CN102872702A - Method for purifying harmful waste gas by combination of absorption and microelectrolysis and special device thereof - Google Patents
Method for purifying harmful waste gas by combination of absorption and microelectrolysis and special device thereof Download PDFInfo
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- CN102872702A CN102872702A CN2012103925753A CN201210392575A CN102872702A CN 102872702 A CN102872702 A CN 102872702A CN 2012103925753 A CN2012103925753 A CN 2012103925753A CN 201210392575 A CN201210392575 A CN 201210392575A CN 102872702 A CN102872702 A CN 102872702A
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Abstract
The invention discloses a method for purifying harmful waste gas by combination of absorption and microelectrolysis, which is used for removing volatile organic matters such as hydrocarbon, alcohol, ether, aldehyde, phenol, ketone, ester and amine and inorganic matters such as hydrogen sulfide, sulfur dioxide, nitric oxide and ammonia in airflow. The treating process of the method comprises the following steps: treated gas is introduced into an absorbing tower, wherein after the harmful gas is absorbed by absorbing liquid, the absorbing liquid is introduced into a microelectrolysis reactor formed by an iron mesh or iron filler and active carbon particles, and then the absorbed harmful substances are degraded, so that the absorbing effect is greatly improved, the possibility of secondary volatilization of the harmful substances is avoided. The method is especially applicable to treatment of harmful gaseous pollutants with bad water solubility such as chlorine-containing organic matters and toluene. The invention also discloses the special device and has the advantages of reasonable and simple structure, easiness in operation and use and high treating efficiency and the like.
Description
Technical field
The present invention relates to a kind of absorption in conjunction with method and the isolated plant thereof of little electrolytic cleaning pernicious gas; be particularly related to volatile organic matters such as from air-flow, removing hydrocarbon, alcohol, ether, aldehyde, phenol, ketone, ester and amine; the method and apparatus of the inorganic matters such as hydrogen sulfide, sulfur dioxide, nitrogen oxide and ammonia belongs to Air Pollution Control and environmental protection technical field.
Background technology
The volatile organic matters such as hydrocarbonaceous, alcohol, ether, aldehyde, phenol, ketone, ester and amine, the inorganic matters such as hydrogen sulfide, sulfur dioxide, nitrogen oxide and ammonia result from chemistry, pharmacy, spray paint, the various production processes such as Sewage Disposal.These pollutants are not only harmful, some or carcinogen, and also a large amount of discharging is gone back the localized region environment and has been produced and seriously influence.But because these gases or to have chemical constitution more stable be difficult for the characteristics of degraded, or threshold value are lower, brings very large difficulty to purified treatment.
Usually, adopting aqueous solution absorption process is one of main method of removing these pernicious gases, but that the subject matter of the method is absorptive capacity is limited, and absorption liquid is saturated easily.Solution after the absorption must further be processed, if directly send wastewater disposal basin back to, the product that is absorbed after the processing can evaporate again, will cause the generation of secondary pollution.How when improving absorption efficiency, the generation of avoiding again secondary pollution is urgent problem in this skilled industry application process.
The basic principle of liquid phase micro-electrolysis method is to utilize microelectrolysis process in electrode surface generation electrochemical reaction, produces strong oxidative free radical OH, HO
2And H
2O
2Deng, these strong oxidizing property materials and nuisance reaction finally are converted into harmless object to nuisance.General micro-electrolysis method is used for the wastewater treatment of chemical industry difficult degradation, and also to the technology report of little electrolysis, but document all concentrates in the processing of waste water and uses in the Chinese patent literature storehouse.Not yet see the report that micro electrolysis tech is applied to waste gas pollution control and treatment.
The objective of the invention is to design and the method and apparatus of a kind of liquid absorption in conjunction with little electrolysis be provided, be used for removing pernicious gas from air-flow, these pernicious gases that contain in the air-flow are effectively absorbed and degrade, thereby reach the purpose of cleaning harmful gas.
Summary of the invention
Primary technical problem to be solved by this invention is the method that a kind of purification of harmful waste gas is provided for existing background technology, it is to adopt to absorb in conjunction with little electrolytics reaction, be used for from air-flow except volatile organic matters such as dealkylation, alcohol, ether, aldehyde, phenol, ketone, ester and amine, the inorganic matters such as hydrogen sulfide, sulfur dioxide, nitrogen oxide and ammonia, these gaseous contaminants are degraded to chemically stable material, make absorption liquid recover absorbability, thereby reach gas purification and avoid the problem of secondary pollution purpose.
