CN108926975A - A kind of microwave plasma exhaust gas purifying method - Google Patents

A kind of microwave plasma exhaust gas purifying method Download PDF

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Publication number
CN108926975A
CN108926975A CN201810914239.8A CN201810914239A CN108926975A CN 108926975 A CN108926975 A CN 108926975A CN 201810914239 A CN201810914239 A CN 201810914239A CN 108926975 A CN108926975 A CN 108926975A
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exhaust gas
plasma
microwave plasma
reaction chamber
flow
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熊国华
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Meishan Golden Bean Intelligent Technology Co Ltd
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Meishan Golden Bean Intelligent Technology Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/32Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2259/00Type of treatment
    • B01D2259/80Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
    • B01D2259/806Microwaves
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2259/00Type of treatment
    • B01D2259/80Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
    • B01D2259/818Employing electrical discharges or the generation of a plasma

Abstract

The present invention relates to a kind of microwave plasma exhaust gas purifying methods, its process is that it occurs using microwave plasma as the plasma source for generating high energy active material, reaction chamber is communicated at the gas outlet of microwave plasma generator, air is passed through into microwave plasma generator, until after occurring the plasma flow of continuous-stable at gas outlet, exhaust gas to be clean is passed through into reaction chamber, plasma flow and exhaust gas mix in the reaction chamber, and contained high energy active material is discharged after machine object contained in exhaust gas is carried out oxygenolysis in plasma flow.By the diversion design of exhaust gas and plasma flow, effectively prevents the impurity such as volatile organic oxide and the dust in exhaust gas and microwave plasma generator functional component is stained.And then the service life of equipment is extended, it ensure that the clean-up effect that equipment is played;Simultaneously as exhaust gas without equipment inside, therefore allow plasma for purification is directly carried out without preceding processing.

Description

A kind of microwave plasma exhaust gas purifying method
Technical field
The present invention relates to off-gas cleaning equipment fields, and in particular to a kind of microwave plasma exhaust gas purifying method.
Background technique
In general, in such as oil plant, rubber plant, chemical plant, pharmaceutical factory, sewage treatment plant, refuse transfer station, kitchen garbage The places such as treatment plant, feed factory, printing and dyeing mill, spraying factory can generate a large amount of volatile organic matters, inorganic matter, hydrogen sulfide, ammonia, sulphur Alcohol, thioether, benzene etc. are poisonous and harmful and have the foul gas of intense irritation, also jeopardize people while destroying surrounding enviroment Health.
Chinese patent CN201621383660.3 is disclosed " a kind of combined type exhaust gas purification equipment ", including by pipeline according to The first spray absorber, microwave catalysis UV photolysis room, the second spray absorber and the plasma that secondary connection is arranged are anti- Device is answered, the plasma reactor includes that plasma-reaction-chamber and the air communicated with the plasma-reaction-chamber enter Mouthful, the gas outlet of the plasma reactor is connected with the microwave catalysis UV photolysis room.It is small with occupied area, from It is heavy and light, adaptable, it is not necessary that without adding any substance, secondary pollution will not be generated after processing in pretreatment and operational process, The high feature of security performance.
Chinese patent CN201720807202.6 is disclosed " a kind of industrial waste gas processing plasma oxidation device ", including Purify hermetically sealed can;It is divided into three chambers inside purification hermetically sealed can, from left to right respectively catalyst chamber, plasma oxidation room and purification Absorption chamber, the air inlet of catalyst chamber are equipped with ultraviolet lamp on tank skin up and down, and the rear portion of catalyst chamber is equipped with catalyzed honeycomb plate;Deng from Fixed frame is installed at the top of sub- oxidizing chamber, plasma emitter is installed below fixed frame;Purify the top peace of absorption chamber Equipped with spray tap, the gas outlet for purifying absorption chamber is equipped with demister.It can be handled, be realized to work by plasma oxidation The purified treatment of industry exhaust gas, and there is circular treatment treatment effect, energy-saving, environment-friendly and high-efficiency.
Chinese patent CN201810047660.3 discloses " a kind of based on low-temperature plasma, microwave and photo catalysis oxidation removal The method and apparatus of organic gas ", involved in device include electrostatic charged spray purifying column, reaction of low temperature plasma tower, Microwave and photo catalysis oxidation reaction tower, blower etc.;The electrostatic charged spray purifying column, reaction of low temperature plasma tower, catalysis oxidation are anti- Answer device and blower successively drop-over.The present invention degrades in advance to organic exhaust gas by charged vegetation water, dedusting, plasma, Microwave, ultraviolet light collective effect under, be greatly improved the activity of catalyst, extend catalyst service life, solve plasma Degradation be not thorough, secondary pollution, the high defect of operating cost.
