CN101342440B - Recovery method for organic waste gas of same-medium heat conduction plastic flexible package printing industry - Google Patents
Recovery method for organic waste gas of same-medium heat conduction plastic flexible package printing industry Download PDFInfo
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- CN101342440B CN101342440B CN2008101474847A CN200810147484A CN101342440B CN 101342440 B CN101342440 B CN 101342440B CN 2008101474847 A CN2008101474847 A CN 2008101474847A CN 200810147484 A CN200810147484 A CN 200810147484A CN 101342440 B CN101342440 B CN 101342440B
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Abstract
The invention relates to a recovery method for organic exhaust gas. The invention discloses the recovery method for the organic exhaust gas in a same medium heat conducting plastic flexible package in printing industry; after the organic exhaust gas is compressed by a high-pressure positive blower, the impurity of the organic exhaust gas is filtered out by a filter unit; the exhaust gas is cooledby a surface cooler to a temperature which is suitable for adsorbing and passes though a wind-collecting distributor into an adsorber for adsorbing. When the exhaust gas reaches a discharge standard for environmental protection, the adsorber switches to same medium heating conducting desorption; the desorbed gas enters into a recovery tower for condensing and recovering. The invention solves the problems that the water content in solvent in the prior steam desorbing recovery is out of the standard; and the solvent cannot be used for reproduction directly; the invention also avoids the problems that ethyl ester is decomposed by water into alcohol and acetic acid to reduce the purity and the quality of the recovered solvent and resolves the problems that the alcohol solvent is mixed and dissolved in the water and cannot be recovered directly; meanwhile the invention also resolves the problems of the high price and the short service life of equipment and material due to acid corrosion.
Description
Technical field
The present invention relates to a kind of method for organic waste gas recovery, particularly a kind of organic waste gas of same-medium heat conduction plastic flexible package printing industry recovery method.
Background technology
At present in the plastic flexible package printing industry method for organic waste gas recovery, all adopt suitable sorbing material in absorber, to adsorb under the normal temperature, adsorb saturated back and add the steam heated desorption, the mist that desorption gas and steam are formed is through condensation liquefaction, finish separating of solvent and water by the gravitational settling separator, reclaim organic solvent.Required temperature environment when this method directly provides desorption because of adopting steam as heat energy carrier, having problems aspect following 6: 1 part organic solvent and water can decomposite acid after mixing, and the equipment that is in contact with it is produced strong corrosiveness shorten equipment life; Steam condensate (SC) after 2 separation is because of containing organic substance, and its content exceeds discharging standards and can not directly discharge, and causes secondary pollution; 3 partial solvents such as ethyl ester, butanone water saturation value are very high, cause the Moisture high UCL that reclaims solvent, can't directly use; 4 partial solvents can't directly reclaim use owing to mix water-soluble; 5 cause the rate of recovery to descend owing to the employed solvent major part of printing industry has water-soluble characteristic; 6 sorbing material NACFs corrode through water vapor condensation in desorption process repeatedly, cause charcoal fiber micropore surface by incrustation scale calcification, reduction of service life.The multiple method for organic waste gas recovery of same-medium heat conduction disclosed by the invention is the solution at above 6 aspect problem inventions.
Summary of the invention
For remedying above-mentioned deficiency, the purpose of this invention is to provide a kind of recovered solvent and do not decompose, never degenerate, the purity height can be directly used in and produce, to the free from corrosion organic waste gas of same-medium heat conduction plastic flexible package printing industry recovery method of reclaimer.
In order to achieve the above object, the present invention has following technical scheme:
A kind of method that adopts same-medium heat conduction that the plastic flexible package printing industry organic exhaust gas is reclaimed of the present invention, after the steps include: that organic exhaust gas is by the high pressure positive blower pressurization, install impurity in the filtering exhaust after filtration, enter collection wind distributor after surface cooler is with the waste gas cooling, cooling waste gas is distributed to each absorber in the recovery system by collection wind distributor; Enter absorber absorption organic exhaust gas, when emission gases detects when reaching the environmental emission standard setting value through the voc gas sensor, absorber changes the same-medium heat conduction desorption process of heating over to; It is characterized in that: the present invention adopts the same medium evaporimeter to absorber to spray into same dielectric solvent, evaporate on high temperature evaporation face with dielectric solvent with the medium evaporimeter, boil-off gas carries heat energy and passes through adsorption layer, the steam of absorber housing outer wall interlayer feeding is simultaneously heated, the inwall of absorber produces the same dielectric gas of cooling that radiant heat heating adsorption layer flows out, and finishes desorption so that rapidly the adsorption layer temperature is brought up to desorption temperature; Gas enters the condensation recovery tower through the level pressure drain valve behind the desorption, and condensation recovery tower recovered solvent flows into solvent tank; After desorption is finished, air enters absorber after being heated up by blower fan pressurization heater via, high concentration voc (volatile organic compound) gas in the absorber is entered the condensation of condensation recovery tower to be reclaimed, transferring normal temperature wind after the emptying to is the adsorption layer cooling, the cooling wind that has a small amount of voc gas is sent into collection wind distributor, is adsorbed again by another absorber that is operated in adsorbed state; Enter next working cycles after the absorber cooling.
