CN105327591A - Organic exhaust-gas processing method - Google Patents
Organic exhaust-gas processing method Download PDFInfo
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- CN105327591A CN105327591A CN201410401675.7A CN201410401675A CN105327591A CN 105327591 A CN105327591 A CN 105327591A CN 201410401675 A CN201410401675 A CN 201410401675A CN 105327591 A CN105327591 A CN 105327591A
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Abstract
The invention relates to an organic volatile gas recovery technology and an apparatus thereof. The recovery technology comprises the following operation flow: 1) introducing volatile gas into an absorbing tower for being absorbed; 2) performing cyclic absorption on an absorption solution; 3) desorbing the absorption solution; 4) cooling the desorbed gas; 5) performing recycle recovery utilization on the absorption solution; and 6) finally, processing gas in an adsorption tank and then discharging the gas. The processing method is suitable for gas with high concentration, large flow and large concentration fluctuation such as mercaptan, thioether, organic acidity, phenol, methylphenol, amine, acetaldehyde, alcohol, hydrocarbons and acetone, or occasion of polymerizable organic compounds.
Description
Technical field
The present invention relates to a kind of volatile organic compounds and absorb processing method, a kind of absorption process and absorption method organically combine technique and the device of process volatile organic compounds specifically.
Background technology
A large amount of organic solvents generally all will be used, as the aromatic solvents such as benzene,toluene,xylene and ethanol, isopropyl alcohol, ethyl acetate, butyl acetate, butanone, dichloroethanes, chloroethanes, hydro carbons etc. in industries such as chemical industry, petrochemical industry, medicine, weaving, coating, degreasing, food, agricultural chemicals.These organic solvents are low boiling, volatile organic compound mainly, have certain toxicity, and wherein quite a few finally enters air with the form of organic exhaust gas, causes severe contamination to surrounding environment.Therefore, under the background that, country severe at current Environmental Protection Situation strengthens year by year to Environmental Inputs dynamics, the organic component in emission is reclaimed/destroy the pollution that can either reduce environment by rationally suitable method, the recycling of resource can be realized again, there is very strong economic worth and environment protection significance.
At present, VOCs treatment technology is mainly divided into absorption method and destruction method.Recovery technology mainly comprises absorption process, absorption method, condensation method, embrane method etc.; Recovery technology, mainly by organic gas and low-molecular-weight air separation, while realizing purification of air, can realize recycling of resource, reach good economic benefit.And destroy technology mainly comprises burning method, Production by Catalytic Combustion Process, photocatalytic method, low temperature plasma method and bioanalysis etc.; Destroy technology is that the organic component in tail gas is converted into the low molecular weight substances such as CO2, H2O, realizes the harmless discharge of tail gas.
Because destroy technology is by the small molecular weight material of the resource substance convert low value of some high use value, this is a kind of huge waste to the higher recycling VOCs gas of some purity, and high equipment investment simultaneously also causes very large equipment investment and the burden of operating cost to enterprise; Although and recovery technology can realize the recycling of VOCs on the other hand, the qualified discharge of tail gas needs high equipment investment, makes investment return ratio not realize optimization.Therefore, different technology or complex technique is reasonably selected can to realize the optimization of environment, economic benefit.
According to practical work experience, based on the consideration of environmental protection and maximization of economic benefit, we have developed a kind of complex technique utilizing absorption and desorption technical finesse VOCs gas, this technology can be used for the high and recovery of fluctuating VOCs gas large of concentration of emission and harmless to environment process, realizes the optimization of economic benefit and environmental benefit.
Summary of the invention
The present invention mainly for the problems referred to above that existing organic gas treatment technology exists, provides technique and the device of a kind of VOCs GAS ABSORPTION and desorb.This technique adopts a whole set for the treatment of facility such as absorption tower, desorber, is recycled by a large amount of organic gas; On absorption tower, outlet carries out absorption after-treatment to vent gas simultaneously, realizes terminal drainage environment protection standard.
