CN102557868A - Method for recovering ethanol in organic waste gas of cork paper bobbin printing - Google Patents
Method for recovering ethanol in organic waste gas of cork paper bobbin printing Download PDFInfo
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Abstract
The invention discloses a method for recovering ethanol in organic waste gas of cork paper bobbin printing. A large amount of organic solvent is used in cork paper bobbin printing production process, and indoor air dirty is caused. The method comprises the following steps of collecting the waste gas, filtering, cooling, conducting secondary surface cooling, adsorbing, desorpting, conducting activated carbon regeneration, condensating, conducting gas-liquid separation and rectifying. The filtering and cooling are that high temperature waste gas is delivered to a filter through an air pipe, the waste gas passes through a primary filter sieve with 80-100meshes and a secondary filter sieve with 120-140meshes, dust and particle impurities in the waste gas are removed, then the waste gas passes through a cooler for cooling, and the temperature of the waste gas drops to less than 60-70 DEG C. the method is used for processing printing waste gas, pollution caused by direct discharge is improved, and the ethanol in the printing waste gas is effectively recovered under conditions of low cost and low energy consumption.
Description
Technical field
The present invention relates to the cleaning of organic exhaust gas, be specially the recycle method of organic exhaust gas.
Background technology
In the print production technology of yew paper, will use a large amount of organic solvents, these organic solvents are all volatilizations in the process of drying and forming-film, cause room air dirty; Influence the healthy of direct labor, behind indoor installation vent fan, though can get rid of indoor exhaust air; But, discharge after waste gas and the air mixed, can cause serious pollution to air; And these organic solvents can not be reused; Printing enterprise will drop into a large amount of funds and buy these organic solvents, has brought heavy economical load to enterprise, has also caused the huge waste of resource simultaneously.
At present, Recovery of Organic Solvent is handled, absorption process, condensation method and absorption method are generally arranged, absorption process essence is to transfer gaseous pollutant to liquid state, the later separation difficulty.Condensation method uses both economical reasonable under the organic solvent content condition with higher, and when solvent strength was rarer, subsequent recovery was just difficult relatively.Also have some enterprises to adopt absorption methods, be to printing waste gas collect, cool off, filtration, absorption, desorption, condensation, gas-liquid separation obtain getting into rectifying tower rectifying again behind the organic solvent work in-process, obtain can industrial application organic solvent.Application number is that 200910143780.4 Chinese invention patent discloses a kind of " recovery contains the method and apparatus of water-soluble organic compounds waste gas ", is to cooling off behind the gas sampling, filtering through active carbon fiber fabrics bag filtration and columnar activated carbon strainer; Cooling; Gac or carbon fiber adsorption and catalytic combustion, steam desorption, condensation; Gas-liquid separation gets work in-process, advances rectifying tower rectifying again and gets available ethanol.Owing to will adopt two kinds of strainers simultaneously, link is too much and cloth envelop collector is relatively large to the resistance of gas, causes air-flow not smooth, filters the NACF cloth bag and the gac of usefulness and changes inconvenience, and replacement cost is high.And it is relatively low that aforesaid method reclaims the ethanol work in-process concentration that obtains, and strengthened the difficulty of follow-up rectifying.
And for example application number is that the Chinese invention patent of CN200710032540.8 discloses a kind of " method and the device of organic solvent reclaimed in absorption from printing industry waste gas "; The method and the device that relate to absorption recovery organic solvent from printing industry waste gas; Two of one of adsorber of this device and adsorber is connected with water cooler with pipeline through valve respectively; Make press waste gas get into adsorber; Two of one of adsorber and adsorber also is connected with one of condensing surface with pipeline through valve, and one of condensing surface is connected with one of decanting vessel, and one of decanting vessel joins with one of storage tank; One of storage tank is connected with extraction tower through three of valve and pipeline and adsorber respectively, and extraction tower also is connected with one of decanting vessel with three of adsorber respectively.This method comprises adsorption process, desorption process, sepn process and water treatment procedure; The organic exhaust gas that contains toluene, acetone, Virahol is through active carbon adsorber absorption; After charcoal absorption is saturated; Be aided with water vapour and carry out the desorption desorb, the mixed solution that desorbs carries out oily water separation in decanting vessel.This invention adopts spark arrester to handle through needing after the general filtration, and adsorber is vertical structure, and the adsorption area of absorbent core is limited.