Wherein, described employing also comprises with the step of medium evaporimeter: adopt the medium evaporimeter to produce with the medium high-temperature gas, provide the absorber desorption process required heat energy with the medium high-temperature gas as heat energy carrier.
Wherein, the tank skin of described absorber adopts double-decker, when absorber carries out desorption, feeds steam in the absorber tank skin interlayer and heats, and the desorption environment is provided.
Wherein, describedly be installed on the absorber, or be installed in outside the absorber with the medium evaporimeter.
Wherein, describedly provide heat energy by steam or thermal conductance oil, the same dielectric solvent heat air of injecting is changed into high-temperature gas with the medium evaporimeter.
Wherein, described blower fan and heater are formed high-pressure hot wind loop and normal temperature wind loop, and this loop is used to finish the discharge desorption gas of desorption ending phase or reduces the sorbing material temperature.
Wherein, the sorbing material of described absorber employing is a NACF.
Owing to taked above technical scheme, the invention has the advantages that:
The present invention has solved the interior moisture of existing steam desorption recovered solvent effectively and has exceeded standard, and can't be directly used in production; For example avoid ethyl ester to meet water and resolved into ethanol and acetate, caused the purity, the quality that reclaim solvent to descend; Efficiently solve alcohols solvent such as isopropyl alcohol, ethanol, butanols, the ester class is mixed water-soluble and a difficult problem that can't directly reclaim; Resolve into acid after partial organic substances is met water when also having solved simultaneously the recovery of steam desorption, because of the equipment and materials price height that acid corrosion causes, the short problem of working life.
Description of drawings
Fig. 1 is the operation principle block diagram of method of the present invention.
Among the figure, 1, high pressure positive blower, 2, filter, 3, surface cooler, 4, collection wind distributor, 5, absorber, 6, the condensation recovery tower, 7, solvent tank, 8, gas detects, 9, heater, 10, with the medium evaporimeter, 11, blower fan, 12, cooling tower.
The specific embodiment
Following examples are used to illustrate the present invention, but are not used for limiting protection scope of the present invention.
Referring to Fig. 1: a kind of same-medium heat conduction that adopts disclosed by the invention is implemented as follows to the method that the plastic flexible package printing industry organic exhaust gas reclaims:
1, organic exhaust gas enters high pressure positive blower 1 by air supply duct, under the effect of high pressure positive blower 1 organic exhaust gas through filter 2 with gas in contaminant filter to improve the working life of sorbing material, the organic exhaust gas that is cooled to suitable adsorption temp through surface cooler 3 enters collection wind distributor 4, waste gas through cooling is distributed to many absorbers 5 in the recovery system by collection wind distributor 4, and many absorbers 5 are formed the gas recovery system of continuous operation.
2, cooling waste gas enters absorber 5, through the absorbent core absorption of absorber 5.When the emission gases after the absorption sets value near environmental emission standard, the saturated same-medium heat conduction desorption process that changes over to of absorbent core absorption.Same-medium heat conduction is that the organic solvent that will reclaim is given adsorbing medium by the organic solvent gas thermal energy conduction that HCS or thermal conductance oil indirect produce, and promotes the adsorbing medium temperature, reaches the purpose that desorption reclaims.The method can be avoided secondary pollution effectively, can guarantee that recovered solvent can be directly used in production.The present invention has solved the interior moisture of existing steam desorption recovered solvent effectively and has exceeded standard, and can't be directly used in production; For example avoid ethyl ester to meet water and resolved into ethanol and acetate, caused the purity, the quality that reclaim solvent to descend; Efficiently solve alcohols solvent such as isopropyl alcohol, ethanol, butanols, the ester class is mixed water-soluble and a difficult problem that can't directly reclaim; Resolve into acid after partial organic substances is met water when also having solved simultaneously the recovery of steam desorption, because of the equipment and materials price height that acid corrosion causes, the short problem of working life.