Above scheme carries out the processing of exhaust gas by the combination of a variety of waste gas treatment equipments, wherein and with micro- The capital equipment of wave and the device of plasma special type as volatile organism oxygenolysis, can be realized at the purification to exhaust gas Reason, to guarantee that exhaust will not threaten to surrounding enviroment and human health.And occur as a kind of common plasma Device, microwave plasma apparatus are largely used in exhaust-gas treatment.For microwave plasma waste gas purification apparatus, benefit It uses Non-polarized lamp to light torch as plasma, drives Non-polarized lamp to issue high energy light by microwave circuit, so that air is situated between Matter generates ozone molecule and hydroxyl radical free radical largely with strong oxidizing property, and then makes in exhaust gas under the two effect Volatile organic oxide is further oxided decomposition, thus reach to volatile organic oxidation without catharsis.
But from above-mentioned patent described and the concrete application of the prior art in, it can be seen that in entire processing side In method, exhaust gas is that high energy particle by being then generated inside microwave plasma apparatus and active function groups oxygenolysis are net Change.Problem brought by this way is, since exhaust gas is contacted with the functional component in equipment, such as Non-polarized lamp, microwave circuit etc., make Functional component easily pollutes and aging is to influence the normal use of these components causes waste gas purification ineffective, together When the service life of functional component is reduced, failure rate increases, in turn result in using and maintenance cost increase, drawn high useless The cost of gas purification.
Secondly, the molecular components such as the oxygen gas and water of the raw material sources of plasma generation in exhaust gas, and some types is useless Such constituent content is relatively fewer in gas, to influence whether the amount of actually generating of high energy active material, and then influences purification Actual effect.And in order to guarantee clean-up effect, it usually needs take pre-treatment to exhaust gas, generate raw material to improve plasma Content, which again increases the complexities of processing equipment, have further drawn high equipment cost.
Summary of the invention
The present invention provides a kind of microwave plasma exhaust gas purifying methods, it is therefore intended that by changing in waste gas treatment process Flow through path, with solve in the prior art exhaust gas microwave plasma generator is stained and exhaust gas carry out it is plasma cleaning The problem of pre-treatment is usually required before processing.
The technical solution adopted by the invention is as follows:
A kind of microwave plasma exhaust gas purifying method uses microwave plasma that it occurs as generation high energy active material Plasma source, be communicated with reaction chamber at the gas outlet of microwave plasma generator, into microwave plasma generator lead to Enter air, until exhaust gas to be clean is passed through into reaction chamber after occurring the plasma flow of continuous-stable at gas outlet, etc. Gas ions air-flow and exhaust gas mix in the reaction chamber, and contained high energy active material is by machine contained in exhaust gas in plasma flow Object is discharged after carrying out oxygenolysis.
Wherein, microwave plasma generator refers to that the Non-polarized lamp for urging and being electrically connected with microwave circuit issues high energy light Line, make to be located at or by inside generator gas or air dissociate, and then generate and be rich in high energy particle and living radical group Plasma a kind of equipment.Its specific working principle and equipment construction, have had largely retouched in the prior art It states and application example, therefore this will not be repeated here;Between volatile organic oxide in its generated plasma and exhaust gas Reaction mechanism and its reaction process, be to have detailed retouch in the paper document referred in background technique file and the application It states, therefore does not also repeat them here herein.And microwave plasma generator itself in the technical scheme be not innovative point, therefore to its into Row simplifies description, reasonable and influence technique personnel do not implement the technical program.
Secondly, about by including ozone molecule, hydroxyl radical free radical, high energy particle caused by microwave plasma generator Reaction mechanism between high energy active material inside and the organic compound including hydrogen sulfide, nitric oxide, aldehyde ketone etc. And process, there are a large amount of descriptions in existing patent and paper document, technical staff can be by consulting relevant data It completely describes to recognize and understands relevant technical principle, therefore this will not be repeated here.
