CN103432862B - Recovery device and method for recovering acetone waste gas by utilizing recovery device - Google Patents
Recovery device and method for recovering acetone waste gas by utilizing recovery device Download PDFInfo
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- CN103432862B CN103432862B CN201310401923.3A CN201310401923A CN103432862B CN 103432862 B CN103432862 B CN 103432862B CN 201310401923 A CN201310401923 A CN 201310401923A CN 103432862 B CN103432862 B CN 103432862B
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Abstract
The invention discloses a recovery device and a method for recovering acetone waste gas by utilizing the recovery device. The recovery device comprises a defogging unit, an active carbon tank, a gas distribution unit, a desorption unit, a guide pipe and a PLC (Programmable Logic Controller); the top of an absorption tower is communicated with the lower part of the active carbon tank through the guide pipe; a heat exchanger and a gas inlet door are arranged on the guide pipe; an ice water pipeline is arranged on the heat exchanger; the defogging unit is arranged at the upper part in the absorption tower; a guide plate is arranged at the joint of the active carbon tank and the guide pipe; the gas distribution unit is arranged at the lower part in the active carbon tank; a gas outlet pipe is arranged on the top of the active carbon tank; a gas outlet door and a detector are arranged on the gas outlet pipe; the desorption unit comprises a gas distribution plate, a gas inlet pipe, a membrane valve and a flowmeter; a condensate discharging device, a condenser device and a storage tank connected in sequence are arranged at the bottom of the active carbon tank; a siphon pipe is arranged between the condenser device and the storage tank; and a filter device is arranged on the condensate discharging device. The recovery device and the method for recovering acetone waste gas by utilizing the recovery device disclosed by the invention are capable of absorbing water mist from waste gas in the copper clad laminate industry and recovering acetone.
Description
Technical field
The present invention relates to a kind of retracting device and utilize retracting device to reclaim the method for acetone waste gas.
Background technology
It is adopt wet production that current copper-clad plate is produced, containing 30% ~ 40% organic solvent in glue.Base material is at gluing machine impregnation drying course, and these solvents evaporate in air, forms very large pollution to environment.Contain a large amount of waste organic solvent gas to these normally directly discharge or waste gas is sent in waste gas combustion furnace, it is burnt.In response to environmental requirement and economic benefit, directly discharge has seldom had, and most of copper-clad plate factory adopts these waste gas of burning mode process.
Present stage adopts heat accumulating type heating power incinerator, and its English " Regenerative Thermal Oxidizer " by name, referred to as " RTO ".Solvent oxidation in waste gas no doubt can be become CO2 and water by RTO, but it needs power consumption to use body of heater to reach about 760 DEG C, needs to consume light diesel or natural gas, and RTO best in current society consumes diesel oil and is about 10kg/h, and equipment price is also quite expensive.Solvent oxidation in waste gas is released heat and is back to use production by RTO, but the acetone in waste gas and the much card/kg of DMF calory burning 6000, compared with diesel gas (10000 much card/kg), do not calculate very much, acetone price at least exceeds 1/3 than diesel gas at present still more.RTO heat energy recovery rate is not high, only has about 85%, and operate quite difficult, danger is very high, has had many incinerators to catch fire or explode case both at home and abroad.
Domestic comparatively ripe to DMF absorption tower technology at present, but only can reclaim the DMF in copper-clad plate industry waste gas, because wherein acetone can not reclaim, cause and do not reach economic benefit and also do not reach environmental requirement.So that this technique can not get promoting in copper-clad plate industry.
Summary of the invention
The object of the invention is to for above-mentioned the deficiencies in the prior art, provide a kind of and can also absorb water smoke except the DMF that can absorb in copper-clad plate industry waste gas and reclaim the retracting device of acetone and utilize retracting device to reclaim the method for acetone waste gas.