3, absorber 5 is at needed functional part of desorption stage:
3.1 with medium evaporimeter 10: with feeding steam (or thermal conductance oil) in the medium evaporimeter 10, to inject with 10 evaporations of medium evaporimeter with dielectric solvent, evaporate on high temperature evaporation face with dielectric solvent with medium evaporimeter 10, boil-off gas carries heat energy by adsorption layer, the adsorption layer temperature is brought up to desorption temperature finish desorption.So-called same dielectric gas, be meant the mixed organic solvents of voc gas after reclaiming of production process discharging, high-temperature gas through producing with the medium evaporator evaporation, provide absorber 5 desorption processes required heat energy as heat energy carrier, this technology institute recovered solvent can be directly used in and produce, and realizes recycling.
3.2 the double-deck tank skin of absorber 5: the tank skin interlayer feeds steam and heats when desorption, and the inwall of absorber 5 produces the same dielectric gas of cooling that radiant heat heating adsorption layer flows out, and realizes desorption so that rapidly the adsorption layer temperature is brought up to desorption temperature.
3.3 high-pressure hot wind, the normal temperature wind loop be made up of blower fan 11 and heater 9: after desorption was finished, air entered absorber 5 after being heated up by blower fan 11 pressurization heater vias 9, high concentration voc gases in the absorber 5 is entered 6 condensations of condensation recovery tower reclaim.After the emptying of high concentration voc gas, heater 9 stops to heat, and to transfer normal temperature wind to be adsorption layer cooling, and the tank skin of the bilayer of absorber 5 heating simultaneously stops heating, and absorber 5 begins cooling.After absorber 5 coolings are finished, enter next working cycles.
3.4 each related valve and blower fan 11 workshation state tables in absorber 5 working cycles
| By-pass valve control and blower fan | Adsorption process | Desorption process is changeed in absorption | Desorption process | Desorption changes adsorption process | Temperature-fall period | Adsorption process |
| The organic exhaust gas air intake valve of absorber 5 | - | X | X | X | X | - |
| The tank skin of absorber 5 steam valve of heating | X | - | - | X | | X |
| Absorber | ||||||
| 5 desorption gas are to condensation recovery tower 6 valves | X | X | -/X | X | X | X |
| The steam valve of heating of heater 9 | X | X | X | - | X | X |
| With the steam of medium evaporimeter 10 valve of heating | X | - | - | X | X | X |
| Same dielectric solvent valve with medium evaporimeter 10 | X | - | -/X | X | X | X |
| Blower fan 11 | X | X | X | - | - | X |
To annotate :-expression opens X and represents to close-/X represents to carry out switch control by control system according to pressure, the temperature operating mode of absorber 5
4, produce during absorber 5 desorptions desorption gas enter condensation recovery tower 6 condensation liquefactions, solvent flows into solvent tank 7, finishes the organic exhaust gas removal process.
5, recyclable plastics flexible package printing industry solvent waste gas table of the present invention
| Alkanes | Ethane, heptane |
| Ketone | Acetone, butanone, cyclohexanone, 4-methyl-2 pentanone |
| Alcohols | Ethanol, butanols, isopropyl alcohol, diacetone alcohol, n-butanol |
| The benzene class | Toluene, dimethylbenzene |
| The ester class | Ethyl acetate, butyl acetate, n-propyl acetate |
Technical process of the present invention is controlled by the analyzing and processing of detection data such as pressure, temperature, organic gas content level sensor is finished overall process automatically by PLC (programmable logic controller (PLC)) or DCS (Distributed Control System).
Claims (7)
1. method that adopts same-medium heat conduction that the plastic flexible package printing industry organic exhaust gas is reclaimed, after the steps include: that organic exhaust gas is by the high pressure positive blower pressurization, install impurity in the filtering exhaust after filtration, enter collection wind distributor after surface cooler is with the waste gas cooling, cooling waste gas is distributed to each absorber in the recovery system by collection wind distributor; Enter absorber absorption organic exhaust gas, when emission gases detects when reaching the environmental emission standard setting value through the voc gas sensor, absorber changes the same-medium heat conduction desorption process of heating over to, described same-medium heat conduction is that the organic solvent that will reclaim is given adsorbing medium by the organic solvent gas thermal energy conduction that HCS or thermal conductance oil indirect produce, promote the adsorbing medium temperature, it is characterized in that: adopt same medium evaporimeter to spray into same dielectric solvent to absorber, evaporate on high temperature evaporation face with dielectric solvent with the medium evaporimeter, boil-off gas carries heat energy and passes through adsorption layer, the steam of absorber housing outer wall interlayer feeding is simultaneously heated, the inwall of absorber produces the same dielectric gas of cooling that radiant heat heating adsorption layer flows out, finish desorption so that rapidly the adsorption layer temperature is brought up to desorption temperature, described same dielectric gas, be meant the mixed organic solvents of voc gas after reclaiming of production process discharging, high-temperature gas through producing with the medium evaporator evaporation; Desorption gas enters the condensation recovery tower through level pressure or constant temperature drain valve, and condensation recovery tower recovered solvent flows into solvent tank; After desorption is finished, air enters absorber after being heated up by blower fan pressurization heater via, high concentration voc gas in the absorber is entered the condensation of condensation recovery tower to be reclaimed, transferring normal temperature wind after the emptying to is the adsorption layer cooling, the cooling wind that has a small amount of voc gas is sent into collection wind distributor, is adsorbed again by another absorber that is operated in adsorbed state; Enter next working cycles after the absorber cooling.