The working principle and the course of work of the technical program are as follows:
The method of existing corona treatment exhaust gas, exhaust gas are directly logical from the inside of microwave plasma generator It crosses.In this case, microwave plasma carried out by the initial fields that one side plasma and volatile organic oxide react Inside generator, each material concentration that initial reaction participates in is higher, and reaction is violent, to the functional component of microwave plasma generator It damages larger, is more vulnerable to influence especially as exposed Non-polarized lamp;On the other hand, some is volatile organic Oxide has certain corrosivity and adhesiveness, during passing through microwave plasma generator inside, after being adsorbed on On the inner surface of person, if things go on like this, each component inside microwave plasma generator will be generated different degrees of corrosion with And masking;When there are when the impurity such as dust, above-mentioned show can be more serious in exhaust gas.In these cases, it will to microwave etc. The normal operation of ion generator causes strong influence, results even in microwave plasma generator Frequent Troubles, Jin Erying The actual effect for arriving waste gas purification is rung, the increase of equipment operation and maintenance cost is also resulted in.In the technical scheme, by Reaction chamber is arranged in gas outlet one end of microwave plasma generator, to set up a bypass structure for exhaust gas circulation.This Under kind structure, the shunting between exhaust gas and the air generated for plasma can be realized, and make the two in its river outlet And its back segment carries out purification reaction.Specifically, air, usually cleaned air, passes through the air inlet pipe of microwave plasma generator The inside of microwave plasma generator is entered, at this time under the irradiation of Non-polarized lamp, oxygen molecule and hydrone in air are inhaled High energy light is received, the high energy active material generated including ozone, hydroxyl radical free radical is reacted or dissociate;This part high energy Active material is exited into from gas outlet into the reaction chamber being connected with gas outlet under the drive that air flows.It is same with this When, from the exhaust gas of the logical such as reaction chamber of exhaust piping, meets and mix with plasma flow;In contact and the mistake of mixed flow Cheng Zhong, contact with each other between the volatile organism matter in high energy active material and exhaust gas contained in plasma collision, It reacts, and then achievees the purpose that volatile organism matter decomposing, purifying.By purified exhaust gas, in organic oxygen Compound be decomposed go forward side by side single step reaction be to can discharge gas, can be directly discharged in external environment.
From above-mentioned working principle and in the process as can be seen that difference and existing plasma exhaust gas treatment technology and dress It sets, in the technical program, exhaust gas is not passed through microwave plasma generator, and microwave plasma generator utilizes to generate The gas of plasma is the cleaned air of extraneous input, therefore inside microwave plasma generator and is not present by exhaust gas The case where organic oxide and other impurities are stained, therefore can be realized and guarantee that each functional component of microwave plasma generator uses The maximization in service life.In addition to this, since the region that oxygenolysis occurs for organic matter in the access of exhaust gas and exhaust gas is respectively provided with Outside microwave plasma generator, it is no longer pass through the inside by the relative complex microwave plasma generator of structure, therefore useless Air-flow is logical almost without windage;In this case, the flowing velocity of exhaust gas significantly improves, and cooperation improves microblogging plasma and occurs at this time The power of device so as to generate more plasma flows in the unit time, and is input in reaction chamber and is given up by escape pipe Gas contact mixing, can significantly promote the purified treatment efficiency of exhaust gas.
In addition, also due to exhaust gas is not passed through inside microwave plasma generator, therefore, to the dust contained in exhaust gas, The physical property condition such as temperature of the substances such as moisture and exhaust gas requires to reduce, to reduce to exhaust gas pre-treatment, such as dedusting, drop The method requirement of temperature, wet down etc., and then exhaust gas purifying method is simplified, waste gas purification cost has been saved, device purification is improved Efficiency.
During the real reaction of exhaust gas organic matter, the high energy active material mainly includes ozone and hydroxyl radical free radical Any one of or two kinds.The reason is that being found by repetition test, ozone molecule and hydroxyl radical free radical are contained in the offgas Main function is played in the oxygenolysis of oxidation operation object, therefore should targetedly improve this in plasma flow two The content of kind high energy active material.Wherein by adjusting the wavelength and power of Non-polarized lamp, the generation of ozone can be significantly promoted Amount, increases the humidity of the air for generating plasma at the same time, can be in the case where ozone amount is substantially improved, into one Step is reacted by the moisture in ozone molecule and air and generates more hydroxyl radical free radicals;To sum up, it just enables to The content of ozone and hydroxyl radical free radical rises in gas ions air-flow.