Technical solutions according to the invention are realized by two modules: absorption module and desorb module.
Technical matters of the present invention is achieved in that it comprises the following steps:
Organic volatile gas enters absorption tower from absorber tower cylinder bottom and carries out Gas-Liquid Absorption; First absorbent sprays in the middle part of tower, and then pure absorbent sprays from tower top, and be counter current contacting with gas, purified gas is discharged from tower top.
Absorbing liquid (absorbent+absorbent) part out at the bottom of tower is first delivered to after heat exchanger cooling through circulating pump and is sprayed in the middle part of tower; Another part absorbing liquid is sent to desorber and carries out desorb, absorbing liquid is first preheated to uniform temperature through autoclave heat exchanger, the desorb of input Analytic Tower, gas condensation after supercooling that tower top rises enters return tank, is continued to be circulated in absorption tower carry out waste gas absorption by return tank drain waste gas out; Part liquid phase is back to tower top through reflux pump, and a part of Product recycling utilizes;
Absorber tower cylinder top is sent to through subcooler cooling from autoclave exchanger base absorbent out.
Absorb incomplete waste gas in absorption tower, entered in adsorption tanks by blower fan air inducing and carry out processing rear qualified discharge.
The exhausted air quantity that above-mentioned absorption tower and desorber can process as required adjusts, the operating mode processing requirements that increasing device specification or increase number of devices are satisfied the demand.
Volatile organic compounds in technique of the present invention is mercaptan, thioether, organic acid, phenol, cresols, amine, acetaldehyde, alcohol, hydro carbons, acetone etc.
Apparatus of the present invention by absorption tower, cooler, desorber, pump, adsorption tanks, the equipment such as return tank are connected by pipeline, by series and parallel connections pattern, realize classification absorption and the desorb of technique and recycle function, under classification disposition, progressively waste gas is absorbed, absorbent solution desorb, stripping workshop condensation, realizes the qualified discharge of waste gas and the partially recycled utilization of waste gas; Under loop condition, by the condensation of different units node, by different content, the organic solution of variable concentrations is recycled, repeat absorption and desorption process, improve the effective rate of utilization of absorbent solution and the rate of recovery of waste gas, to make present invention process efficient more economically.
The requirement of the present invention to absorbent is: have larger solubility, and has higher selective to absorbent; Vapour pressure is low as much as possible, avoids causing secondary pollution; Absorbent is easy to use, and regeneration, again to utilize; There is good heat endurance and chemical stability; Ability hydrolysis, not oxidizable; Ignition temperature is high; Toxicity is low, not etching apparatus; Easy acquisition, economical cheap.
Tool of the present invention has the following advantages: can be used for the occasion that exhaust gas concentration is high; Lyosoption easily obtains; Exhaust gas flow can be adapted to, the fluctuation of concentration; Polymerisable organic compound can be absorbed; Not easily catch fire, do not need special safety measure; Employing Automatic Control is easy to operate, and is realized on the spot and Long-distance Control by control system processed.
Accompanying drawing explanation
Fig. 1 is the process chart of this contrive equipment
Comprise absorption tower 1, blower fan 2, adsorption tanks 3, cooler 4, circulating pump 5, feed pump 6, cooler 7, autoclave heat exchanger 8, desorber 9, condenser 10, return tank 11, reflux pump 12.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be further described, and embodiment is not as the restricted explanation of file of the present invention.
Before passing into waste gas, feed pump 6 is opened and is added suitable absorbent solution to absorption tower 1, and when absorbent solution covers waste gas charging aperture and meets the requirements, regulate the absorbent flow entered to required size, meeting sprinkle density is 10.4m
3/ (m
2.h).Waste gas enters absorption tower through pipe influx, portion is absorbed by bottom solution in tower, because of waste gas and absorbing liquid contact area little, time of contact section, large quantity of exhaust gas is gone out absorbing liquid and is continued upwards, and waste gas upwards contacts at filling surface with the absorbent solution under pouring, is fully absorbed by absorbent solution, last a small amount of unabsorbed gases is evacuated to adsorption tanks through the effect of blower fan 2, and final gas enters air by top.