Another technical problem to be solved by this invention provides a kind of isolated plant that rational in infrastructure simple, easy operation is used, treatment effeciency is high that uses in said method.
The present invention solves the technical scheme that above-mentioned primary technical problem adopts: a kind of method that absorbs in conjunction with little electrolytic cleaning harmful exhaust, it is characterized in that pending hydrocarbonaceous, alcohol, ether, aldehyde, phenol, ketone, the volatile organic matter such as ester and amine, hydrogen sulfide, sulfur dioxide, the gas of the inorganic matter such as nitrogen oxide and ammonia imports absorption plant, after wherein pernicious gas is absorbed by liquid absorption, absorption liquid imports micro-electrolysis reactor, described micro-electrolysis reactor is comprised of iron net or filler and active carbon, harmful gas component in the liquid phase is further by the active carbon suction, then under the effect of the numerous micro cell that active carbon and iron net or filler consist of, material such as OH with strong reactivity have been produced, HO
2Deng free radical, these materials be dissolved in the solution and by the nuisance generation chemical reaction of charcoal absorption, make absorbed harmful substance be converted into chemically stable material, make absorption liquid recover absorbability, finally the gas phase nuisance is effectively absorbed removal.Useful is that described absorption and the reaction of little electrolytics are two operating unit steps of a continuous process.
The absorption plant that the present invention adopts is general gas-liquid absorption equipment such as spray column, packed tower, rotating stream tray scrubber or sieve-plate tower etc., absorption liquid generally adopts the pH value less than 7.5 acidic aqueous solution, example hydrochloric acid and sulfuric acid, the degradation rate of the nuisance under sour environment is higher.Can add the salt such as a certain amount of sodium chloride or sodium sulphate as electrolyte, electrolyte mass percent concentration concentration is generally 0.1%-25%.
Micro-electrolysis reactor of the present invention is generally cylinder or square structure, comprising ferrous material as the fixed anode of little electrolysis and active carbon as the adsorbent of nuisance and the negative electrode of little electrolysis, ferrous material as fixed electrode is generally netted or the structured packing structure, and the treatment effect of two types of materials is about the same.Mesh electrode mesh area is generally 1mm
2-2500mm
2Adjacent two web plates distance is generally 3mm-300mm, web plate quantity, mesh and apart from visual device size, activated carbon shape with process the parameter apolegamy such as tolerance, structured packing can be according to the relevant filling-material structure on the tower chemical industry equipment handbook such as the apolegamys such as Raschig ring, Pall ring or cascade ring.Active carbon as Fluidized Electrode is generally sphere or cylindricality, diameter is generally 0.1mm-40mm, activated carbon is generally 0.1%-90% in the pack completeness of liquid phase, and the best is 5%-20%, and the parameters such as the harmful gas concentration of specifically processing according to need, processing tolerance and processing requirements are selected.All fixed electrode materials should be below absorption liquid liquid level 100mm, so that it plays useful effect in the micro-electrolysis reactor.
The bottom of described micro-electrolysis reactor also is provided with aeration tube and blasts air in the reactor and strengthen chemical reaction, and makes the active carbon in the reactor be in fluidized state, constantly contacts with iron net or filler in being immersed in liquid phase, and micro-electrolysis reaction occurs.The top that the aeration gas vent is arranged on reactor communicates with the absorption tower.Can regularly replace after ferrous material and the active carbon consumption, absorption liquid also regularly replaces.
The present invention solves the technical scheme that above-mentioned another technical problem adopts: the isolated plant in a kind of method of above-mentioned purification of harmful waste gas is characterized in that absorption tower and micro-electrolysis reactor form the emission-control equipment of continued operation.
Bottom, described absorption tower is provided with and contains harmful gas feed, gas vent after the top on absorption tower is provided with and purifies, the bottom on absorption tower is provided with the liquid-circulating groove, the bottom liquid outlet of circulating slot passes through circulating pump, pipeline is connected with the inlet of valve with top, absorption tower, the bottom on absorption tower is communicated with the top of micro-electrolysis reactor by liquid back pipe, liquid after making absorption saturated enters micro-electrolysis reactor, the drain pipe of micro-electrolysis reactor bottom is received the liquid-circulating groove of bottom, absorption tower, the micro-electrolysis reactor bottom also is provided with aeration tube and valve, and micro-electrolysis reactor top gas outlet is connected with the tower bottom.This device is installed and used easily, and is easy to operate, and treatment effeciency is high.
