CN102557868B - 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 clean of organic exhaust gas, be specially the circulation utilization method of organic exhaust gas.
Background technology
In the print production technique of cork paper, to use a large amount of organic solvents, these organic solvents are all volatilizations in the process of drying and forming-film, cause room air dirt, affect the healthy of direct labor, after indoor location vent fan, although can get rid of indoor exhaust air, but, after waste gas and air mixed, discharge, 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, to enterprise, brought heavy economical load, also caused the huge waste of resource simultaneously.
At present, to the recycling of organic solvent, generally have absorption process, condensation method and absorption method, absorption process essence is to transfer gaseous pollutant to liquid state, later separation difficulty.Condensation method is used both economical reasonable in the situation that organic solvent content is higher, and when solvent strength is rarer, subsequent recovery is just relatively difficult.Also have some enterprises to adopt absorption methods, be to printing waste gas collect, cooling, filtration, adsorption and desorption, condensation, gas-liquid separation obtain entering rectifying tower rectifying after organic solvent work in-process again, obtain can industrial application organic solvent.Application number is that 200910143780.4 Chinese invention patent discloses a kind of " method and apparatus that recovery contains water-soluble organic compounds waste gas ", cooling to carrying out after gas sampling, through activated carbon fiber Bag filter and columnar activated carbon strainer, filter again, cooling, gac or carbon fiber adsorption and catalytic combustion, steam desorption, condensation, gas-liquid separation obtains work in-process, then enters rectifying tower rectifying and obtain 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 activated carbon fiber cloth bag and the gac of use and changes inconvenience, and replacement cost is high.And it is lower that aforesaid method reclaims the ethanol work in-process relative concentration obtaining, and strengthened the difficulty of follow-up rectifying.
The Chinese invention patent that and for example application number is CN200710032540.8 discloses a kind of " from printing industry waste gas, method and the device of organic solvent reclaimed in absorption ", relate to method and the device of 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 by valve respectively, make press waste gas enter adsorber, two of one of adsorber and adsorber is also connected with one of condenser with pipeline by valve, one of condenser is connected with one of decanting vessel, one of decanting vessel joins with one of storage tank, one of storage tank is connected with three and extraction tower of adsorber with pipeline by valve respectively, extraction tower is also connected with one of three and decanting vessel of adsorber respectively.The method comprises adsorption process, desorption process, sepn process and water treatment procedure, organic exhaust gas containing toluene, acetone, Virahol adsorbs by active carbon adsorber, after charcoal absorption is saturated, be aided with water vapour and carry out desorption desorb, the mixed solution desorbing carries out oily water separation in decanting vessel.This invention needs to adopt spark arrester processing after 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, the invention provides a kind of organic efficiency high, simple to operate, the method of ethanol in the recovery printing waste gas that consumes energy few, the waste gas that application the method produces printing is recycled, organic solvent ethanol in can effective recycling waste gas, has reduced production cost, has solved the problem of pollution from exhaust emission environment.
The present invention is achieved through the following technical solutions: a kind of method that reclaims ethanol in cork paper printing waste gas, comprises the following steps:
A, collection waste gas: the different quantities print couple starting during according to operation, start blower fan, blower motor frequency is adjusted to 30--40 hertz, blower fan malleation is controlled at 1.5KPa, keep certain negative pressure near suction opening, utilize airstream suction and the gas power of floating, printing waste gas by sucking in relatively airtight collection room, formation inspiratory flow sends out outdoor again along gas exhaust duct, proceed to strainer and filter.
B, filtration, cooling: high-temp waste gas is delivered to strainer by airduct, waste gas is filtered through 80～100 object primary filter sieves and 120～140 object cascade filtrations sieve, remove wherein granule foreign, then through water cooler cooling, its temperature is dropped to below 60～70 ℃.
C, secondary table are cold: waste gas is not less than the vacuum fan suction of 70000 cubic metres by air quantity and is sent to and in secondary table cooler, continues coolingly, and spent air temperture is down to below 25～35 ℃.
D, absorption: adopt three adsorber parallel waies with gaseous diffuser to adsorb waste gas, cooled waste gas is adsorbed by activated carbon granule absorbent core after sending into one of adsorber, ethanol molecule in printing waste gas is adsorbed in absorbent core, when adsorbate reaches preset value, stop absorption, waste gas proceeds to two of adsorber and adsorbs.
E, desorption, regeneration of activated carbon: adopt water vapor desorption to resolve, the water vapor that vaporium is produced is passed into ethanol molecule and adsorbs one of saturated adsorber ethanol molecule desorption from absorbent core out, is become to the mixed solution of second alcohol and water; When two adsorbate of adsorber reaches preset value, carry out desorption to two of adsorber, now, by three of adsorber, adsorbed, the warm air that passes into first of adsorber is dried absorbent core, steam off valve, pass into again normal temperature air, be cooled to 25 ℃ of left and right, make regeneration of activated carbon; The rest may be inferred, an adsorber absorption, a desorption, and another 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 after desorption is sent in condenser below condensing cooling to 40 ℃.