Technical scheme of the present invention is achieved in that a kind of retracting device, for absorbing the water smoke and acetone of discharging from absorption tower, described retracting device comprises demisting unit, active carbon groove, gas distribution unit, desorption unit, conduit, PLC, top, described absorption tower is communicated with active carbon groove bottom by conduit, described conduit is provided with heat exchanger, inlet flap, described heat exchanger is provided with frozen water pipeline; Described demisting unit is arranged on the top in absorption tower, and described demisting unit comprises at least two-layer demister; Multiple active carbon is filled with in the middle part of described active carbon groove; The junction of described active carbon groove and conduit is provided with deflector, described gas distribution unit is arranged on the bottom in active carbon groove, described gas distribution unit comprises laminates gas-bearing formation, the aperture of the laminates gas-bearing formation in described active carbon groove reduces from bottom to up successively, the top of described active carbon groove is provided with airduct of giving vent to anger, described airduct of giving vent to anger is provided with air door of giving vent to anger, detector, and described detector, inlet flap, air door of giving vent to anger are connected with PLC respectively; Described desorption unit comprises air distribution plate, air inlet pipe, diaphragm valve, flowmeter, described air distribution plate is arranged on the top in active carbon groove, described air distribution plate offers multiple steam hole, described air inlet pipe is arranged on active carbon groove top, and described diaphragm valve, flowmeter to be all arranged in air inlet pipe and to connect with PLC respectively; Described active carbon trench bottom is provided with the condensate discharging device, condenser device, the storage tank that connect successively, described condensate discharging device is communicated with storage tank, be provided with siphon pipe between described condenser device and storage tank, described condensate discharging device is provided with filter.
Preferably, the aperture of described active carbon is 1-5nm, and described active carbon is cocoanut active charcoal or hardwood sclarea.
Preferably, described active carbon groove is provided with m, m be greater than 1 natural number.
Preferably, described demisting unit comprises two-layer demister, is respectively pleat type demister, mesh mist eliminator, and the distance between described pleat type demister and active carbon groove top is greater than the distance between described mesh mist eliminator and active carbon groove top.
Preferably, described gas distribution unit comprises three layers of cloth gas-bearing formation, the Teflon cloth that No. 24 silk screens that described three floor cloth gas-bearing formations are followed successively by No. 18 silk screens that aperture is 5mm from below to up, aperture is 2.36mm, aperture are 0.15mm-0.3mm.
Preferably, be provided with temperature sensor in described active carbon groove, described active carbon groove is provided with the fire extinguisher canvas hose be communicated with active carbon groove inside, described fire extinguisher canvas hose is provided with valve, and described temperature sensor, valve connect with PLC respectively.
Preferably, described active carbon groove is closed container, and described active carbon groove is provided with U-tube, and one end of described U-tube is communicated with active carbon groove inside, and the other end of described U-tube is communicated with air, and described U-tube is built with liquid.
Utilize retracting device to reclaim a method for acetone waste gas, described retracting device is retracting device described above, comprises acetone gas and water smoke, step one in acetone waste gas, concentration 100ppm-200ppm when pre-set acetone gas is revealed on PLC, step 2, absorbs water smoke: start retracting device, and acetone gas and water smoke are successively by the pleat type demister in absorption tower and mesh mist eliminator, step 3, reduces acetone gas temperature: the acetone gas after removing water smoke through supravasal heat exchanger, and passes into frozen water in frozen water pipeline, and the acetone gas through over-heat-exchanger is cooled to 15-30 DEG C, step 4, charcoal absorption acetone gas: the acetone gas after cooling enters active carbon groove bottom by conduit, and successively through deflector, No. 18 silk screens, No. 24 silk screens and Teflon cloth, acetone gas is evenly distributed in active carbon groove, acetone gas is the charcoal absorption of 1-5nm by aperture, and the pure qi (oxygen) without acetone is discharged from airduct of giving vent to anger, step 5, desorption is carried out to active carbon: when the detector on airduct of giving vent to anger detects that the acetone gas concentration flowed out from airduct of giving vent to anger reaches 100ppm-200ppm, detector sends a signal to PLC, PLC controls inlet flap and air door of giving vent to anger is closed, diaphragm valve is opened, desorption is carried out to active carbon, described desorption mode has one-part form desorption by the control of diaphragm valve, two-period form desorption, syllogic desorption, the service life of described active carbon has early stage, mid-term, later stage, described one-part form desorption is applicable to the later stage, described two-period form desorption is applicable to mid-term, described syllogic desorption is applicable to early stage, desorption steam is evenly distributed on the activated carbon by the steam hole on air distribution plate, the desorption liquid of separating out from active carbon is discharged from the bottom of active carbon groove, step 6, reclaim acetone: the desorption liquid of discharging from active carbon trench bottom comprises the acetone of gaseous state and the mixture of the mixture of steam, the acetone of condensing state and steam, the acetone of condensing state and the mixture of steam directly enter storage tank through condensate discharging device and reclaim, acetone and the steam of gaseous state are condensed into aqueous acetone solution through condenser device again after condensate discharging device, enter storage tank reclaim finally by siphon pipe, step 7, charcoal absorption acetone: the concentration of the acetone in manual sampling or on-line monitoring storage tank, when the concentration of acetone have dropped, 3%, PLC controls inlet flap and door opening of giving vent to anger, diaphragm valve cuts out.