Preferably, the reaction chamber is pipeline configuration, and exhaust gas to be clean flows through microwave plasma generator along pipeline and goes out Port and with from processing mouth flow out plasma flow mix after continue flow forward.Reaction chamber uses pipeline configuration, i.e., directly Connect by the gas outlet of microwave plasma generator be directly connected on the outer wall in exhaust gas flow pipe road and in exhaust gas flow pipe road Portion's connection, and using exhaust piping along a part after gas outlet of exhaust gas flow direction as reaction chamber.It is such Under mode, three functions, structure is discharged in exhaust gas after exhaust gas flow pipe road is provided simultaneously with exhaust gas circulation, oxygenolysis place, purification It is relatively simple, convenient for manufacture and maintenance, additionally it is possible to greatly save the manufacturing cost of equipment and the occupied area of equipment.
Preferably, the reaction chamber is any one of tank structure or body structure;Exhaust gas to be clean is passed through reaction Behind room, is mixed in the reaction chamber with the plasma flow flowed into from microwave plasma generator gas outlet and stop a timing Between.Compared to pipeline configuration, although larger in the structure volume of tank body or cabinet, it is likewise supplied with content volume and can The characteristics of storage retention is carried out to gas.In tank body or body structure, exhaust gas and plasma flow can stop one section Time, specific time are determined by the volume size of tank body or cabinet, so that when the two can have more fully contact Between.The extension of time of contact is thought higher to the utilization rate of high energy active material, can reduce the use of high energy active material Amount can also reduce the energy while saving equipment cost and disappear to reduce the requirement to microwave plasma generator power Consumption.Further, since crown_interception enables exhaust gas to obtain more fully reaction purification, so being more suitable for super large air quantity Handle scene.
Preferably, concentration of the high energy active material in plasma flow is 85~102ppm.Under above-mentioned concentration, It can either guarantee that plasma flow to the oxygenolysis of organic oxide in exhaust gas, and can control the energy of equipment Consumption, to accomplish the balance between clean-up effect and energy conservation.
More preferably, it is 100000~500000m that exhaust gas to be clean, which is passed through the flow velocity of reaction chamber,3/h;Plasma The flow velocity that air-flow is passed through reaction chamber is 300~500m3/h。
More preferably, the residence time of exhaust gas to be processed and the mixed gas of plasma flow in the reaction chamber For 3~8s.By repetition test, under the above conditions, flue gas leading should after escape pipe junction there are enough length, To guarantee the sufficient reaction time between exhaust gas and plasma flow.And under the flow of the technical program, the residence time is 3 The time of~8s can guarantee that exhaust gas adequately purifies, and can be avoided the residence time and excessively extend and lead to the unit time The low problem of interior exhaust-gas treatment amount.
Preferably, exhaust gas to be clean is passed through reaction chamber after depositing dust is handled again.By the design of exhaust gas circulation bypass, make It obtains exhaust gas and does not pass through microwave plasma generator, also just without having to worry about in the magazines such as dust contained in exhaust gas pollution generator Portion's environment still can i other words this exhaust gas purifying method has without pre-treatment to cause to be stained to the latter's internal components The characteristics of guaranteeing waste gas purification.But when this purification method apply to the waste gas purification taste removal of food-processing industry in use, Since the dust contained in exhaust gas is mostly the clast of food, that is, contain the dust impurities of suitable content organic matter.If without removing Dirt operation, such organic dust can consume a part of high energy active material, cause the actual purification smell removal effect of exhaust gas It reduces.Therefore, this, which is in front of exhaust gas is passed through reaction chamber, is dusted processing, can effectively guarantee high energy active material useless Utilization rate on gas purification smell removal, to improve waste gas purification effect.
More preferably, the depositing dust processing is the following steps are included: 1) exhaust gas to be processed is carried out by expansion chamber first The preliminary sedimentation of dust;2) exhaust gas through preliminary sedimentation passes through pre-leaching tower again and is once given a dinner of welcome;3) exhaust gas through once giving a dinner of welcome Reaction chamber is passed through after carrying out secondary give a dinner of welcome by spray column again.Wherein, expansion chamber can effectively remove the biggish dust of degranulation Grain, and the smaller dust of particle is assembled, in order to the washout of subsequent spray.Pre-leaching tower is used for the smaller dust of wet granulate And the smaller dust of partial particulate is removed, and spray column is then used for the washout of the residual dust particle in exhaust gas after pre-leaching tower.It is logical Often, the distribution in spray column is provided with than spray heads more in pre-leaching tower, and uses multilevel hierarchy spray structure, in order to useless It can obtain preferably removing effect when air-flow is through in spray column, to guarantee the dust separation effect of exhaust gas.