Summary of the invention
For overcoming the deficiency of above-mentioned background technology; It is high to the invention provides a kind of organic efficiency, simple to operate, alcoholic acid method in the recovery printing waste gas that consumes energy few; Using this method recycles the waste gas that printing produces; But the organic solvent ethanol in the effective recycling waste gas has reduced production cost, has solved the pollution from exhaust emission problem of environment.
The present invention realizes through following technical scheme: alcoholic acid method in a kind of recovery yew paper printing waste gas; May further comprise the steps: A, collection waste gas: the different quantities print couple that starts during according to operation, start blower fan, the blower motor frequency is adjusted to the 30--40 hertz; The blower fan malleation is controlled at 1.5KPa; Keep certain negative pressure near the suction opening, utilize airstream suction and the gas power of floating, printing waste gas by sucking in the airtight relatively collection room; The formation inspiratory flow is sent out outdoor again along gas exhaust duct, change strainer over to and filter.
B, filtration, cooling: high-temp waste gas is delivered to strainer through airduct; Waste gas is filtered through 80～100 purpose primary filters sieve and 120～140 purpose cascade filtrations sieve; Remove wherein dust, granule foreign, through the water cooler cooling, its temperature is dropped to below 60～70 ℃ again.
C, secondary table are cold: waste gas is not less than 70000 cubic metres vacuum fan suction through air quantity and is sent to and continues cooling in the secondary table cooler, and spent air temp is reduced to below 25～35 ℃.
D, absorption: adopt three adsorber parallel waies that waste gas is adsorbed with gaseous diffuser; Cooled waste gas sends into that one of adsorber is back to be adsorbed by the activated carbon granule absorbent core; Ethanol molecule in the printing waste gas is adsorbed on the absorbent core; When adsorbate reaches preset value, stop absorption, waste gas changes two of adsorber over to and adsorbs.
E, desorption, regeneration of activated carbon: adopt the water vapor desorption to resolve, the water vapor that vaporium is produced is passed into one of saturated adsorber of ethanol molecule absorption ethanol molecule desorption from absorbent core is come out, and becomes the mixed solution of second alcohol and water; When two adsorbate of adsorber reaches preset value, two of adsorber is carried out desorption, at this moment; Adsorbed by three of adsorber, the warm air that feeds first of adsorber carries out drying to absorbent core, the steam off valve; Feed normal temperature air again, be cooled to about 25 ℃, make regeneration of activated carbon; The rest may be inferred, an adsorber absorption, a desorption, and another then carries out manipulation of regeneration to gac, can fully guarantee the normal operation of each adsorber.
F, condensation: the mixing liquid of the gas second alcohol and water behind the desorption sent into condensation is cooled to below 40 ℃ in the condensing surface.
G, gas-liquid separation: the cooled mixture of step F condensation is separated in gas-liquid separator, and the vaporium that the gas of separating is sent into step e mixes with water vapour, and water-soluble ethanol is then sent into the underground storage sealing and deposited.
H, rectifying: but the solution of depositing is sent into the ethanol that rectifying tower rectifying gets industrial application.
Filtration among the said step B is the strainer that adopts following structure: the strainer two ends are fan housing 1 and back fan housing 2 before the doline; Be communicated with by being positioned at intermediary rectangle two logical casings; The inlet pipe of preceding fan housing 1 funnel osculum one side is provided with volume damper 3 and air quantity tensimeter 4 is arranged, and can regulate volume damper 3 according to the reading situation of air quantity tensimeter 4, to get suitable air output; A side of inlet pipe is equipped with detachable primary screen 5 in the casing, and waste gas is carried out primary filter; A side of escape pipe is equipped with detachable secondary sieve 6 in the casing, waste gas is filtered once more, and lean on an end of escape pipe to be provided with primary condenser 7 at the secondary sieve, and the waste gas after filtering is cooled off, and makes its temperature reduce to 60～70 ℃; Leave certain space in the middle of the two-stage filtration sieve, and on the pairing rectangular box in this space, be provided with observation port 8, with convenient replacing screen cloth.