Preferably, in step 4, while desorption is carried out to active carbon, temperature in temperature sensor Real-Time Monitoring active carbon groove, when temperature sensor senses to the temperature in active carbon groove more than 140 DEG C time, temperature sensor transmits signals to PLC, and PLC by-pass valve control is opened, and fire water enters in active carbon groove from fire water pipeline; When temperature sensor senses drops to lower than 60 DEG C to the temperature in active carbon groove, temperature sensor sends a signal to PLC, and PLC by-pass valve control is closed.
Preferably, the desorption required time of described one-part form desorption is 60-80min, and the desorption steam flow passed through in the desorption time of described 60-80min is constant; The desorption required time of described two-period form desorption is 80-100min, be divided into first for the previous period with the first back segment time, described first for the previous period in be greater than by desorption steam flow the desorption steam flow passed through in the first back segment time; The desorption required time of described syllogic desorption is 100-120min, be divided into second for the previous period, the stage casing time, the second back segment time, described second for the previous period in the desorption steam flow that passes through be greater than the desorption steam flow passed through in the time of stage casing, the desorption steam flow passed through in the time of described stage casing is greater than the desorption steam flow passed through in the second back segment time.
The invention has the beneficial effects as follows:
In retracting device, there is following beneficial effect:
One, adds demisting unit in absorption tower, can remove the water smoke in waste gas, and passes through the setting of heat exchanger and frozen water pipeline, the temperature of acetone gas can be dropped to optimal temperature;
They are two years old, the setting of the gas distribution unit of bottom in active carbon groove, the active carbon entering middle part in active carbon groove that acetone gas can be evenly distributed, then make acetone gas can by active carbon uniform adsorption, amount of activated charcoal is there will not be to be in saturated, amount of activated charcoal is in not full state, causes the problem of the adsorption rate reducing active carbon;
Its three, whether the detector of giving vent to anger on airduct is in saturation state in order to detection of active charcoal, once detector detects that airduct of giving vent to anger has certain density acetone gas, then PLC gas air door and air door of giving vent to anger are closed, and acetone gas can not be made to enter in air;
They are four years old, PLC controlling diaphragm plate valve is opened, thus carry out desorption, Automated condtrol, can automatically regulate its desorption mode according to the service life of active carbon, save desorption steam resource, with minimum desorption steam, effective desorption is carried out to active carbon, and by the setting of air distribution plate, make desorption steam-energy reach the effect be evenly distributed;
They are five years old, by condensate discharging device, condenser device, storage tank and siphonal setting, aqueous acetone solution can be reclaimed, saved acetone resource, in addition, siphonal being arranged so that forms negative pressure in active carbon groove, accelerate desorption rate, by the setting of the filter on condensate discharging device, in order to remove the carbon dust taken out of in active carbon groove, ensure to reclaim highly purified aqueous acetone solution;
Utilizing retracting device to reclaim in the method for acetone waste gas, there is following beneficial effect:
One, acetone waste gas is successively by the pleat type demister in recovery tower and mesh mist eliminator removing water smoke, and pleat type demister and silk screen demist can remove water smoke completely, and through over-heat-exchanger, can be reduced to acetone gas temperature extremely by the temperature of adsorbing;
Its two, acetone gas enters the active carbon in active carbon groove successively from deflector, No. 18 silk screen, No. 24 silk screens and Teflon cloth, ensure that acetone gas can be evenly distributed in active carbon groove, active carbon effectively can adsorb acetone gas;
They are three years old, concentration when pre-set acetone gas is revealed on PLC, when the detector on airduct of giving vent to anger detects the acetone gas concentration flowed out from airduct of giving vent to anger, detector sends a signal to PLC, PLC controls inlet flap and air door of giving vent to anger is closed, and Automated condtrol, makes acetone gas to be tightly held by activated carbon completely, can not enter in air, reduce environmental pollution;
They are four years old, after inlet flap and air door of giving vent to anger are closed, PLC controlling diaphragm plate valve is opened, carry out desorption to active carbon, PLC can, according to the actual conditions in the service life of active carbon, select wherein a kind of mode to carry out desorption, save desorption steam resource, with minimum desorption quantity of steam, effective desorption is carried out to active carbon, and desorption steam first enters active carbon again through air distribution plate, make desorption steam-energy carry out desorption to active carbon uniformly;
They are five years old, because acetone is water-soluble and desorption steam, the desorption liquid of then discharging from charcoal trench bottom comprises the acetone of gaseous state and the mixture of the mixture of steam, the acetone of condensing state and steam, the acetone of condensing state and the mixture of steam directly enter storage tank by condensate discharging device, the acetone of gaseous state and the mixture of steam cool in the aqueous solution by condenser device again, enter storage tank by siphon pipe again, reclaim aqueous acetone solution completely, save acetone resource; In addition, the acetone of gaseous state and the mixture of steam, the acetone of condensing state and the filter of mixture first on condensate discharging device of steam, in order to remove the carbon dust of discharging in the lump with acetone gas, ensure that the purity of the acetone of recovery.
