CN201807279U - High-efficiency flue gas dust-removal desulfurization device - Google Patents

High-efficiency flue gas dust-removal desulfurization device Download PDF

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Publication number
CN201807279U
CN201807279U CN2010205636754U CN201020563675U CN201807279U CN 201807279 U CN201807279 U CN 201807279U CN 2010205636754 U CN2010205636754 U CN 2010205636754U CN 201020563675 U CN201020563675 U CN 201020563675U CN 201807279 U CN201807279 U CN 201807279U
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China
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absorption liquid
circulatory pool
flue gas
desulfurization
liquid circulatory
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CN2010205636754U
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任龙
刘忠生
彭德强
戴文军
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China Petroleum and Chemical Corp
Sinopec Fushun Research Institute of Petroleum and Petrochemicals
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China Petroleum and Chemical Corp
Sinopec Fushun Research Institute of Petroleum and Petrochemicals
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Abstract

The utility model relates to a high-efficiency flue gas dust-removal desulfurization device. The high-efficiency flue gas dust-removal desulfurization device comprises primary and secondary desulfurization units, primary and secondary absorption solution circulating pools and a demister, wherein the primary dust-removal desulfurization unit is a fair concurrent spray tower, and the lower part of the fair concurrent spray tower is provided with the primary absorption circulating pool; the secondary dust-removal desulfurization unit is the fair countercurrent spray tower, and the lower part of the countercurrent spray tower is provided with the secondary absorption solution circulating pool; and the primary absorption solution circulating pool and the secondary absorption solution circulating pool are in an integrated structure, and an overflow device is arranged between the primary absorption solution circulating pool and the secondary absorption solution circulating pool to ensure that the absorption solution of the secondary absorption solution circulating pool flows into the primary absorption solution circulating pool. Compared with the prior art, the high-efficiency flue gas dust-removal desulfurization device has the advantages of small occupied space, low investment, high desulfurization efficiency and the like.