Compared with prior art, the invention has the advantages that: the mode that adopts Gas-Liquid Absorption and charcoal absorption and micro-electrolysis reaction to combine, make hydrocarbon, alcohol, ether, aldehyde, phenol, ketone, the volatile organic matter such as ester and amine, hydrogen sulfide, sulfur dioxide, the inorganic matter such as nitrogen oxide and ammonia is recycled the active carbon adsorption in absorption liquid absorption and the liquid phase, by the little electrolytics reaction of iron charcoal nuisance is degraded, thereby greatly improved assimilation effect, avoided the possibility of nuisance secondary volatilization, be specially adapted to water-soluble bad harmful gaseous pollutant such as chlorinated organics, the organic processing such as toluene, has the treatment effeciency height, simple to operate, reliable and practical.
Description of drawings
Fig. 1 is a kind of absorption of the present invention in conjunction with little electrolytic cleaning pernicious gas isolated plant structural representation, wherein label: 1 circulating pump; 2 absorption liquid circulating slots; 3 liquid level gauges; 4 filling openings; 5 gas feeds; 6 absorption towers; 7 absorption tower inlets; 8 gas vents; 9 escape pipes; 10 liquid back pipes; 11 micro-electrolysis reactors; 12 drain pipes; 13 aeration tubes.
This isolated plant structure is that 6 bottoms, absorption tower are provided with air inlet 5, the top on absorption tower is provided with gas outlet 8, the bottom on absorption tower 6 is provided with absorption liquid circulating slot 2, the bottom of circulating slot 2 has liquid outlet to pass through circulating pump 1, pipeline is connected with the absorption tower inlet 7 of valve with top, 6 top, absorption tower, the bottom on absorption tower 6 also is communicated with the top of micro-electrolysis reactor 11 by liquid back pipe 10, the drain pipe 12 of micro-electrolysis reactor 11 bottoms is received the circulating slot 2 of bottom, absorption tower, micro-electrolysis reactor 11 bottoms also are provided with aeration tube 13 and valve, and the bottom on absorption tower 6 also is communicated with the top of micro-electrolysis reactor 11 by escape pipe 9 and valve.
To be pending waste gas by air inlet 5 enter in the absorption tower 6 processing technological flow contacts with spray liquid, carries out absorption reaction, and the waste gas after the processing is 8 discharges from the cat head gas outlet.Absorption liquid enters micro-electrolysis reactor 11 by the liquid back pipe 10 of tower bottom, the bottom of micro-electrolysis reactor is provided with aeration tube 13 and blasts gas such as air or nitrogen reinforcement chemical reaction in reactor, and make the active carbon in the reactor be in fluidized state, constantly contact with iron net or filler in being immersed in liquid phase, make absorption liquid generation micro-electrolysis reaction, then after entering absorption liquid circulating slot 2 by drain pipe 12, return the absorption tower through circulating pump 1.
Fig. 2 is the structural representation of isolated plant embodiment 1 micro-electrolysis reactor of the present invention: parts label 1 drain pipe, 2 liquid back pipes, 3 escape pipes, 4 iron net anodes (from totally 4, can change according to processing tolerance and installing during actual the use), 5 active carbons, 6 is gas distributor, 7 aeration tubes.
Fig. 3 is the structural representation of isolated plant embodiment 2 micro-electrolysis reactors of the present invention: parts label 1 drain pipe among the figure, and 2 liquid back pipes, 3 escape pipes, 4 active carbons, 5 iron fillers, 6 is gas distributor, 7 aeration tubes.
The specific embodiment
Embodiment is described in further detail the present invention below in conjunction with accompanying drawing, but protection scope of the present invention is not limited to this.
Embodiment 1: the experimental provision system flow as shown in Figure 1, micro-electrolysis reactor adopts structure shown in Figure 2.Reactor ectosome material is polypropylene, is of a size of 400mm * 400mm * 1200mm, and adjacent iron net distance is 50mm, and iron net thickness is 2mm, and mesh is 5mm * 5mm.As the activated carbon granule of the utmost point that flows, the average geometric diameter is about 1mm, is about 15% in the pack completeness of liquid phase.The absorption tower is packed tower, and tower diameter is Ф 300mm, and bed stuffing height is 2500mm, and filler is the polypropylene cascade ring.Simulated exhaust is passed into by the tower bottom air inlet, behind the absorption reaction district, is discharged by top.