Accompanying drawing explanation
Below in conjunction with the embodiment in accompanying drawing, the present invention is described in further detail, but do not form any limitation of the invention.
Fig. 1 is the structural representation of the present embodiment.
In figure:
1-absorption tower; 2-pleat type demister; 3-mesh mist eliminator; 4-conduit; 5-heat exchanger; 6-frozen water pipeline; 7-inlet flap; 8-deflector; 9-18 silk screen; 10-No. 24 silk screens; 11-Teflon cloth; 12-gives vent to anger airduct; 13-gives vent to anger air door; 14-detector; 15-air inlet pipe; 16-diaphragm valve; 17-flowmeter; 18-air distribution plate; 19-fire extinguisher canvas hose; 20-fire water; 21-valve; 22-active carbon groove; 23-active carbon; 24-temperature sensor; 25-desorption steam; 26-condensate discharging device; 27-condenser device; 28-storage tank; 29-siphon pipe.
Detailed description of the invention
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
Consult shown in Fig. 1, a kind of retracting device, for absorbing the water smoke and acetone of discharging from absorption tower 1, retracting device comprises demisting unit, active carbon groove 22, gas distribution unit, desorption unit, conduit 4, PLC, top, absorption tower 1 is communicated with active carbon groove 22 bottom by conduit 4, conduit 4 is provided with heat exchanger 5, inlet flap 7, heat exchanger 5 is provided with frozen water pipeline 6; Demisting unit is arranged on the top in absorption tower 1, and demisting unit comprises at least two-layer demister; Multiple active carbon 23 is filled with in the middle part of active carbon groove 22; Active carbon groove 22 is provided with deflector 8 with the junction of conduit 4, gas distribution unit is arranged on the bottom in active carbon groove 22, gas distribution unit comprises laminates gas-bearing formation, the aperture of the laminates gas-bearing formation in active carbon groove 22 reduces from bottom to up successively, the top of active carbon groove 22 is provided with airduct 12 of giving vent to anger, give vent to anger on airduct 12 and be provided with air door 13 of giving vent to anger, detector 14, detector 14, inlet flap 7, air door 13 of giving vent to anger are connected with PLC respectively; Desorption unit comprises air distribution plate 18, air inlet pipe 15, diaphragm valve 16, flowmeter 17, air distribution plate 18 is arranged on the top in active carbon groove 22, air distribution plate 18 offers multiple steam hole, air inlet pipe 15 is arranged on active carbon groove 22 top, and diaphragm valve 16, flowmeter 17 to be all arranged in air inlet pipe 15 and to connect with PLC respectively; The condensate discharging device 26, condenser device 27, the storage tank 28 that connect successively is provided with bottom active carbon groove 22, condensate discharging device 26 is communicated with storage tank 28, be provided with siphon pipe 29 between condenser device 27 and storage tank 28, condensate discharging device 26 is provided with filter.