Description

A kind of efficient flue-gas dust-removing and desulfurization device
Technical field
The utility model relates to a kind of flue-gas dust-removing and desulfurization device, is specially adapted to the dust-removal and desulfurizing process of catalytic gasoline adsorpting desulfurization device regenerated flue gas.
Background technology
Flue-gas dust-removing and desulfurization is mainly used in the industrial process of handling various generation sulphur-containing exhaust gas, as petrochemical industry, power industry etc.The catalytic gasoline adsorpting desulfurization device of oil refining industry adopts the S-zorb patented technology, this technology is carried out desulfurization based on the suction-operated principle to gasoline, the sulphur atom that optionally adsorbs in the sulfur-containing compound by adsorbent reaches the desulfurization purpose, the regeneration and adsorbents adsorb is burnt after saturated, residual sulphur atom oxidation in combustion process on the adsorbent, generate a large amount of sulfur dioxide, discharge with regenerated flue gas, the concentration of sulfur dioxide is up to 150000mg/m in this regenerated flue gas 3,, must administer in order to control its pollution to atmosphere.
The equipment of flue gas desulfurization technique employing at present mainly comprises spray column, packed tower, Venturi scrubber etc., but faces when containing the high concentration sulfur dioxide flue gas, single desulfurization reactor cost height, and occupation of land is big, and flue gas is difficult to qualified discharge.In order to reduce atmosphere pollution, the characteristics according to the discharging flue gas are necessary to develop a kind of technology of flue-gas dust-removing and desulfurization efficiently.
CN101301574A discloses a kind of multi-stage flue gas desulfurization spray column, comprises elementary desulfurizing scrubber and secondary desulfuration spray tower, and the outlet of described elementary desulfurizing scrubber and the inlet of secondary desulfuration spray tower are connected.This multi-stage flue gas desulfurization tower also comprises return duct, this tube connector is connected between the bottom and secondary desulfuration spray tower of elementary desulfurizing scrubber, thus, absorption liquid is back to secondary desulfuration spray tower through this return duct, is equivalent to circulatory pool of two-step desulfurization units shared.The technique effect that this technology realizes is an once desulfurization in elementary desulfurizing scrubber, secondary desulfurization in secondary desulfuration spray tower, circulatory pool of this technology two-step desulfurization units shared, do not form the grating zone of absorption liquid, desulfurization degree is not high, and this absorption of technology agent employing lime stone slurry, and the return duct between the two-step desulfurization unit only depends on gravity reflux, so reflux pipeline is easy to stop up this Chief Technology Officer period run reliability deficiency.
CN2608111Y discloses a kind of high concentration flue gas desulfurization and dedusting equipment, this technology is cascaded the above desulfurization unit of 2 covers, cover on together with the desulfurization unit of a shell series connection, the shared circulating slot in bottom, this technology circulatory pool is not handled at the characteristics of high concentration flue gas, only the above desulfurization unit of two covers is cascaded, and desulfuration efficiency can guarantee, but take up an area of greatlyyer, be not suitable for reserving less zone and use in the place.
Summary of the invention
At the deficiencies in the prior art and defective, the utility model provides a kind of new efficient flue-gas dust-removing and desulfurization device, and the utility model plant area area is little, and dust-removal and desulfurizing efficient height is invested lower.
The utility model flue gas desulfur device comprises two-step desulfurization unit, two-stage absorption liquid circulatory pool and demister.The primary dust removing desulfurization unit is the following current spray column, and the bottom of following current spray column is an one-level absorption liquid circulatory pool; The two-stage dust removal desulfurization unit is a countercurrent spray tower, and the countercurrent spray tower bottom is a secondary absorption liquid circulatory pool; One-level absorption liquid circulatory pool and secondary absorption liquid circulatory pool are structure as a whole, and between one-level absorption liquid circulatory pool and secondary absorption liquid circulatory pool overflow mechanism are set, and make the absorption liquid of secondary absorption liquid circulatory pool flow into one-level absorption liquid circulatory pool.
In the utility model, the major function of primary dust removing desulfurization unit is flue gas cool-down, dedusting and pre-desulfurization, and secondary desulfurization unit major function is the flue gas deep desulfuration.
In the utility model, in one-level absorption liquid circulatory pool, quick-fried device of air is set, is used for bubbling air or other oxygen-containing gas, with the sulphite in the oxidation absorption liquid.
In the utility model, one-level absorption liquid circulatory pool and secondary absorption liquid circulatory pool top communicate, enter secondary absorption liquid circulatory pool top at one-level absorption liquid circulatory pool top baffling behind the following current spray column of flue gas through the primary dust removing desulfurization unit, further enter the countercurrent spray tower of two-stage dust removal desulfurization unit.
In the utility model, demister is arranged on the top of two-stage dust removal desulfurization unit countercurrent spray tower.Primary dust removing desulfurizing tower spray structure is set to 1~3 grade of spray equipment, and two-stage dust removal desulfurizing tower spray structure is set to 2~4 grades of spray equipments.