Absorption among said step D, the E, desorption adopt horizontal adsorber to accomplish; Horizontal adsorber comprises that the integral body of horizontal placement is the absorption tank body 11 of cylinder type; Absorption tank body 11 middle and lower parts laterally are placed with filter 12; Activated carbon granule is positioned on the filter 12 and forms adsorption bed 13, is positioned at the vapour pipe 18 on absorption tank body 11 internal adsorption beds 13 tops, and vapour pipe 18 is provided with a plurality of equally distributed steam fumaroles 19 on " U " type and its.Also comprise the exhaust inlet pipe 14 that is positioned at absorption tank body 11 1 ends, between exhaust inlet pipe 14 and the adsorption bed 13 gas baffle is set; And the vapor pipe 16 that is positioned at absorption tank body 11 tops, the vapour-liquid collection tube 17 of bottom, the top of absorption tank body 11 is provided with 2 charcoal-adding openings 20, and the middle and lower part of the two end cap of absorption tank body 11 is provided with clean-up port 21.
Beneficial effect:1. adopt the method for the invention to handle printing waste gas, not only improved the pollution that direct discharging causes, and under the condition of low cost, less energy-consumption, effectively reclaimed the ethanol in the printing waste gas.
2. owing to adopt the adsorber of three groups of charcoal absorption core traverses of parallel connection that waste gas is carried out adsorption treatment; Utilize water vapor that saturated gac is carried out desorption again, regeneration of activated carbon is handled, and has avoided gac poor at the adsorption effect of high temperature absorption phase; The problem that Pollutant levels in the exhaust exceed standard; Technology is simple, and is easy to operate, and organic efficiency is high.
3. gas at first spreads it before getting into adsorber, makes the speed of the waste gas that gets into the charcoal absorption core more even, and total effective adsorption capacity of whole charcoal absorption core is improved.
4. through twice condensation, increased organic efficiency before behind waste gas filtering, adsorbing.
5. strainer is made up of two-stage sieve and condensing surface, has replaced cloth bag filtration and activated carbon granule strumbox, and can directly in this filtration unit, cool off waste gas after the filtration; Reduced the cost that several complete equipments are installed; But filtering net is changed every day, guarantees that air-flow is unimpeded, and efficient is expensive low.
Description of drawings
Fig. 1 utilizes schematic flow sheet for the present invention prints waste gas circulation.
Fig. 2 is a strainer three-dimensional arrangement decomposing schematic representation of the present invention.
Fig. 3 is strainer three-dimensional arrangement combination synoptic diagram of the present invention.
Fig. 4 is the horizontal adsorber three-dimensional arrangement of a present invention decomposing schematic representation.
Fig. 5 is the horizontal adsorber three-dimensional arrangement combination of the present invention synoptic diagram.
Among the figure, preceding fan housing 1, back fan housing 2, volume damper 3, air quantity tensimeter 4; Primary screen 5, secondary sieve 6, primary condenser 7, observation port 8, absorption tank body 11; Filter 12, adsorption bed 13, exhaust inlet pipe 14, vapor pipe 16, vapour-liquid collection tube 17; Vapour pipe 18, steam fumarole 19, charcoal-adding opening 20, clean-up port 21.
Specific embodiment
Embodiment 1:As shown in Figure 1, alcoholic acid method in a kind of recovery yew paper printing waste gas may further comprise the steps:
A, collection waste gas: the different quantities print couple that starts during according to operation, start blower fan, the blower motor frequency is adjusted to 30 hertz; The blower fan malleation is controlled at 1.5KPa; Keep certain negative pressure near the suction opening, utilize airstream suction and the gas power of floating, printing waste gas by sucking in the airtight relatively collection room; The formation inspiratory flow is sent out outdoor again along gas exhaust duct, change strainer over to and filter.
B, filtration, cooling: through airduct high-temp waste gas is delivered to strainer, waste gas is filtered through 80 purpose primary filters sieve and 120 purpose cascade filtrations sieve, remove wherein dust, granule foreign, through the water cooler cooling, its temperature is dropped to below 70 ℃ again.
C, secondary table are cold: waste gas is not less than 70000 cubic metres vacuum fan suction through air quantity and is sent to and continues cooling in the secondary table cooler, and spent air temp is reduced to below 35 ℃.