More preferably, the purified rear recycling of shower water used for the pre-leaching tower and spray column spray. It is recycled by water, can significantly save spray-water, to save the cost of spraying and dedusting.Specifically, shower water usually passes through Circulating water pool, water circulating pump realize that circulation and the recirculating water purification system connected with circulating water pool are realized.Recirculated water passes through circulation Water pump is pumped into pre-leaching tower and spray column along shower water pipeline, after completing to the spray washing of exhaust gas, by be set to pre-leaching tower and The recovery line for spraying tower bottom returns in circulating water pool.Recirculated water in circulating water pool is delivered to water purifier by water process pump Purification is by completing circulation in small pump blowback circulating water pool.Particularly, clear water is additionally provided between water purifier and small pump Pond, purified recirculated water can be stored in clear water reserviors, while clear water reserviors can also be supplemented by extraneous clean water source, This makes it possible to guarantee that shower water can be supplemented timely, to guarantee the abundance of recirculated water water in circulating water pool.
Preferably, the exhaust gas after high energy active material oxygenolysis leads to high-altitude nature by pipeline autoreaction room top Discharge.By the technical program treated exhaust gas, the volatile organic oxidation contained is endlessly by microwave plasma generator The high energy active material of generation sufficiently react be decomposed into can discharge gas, and have reached discharge standard, therefore can directly arrange It puts.Meanwhile high altitude discharge is selected, on the one hand since processing component is larger, there are insecurity factors for low-altitude discharged, on the other hand then Since the carbon dioxide isoconcentration that oxidation generates is relatively high, high altitude discharge is conducive to its dilution and by nature Rapid Circulation benefit With.
In conclusion compared with the prior art, the invention has the advantages that:
(1) by the diversion design of exhaust gas and plasma flow, change in the prior art exhaust gas directly through microwave The method that purified treatment is carried out inside plasma generator, effectively prevents volatile organic oxide and the dust in exhaust gas Equal impurity are stained microwave plasma generator functional component.And then the service life of equipment is extended, it ensure that equipment institute The clean-up effect played;
(2) exhaust gas is not necessarily to the preceding processing including carrying out including dedusting etc. before being purified using plasma flow, because This equally realizes organic oxide in exhaust gas and purifies while simplifying waste gas purification step and saving clarification time and cost Purpose;
(3) expansion chamber simple by structure, lower-cost completes the sedimentation of dust particle, avoids the prior art Middle pre-treatment uses the promotion of cost brought by the complicated technologies such as absorption;
(4) after dust removes, clean-up effect can significantly improve exhaust gas;
(5) by reasonable state modulator, the better balance of clean-up effect, purification efficiency and energy consumption is achieved, To improve the practical cost performance of waste gas purification technique;
(6) clear principle, structure is simple, the cost for convenient for using in Practical Project and being transformed, and using and being transformed compared with It is low, in conjunction with the protective effect to expensive microwave plasma generator, waste gas purification technique can be significantly reduced, and Suitable for large area low-cost popularization.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of microwave plasma waste gas purification apparatus in embodiment 6
Fig. 2 is a kind of structural schematic diagram of microwave plasma waste gas purification apparatus in embodiment 7
Fig. 3 is the partial enlargement diagram of position A in Fig. 1 and Fig. 2
In the figure, it is marked as 1- air inlet, the second blower of 2-, 3- air inlet pipe, 4- microwave plasma generator, 5- outlet Pipe, 6- exhaust air hose, the first blower of 7-, 8- spoiler, 9- flue gas leading, 10- check (non-return) valve, 11- reaction chamber, 12- are vented blast main, 13- spray column, 14- pre-leaching tower, 15- expansion chamber, 16- small pump, 17- clear water reserviors, 18- water process pump, 19- water purifier, 20- mistake Cross pond, 21- circulating water pool, 22- water circulating pump.
Specific embodiment
All features disclosed in this specification can be with any other than mutually exclusive feature and/or step Mode combines.
In order to make those skilled in the art more fully understand technical solution of the present invention, below with reference to specific embodiment The present invention is described in further detail.
Embodiment 1
A kind of microwave plasma exhaust gas purifying method uses microwave plasma that it occurs as generation high energy active material Plasma source, be communicated with reaction chamber at the gas outlet of microwave plasma generator, into microwave plasma generator lead to Enter air, until exhaust gas to be clean is passed through into reaction chamber after occurring the plasma flow of continuous-stable at gas outlet, etc. Gas ions air-flow and exhaust gas mix in the reaction chamber, and contained high energy active material is by machine contained in exhaust gas in plasma flow Object is discharged after carrying out oxygenolysis.