Absorbent solution absorbs after waste gas, and be recycled pump 5 by absorption tower bottom discharge outlet and be evacuated to heat exchanger and cool, cooled absorbing liquid continues to pass into absorption tower 1 cyclic absorption.After absorbing liquid is circulated to finite concentration, open the valve passing into desorber, liquid will be partially absorbed and pass into autoclave heat exchanger 8.Mixed liquor is heated in autoclave heat exchanger, desorb is carried out by heat exchanger top desorber 9, gas after desorb enters condenser 10 by tower top and carries out condensation, and condensate liquid to enter after return tank again according to chemical unit needs, flows into each chemical unit use as raw material by reflux pump.The solution that in autoclave heat exchanger 8, non-desorption part or desorb are left passes in cooler 7 and cools, and is squeezed in absorption tower 1 reuse after cooling by feed pump 6.
This patent adds EGR in the process of absorption and desorption, makes full use of absorbing liquid, and is reused by regeneration, under the condition meeting emission request and recycling, reduce process operation cost.
Claims (7)
1. volatile organic compounds recovery process and a device, recovery process realizes according to following operating process:
(1) organic volatile gas enters absorption tower from absorber tower cylinder bottom and carries out Gas-Liquid Absorption; First absorbent sprays in the middle part of tower, and then pure absorbent sprays from tower top, and be counter current contacting with gas, purified gas is discharged from tower top.
(2) absorbing liquid (absorbent+absorbent) part out at the bottom of tower is first delivered to after heat exchanger cooling through circulating pump and is sprayed in the middle part of tower; Another part absorbing liquid is sent to desorber and carries out desorb, absorbing liquid is first preheated to uniform temperature through autoclave heat exchanger, the desorb of input desorber, gas condensation after supercooling that tower top rises enters return tank, is continued to be circulated in absorption tower carry out waste gas absorption by return tank drain waste gas out; Part liquid phase is back to tower top through reflux pump, and a part of Product recycling utilizes;
(3) absorber tower cylinder top is sent to from autoclave exchanger base absorbent out through subcooler cooling.
(4) absorb incomplete waste gas in absorption tower, entered in adsorption tanks by blower fan air inducing and carry out processing rear qualified discharge.
2. the organic gas recovery device according to claims 1, is characterized in that, described device is combined by absorption tower, adsorption tanks, cooler, autoclave heat exchanger, desorber, return tank, pump.
3. the organic gas recovery device according to claims 1, is characterized in that, discharges absorbing liquid and have to pass through the use of cooler cooling Posterior circle bottom described absorption tower.
4. the organic gas recovery device according to claims 1, is characterized in that, described autoclave heat exchanger and desorber are upper and lower integral type heating desorption equipment.
5. the organic gas recovery device according to claims 1, it is characterized in that, the gas after described desorber desorb must enter the cooler of connection, and after cooling, condensation enters return tank, part liquid phase is back to tower top through reflux pump, and a part of Product recycling utilizes.
6. the organic gas recovery device according to claims 1, is characterized in that, described absorption tower top gas finally enters adsorption tanks process, qualified discharge after process.
7. the volatile organic compounds processing method according to claims 1, is characterized in that, wherein said volatile organic compounds is mercaptan, thioether, organic acid, phenol, cresols, amine, acetaldehyde, alcohol, hydro carbons, acetone etc.