D, absorption: adopt three adsorber parallel waies that waste gas is adsorbed with gaseous diffuser; Cooled waste gas sends into that one of adsorber is back to be adsorbed by the activated carbon granule absorbent core; Ethanol molecule in the printing waste gas is adsorbed on the absorbent core; When adsorbate reaches preset value, stop absorption, waste gas changes two of adsorber over to and adsorbs.
E, desorption, regeneration of activated carbon: adopt the water vapor desorption to resolve, the water vapor that vaporium is produced is passed into one of saturated adsorber of ethanol molecule absorption ethanol molecule desorption from absorbent core is come out, and becomes the mixed solution of second alcohol and water; When two adsorbate of adsorber reaches preset value, two of adsorber is carried out desorption, at this moment; Adsorbed by three of adsorber, the warm air that feeds first of adsorber carries out drying to absorbent core, the steam off valve; Feed normal temperature air again, be cooled to about 25 ℃, make regeneration of activated carbon; The rest may be inferred, an adsorber absorption, a desorption, and another then carries out manipulation of regeneration to gac, can fully guarantee the normal operation of each adsorber.
F, condensation: the mixing liquid of the gas second alcohol and water behind the desorption sent into condensation is cooled to below 40 ℃ in the condensing surface.
G, gas-liquid separation: the cooled mixture of step F condensation is separated in gas-liquid separator, and the vaporium that the gas of separating is sent into step e mixes with water vapour, and water-soluble ethanol is then sent into the underground storage sealing and deposited.
H, rectifying: but the solution of depositing is sent into the ethanol that rectifying tower rectifying gets industrial application.
Embodiment 2:Like Fig. 1,2, shown in 3; Alcoholic acid method in a kind of recovery yew paper printing waste gas; Be with embodiment 1 difference: the dynamo-electric unit frequency of said steps A apoplexy is adjusted to 40 hertz; Filtration among the step B is the strainer that adopts following structure: the strainer two ends are fan housing 1 and back fan housing 2 before the doline, are communicated with by being positioned at intermediary rectangle two logical casings, and the inlet pipe of preceding fan housing 1 funnel osculum one side is provided with volume damper 3; A side of inlet pipe is equipped with detachable 100 purpose primary screens 5 in the casing, and waste gas is carried out primary filter; A side of escape pipe is equipped with detachable 140 purpose secondarys sieve 6 in the casing, waste gas is filtered once more, and lean on an end of escape pipe to be provided with primary condenser 7 at the secondary sieve, and the waste gas after filtering is cooled off, and its temperature is reduced to below 60 ℃; Leave certain space in the middle of the two-stage filtration sieve, and on the pairing rectangular box in this space, be provided with observation port 8, with convenient replacing screen cloth.
Step C, secondary table are cold: waste gas is not less than 70000 cubic metres vacuum fan suction through air quantity and is sent to and continues cooling in the secondary table cooler, and spent air temp is reduced to below 25 ℃.
Embodiment 3:Like Fig. 1,4, shown in 5; Alcoholic acid method in a kind of recovery yew paper printing waste gas; Be with embodiment 1 difference: the absorption among said step D, the E, desorption adopt horizontal adsorber to accomplish, and horizontal adsorber comprises that the integral body of horizontal placement is the absorption tank body 11 of cylinder type, and absorption tank body 11 middle and lower parts laterally are placed with filter 12; Activated carbon granule is positioned over and forms adsorption bed 13 on the filter 12; Be positioned at the vapour pipe 18 on absorption tank body 11 internal adsorption beds 13 tops, also comprise the exhaust inlet pipe 14 that is positioned at absorption tank body 11 1 ends, between exhaust inlet pipe 14 and the adsorption bed 13 gas baffle is set; And the vapor pipe 16 that is positioned at absorption tank body 11 tops, the vapour-liquid collection tube 17 of bottom, the top of absorption tank body 11 is provided with 2 charcoal-adding openings 20, and the middle and lower part of the two end cap of absorption tank body 11 is provided with clean-up port 21.