Experiment condition is: absorption liquid is the common salt aqueous solution+hydrochloric acid of 2%.PH value of solution=3 ± 0.5.
Gas flow: 200m
3/ h, gas temperature: 25 ℃.
The waste gas kind is common are the volatile organic matters such as the representational hydrocarbon of table, alcohol, ether, aldehyde, phenol, ketone, ester and amine, inorganic waste gases hydrocarbon, alcohol, ether, aldehyde, ketone, ester, sulfur dioxide and the nitrogen oxide such as hydrogen sulfide, sulfur dioxide, nitrogen oxide and ammonia.
Carrier gas: air.
Pump flow: 5m
3/ h.
Aeration rate: 2m
3/ h.
Experimental result is as shown in table 1.
Table 1 nuisance removal effect
Embodiment 2: the experimental provision system flow as shown in Figure 1, micro-electrolysis reactor adopts structure shown in Figure 3.Micro-electrolysis reactor adopts cylinder-like structure, and cylinder material is polypropylene, and diameter is 150mm, effective depth 800mm, and irony Pall ring diameter 25mm, thickness is 2mm.As the activated carbon granule of the utmost point that flows, the average geometric diameter is about 1mm, is about 15% in the pack completeness of liquid phase.The absorption tower is packed tower, and tower diameter is Ф 300mm, and bed stuffing height is 2500mm, and filler is the polypropylene cascade ring.。Simulated exhaust is passed into by the tower bottom air inlet, behind the absorption reaction district, is discharged by top.
Experiment condition is: absorption liquid is the sodium sulphate aqueous solution+sulfuric acid of 2%.PH value of solution=5 ± 0.5.
Other conditions are with embodiment 1.
Experimental result: as shown in table 2.
Table 2 nuisance removal effect
Claims (7)
1. an absorption is in conjunction with the method for little electrolytic cleaning harmful exhaust, it is characterized in that the pending air-flow that contains harmful gas is imported the absorption tower, after wherein pernicious gas is absorbed by liquid absorption, purified gas is discharged from the gas outlet of cat head, absorption liquid then further enters micro-electrolysis reactor, described micro-electrolysis reactor is comprised of iron net or iron filler and activated carbon granule, in the absorption liquid absorbed pernicious gas in micro-electrolysis reactor further by the active carbon suction, then under the effect of the numerous micro cell that the active carbon of fluidisation attitude and iron net or iron filler consist of, little electrolytics reaction occurs, make harmful substance be degraded to chemically stable material, absorption liquid recovers absorbability, returns to the absorption tower and absorbs pernicious gas.
2. method according to claim 1 is characterized in that described pernicious gas hydrocarbonaceous, alcohol, ether, aldehyde, phenol, ketone, ester and amine organic matter, one or more of hydrogen sulfide, sulfur dioxide, nitrogen oxide and ammonia inorganic matter.
3. method according to claim 1 is characterized in that the reaction of described absorption and little electrolytics is two operating unit steps of a continuous process.
4. method according to claim 1 is characterized in that described absorption tower is general gas-liquid absorption equipment spray column, packed tower, rotating stream tray scrubber or sieve-plate tower.
5. method according to claim 1, its feature is cylinder or square structure at described micro-electrolysis reactor, wherein is filled with as the ferrous material of little electrolytic anode with as the active carbon of nuisance adsorbent and little electrolysis cathode; Described ferrous material is netted or the structured packing structure, and mesh electrode mesh area is 1mm
2-2500mm
2, adjacent two web plates distance is 3mm-300mm, structured packing is the relevant filling-material structure on the chemical tower Hardware Description Manual, comprises Raschig ring, Pall ring or cascade ring; Described active carbon is sphere and cylindricality, and diameter is 0.1mm-30mm, is 0.1%-90% in the liquid phase pack completeness.
6. according to claim 1 or 3 or 5 described methods, the bottom of described micro-electrolysis reactor is provided with that aeration tube blasts air in the reactor or nitrogen is strengthened chemical reaction, and makes the granular activated carbon in the reactor be in fluidized state.