2. a kind of method that adopts same-medium heat conduction that the plastic flexible package printing industry organic exhaust gas is reclaimed as claimed in claim 1, it is characterized in that described employing also comprises with the step of medium evaporimeter: adopt with the medium evaporimeter to produce, provide the absorber desorption process required heat energy as heat energy carrier with the medium high-temperature gas with the medium high-temperature gas.
3. a kind of method that adopts same-medium heat conduction that the plastic flexible package printing industry organic exhaust gas is reclaimed as claimed in claim 1, it is characterized in that: the tank skin of described absorber adopts double-decker, when absorber carries out desorption, feed steam in the absorber tank skin interlayer and heat, the desorption environment is provided.
4. a kind of same-medium heat conduction that adopts as claimed in claim 1 is characterized in that the method that the plastic flexible package printing industry organic exhaust gas reclaims: describedly be installed on the absorber with the medium evaporimeter, or be installed in outside the absorber.
5. a kind of method that adopts same-medium heat conduction that the plastic flexible package printing industry organic exhaust gas is reclaimed as claimed in claim 1, it is characterized in that: describedly provide heat energy by steam or thermal conductance oil, the same dielectric solvent heat air of injecting is changed into high-temperature gas with the medium evaporimeter.
6. a kind of method that adopts same-medium heat conduction that the plastic flexible package printing industry organic exhaust gas is reclaimed as claimed in claim 1, it is characterized in that: described blower fan and heater are formed high-pressure hot wind loop and normal temperature wind loop, and this loop is used to finish the discharge desorption gas of desorption ending phase or reduces the sorbing material temperature.
As claim 1 or 6 described a kind of same-medium heat conductions that adopt to the method that the plastic flexible package printing industry organic exhaust gas reclaims, it is characterized in that: the sorbing material that described absorber adopts is a NACF.
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| CN2008101474847A CN101342440B (en) | 2008-08-20 | 2008-08-20 | Recovery method for organic waste gas of same-medium heat conduction plastic flexible package printing industry |
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| CN101342440B true CN101342440B (en) | 2010-11-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101637686B (en) * | 2009-09-07 | 2011-10-12 | 孙宗长 | Method for organic waste gas recovery by adopting secondary adsorption |
| CN103091416B (en) * | 2012-12-29 | 2014-07-30 | 聚光科技(杭州)股份有限公司 | Gas analyzing system and working method thereof |
| CN104436988A (en) * | 2013-09-13 | 2015-03-25 | 中国科学院兰州化学物理研究所 | Industrial organic waste gas treatment and cleaning process |
| CN103521031A (en) * | 2013-10-28 | 2014-01-22 | 洛阳天宝环保科技有限公司 | Low concentration organic waste gas concentrating device and method |
| CN103657327B (en) * | 2013-12-05 | 2015-06-17 | 山东建筑大学 | Triethylamine cold-box core making tail gas treatment and amine recovery method, and apparatus thereof |
| CN103977670B (en) * | 2014-05-31 | 2017-05-24 | 李玉彪 | Device for recycling waste gas containing volatile organic compounds |
| CN105080175A (en) * | 2015-08-28 | 2015-11-25 | 赵智民 | Exhaust-emission-free online printing solvent recovery device |
| CN108905395A (en) * | 2018-07-18 | 2018-11-30 | 濉溪县杰森环保科技有限公司 | A kind of VOCs exhaust gas concentration detection method |
| CN110860155A (en) * | 2018-08-27 | 2020-03-06 | 江苏中远环保科技有限公司 | Circulating oil-gas separation device |
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- 2008-08-20 CN CN2008101474847A patent/CN101342440B/en active Active
Non-Patent Citations (2)
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| 李婕 等.挥发性有机物（VOCS）活性炭吸附回收技术综述.《四川环境》.2007,第26卷(第6期),101-105. |
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