First DMF in copper-clad plate industry waste gas is adsorbed by absorption tower 1, then remaining acetone gas and water smoke in waste gas, acetone gas and water smoke pass through the demisting unit on absorption tower 1, then water smoke was removed before discharge absorption tower 1, only surplus acetone gas enters the bottom of active carbon groove 22 by conduit 4 from absorption tower 1, enter acetone gas in active carbon groove 22 successively by deflector 8, gas distribution unit, make acetone gas can enter active carbon 23 in the middle part of active carbon groove 22 uniformly from the bottom up, active carbon 23 realizes adsorbing acetone gas, inlet flap 7 on conduit 4 is controlled by PLC, the uninterrupted that the setting of inlet flap 7 enters in order to control acetone gas, the air door 13 of giving vent to anger of giving vent to anger on airduct 12 is controlled by PLC, give vent to anger the setting of air door 13 in order to control the uninterrupted of discharge of the clean gas of removing acetone, after active carbon 23 adsorbs a certain amount of acetone gas, its adsorption capacity reaches capacity, cannot the acetone gas of withhold excessive again, detector 14 is whether the clean gas of discharging from airduct 12 of giving vent to anger in order to monitoring exists acetone gas, once detector 14 detects to there is acetone gas, then detector 14 sends a signal to PLC, PLC then can control inlet flap 7, air door 13 of giving vent to anger is closed, now, acetone gas cannot enter in active carbon groove 22 again, pure qi (oxygen) also cannot be discharged in airduct 12 of giving vent to anger, PLC again controlling diaphragm plate valve 16 starts, diaphragm valve 16 is in order to control the flow velocity of desorption steam 25, the flow velocity of desorption steam 25 is selected according to service life of active carbon 23, desorption steam 25 enters the top of active carbon groove 22 from air inlet pipe 15, pass downwardly through air distribution plate 18, what desorption steam 25 was evenly distributed by the multiple steam holes on air distribution plate 18 enters saturated active carbon 23, desorption is carried out to active carbon 23, the desorption liquid of discharging bottom active carbon groove 22 comprises the acetone of gaseous state and the mixture of steam, the acetone of condensing state and the mixture of steam, the acetone of condensing state and the mixture of steam directly enter storage tank 28 through lime set discharger 26 and reclaim, the acetone of gaseous state and steam are condensed into aqueous acetone solution through condenser device 27 again after lime set discharger 26, enter storage tank 28 finally by siphon pipe 29 to reclaim, in addition, acetone liquid enters the filter on condensate discharging device 26, removes the carbon dust of discharging in the lump with acetone gas.
The aperture of active carbon 23 is 1-5nm, and active carbon 23 is cocoanut active charcoal or hardwood sclarea.Aperture is the best results that the active carbon 23 of 1-5nm absorbs acetone gas, active carbon 23 is multiple combination, as the combination that active carbon 23 can be 1nm, 2nm, 3nm, 4nm, 5nm, also can be the combination of 1nm, 2.5nm, 3.5nm, 4.5nm, 5nm, concrete combination, can determine according to the amount of absorption acetone.
Active carbon groove 22 is provided with m, m be greater than 1 natural number.In the present embodiment, m is 3, each active carbon groove 22 top is provided with air inlet pipe 15, every root air inlet pipe 15 is provided with diaphragm valve 16, each diaphragm valve 16 is all connected with PLC, when one of them active carbon groove 22 adsorbs, can carry out desorption to all the other two, PLC automatically switches, and saves time.
Wherein, demisting unit comprises two-layer demister, is respectively pleat type demister 2, mesh mist eliminator 3, and the distance between pleat type demister 2 and active carbon groove 22 top is greater than the distance between mesh mist eliminator 3 and active carbon groove 22 top.Water smoke is from absorption tower 1 successively by pleat type demister 2, mesh mist eliminator 3, and pleat type demister 2 can remove more than 5um water smoke, and mesh mist eliminator 3 can remove the water smoke of 0.1um ~ 5um.
Gas distribution unit comprises three layers of cloth gas-bearing formation, the Teflon cloth 11 that No. 24 silk screens 10 that three floor cloth gas-bearing formations are followed successively by No. 18 silk screens 9 that aperture is 5mm from below to up, aperture is 2.36mm, aperture are 0.15mm-0.3mm.The Teflon cloth 11 that No. 24 silk screens 10 that No. 18 silk screens 9 of acetone gas successively through 5mm after deflector 8 water conservancy diversion, aperture are 2.36mm, aperture are 0.15mm-0.3mm, is evenly distributed from coarse to fine.
Be provided with temperature sensor 24 in active carbon groove 22, active carbon groove 22 is provided with the fire extinguisher canvas hose 19 be communicated with active carbon groove 22 inside, fire extinguisher canvas hose 19 is provided with valve 21, temperature sensor 24, valve 21 connect with PLC respectively.Temperature sensor 24 is in order to detect the temperature in active carbon groove 22, first on PLC, predetermined temperature is set, when temperature sensor 24 temperature detected in active carbon groove 22 reaches pre-timing, then temperature sensor 24 sends a signal to PLC, and PLC by-pass valve control 21 starts, and fire water 20 imports in active carbon groove 22 from fire extinguisher canvas hose 19, realize cooling, when temperature sensor 24 detects lower than predetermined value, then temperature sensor 24 sends a signal to PLC, and PLC by-pass valve control 21 stops.