Embodiment 4:Shown in Fig. 1～5; Alcoholic acid method in a kind of recovery yew paper printing waste gas; Be with embodiment 2 differences: the absorption among said step D, the E, desorption adopt horizontal adsorber to accomplish; Horizontal adsorber comprises that the integral body of horizontal placement is the absorption tank body 11 of cylinder type, and absorption tank body 11 middle and lower parts laterally are placed with filter 12, and activated carbon granule is positioned over and forms adsorption bed 13 on the filter 12; Be positioned at the vapour pipe 18 on absorption tank body 11 internal adsorption beds 13 tops, on " U " type and its a plurality of equally distributed steam fumaroles 19 be set on the vapour pipe 18.Also comprise the exhaust inlet pipe 14 that is positioned at absorption tank body 11 1 ends, between exhaust inlet pipe 14 and the adsorption bed 13 gas baffle is set; And the vapor pipe 16 that is positioned at absorption tank body 11 tops, the vapour-liquid collection tube 17 of bottom, the top of absorption tank body 11 is provided with 2 charcoal-adding openings 20, and the middle and lower part of the two end cap of absorption tank body 11 is provided with clean-up port 21.
Claims (5)
1. one kind is reclaimed alcoholic acid method in the yew paper printing waste gas, it is characterized in that, may further comprise the steps:
A, collection waste gas: the different quantities print couple that starts during according to operation, start blower fan, the blower motor frequency is adjusted to the 30--40 hertz; The blower fan malleation is controlled at 1.5KPa; Keep certain negative pressure near the suction opening, utilize airstream suction and the gas power of floating, printing waste gas by sucking in the airtight relatively collection room; The formation inspiratory flow is sent out outdoor again along gas exhaust duct, change strainer over to and filter;
B, filtration, cooling: high-temp waste gas is delivered to strainer through airduct; Waste gas is filtered through 80～100 purpose primary filters sieve and 120～140 purpose cascade filtrations sieve; Remove wherein dust, granule foreign, through the water cooler cooling, its temperature is dropped to below 60～70 ℃ again;
C, secondary table are cold: waste gas is not less than 70000 cubic metres vacuum fan suction through air quantity and is sent to and continues cooling in the secondary table cooler, and spent air temp is reduced to below 25～35 ℃;
D, absorption: adopt three adsorber parallel waies that waste gas is adsorbed with gaseous diffuser; Cooled waste gas sends into that one of adsorber is back to be adsorbed by the activated carbon granule absorbent core; Ethanol molecule in the printing waste gas is adsorbed on the absorbent core; When adsorbate reaches preset value, stop absorption, waste gas changes two of adsorber over to and adsorbs;
E, desorption, regeneration of activated carbon: adopt the water vapor desorption to resolve, the water vapor that vaporium is produced is passed into one of saturated adsorber of ethanol molecule absorption ethanol molecule desorption from absorbent core is come out, and becomes the mixed solution of second alcohol and water; When two adsorbate of adsorber reaches preset value, two of adsorber is carried out desorption, at this moment; Adsorbed by three of adsorber, the warm air that feeds first of adsorber carries out drying to absorbent core, the steam off valve; Feed normal temperature air again, be cooled to about 25 ℃, make regeneration of activated carbon; The rest may be inferred, an adsorber absorption, a desorption, and another then carries out manipulation of regeneration to gac, can fully guarantee the normal operation of each adsorber;
F, condensation: the mixed solution of the second alcohol and water behind the desorption sent into condensation is cooled to below 40 ℃ in the condensing surface;
G, gas-liquid separation: the cooled mixture of step F condensation is separated in gas-liquid separator, and the vaporium that the gas of separating is sent into step e mixes with water vapour, and water-soluble ethanol is then sent into the underground storage sealing and deposited;
H, rectifying: but the solution of depositing is sent into the ethanol that rectifying tower rectifying gets industrial application.