In the utility model, one-level absorption liquid circulating pump and secondary absorption liquid circulating pump are set, one-level absorption liquid circulating pump is circulated to the following current spray column of primary dust removing desulfurization unit with the absorption liquid of one-level absorption liquid circulatory pool, and secondary absorption liquid circulating pump is circulated to the absorption liquid of secondary absorption liquid circulatory pool the countercurrent spray tower of two-stage dust removal desulfurization unit.
In the utility model, absorption liquid is set as required replenishes and exhausting equipment.
The utility model compared with prior art has the following advantages: this system adopts the mode of two-step desulfurization at first at the higher characteristics of SO 2 from fume concentration, and the pH of two two-stage absorption liquids is controlled at zones of different.First grade desulfurizing tower purpose is dedusting, cooling and pre-desulfurization, and the absorption liquid pH of secondary desulfurization can be controlled at the operation of high point, can guarantee the desulfuration efficiency of flue gas like this.Secondly in the bottom of one-level absorption liquid circulatory pool the air aeration system is set, is provided with like this and can need not to be provided with agitator, can reach the COD that reduces relief liquor again, reduced the floor space of desulfurizer.
Description of drawings
Fig. 1 is a kind of concrete process structure schematic diagram of the present utility model.
Wherein: 1, absorption liquid emptying pump, 2, one-level absorption liquid circulating pump, 3, secondary absorption liquid circulating pump, 4, absorption liquid feed pump, 5, absorption liquid storage tank, 6, secondary absorption liquid circulatory pool, 7, the secondary desulfuration spray tower, 8, purify the flue gas demister, 9, absorption liquid aerating system, 10, one-level absorption liquid circulatory pool, 11, the pre-desulfuration spray tower of one-level flue gas ash removal, 12, do not purify flue gas, 13, air-blaster.
The specific embodiment
When the utility model device was used for flue gas desulfurization, flue gas purified flue gas and dewaters after tower top discharge through demister successively by the pre-desulfurization unit of primary dust removing, secondary deep desulfuration unit.Absorption liquid at first enters secondary absorption liquid circulatory pool, flows into one-level absorption liquid circulatory pool certainly by the overflow mechanism in the middle of the I and II absorption liquid circulatory pool again, discharges after the absorption liquid desulfurization in the one-level circulatory pool.For improving the utilization rate of absorbent, mainly keep the pH value of one-level circulatory pool between 6~7 by controlling the amount that poor absorption liquid enters the secondary circulatory pool, the pH value of secondary circulatory pool can be controlled between 7~14, and the high pH of absorption liquid can play the effect of deep purifying flue gas in the secondary circulation fluid.
The utility model flue gas desulfur device is introduced desulfurization absorption liquid concentration grating theory first, and the one-level circulatory pool is final absorption liquid discharging pond, and its pH is controlled between 6~7.This technological process can be guaranteed the pH value of secondary absorption liquid circulatory pool between 7~14, and secondary desulfurizing and purifying unit can reach the purpose of high-efficiency desulfurization like this.The subregion of the pH of one-level absorption liquid circulatory pool and secondary absorption liquid circulatory pool is controlled, and has promptly guaranteed the high efficiency of this fume desulphurization method, can guarantee the utilization rate that the desulfurization absorption liquid is higher again.
The utility model is for saving floor space, make full use of the confined space, the absorption liquid aerating system is arranged in the one-level circulatory pool, the primary dust removing desulfurization unit is mainly brought into play its cooling dedusting function, contain solid particle inevitably after the absorption liquid washing, aerating system is set in the one-level circulatory pool can need not to be provided with in addition agitator, can reach the purpose that reduces absorption liquid COD again, setting promptly can reduce investment significantly like this, can reduce the plant area area again.The utility model flue gas desulfurization technique goes for various flue gas desulfurization courses, is specially adapted to catalytic gasoline adsorption desulfurize regenerated flue gas dust-removal and desulfurizing process.
The spray progression that the utility model can be determined the I and II desulfurizing tower according to the flow and the concentration of flue gas.Adopting above-mentioned sulfur method is that the flue gas that contains high concentration sulfur dioxide enters the pre-desulfurizing tower of primary dust removing, secondary high-efficiency desulfurization tower successively, form the desulfurization reaction zone of the mixing of gas-liquid height, mass transfer, heat transfer, flue gas is finished twice with absorption liquid and is fully contacted, realize the efficient purification of flue gas, flue gas after the desulfurization enters the demister on secondary desulfurizing tower top, and the purification flue gas after the dehydration is through the cat head high altitude discharge.The absorption liquid that desulphurization system is used is delivered to secondary absorption liquid circulatory pool from the absorption liquid storage tank by the absorption liquid feed pump, the higher absorption liquid of secondary circulatory pool pH value by the dividing plate direct current of I and II absorption liquid circulatory pool centre to one-level absorption liquid circulatory pool.
The dust fine grained that primary dust removing removes with desulfurizing tower flows downward and falls into down departmental level absorption liquid circulatory pool, a sulphite part that generates recycles as absorption liquid, discharges as the harmless aqueous solution after the air aeration system oxidation of a part through being provided with at the bottom of the pond.