In order to prevent when reclaiming acetone, acetone gas is discharged from active carbon groove 22, then the active carbon groove 22 in the present embodiment is closed container, active carbon groove 22 is provided with U-tube, one end of U-tube is communicated with active carbon groove 22 inside, and the other end of U-tube is communicated with air, and U-tube is built with liquid.Liquid in the present embodiment is water, also can adopt other liquid, if exceed this pressure in active carbon groove 22, will extrude from U-tube, thus makes to be communicated with air in active carbon groove 22, keeps normal pressure, prolection charcoal groove 22.
Utilize retracting device to reclaim a method for acetone waste gas, retracting device is above-mentioned retracting device, comprises acetone gas and water smoke, step one in acetone waste gas, concentration 100ppm-200ppm when pre-set acetone gas is revealed on PLC, step 2, absorbs water smoke: start retracting device, and acetone gas and water smoke are successively by the pleat type demister 2 in absorption tower 1 and mesh mist eliminator 3, step 3, reduces acetone gas temperature: the heat exchanger 5 of acetone gas on conduit 4 after removing water smoke, and passes into frozen water in frozen water pipeline 6, the acetone gas through over-heat-exchanger 5 is cooled to 15-30 DEG C, step 4, active carbon 23 adsorbs acetone gas: the acetone gas after cooling enters active carbon groove 22 bottom by conduit 4, and successively through deflector 8, No. 18 silk screens 9, No. 24 silk screens 10 and Teflon cloth 11, acetone gas is evenly distributed in active carbon groove 22, the active carbon 23 that acetone gas is 1-5nm by aperture adsorbs, and the pure qi (oxygen) without acetone is discharged from airduct 12 of giving vent to anger, step 5, desorption is carried out to active carbon 23: when the detector 14 on airduct 12 of giving vent to anger detects that the acetone gas concentration flowed out from airduct 12 of giving vent to anger reaches 100ppm-200ppm, detector 14 sends a signal to PLC, PLC controls inlet flap 7 and air door 13 of giving vent to anger is closed, diaphragm valve 16 is opened, desorption is carried out to active carbon 23, desorption mode has one-part form desorption by the control of diaphragm valve 16, two-period form desorption, syllogic desorption, the service life of active carbon 23 has early stage, mid-term, later stage, one-part form desorption is applicable to the later stage, two-period form desorption is applicable to mid-term, syllogic desorption is applicable to early stage, desorption steam 25 is evenly distributed on active carbon 23 by the steam hole on air distribution plate 18, the desorption liquid of separating out from active carbon 23 is discharged from the bottom of active carbon groove 22, step 6, reclaim acetone: the desorption liquid of discharging bottom active carbon groove 22 comprises the acetone of gaseous state and the mixture of the mixture of steam, the acetone of condensing state and steam, the acetone of condensing state and the mixture of steam directly enter storage tank 28 through condensate discharging device 26 and reclaim, the acetone of gaseous state and steam are condensed into aqueous acetone solution through condenser device 27 again after condensate discharging device 26, enter storage tank 28 reclaim finally by siphon pipe 29, step 7, active carbon 23 adsorbs acetone: the concentration of the acetone in manual sampling or on-line monitoring storage tank 28, controls inlet flap 7 when the concentration of acetone have dropped 3%, PLC and gives vent to anger that air door 13 is opened, diaphragm valve 16 cuts out.The time in general early stage is within half a year, and adopt syllogic desorption, amounts of acetone and active carbon 23 weight ratio of absorption are between 10% to 5%; Time in mid-term be half a year in 1.5 years, adopt two-period form desorption, amounts of acetone and active carbon 23 weight ratio of absorption are between 3% to 5%; The time in later stage is after 1.5 years, and adopt one-part form desorption, amounts of acetone and active carbon 23 weight ratio of absorption are less than 3%.
In step 4, while desorption is carried out to active carbon 23, temperature in temperature sensor 24 Real-Time Monitoring active carbon groove 22, when temperature sensor 24 senses that temperature in active carbon groove 22 is more than 140 DEG C, temperature sensor 24 transmits signals to PLC, PLC by-pass valve control 21 is opened, and fire water 20 enters in active carbon groove 22 from fire extinguisher canvas hose 19 road; When the temperature that temperature sensor 24 senses in active carbon groove 22 drops to lower than 60 DEG C, temperature sensor 24 sends a signal to PLC, and PLC by-pass valve control 21 is closed.