Wherein, the reaction chamber is pipeline configuration;
Concentration of the high energy active material in plasma flow is 85ppm;
The flow velocity that exhaust gas to be clean is passed through reaction chamber is 100000m3/h;
The flow velocity that plasma flow is passed through reaction chamber is 300m3/h;
The residence time of the mixed gas of exhaust gas and plasma flow to be processed in the reaction chamber is 8s.
Embodiment 2
A kind of microwave plasma exhaust gas purifying method uses microwave plasma that it occurs as generation high energy active material Plasma source, be communicated with reaction chamber at the gas outlet of microwave plasma generator, into microwave plasma generator lead to Enter air, until exhaust gas to be clean is passed through into reaction chamber after occurring the plasma flow of continuous-stable at gas outlet, etc. Gas ions air-flow and exhaust gas mix in the reaction chamber, and contained high energy active material is by machine contained in exhaust gas in plasma flow Object is discharged after carrying out oxygenolysis.
Wherein, the reaction chamber is pipeline configuration;
Concentration of the high energy active material in plasma flow is 90ppm;
The flow velocity that exhaust gas to be clean is passed through reaction chamber is 175000m3/h;
The flow velocity that plasma flow is passed through reaction chamber is 350m3/h;
The residence time of the mixed gas of exhaust gas and plasma flow to be processed in the reaction chamber is 7s.
Embodiment 3
A kind of microwave plasma exhaust gas purifying method uses microwave plasma that it occurs as generation high energy active material Plasma source, be communicated with reaction chamber at the gas outlet of microwave plasma generator, into microwave plasma generator lead to Enter air, until exhaust gas to be clean is passed through into reaction chamber after occurring the plasma flow of continuous-stable at gas outlet, etc. Gas ions air-flow and exhaust gas mix in the reaction chamber, and contained high energy active material is by machine contained in exhaust gas in plasma flow Object is discharged after carrying out oxygenolysis.
Wherein, the reaction chamber is tank structure, in particular one large-scale slack tank, and bottom is connected to gas outlet, side wall and Exhaust gas is passed through pipeline connection, and top is communicated with the exhaust duct for exhaust.
Concentration of the high energy active material in plasma flow is 94ppm;
The flow velocity that exhaust gas to be clean is passed through reaction chamber is 250000m3/h;
The flow velocity that plasma flow is passed through reaction chamber is 400m3/h;
The residence time of the mixed gas of exhaust gas and plasma flow to be processed in the reaction chamber is 6s;
Embodiment 4
A kind of microwave plasma exhaust gas purifying method uses microwave plasma that it occurs as generation high energy active material Plasma source, be communicated with reaction chamber at the gas outlet of microwave plasma generator, into microwave plasma generator lead to Enter air, until exhaust gas to be clean is passed through into reaction chamber after occurring the plasma flow of continuous-stable at gas outlet, etc. Gas ions air-flow and exhaust gas mix in the reaction chamber, and contained high energy active material is by machine contained in exhaust gas in plasma flow Object is discharged after carrying out oxygenolysis.
Wherein:
The reaction chamber is that the reaction chamber is tank structure, in particular one medium-and-large-sized slack tank, and bottom and gas outlet connect Logical, side wall is passed through pipeline with exhaust gas and is connected to, and top is communicated with the exhaust duct for exhaust.
Concentration of the high energy active material in plasma flow is 98ppm.
The flow velocity that exhaust gas to be clean is passed through reaction chamber is 375000m3/h。
The flow velocity that plasma flow is passed through reaction chamber is 450m3/h。
The residence time of the mixed gas of exhaust gas and plasma flow to be processed in the reaction chamber is 4s;
Exhaust gas to be clean is passed through reaction chamber after depositing dust is handled again;The step of depositing dust processing are as follows: 1) exhaust gas to be processed The preliminary sedimentation of dust is carried out by expansion chamber first;2) exhaust gas through preliminary sedimentation passes through pre-leaching tower again and is once given a dinner of welcome; 3) exhaust gas through once giving a dinner of welcome, which passes through again after spray column carries out secondary give a dinner of welcome, is passed through reaction chamber.
Preferably, the purified rear recycling of shower water used for the pre-leaching tower and spray column spray.