Install a soda acid adjusting device additional at one-level absorption liquid circulatory pool, this adjusting device is made up of acid-base value monitoring device and flow regulator, its pH value can be regulated according to the variation of actual load, and its control method is to automatically adjust by the quantity delivered of carrying the absorption liquid of making secondary absorption liquid circulatory pool.
The selection of desulfurizing agent in the flue gas desulfurization technique, and concrete Selection of technological conditions can be determined by this area general knowledge according to the sulfur content and the discharge standard of flue gas.Desulfurizing agent can use solution, also can use slurries.
This device gas-liquid contact area is big, and the absorption reaction of gas is good, and the pressure loss is little, and is applicable to that processing contains the flue gas of high concentration sulfur dioxide.
Below in conjunction with accompanying drawing, specify principle of the present utility model, technical process and preferred forms.
This device is mainly by the absorption liquid supply unit, and gas cleaning unit and absorption liquid processing unit are formed, and described adsorption liquid supply unit is made up of absorption liquid storage tank 5, absorption liquid feed pump 4, one-level absorption liquid circulating pump 2, secondary absorption liquid circulating pump 3; Described gas cleaning unit comprises the pre-desulfurizing tower 11 of primary dust removing, one-level absorption liquid circulatory pool 10, secondary desulfuration spray tower 7, secondary absorption liquid circulatory pool 6, demister 8 compositions; Described absorption liquid processing unit is air aeration system 9 and the air blast 13 in the one-level absorption liquid circulatory pool.
The sulfur method of said system and concrete technology are as follows: flue gas at first enters the pre-desulfurizing tower 11 of primary dust removing, is neutral absorption liquid with the pH value and fully contacts in this process, finishes cooling, dedusting and pre-sweetening process in this process.Pretreated flue gas enters in the secondary desulfuration spray tower 7 again, fully contacts and finishes final sweetening process with absorption liquid that the pH value is alkalescence in this tower, and the flue gas after the desulfurization discharges through secondary desulfurizing tower top demister 8 dehydration backs.Absorption liquid generates sulphite, bisulfites and part of sulfuric acid salt after fully absorbing sulfur dioxide, and the air aeration system of one-level absorption liquid circulatory pool inside can become sulfate with sulfite oxidation, can reduce the COD that sends absorption liquid to some other department like this.Absorption liquid is squeezed into desulfurizing towers at different levels by one-level absorption liquid circulating pump 2, secondary absorption liquid circulating pump 3 respectively, and spray forms following current and adverse current state with flue gas in cleaning system from the top down, forms the high-efficiency desulfurization reaction zone of the mixing of gas-liquid height, mass transfer, heat transfer.
Its specific practice is: by absorption liquid feed pump 4 certain density absorption liquid in the absorption liquid storage tank 5 is squeezed in the secondary absorption liquid circulatory pool 6, the spray equipment of squeezing into secondary desulfurizing tower 7 by secondary absorption liquid circulating pump 3 sprays downwards, from flowing into one-level absorption liquid circulatory pool 10, absorption liquid is squeezed into the pre-desulfurizing tower 11 top spray equipments of primary dust removing by one-level absorption liquid circulating pump 2 and is sprayed downwards when liquid level reaches middle overflow mechanism dividing plate top.Absorption liquid contacts with the flue gas that passes through desulphurization reaction takes place, when exhaust gas volumn and sulfur in smoke concentration change, can control the input quantity that enters desulfurization absorption liquid in the secondary absorption liquid circulatory pool 6 by the soda acid monitoring device in the one-level absorption liquid circulatory pool 10, reach best desulfurization environment.Cleaning flue gases after the purification is by demister 8 dehydration back dischargings.Absorption liquid is handled the back discharging by aerating system at the bottom of the pond 9 in the one-level absorption liquid circulatory pool 10.
Embodiment
Certain oil refining enterprise catalytic gasoline adsorbent equipment regenerated flue gas, SO 2Content is 100000mg/Nm 3Adopt the utility model desulfurizer.Absorbent is magnesia unslacked slurries (solids content is 10wt%), and the pre-desulfurizing tower liquid-gas ratio of primary dust removing is controlled to be 3L/M 3, gas residence time is 2 seconds, adopts the secondary spray equipment, secondary desulfurizing tower liquid-gas ratio is controlled to be 8L/M 3, gas residence time is 3 seconds, adopts 4 grades of spray equipments, flue gas desulphuization rate reaches 99.5%.
Certain oil refining enterprise catalytic gasoline adsorbent equipment regenerated flue gas, SO 2Content is 140000mg/Nm 3Adopt the utility model sulfur removal technology and device.Absorbent is caustic lye of soda (sodium hydrate content is 5wt%), and the pre-desulfurizing tower liquid-gas ratio of primary dust removing is controlled to be 2L/M 3, gas residence time is 2 seconds, adopts the secondary spray equipment, secondary desulfurizing tower liquid-gas ratio is controlled to be 4L/M 3, gas residence time is 3 seconds, adopts 4 grades of spray equipments, flue gas desulphuization rate reaches 99.6%.
Certain coal-fired plant flue gas, SO 2Content is 3000mg/Nm 3Adopt the utility model sulfur removal technology and device.Absorbent is magnesia unslacked slurries (solids content is 5wt%), and the pre-desulfurizing tower liquid-gas ratio of primary dust removing is controlled to be 2L/M 3, gas residence time is 2 seconds, adopts the one-level spray equipment, secondary desulfurizing tower liquid-gas ratio is controlled to be 5L/M 3, gas residence time is 3 seconds, adopts 3 grades of spray equipments, flue gas desulphuization rate reaches 95%.

