate outlet；It is provided with at least one described adsorption column in described casing, is positioned in described casing
Space outside described adsorption column is peripheral space；
Described adsorption column includes that skeleton, silk screen and adsorption layer, described skeleton have the intake section being positioned at outer peripheral face
Be positioned at the gas outlet of axle head, described silk screen is fixed in the periphery of described skeleton intake section, and described silk screen is wound around
Adsorption layer be acf layer, described waste gas outlet is connected in the gas outlet of described adsorption column, described first
Steam port connects the gas outlet of described adsorption column；It is characterized in that,
Described casing also has the second steam port, and described second steam port connects described peripheral space, and described the
Two steam ports are arranged at described casing top, also have an elbow in described second steam port, and this elbow is along institute
The tangential direction stating attached column extends, and after steam enters described peripheral space, can enter described periphery in tangential
Space；When described gas absorber carries out being desorbed operation, first start described second steam port supply certain time,
The most described first steam port supply carries out being desorbed operation.
2. gas absorber as claimed in claim 1, it is characterised in that also have on described casing
Gas entrance, described air intake connects an air hose, and described air hose sucks air by a filter, and
Utilize a blower fan that described air intake is supplied；Make in the absorption of described gas absorber with described air intake
Between industry and desorption operation, it is dried emptying operation.
3. the exhaust treatment system reclaiming low-boiling-point organic compound, it is characterised in that there is two or more such as
Gas absorber described in claim 1 or 2, each described gas absorber alternately adsorption operation or de-
Attached operation；Described exhaust treatment system also includes recovery unit；
Described recovery unit include first-stage condenser, secondary condenser, gas-liquid separator, liquid quantizer and
Gas condenser；Each described gas absorber desorption thing outlet all in turn switch on to described first-stage condenser,
Secondary condenser, gas-liquid separator and liquid quantizer, described liquid quantizer can connect a regenerant output
Pipe；The condensate outlet of described gas absorber accesses from secondary condenser entrance；The gas of described gas-liquid separator
Described gas condenser is connected in body outlet, and the liquid that described gas condenser reclaims is switched to described liquid layered
Device, the gas of described gas condenser is then switched to the exhaust gas inlet of described gas absorber and reprocesses.
4. the exhaust treatment system reclaiming low-boiling-point organic compound as claimed in claim 3, it is characterised in that
It is described first steam port and described second steam port supply saturated vapor with an air supply pipe, on described air supply pipe
It is provided with drain valve, automatic pressure regulator and pressure transducer, described pressure transducer and described automatic pressure regulator
It is connected to a pressure controller, controls described first steam port and described second steam port supply gas pressure with this.
5. the exhaust treatment system reclaiming low-boiling-point organic compound as claimed in claim 6, it is characterised in that
Described first steam port is externally provided with the first control valve；Described second steam port is externally provided with the second control valve；Described
First control valve and described second control valve all couple with described pressure controller, control described respectively with this
The steam pressure that one steam port is supplied with described second steam port, in desorption raising middle flask body, Steam pressure control exists
80kpa-100kpa。
6. the exhaust treatment system reclaiming low-boiling-point organic compound as claimed in claim 3, it is characterised in that
Also there is waste gas pretreatment unit, there is the waste gas of low-boiling-point organic compound through described waste gas pretreatment unit the most again
Entering each described gas absorber, described waste gas pretreatment unit includes buffering packed tower, spark arrester, filtration
Device and/or heat exchanger；Described buffering packed tower removes moisture and precipitum in removing exhaust gas；Described filter bottom
Connection has liquid recovery tube, described liquid return pipe to be switched to described liquid trap；Reduce with described heat exchanger
The temperature of described waste gas, gas is cooled to less than 10 degrees Celsius by described heat exchanger, to improve each described gas
Body adsorber adsorption efficiency.
7. the exhaust treatment system reclaiming low-boiling-point organic compound as claimed in claim 3, it is characterised in that
Described first-stage condenser and secondary condenser are water cooled condenser, and cooling water tube is first switched to described
Secondary condenser, then connect described first-stage condenser by described secondary condenser；And described secondary condenser
CWR outwards connected by described first-stage condenser.
8. the exhaust treatment system reclaiming low-boiling-point organic compound as claimed in claim 7, it is characterised in that
Described gas condenser coil condenser, described gas condenser the gas passed through is cooled to subzero 20 to
Subzero 80 degrees Celsius, flow speed control is within the 2m/ second.
9. the exhaust treatment system reclaiming low-boiling-point organic compound as described in any one of claim 3 to 8, its
Being characterised by, described first-stage condenser is pipe bundle condenser, and described secondary condenser is spiral lamina condenser；
Described liquid quantizer top is provided with an exhaustor being communicated to described gas condenser.
10. the method reclaiming low-boiling-point organic compound, its application is as described in any one of claim 5 to 9
Reclaim low-boiling-point organic compound exhaust treatment system；Each described gas absorber is divided into first group of gas absorption
Device and second group of gas absorber, it is characterised in that comprise the steps:
Waste gas containing low-boiling-point organic compound enters described exhaust treatment system through air supply pipe；
Waste gas containing low-boiling-point organic compound is passed through described first group of gas absorber and carries out adsorption operation；
After described first group of gas absorber runs adsorption operation certain time, switch to described second group of gas
Adsorber runs adsorption operation；
Described first group of gas absorber and second group of gas absorber alternately adsorption operation；
After described first group of gas absorber or second group of gas absorber adsorption operation, carry out absorption next time and make
Before industry, carry out being desorbed and drying operation, in desorption operation, first start described second steam port supply, it
The most described first steam port and described second steam port alternately supply carry out being desorbed operation；After desorption operation completes
It is passed through dry air and carries out cooling and drying operation；
The gas produced in described drying operation directly empties.
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| CN201610399602.8A CN105903311B (en) | 2016-06-07 | 2016-06-07 | Gas absorber and the system and method for recycling low-boiling-point organic compound |
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| Publication number | Publication date |
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| CN105903311B (en) | 2019-07-12 |
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