The desorption required time of one-part form desorption is 60-80min, desorption steam 25 constant flow passed through in the desorption time of 60-80min; The desorption required time of two-period form desorption is 80-100min, be divided into first for the previous period with the first back segment time, first for the previous period in be greater than by desorption steam 25 flow desorption steam 25 flow passed through in the first back segment time; The desorption required time of syllogic desorption is 100-120min, be divided into second for the previous period, the stage casing time, the second back segment time, second for the previous period in desorption steam 25 flow that passes through be greater than desorption steam 25 flow passed through in the time of stage casing, desorption steam 25 flow passed through in the time of stage casing is greater than desorption steam 25 flow passed through in the second back segment time.
Above embodiment is only for illustrating technical conceive of the present invention and feature; its object is to allow person skilled in the art understand content of the present invention and to be implemented; can not limit the scope of the invention with this; all equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed in protection scope of the present invention.
Claims (10)
1. a retracting device, for absorbing the water smoke and acetone of discharging from absorption tower, it is characterized in that: described retracting device comprises demisting unit, active carbon groove, gas distribution unit, desorption unit, conduit, PLC, top, described absorption tower is communicated with active carbon groove bottom by conduit, described conduit is provided with heat exchanger, inlet flap, described heat exchanger is provided with frozen water pipeline;
Described demisting unit is arranged on the top in absorption tower, and described demisting unit comprises at least two-layer demister;
Multiple active carbon is filled with in the middle part of described active carbon groove;
The junction of described active carbon groove and conduit is provided with deflector, described gas distribution unit is arranged on the bottom in active carbon groove, described gas distribution unit comprises laminates gas-bearing formation, the aperture of the laminates gas-bearing formation in described active carbon groove reduces from bottom to up successively, the top of described active carbon groove is provided with airduct of giving vent to anger, described airduct of giving vent to anger is provided with air door of giving vent to anger, detector, and described detector, inlet flap, air door of giving vent to anger are connected with PLC respectively;
Described desorption unit comprises air distribution plate, air inlet pipe, diaphragm valve, flowmeter, described air distribution plate is arranged on the top in active carbon groove, described air distribution plate offers multiple steam hole, described air inlet pipe is arranged on active carbon groove top, and described diaphragm valve, flowmeter to be all arranged in air inlet pipe and to connect with PLC respectively;
Described active carbon trench bottom is provided with the condensate discharging device, condenser device, the storage tank that connect successively, described condensate discharging device is communicated with storage tank, be provided with siphon pipe between described condenser device and storage tank, described condensate discharging device is provided with filter.
2. retracting device according to claim 1, is characterized in that: the aperture of described active carbon is 1-5nm, and described active carbon is cocoanut active charcoal or hardwood sclarea.
3. retracting device according to claim 2, is characterized in that: described active carbon groove is provided with m, m be greater than 1 natural number.
4. retracting device according to claim 1, it is characterized in that: described demisting unit comprises two-layer demister, be respectively pleat type demister, mesh mist eliminator, the distance between described pleat type demister and active carbon groove top is greater than the distance between described mesh mist eliminator and active carbon groove top.
5. retracting device according to claim 1, it is characterized in that: described gas distribution unit comprises three layers of cloth gas-bearing formation, described three floor cloth gas-bearing formations be followed successively by No. 18 silk screens that aperture is 5mm from below to up, Teflon cloth that No. 24 silk screens that aperture is 2.36mm, aperture are 0.15mm-0.3mm.
6. the retracting device according to claim 1 or 4, it is characterized in that: in described active carbon groove, be provided with temperature sensor, described active carbon groove is provided with the fire extinguisher canvas hose be communicated with active carbon groove inside, described fire extinguisher canvas hose is provided with valve, and described temperature sensor, valve connect with PLC respectively.
7. retracting device according to claim 5, it is characterized in that: described active carbon groove is closed container, described active carbon groove is provided with U-tube, one end of described U-tube is communicated with active carbon groove inside, the other end of described U-tube is communicated with air, and described U-tube is built with liquid.