Claims (8)

1. an efficient flue-gas dust-removing and desulfurization device comprises two-step desulfurization unit, two-stage absorption liquid circulatory pool and demister, it is characterized in that: the primary dust removing desulfurization unit is the following current spray column, and the bottom of following current spray column is an one-level absorption liquid circulatory pool; The two-stage dust removal desulfurization unit is a countercurrent spray tower, and the countercurrent spray tower bottom is a secondary absorption liquid circulatory pool; One-level absorption liquid circulatory pool and secondary absorption liquid circulatory pool are structure as a whole, and between one-level absorption liquid circulatory pool and secondary absorption liquid circulatory pool overflow mechanism are set, and make the absorption liquid of secondary absorption liquid circulatory pool flow into one-level absorption liquid circulatory pool.
2. according to the described device of claim 1, it is characterized in that: in one-level absorption liquid circulatory pool, aerator is set.
3. according to the described device of claim 1, it is characterized in that: one-level absorption liquid circulatory pool and secondary absorption liquid circulatory pool top communicate, enter secondary absorption liquid circulatory pool top at one-level absorption liquid circulatory pool top baffling behind the following current spray column of flue gas through the primary dust removing desulfurization unit, further enter the countercurrent spray tower of two-stage dust removal desulfurization unit.
4. according to the described device of claim 1, it is characterized in that: demister is arranged on the top of two-stage dust removal desulfurization unit countercurrent spray tower.
5. according to the described device of claim 1, it is characterized in that: one-level absorption liquid circulating pump and secondary absorption liquid circulating pump are set, one-level absorption liquid circulating pump is circulated to the following current spray column of primary dust removing desulfurization unit with the absorption liquid of one-level absorption liquid circulatory pool, and secondary absorption liquid circulating pump is circulated to the absorption liquid of secondary absorption liquid circulatory pool the countercurrent spray tower of two-stage dust removal desulfurization unit.
6. according to the described device of claim 1, it is characterized in that: absorption liquid is set replenishes and exhausting equipment.
7. according to the described device of claim 1, it is characterized in that: primary dust removing desulfurizing tower spray structure is set to 1~3 grade of spray equipment.
8. according to the described device of claim 1, it is characterized in that: two-stage dust removal desulfurizing tower spray structure is set to 2~4 grades of spray equipments.
CN2010205636754U 2010-10-13 2010-10-13 High-efficiency flue gas dust-removal desulfurization device Expired - Lifetime CN201807279U (en)

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Cited By (13)

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Publication number Priority date Publication date Assignee Title
CN102389704A (en) * 2011-10-21 2012-03-28 宜宾天原集团股份有限公司 Smoke wet desulphurization technology
CN102794103A (en) * 2012-09-04 2012-11-28 中电投远达环保工程有限公司 Double circulation U-shaped tower desulfurization system and process
CN103256608A (en) * 2013-05-23 2013-08-21 杭州国泰环保科技有限公司 Sludge incineration method
CN105597506A (en) * 2015-11-26 2016-05-25 攀钢集团攀枝花钢钒有限公司 Waste gas treatment system
WO2016116007A1 (en) * 2015-01-23 2016-07-28 北京博源恒升高科技有限公司 Method for waste gas dedusting and dedusting agent
CN106166440A (en) * 2016-08-30 2016-11-30 杭州玺清环保科技有限公司 A kind of twin-stage four district zoarium high effective desulphurization device
CN106422680A (en) * 2016-11-22 2017-02-22 杭州东日节能技术有限公司 Smelting off-gas purification treatment device and method capable of producing by-product sulfuric acid with the concentration being 40% or higher
CN106669361A (en) * 2015-11-05 2017-05-17 中国石油化工股份有限公司大连石油化工研究院 Method for production of sulfuric acid by flue gas desulfurization and for sulfuric acid purification and device thereof
CN106669360A (en) * 2015-11-05 2017-05-17 中国石油化工股份有限公司大连石油化工研究院 Method and apparatus for flue gas desulfurization and sulfuric acid production
CN109621688A (en) * 2018-11-23 2019-04-16 宜宾海丰和锐有限公司 A kind of carbide slag desulfuration system and method that by-product desulfurized gypsum yield can be improved
CN110898577A (en) * 2019-12-04 2020-03-24 广西金科环境工程有限公司 Dust removal method for dry tail gas in artificial board production
CN111111351A (en) * 2020-01-16 2020-05-08 广西金科环境工程有限公司 Artificial board drying tail gas dust removal device and method
CN111841283A (en) * 2020-07-31 2020-10-30 中冶焦耐(大连)工程技术有限公司 AS tail gas washing device and method