7. a kind of isolated plant that absorbs in conjunction with the method for little electrolytic cleaning harmful exhaust according to claim 1 is characterized in that described device comprises absorption tower, absorption liquid circulating slot and micro-electrolysis reactor; Bottom, described absorption tower arranges gas feed, liquid back pipe and muffler, and top is provided with inlet, and the top is provided with the purified gas outlet; The bottom liquid outlet of described absorption liquid circulating slot is connected with the inlet of valve with top, absorption tower by circulating pump, pipeline, be provided with iron net or iron filler and active carbon in the described micro-electrolysis reactor, the bottom also is provided with gas distributor, aeration tube and valve; The liquid back pipe of the bottom on described absorption tower and escape pipe are communicated with the micro-electrolysis reactor top respectively, and the drain pipe of micro-electrolysis reactor bottom is communicated with the liquid-circulating groove.
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Cited By (9)
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| CN104069720A (en) * | 2014-07-12 | 2014-10-01 | 苏州克利亚环保科技有限公司 | Comprehensive treatment device for industrial organic waste gas and waste water |
| CN104923058A (en) * | 2015-07-07 | 2015-09-23 | 国惠环保新能源有限公司 | External electric field fortified ferric carbon electrolysis flue gas denitration device and method |
| CN105417643A (en) * | 2015-11-11 | 2016-03-23 | 南京格洛特环境工程股份有限公司 | Oxidation and reduction double-effect micro electrolysis combined reactor and application thereof |
| CN105854553A (en) * | 2016-05-30 | 2016-08-17 | 黄立维 | Method and device for degrading harmful gas by combining absorption with photoelectric reaction |
| CN106334431A (en) * | 2016-09-28 | 2017-01-18 | 农业部沼气科学研究所 | Method for treating marsh gas and marsh liquid by electrolyte |
| CN107417493A (en) * | 2016-06-08 | 2017-12-01 | 黄华丽 | The method and apparatus that a kind of gas discharge collaboration solution absorption of light hydrocarbon is modified |
| CN107824021A (en) * | 2017-12-14 | 2018-03-23 | 侯梦斌 | The flue gas purifying equipment and technique of a kind of small scall coal-fired boiler |
| CN110237665A (en) * | 2019-07-24 | 2019-09-17 | 河北瑛泽环保科技有限公司 | A kind of electrocatalytic oxidation VOC controlling device |
| CN113171672A (en) * | 2021-04-14 | 2021-07-27 | 天津大学 | Waste gas purification device and method capable of simultaneously performing denitration, desulfurization and decarburization |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104069720A (en) * | 2014-07-12 | 2014-10-01 | 苏州克利亚环保科技有限公司 | Comprehensive treatment device for industrial organic waste gas and waste water |
| CN104923058A (en) * | 2015-07-07 | 2015-09-23 | 国惠环保新能源有限公司 | External electric field fortified ferric carbon electrolysis flue gas denitration device and method |
| CN105417643A (en) * | 2015-11-11 | 2016-03-23 | 南京格洛特环境工程股份有限公司 | Oxidation and reduction double-effect micro electrolysis combined reactor and application thereof |
| CN105854553A (en) * | 2016-05-30 | 2016-08-17 | 黄立维 | Method and device for degrading harmful gas by combining absorption with photoelectric reaction |
| CN107417493A (en) * | 2016-06-08 | 2017-12-01 | 黄华丽 | The method and apparatus that a kind of gas discharge collaboration solution absorption of light hydrocarbon is modified |
| CN107417493B (en) * | 2016-06-08 | 2022-05-03 | 黄华丽 | Method and device for modifying light hydrocarbon absorbed by gas discharge synergistic solution |
| CN106334431A (en) * | 2016-09-28 | 2017-01-18 | 农业部沼气科学研究所 | Method for treating marsh gas and marsh liquid by electrolyte |
| CN106334431B (en) * | 2016-09-28 | 2019-08-02 | 农业部沼气科学研究所 | A kind of method of electrolyte processing biogas and biogas slurry |
| CN107824021A (en) * | 2017-12-14 | 2018-03-23 | 侯梦斌 | The flue gas purifying equipment and technique of a kind of small scall coal-fired boiler |
| CN110237665A (en) * | 2019-07-24 | 2019-09-17 | 河北瑛泽环保科技有限公司 | A kind of electrocatalytic oxidation VOC controlling device |
| CN110237665B (en) * | 2019-07-24 | 2023-12-19 | 河北瑛泽环保科技有限公司 | Electrocatalytic oxidation VOC treatment device |
| CN113171672A (en) * | 2021-04-14 | 2021-07-27 | 天津大学 | Waste gas purification device and method capable of simultaneously performing denitration, desulfurization and decarburization |
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Application publication date: 20130116 |