Embodiment 5
A kind of microwave plasma exhaust gas purifying method uses microwave plasma that it occurs as generation high energy active material Plasma source, be communicated with reaction chamber at the gas outlet of microwave plasma generator, into microwave plasma generator lead to Enter air, until exhaust gas to be clean is passed through into reaction chamber after occurring the plasma flow of continuous-stable at gas outlet, etc. Gas ions air-flow and exhaust gas mix in the reaction chamber, and contained high energy active material is by machine contained in exhaust gas in plasma flow After object carries out oxygenolysis, high-altitude is led to by pipeline autoreaction room top and discharges discharge naturally.
Wherein:
The reaction chamber is body structure, and specific is a large-scale empty van, and bottom is connected to gas outlet, side wall and exhaust gas It is passed through pipeline connection, top is communicated with the exhaust duct for exhaust.
Concentration of the high energy active material in plasma flow is 102ppm.
The flow velocity that exhaust gas to be clean is passed through reaction chamber is 500000m3/h。
The flow velocity that plasma flow is passed through reaction chamber is 500m3/h。
The residence time of the mixed gas of exhaust gas and plasma flow to be processed in the reaction chamber is 3s;
Exhaust gas to be clean is passed through reaction chamber after depositing dust is handled again;The step of depositing dust processing are as follows: 1) exhaust gas to be processed The preliminary sedimentation of dust is carried out by expansion chamber first;2) exhaust gas through preliminary sedimentation passes through pre-leaching tower again and is once given a dinner of welcome; 3) exhaust gas through once giving a dinner of welcome, which passes through again after spray column carries out secondary give a dinner of welcome, is passed through reaction chamber.
Preferably, the purified rear recycling of shower water used for the pre-leaching tower and spray column spray.
Embodiment 6
Based on Examples 1 to 2, such as Fig. 1,3, it is net using microwave plasma exhaust gas of the present invention that the present embodiment provides a kind of The equipment that change method carries out waste gas purification processing, directlys adopt some in exhaust gas flow pipe road as reaction chamber, specific as follows:
A kind of microwave plasma waste gas purification apparatus, including microwave plasma generator 4;The microwave plasma generator 4 two sides are respectively arranged with and the air inlet pipe 3 and escape pipe 5 that are connected to inside microwave plasma generator 4;It further include flue gas leading 9;The escape pipe 5 is fixedly connected on the cylinder outer wall of the flue gas leading 9, and is connected to the inside of the flue gas leading 9.
The working principle and the course of work of this equipment are as follows:
In the technical scheme, by the way that flue gas leading 9 is arranged in 5 one end of escape pipe of microwave plasma generator 4, to build Found the bypass structure of one gas circulation.Under this structure, can be realized exhaust gas and for plasma generate air it Between shunting, and both to carry out purification reaction in its river outlet and its back segment.Specifically, air is sent out by microwave plasma The air inlet pipe 3 of raw device 4 enters the inside of microwave plasma generator 4, the oxygen at this time under the irradiation of Non-polarized lamp, in air Son and hydrone absorb high energy light, react or dissociate the high energy activity generated including ozone, hydroxyl radical free radical Substance;This part high energy active material is exited into from escape pipe 5 to escape pipe 5 under the drive that air flows to be connected Flue gas leading 9 in.At the same time, the exhaust gas passed through from flue gas leading 9 meets with plasma flow and with subsequent flowing Gradually mix;During contact and mixed flow, in high energy active material contained in plasma and exhaust gas Contact with each other collision between volatile organism matter, reacts, and then reaches the mesh to volatile organism matter decomposing, purifying 's.By purified exhaust gas, in organic oxide be decomposed go forward side by side single step reaction be to can discharge gas, then pass through The discharge of 9 tail end of flue gas leading.
Preferably, the tail end of the flue gas leading 9 is provided with the first blower 7.Generated suction is operated by the first blower 7 Power is able to drive exhaust gas and is flowed along flue gas leading 9, by the escape pipe 5 of microwave plasma generator 4 and the company of flue gas leading 9 The place of connecing simultaneously is contacted and is mixed with the plasma flow flowed out from escape pipe 5, to realize the mesh purified to exhaust gas 's.In addition, being a little for 9 tail end of flue gas leading is arranged in the first blower 7, flow through the first blower 7 exhaust gas have already passed through etc. from The purification of daughter, in volatile organic oxide be adequately broken and reacted and generate can discharge gas;This feelings It under condition, avoids organic oxide and 7 internal structural components of the first blower is stained, so that the first blower 7 uses the longevity Life significantly extends.