G, gas-liquid separation: the mixture after step F condensing cooling is separated in gas-liquid separator, and the vaporium that the gas of separating is sent into step e mixes with water vapour, water-soluble ethanol is sent into underground storage sealing and is deposited.
H, rectifying: by the solution of depositing send into rectifying tower rectifying obtain can industrial application ethanol.
Filtration in described step B is the strainer that adopts following structure: strainer two ends are fan housing 1 and rear air cover 2 before doline, by the logical casing of rectangle two in the middle of being positioned at, be communicated with, the inlet pipe of front fan housing 1 funnel osculum one side is provided with volume damper 3 and has air quantity tensimeter 4, can regulate volume damper 3 according to the reading situation of air quantity tensimeter 4, to obtain suitable air output, in casing, a side of inlet pipe is provided with detachable primary screen 5, and waste gas is carried out to primary filter; A side of escape pipe is provided with detachable secondary sieve 6 in casing, waste gas is filtered again, and by one end of escape pipe, be provided with primary condenser 7 at secondary sieve, the waste gas after filtering is carried out cooling, makes its temperature be down to 60～70 ℃; In the middle of two-stage filtration sieve, leave certain space, and be provided with observation port 8 in the corresponding rectangular box in this space, to facilitate the replacing to screen cloth.
Adsorption and desorption in described step D, E adopts horizontal adsorber to complete, horizontal adsorber comprises the absorption tank body 11 that the entirety of horizontal placement is cylinder type, absorption tank body 11 middle and lower parts are laterally placed with filter 12, activated carbon granule is positioned over and on filter 12, forms adsorption bed 13, be positioned at the vapour pipe 18 on absorption tank body 11 internal adsorption bed 13 tops, vapour pipe 18 arranges multiple equally distributed steam fumarole 19 on " U " type and its.Also comprise the exhaust inlet pipe 14 that is positioned at absorption tank body 11 one end, between exhaust inlet pipe 14 and adsorption bed 13, gas baffle is set; And be positioned at the vapor pipe 16 that adsorbs tank body 11 tops, and the vapour-liquid collection tube 17 of bottom, the top of absorption tank body 11 arranges 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 process printing waste gas, not only improved the pollution that direct discharge causes, and under the condition of low cost, less energy-consumption, effectively reclaimed the ethanol in printing waste gas.
2. because the adsorber that adopts three groups of charcoal absorption core traverses in parallel carries out adsorption treatment to waste gas, recycling water vapor carries out desorption to saturated gac, regeneration of activated carbon processing, avoided gac poor at the adsorption effect in high temperature adsorption stage, the problem that Pollutant levels in exhaust exceed standard, technique is simple, easy to operate, and organic efficiency is high.
3. first gas spread before entering adsorber, makes the speed of the waste gas that enters charcoal absorption core more even, and total effective adsorption capacity of whole charcoal absorption core is improved.
4. before adsorbing, through twice condensation, increased organic efficiency after waste gas filtering.
5. strainer is comprised of two-stage sieve and condenser, has replaced Bag filter and activated carbon granule strumbox, and can directly in this filtration unit, to waste gas, carry out cooling afterwards in filtration, reduced the cost that several complete equipments are installed, filtering net can be changed every day, guarantees that air-flow is unimpeded, and efficiency is expensive low.
Accompanying drawing explanation
Fig. 1 is that the present invention prints waste gas circulation and utilizes schematic flow sheet.
Fig. 2 is strainer three-dimensional arrangement decomposing schematic representation of the present invention.
Fig. 3 is strainer three-dimensional arrangement combination schematic diagram of the present invention.
Fig. 4 is the horizontal adsorber three-dimensional arrangement of the present invention decomposing schematic representation.
Fig. 5 is the horizontal adsorber three-dimensional arrangement combination of the present invention schematic diagram.
In figure, front fan housing 1, rear air cover 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, a kind of method that reclaims ethanol in cork paper printing waste gas, comprises the following steps:
A, collection waste gas: the different quantities print couple starting during according to operation, start blower fan, blower motor frequency is adjusted to 30 hertz, blower fan malleation is controlled at 1.5KPa, keep certain negative pressure near suction opening, utilize airstream suction and the gas power of floating, printing waste gas by sucking in relatively airtight collection room, formation inspiratory flow sends out outdoor again along gas exhaust duct, proceed to strainer and filter.
B, filtration, cooling: by airduct, high-temp waste gas is delivered to strainer, waste gas is filtered through 80 object primary filter sieves and 120 object cascade filtrations sieve, remove granule foreign wherein, then through water cooler cooling, its temperature is dropped to below 70 ℃.