8. utilize retracting device to reclaim a method for acetone waste gas, described retracting device is retracting device according to claim 7, comprises acetone gas and water smoke, it is characterized in that in acetone waste gas:
Step one, concentration 100ppm-200ppm when pre-set acetone gas is revealed on PLC;
Step 2, absorbs water smoke: start retracting device, and acetone gas and water smoke are successively by the pleat type demister in absorption tower and mesh mist eliminator;
Step 3, reduces acetone gas temperature: the acetone gas after removing water smoke through supravasal heat exchanger, and passes into frozen water in frozen water pipeline, and the acetone gas through over-heat-exchanger is cooled to 15-30 DEG C;
Step 4, charcoal absorption acetone gas: the acetone gas after cooling enters active carbon groove bottom by conduit, and successively through deflector, No. 18 silk screens, No. 24 silk screens and Teflon cloth, acetone gas is evenly distributed in active carbon groove, acetone gas is the charcoal absorption of 1-5nm by aperture, and the pure qi (oxygen) without acetone is discharged from airduct of giving vent to anger;
Step 5, desorption is carried out to active carbon: when the detector on airduct of giving vent to anger detects that the acetone gas concentration flowed out from airduct of giving vent to anger reaches 100ppm-200ppm, detector sends a signal to PLC, PLC controls inlet flap and air door of giving vent to anger is closed, diaphragm valve is opened, desorption is carried out to active carbon, described desorption mode has one-part form desorption by the control of diaphragm valve, two-period form desorption, syllogic desorption, the service life of described active carbon has early stage, mid-term, later stage, described one-part form desorption is applicable to the later stage, described two-period form desorption is applicable to mid-term, described syllogic desorption is applicable to early stage, desorption steam is evenly distributed on the activated carbon by the steam hole on air distribution plate, the desorption liquid of separating out from active carbon is discharged from the bottom of active carbon groove,
Step 6, reclaim acetone: the desorption liquid of discharging from active carbon trench bottom comprises the acetone of gaseous state and the mixture of the mixture of steam, the acetone of condensing state and steam, the acetone of condensing state and the mixture of steam directly enter storage tank through condensate discharging device and reclaim, acetone and the steam of gaseous state are condensed into aqueous acetone solution through condenser device again after condensate discharging device, enter storage tank reclaim finally by siphon pipe;
Step 7, charcoal absorption acetone: the concentration of the acetone in manual sampling or on-line monitoring storage tank, when the concentration of acetone have dropped, 3%, PLC controls inlet flap and door opening of giving vent to anger, diaphragm valve cuts out.
9. the method utilizing retracting device to reclaim acetone waste gas according to claim 8, it is characterized in that: in step 4, while desorption is carried out to active carbon, temperature in temperature sensor Real-Time Monitoring active carbon groove, when temperature sensor senses to the temperature in active carbon groove more than 140 DEG C time, temperature sensor transmits signals to PLC, and PLC by-pass valve control is opened, and fire water enters in active carbon groove from fire water pipeline; When temperature sensor senses drops to lower than 60 DEG C to the temperature in active carbon groove, temperature sensor sends a signal to PLC, and PLC by-pass valve control is closed.
10. the retracting device that utilizes according to claim 8 or claim 9 reclaims the method for acetone waste gas, it is characterized in that: the desorption required time of described one-part form desorption is 60-80min, and the desorption steam flow passed through in the desorption time of described 60-80min is constant; The desorption required time of described two-period form desorption is 80-100min, be divided into first for the previous period with the first back segment time, described first for the previous period in be greater than by desorption steam flow the desorption steam flow passed through in the first back segment time; The desorption required time of described syllogic desorption is 100-120min, be divided into second for the previous period, the stage casing time, the second back segment time, described second for the previous period in the desorption steam flow that passes through be greater than the desorption steam flow passed through in the time of stage casing, the desorption steam flow passed through in the time of described stage casing is greater than the desorption steam flow passed through in the second back segment time.
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| CN107983087A (en) * | 2017-12-31 | 2018-05-04 | 江苏永益环保科技有限公司 | Ink prints exhaust treatment system |
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Address after: 215228 Da Xie village, Shengze Town, Wujiang District, Suzhou, Jiangsu Patentee after: Suzhou gigantic environmental protection Co., Ltd. Address before: 215000 Suzhou, Wujiang, Shengze, Jiangsu, Shengze, west two ring road 1188, China Shengze Textile Science and Technology Park 10 10, 401, 402, 403, 404 Patentee before: SUZHOU JULIAN ENVIRONMENTAL RESEARCH CO., LTD. |