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Publication number Priority date Publication date Assignee Title
CN102389704A (en) * 2011-10-21 2012-03-28 宜宾天原集团股份有限公司 Smoke wet desulphurization technology
CN102794103A (en) * 2012-09-04 2012-11-28 中电投远达环保工程有限公司 Double circulation U-shaped tower desulfurization system and process
CN103256608A (en) * 2013-05-23 2013-08-21 杭州国泰环保科技有限公司 Sludge incineration method
CN103256608B (en) * 2013-05-23 2016-03-16 杭州国泰环保科技股份有限公司 sludge incineration method
US10744452B2 (en) 2015-01-23 2020-08-18 Beijing Boyuan Hengsheng High-Technology Co., Ltd. Method for waste gas dedusting and dedusting agent
WO2016116007A1 (en) * 2015-01-23 2016-07-28 北京博源恒升高科技有限公司 Method for waste gas dedusting and dedusting agent
EA035474B1 (en) * 2015-01-23 2020-06-23 Бейджинг Боюань Хэншэн Хай-Текнолоджи Ко., Лтд Method for waste gas dedusting and dedusting agent
CN106669360B (en) * 2015-11-05 2019-01-25 中国石油化工股份有限公司大连石油化工研究院 A kind of flue gas desulfurization and the method and apparatus for producing sulfuric acid
CN106669361B (en) * 2015-11-05 2019-03-19 中国石油化工股份有限公司大连石油化工研究院 A kind of flue gas desulfurization produces the method and apparatus of sulfuric acid and purifying sulfuric acid
CN106669361A (en) * 2015-11-05 2017-05-17 中国石油化工股份有限公司大连石油化工研究院 Method for production of sulfuric acid by flue gas desulfurization and for sulfuric acid purification and device thereof
CN106669360A (en) * 2015-11-05 2017-05-17 中国石油化工股份有限公司大连石油化工研究院 Method and apparatus for flue gas desulfurization and sulfuric acid production
CN105597506B (en) * 2015-11-26 2018-01-12 攀钢集团攀枝花钢钒有限公司 Exhaust treatment system
CN105597506A (en) * 2015-11-26 2016-05-25 攀钢集团攀枝花钢钒有限公司 Waste gas treatment system
CN106166440A (en) * 2016-08-30 2016-11-30 杭州玺清环保科技有限公司 A kind of twin-stage four district zoarium high effective desulphurization device
CN106422680A (en) * 2016-11-22 2017-02-22 杭州东日节能技术有限公司 Smelting off-gas purification treatment device and method capable of producing by-product sulfuric acid with the concentration being 40% or higher
CN106422680B (en) * 2016-11-22 2022-09-09 杭州东日节能技术有限公司 Smelting flue gas purification treatment device and method with byproduct sulfuric acid of more than 40%
CN109621688A (en) * 2018-11-23 2019-04-16 宜宾海丰和锐有限公司 A kind of carbide slag desulfuration system and method that by-product desulfurized gypsum yield can be improved
CN110898577A (en) * 2019-12-04 2020-03-24 广西金科环境工程有限公司 Dust removal method for dry tail gas in artificial board production
CN111111351A (en) * 2020-01-16 2020-05-08 广西金科环境工程有限公司 Artificial board drying tail gas dust removal device and method
CN111841283A (en) * 2020-07-31 2020-10-30 中冶焦耐(大连)工程技术有限公司 AS tail gas washing device and method

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