C, secondary table are cold: waste gas is not less than the vacuum fan suction of 70000 cubic metres by air quantity and is sent to and in secondary table cooler, continues coolingly, and spent air temperture is down to below 35 ℃.
D, absorption: adopt three adsorber parallel waies with gaseous diffuser to adsorb waste gas, cooled waste gas is adsorbed by activated carbon granule absorbent core after sending into one of adsorber, ethanol molecule in printing waste gas is adsorbed in absorbent core, when adsorbate reaches preset value, stop absorption, waste gas proceeds to two of adsorber and adsorbs.
E, desorption, regeneration of activated carbon: adopt water vapor desorption to resolve, the water vapor that vaporium is produced is passed into ethanol molecule and adsorbs one of saturated adsorber ethanol molecule desorption from absorbent core out, is become to the mixed solution of second alcohol and water; When two adsorbate of adsorber reaches preset value, carry out desorption to two of adsorber, now, by three of adsorber, adsorbed, the warm air that passes into first of adsorber is dried absorbent core, steam off valve, pass into again normal temperature air, be cooled to 25 ℃ of left and right, make regeneration of activated carbon; The rest may be inferred, an adsorber absorption, a desorption, and another 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 after desorption is sent in condenser below condensing cooling to 40 ℃.
G, gas-liquid separation: the mixture after step F condensing cooling is separated in gas-liquid separator, and the vaporium that the gas of separating is sent into step e mixes with water vapour, water-soluble ethanol is sent into underground storage sealing and is deposited.
H, rectifying: by the solution of depositing send into rectifying tower rectifying obtain can industrial application ethanol.
embodiment 2:as shown in Figure 1, 2, 3, a kind of method that reclaims ethanol in cork paper printing waste gas, difference from Example 1 is: the dynamo-electric unit frequency of described steps A apoplexy is adjusted to 40 hertz, filtration in step B is the strainer that adopts following structure: strainer two ends are fan housing 1 and rear air cover 2 before doline, by the logical casing of rectangle two in the middle of being positioned at, be communicated with, the inlet pipe of front fan housing 1 funnel osculum one side is provided with volume damper 3, in casing, a side of inlet pipe is provided with detachable 100 object primary screens 5, and waste gas is carried out to primary filter; A side of escape pipe is provided with detachable 140 object secondarys sieves 6 in casing, waste gas is filtered again, and by one end of escape pipe, be provided with primary condenser 7 at secondary sieve, the waste gas after filtering is carried out cooling, and its temperature is down to below 60 ℃; In the middle of two-stage filtration sieve, leave certain space, and be provided with observation port 8 in the corresponding rectangular box in this space, to facilitate the replacing to screen cloth.
Step C, secondary table are cold: waste gas is not less than the vacuum fan suction of 70000 cubic metres by air quantity and is sent to and in secondary table cooler, continues coolingly, and spent air temperture is down to below 25 ℃.
embodiment 3:as Fig. 1, 4, shown in 5, a kind of method that reclaims ethanol in cork paper printing waste gas, difference from Example 1 is: described step D, absorption in E, desorption adopts horizontal adsorber to complete, horizontal adsorber comprises the absorption tank body 11 that the entirety of horizontal placement is cylinder type, absorption tank body 11 middle and lower parts are laterally placed with filter 12, activated carbon granule is positioned over and on filter 12, forms adsorption bed 13, be positioned at the vapour pipe 18 on absorption tank body 11 internal adsorption bed 13 tops, also comprise the exhaust inlet pipe 14 that is positioned at absorption tank body 11 one end, between exhaust inlet pipe 14 and adsorption bed 13, gas baffle is set, and be positioned at the vapor pipe 16 that adsorbs tank body 11 tops, and the vapour-liquid collection tube 17 of bottom, the top of absorption tank body 11 arranges 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:as shown in Fig. 1～5, a kind of method that reclaims ethanol in cork paper printing waste gas, difference from Example 2 is: the adsorption and desorption in described step D, E adopts horizontal adsorber to complete, horizontal adsorber comprises the absorption tank body 11 that the entirety of horizontal placement is cylinder type, absorption tank body 11 middle and lower parts are laterally placed with filter 12, activated carbon granule is positioned over and on filter 12, forms adsorption bed 13, be positioned at the vapour pipe 18 on absorption tank body 11 internal adsorption bed 13 tops, vapour pipe 18 arranges multiple equally distributed steam fumarole 19 on " U " type and its.Also comprise the exhaust inlet pipe 14 that is positioned at absorption tank body 11 one end, between exhaust inlet pipe 14 and adsorption bed 13, gas baffle is set; And be positioned at the vapor pipe 16 that adsorbs tank body 11 tops, and the vapour-liquid collection tube 17 of bottom, the top of absorption tank body 11 arranges 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. a method that reclaims ethanol in cork paper printing waste gas, is characterized in that, comprises the following steps:
A, collection waste gas: the different quantities print couple starting during according to operation, start blower fan, blower motor frequency is adjusted to 30--40 hertz, blower fan malleation is controlled at 1.5KPa, keep certain negative pressure near suction opening, utilize airstream suction and the gas power of floating, printing waste gas by sucking in relatively airtight collection room, formation inspiratory flow sends out outdoor again along gas exhaust duct, proceed to strainer and filter;
B, filtration, cooling: high-temp waste gas is delivered to strainer by airduct, waste gas is filtered through 80～100 object primary filter sieves and 120～140 object cascade filtrations sieve, remove granule foreign wherein, then through water cooler cooling, its temperature is dropped to below 60～70 ℃;
C, secondary table are cold: waste gas is not less than the vacuum fan suction of 70000 cubic metres by air quantity and is sent to and in secondary table cooler, continues coolingly, and spent air temperture is down to below 25～35 ℃;
D, absorption: adopt three adsorber parallel waies with gaseous diffuser to adsorb waste gas, cooled waste gas is adsorbed by activated carbon granule absorbent core after sending into one of adsorber, ethanol molecule in printing waste gas is adsorbed in absorbent core, when adsorbate reaches preset value, stop absorption, waste gas proceeds to two of adsorber and adsorbs;
E, desorption, regeneration of activated carbon: adopt water vapor desorption to resolve, the water vapor that vaporium is produced is passed into ethanol molecule and adsorbs one of saturated adsorber ethanol molecule desorption from absorbent core out, is become to the mixed solution of second alcohol and water; When two adsorbate of adsorber reaches preset value, carry out desorption to two of adsorber, now, by three of adsorber, adsorbed, the warm air that passes into first of adsorber is dried absorbent core, steam off valve, pass into again normal temperature air, be cooled to 25 ℃ of left and right, make regeneration of activated carbon; The rest may be inferred, an adsorber absorption, a desorption, and another 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 after desorption is sent in condenser below condensing cooling to 40 ℃;
G, gas-liquid separation: the mixture after step F condensing cooling is separated in gas-liquid separator, and the vaporium that the gas of separating is sent into step e mixes with water vapour, water-soluble ethanol is sent into underground storage sealing and is deposited;
H, rectifying: by the solution of depositing send into rectifying tower rectifying obtain can industrial application ethanol.
2. the method for ethanol in recovery cork paper printing waste gas according to claim 1, it is characterized in that, filtration in described step B is the strainer that adopts following structure: strainer two ends are fan housing (1) and rear air cover (2) before doline, by the logical casing of rectangle two in the middle of being positioned at, be communicated with, the inlet pipe of front fan housing (1) funnel osculum one side is provided with volume damper (3), in casing, a side of inlet pipe is provided with detachable primary screen (5), and waste gas is carried out to primary filter; A side of escape pipe is provided with detachable secondary sieve (6) in casing, waste gas is filtered again, and by one end of escape pipe, be provided with primary condenser (7) at secondary sieve, the waste gas after filtering is carried out cooling, makes its temperature be down to 60～70 ℃; In the middle of two-stage filtration sieve, leave certain space, and in the corresponding rectangular box in this space, be provided with observation port (8), to facilitate the replacing to screen cloth.
3. the method for ethanol in recovery cork paper printing waste gas according to claim 2, is characterized in that, air quantity tensimeter (4) is also installed in the inlet pipe of strainer.
4. according to the method for ethanol in the recovery cork paper printing waste gas described in any one in claim 1～3, it is characterized in that, described step D, absorption in E, desorption adopts horizontal adsorber to complete, horizontal adsorber comprises the absorption tank body (11) that the entirety of horizontal placement is cylinder type, absorption tank body (11) middle and lower part is laterally placed with filter (12), activated carbon granule is positioned over the upper adsorption bed (13) that forms of filter (12), be 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 end, between exhaust inlet pipe (14) and adsorption bed (13), gas baffle is set, and be positioned at the vapor pipe (16) that adsorbs tank body (11) top, and the vapour-liquid collection tube (17) of bottom, the top of absorption tank body (11) arranges 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. the method for ethanol in recovery cork paper according to claim 4 printing waste gas, is characterized in that, vapour pipe (18) arranges multiple equally distributed steam fumaroles (19) on " U " type and its.
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| CN103521030B (en) * | 2013-09-29 | 2015-07-15 | 江苏中远环保科技有限公司 | Novel process and device for treating organic waste gas through adsorption method |
| GB201319677D0 (en) * | 2013-11-07 | 2013-12-25 | Eth Z Rich | Cyclopropanation |
| 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 |
| 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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