2. alcoholic acid method in the recovery yew paper printing waste gas according to claim 1; It is characterized in that; Filtration among the said step B is the strainer that adopts following structure: the strainer two ends are fan housing (1) and back fan housing (2) before the doline, are communicated with by being positioned at intermediary rectangle two logical casings, and the inlet pipe of preceding fan housing (1) funnel osculum one side is provided with volume damper (3); A side of inlet pipe is equipped with detachable primary screen (5) in the casing, and waste gas is carried out primary filter; A side of escape pipe is equipped with detachable secondary sieve (6) in the casing, waste gas is filtered once more, and lean on an end of escape pipe to be provided with primary condenser (7) at the secondary sieve, and the waste gas after filtering is cooled off, and makes its temperature reduce to 60～70 ℃; Leave certain space in the middle of the two-stage filtration sieve, and on the pairing rectangular box in this space, be provided with observation port (8), with convenient replacing screen cloth.
3. alcoholic acid method in the recovery yew paper printing waste gas according to claim 2 is characterized in that, air quantity tensimeter (4) also is installed on the inlet pipe of strainer.
4. according to alcoholic acid method in each described recovery yew paper printing waste gas in the claim 1～3; It is characterized in that; Absorption among said step D, the E, desorption adopt horizontal adsorber to accomplish; Horizontal adsorber comprises that the integral body of horizontal placement is the absorption tank body (11) of cylinder type; Absorption tank body (11) middle and lower part laterally is placed with filter (12), and activated carbon granule is positioned over filter (12) and goes up formation adsorption bed (13), is positioned at the vapour pipe (18) on absorption tank body (11) internal adsorption bed (13) top; Also comprise the exhaust inlet pipe (14) that is positioned at absorption tank body (11) one ends, between exhaust inlet pipe (14) and the adsorption bed (13) gas baffle is set; And the vapor pipe (16) that is positioned at absorption tank body (11) top, the vapour-liquid collection tube (17) of bottom, the top of absorption tank body (11) is provided with 2 charcoal-adding openings (20), and the middle and lower part of the two end cap of absorption tank body (11) is provided with clean-up port (21).
5. alcoholic acid method in the recovery yew paper according to claim 4 printing waste gas is characterized in that, vapour pipe (18) is gone up on " U " type and its a plurality of equally distributed steam fumaroles (19) are set.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103521030A (en) * | 2013-09-29 | 2014-01-22 | 江苏中远环保科技有限公司 | Novel process and device for treating organic waste gas through adsorption method |
| CN104971618A (en) * | 2014-04-02 | 2015-10-14 | 德清天皓环保科技有限公司 | Communication gas shell with waste gas diffusion device |
| CN105315131A (en) * | 2014-06-18 | 2016-02-10 | 安徽省三环纸业(集团)有限公司 | Ethanol recycling system of tipping paper production line |
| CN106061926A (en) * | 2013-11-07 | 2016-10-26 | Eth苏黎世公司 | Cyclopropanation |
| CN110743276A (en) * | 2019-12-20 | 2020-02-04 | 山东万圣博化工有限公司 | Adhesive industrial waste gas treatment method |
| CN111023787A (en) * | 2018-10-09 | 2020-04-17 | 广东环葆嘉节能科技有限公司 | Hot air drying system |
| CN114484914A (en) * | 2022-01-26 | 2022-05-13 | 湖南依明机械科技有限公司 | Two-stage refrigeration liquefier and organic solvent recovery method and system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521030A (en) * | 2013-09-29 | 2014-01-22 | 江苏中远环保科技有限公司 | Novel process and device for treating organic waste gas through adsorption method |
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| CN106061926A (en) * | 2013-11-07 | 2016-10-26 | Eth苏黎世公司 | Cyclopropanation |
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| CN105315131A (en) * | 2014-06-18 | 2016-02-10 | 安徽省三环纸业(集团)有限公司 | Ethanol recycling system of tipping paper production line |
| CN111023787A (en) * | 2018-10-09 | 2020-04-17 | 广东环葆嘉节能科技有限公司 | Hot air drying system |
| CN111023787B (en) * | 2018-10-09 | 2023-08-25 | 广东环葆嘉节能科技有限公司 | Hot air drying system |
| CN110743276A (en) * | 2019-12-20 | 2020-02-04 | 山东万圣博化工有限公司 | Adhesive industrial waste gas treatment method |
| CN114484914A (en) * | 2022-01-26 | 2022-05-13 | 湖南依明机械科技有限公司 | Two-stage refrigeration liquefier and organic solvent recovery method and system |
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|---|---|
| CN102557868B (en) | 2014-04-23 |
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