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| CN201410401675.7A CN105327591A (en) | 2014-08-15 | 2014-08-15 | Organic exhaust-gas processing method |
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| CN201410401675.7A CN105327591A (en) | 2014-08-15 | 2014-08-15 | Organic exhaust-gas processing method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105854510A (en) * | 2016-05-13 | 2016-08-17 | 郭晓光 | Treatment equipment and method for VOCs |
| CN107198913A (en) * | 2016-03-18 | 2017-09-26 | 中国石油化工股份有限公司 | Decahydronaphthalene washes recovery process in waste gas |
| CN107303456A (en) * | 2016-04-21 | 2017-10-31 | 李润超 | A kind of device of Collecting and dealing uncontrollable discharge gas |
| CN108786386A (en) * | 2018-08-02 | 2018-11-13 | 无锡菲兰爱尔空气质量技术有限公司 | A kind of laboratory exhaust gas processing system and its processing method |
| CN109012037A (en) * | 2018-08-08 | 2018-12-18 | 东华工程科技股份有限公司 | A kind of purification separation system of polyphenylene oxide polymerization tail gas |
| CN109806713A (en) * | 2019-01-22 | 2019-05-28 | 河北泰帆环保工程有限公司 | A kind of toluene waste gas processing method |
| CN110354644A (en) * | 2018-04-10 | 2019-10-22 | 天津科技大学 | A kind of efficient butyl acetate waste gas absorption and desorption apparatus |
| CN114425220A (en) * | 2020-10-15 | 2022-05-03 | 中国石油化工股份有限公司 | Tetrahydrofuran-containing tail gas treatment method, system and application |
| CN114425223A (en) * | 2020-10-15 | 2022-05-03 | 中国石油化工股份有限公司 | Tetrahydrofuran tail gas recovery system, method and application |
| CN115138185A (en) * | 2022-07-30 | 2022-10-04 | 武汉凯比思电力设备有限公司 | Device and method for treating and recycling waste gas in epichlorohydrin production process |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107198913A (en) * | 2016-03-18 | 2017-09-26 | 中国石油化工股份有限公司 | Decahydronaphthalene washes recovery process in waste gas |
| CN107303456A (en) * | 2016-04-21 | 2017-10-31 | 李润超 | A kind of device of Collecting and dealing uncontrollable discharge gas |
| CN105854510A (en) * | 2016-05-13 | 2016-08-17 | 郭晓光 | Treatment equipment and method for VOCs |
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| CN110354644A (en) * | 2018-04-10 | 2019-10-22 | 天津科技大学 | A kind of efficient butyl acetate waste gas absorption and desorption apparatus |
| CN108786386A (en) * | 2018-08-02 | 2018-11-13 | 无锡菲兰爱尔空气质量技术有限公司 | A kind of laboratory exhaust gas processing system and its processing method |
| CN108786386B (en) * | 2018-08-02 | 2023-11-10 | 无锡菲兰爱尔空气质量技术有限公司 | Laboratory waste gas treatment system and treatment method thereof |
| CN109012037A (en) * | 2018-08-08 | 2018-12-18 | 东华工程科技股份有限公司 | A kind of purification separation system of polyphenylene oxide polymerization tail gas |
| CN109806713A (en) * | 2019-01-22 | 2019-05-28 | 河北泰帆环保工程有限公司 | A kind of toluene waste gas processing method |
| CN114425220A (en) * | 2020-10-15 | 2022-05-03 | 中国石油化工股份有限公司 | Tetrahydrofuran-containing tail gas treatment method, system and application |
| CN114425223A (en) * | 2020-10-15 | 2022-05-03 | 中国石油化工股份有限公司 | Tetrahydrofuran tail gas recovery system, method and application |
| CN115138185A (en) * | 2022-07-30 | 2022-10-04 | 武汉凯比思电力设备有限公司 | Device and method for treating and recycling waste gas in epichlorohydrin production process |
| CN115138185B (en) * | 2022-07-30 | 2023-12-05 | 武汉凯比思电力设备有限公司 | Device and method for treating and recycling waste gas in epichlorohydrin production process |
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