More preferably, exhaust air hose 6 is provided on first blower 7.It is vented air hose 6 by setting, can be realized The orientation discharge of exhaust gas after purified treatment;It the advantage is that, the sulfur-bearing, nitrogenous that can will may be generated after the purified processing of exhaust gas Oxide is oriented to extract and collect to improve the utilization rate of resource, or orientation is discharged into other auxiliary cleanup devices to reach To the purpose for absorbing emission reduction.For absorbing the objective for implementation of emission reduction, it is not only limited to sulfur-bearing, the nitrogenous oxygen that may be generated in exhaust gas Compound, can with when but the not reaction impurities such as be not limited in exhaust gas originally included dust.
Preferably, the head end of the air inlet pipe 3 is provided with the second blower 2 being connected to air inlet pipe 3.Generally, due to outlet Pipe 5 is connected to flue gas leading 9, and has exhaust gas to flow fast through in flue gas leading 9, so that the tail end in escape pipe 5 generates negative pressure;This is negative Pressure is outside air can be driven to flow into inside microwave plasma generator 4 from air inlet pipe 3, and drive and occur through microwave plasma The plasma that device 4 generates enters in flue gas leading 9 along escape pipe 5.But be when treating capacity is excessive, it is general require etc. from Daughter should also be as increasing considerably for amount, at this point, relying solely on the effect of negative pressure produced by exhaust gas flows to realize phase microwave Air is sucked inside plasma generator 4, it is clear that is meet demand.Increase by the second blower 2, can allow for technical staff according to Actual treating capacity freely controls the adjustable amount for entering air in microwave plasma generator 4, and then realizes to plasma Body supply freely regulates and controls, this makes it possible to provide sufficient plasma flow while improving exhaust-gas treatment speed, To ensure that the clean-up effect under fast state.
More preferably, air inlet 1 is provided on second blower 2.Compared to the second blower 2 directly from extraneous ring Generation of the air for plasma is directly extracted in border, it is contemplated that the construction site of waste gas purification processing, the quality of usual air It is poor, it can permit technical staff during designing intake channel by adding air inlet 1, before air inlet 1 Other auxiliary air purification devices are added at end, or that the entrance of inlet channel by air inlet 1 guided to air is relatively clean Net region can guarantee the cleanliness of the air entered in microwave plasma generator 4 in this way, effectively prevent institute in air The impurity of existing dust impacts the functional component inside microwave plasma-generator, to further improve micro- The service life of wave plasma generator 4.
Preferably, the flue gas leading 9, which is located on the inner wall of the tube body after escape pipe 5, is provided with several pieces of spoilers 8.It is logical Setting spoiler 8 is crossed, the mixture of plasma and exhaust gas is enabled to further to be disturbed during flowing, from And to contact and collide between the high energy active material and the volatile organic oxide in exhaust gas in plasma flow Chance greatly promotes, and then improves the efficiency and effect of purification reaction.
More preferably, check (non-return) valve 10 is provided in the escape pipe 5.Since escape pipe 5 and flue gas leading 9 connect between each other It is logical, due to the spoiler 8 that flue gas leading 9 designs, the windage of 9 endpiece of flue gas leading is increased to a certain extent;In this case, when useless When gas velocity is excessive, there are exhaust gas to flow backward risk in microwave plasma generator 4 from escape pipe 5.Once reverse irrigation amount is excessive, It equally will cause the pollution of 4 internal environment of microwave plasma generator, and then lead to being stained for functional component, influence microwave etc. The normal operation and service life of ion generator 4.By the way that check (non-return) valve 10 is arranged, the generation of above-mentioned phenomenon can be thoroughly avoided.
Embodiment 7
Based on embodiment 3~5, as shown in Figure 2,3, the present embodiment provides another kinds to use microwave plasma of the present invention The equipment of exhaust gas purifying method progress waste gas purification processing.
A kind of microwave plasma waste gas purification apparatus, including an at least microwave plasma generator 4;Described microwave etc. from The two sides of electronic generator 4 are respectively arranged with and the air inlet pipe 3 and escape pipe 5 that are connected to inside microwave plasma generator 4;It is described 3 end of air inlet pipe is connected with ventilating fan;It further include the reaction chamber 11 that top is provided with exhaust blast main 12;The escape pipe 5 is certainly The bottom of reaction chamber 11 extends in reaction chamber 11, so that plasma flow is passed into reaction chamber 11 from the bottom of reaction chamber 11 In;The reaction chamber 11 is provided with the air inlet for being passed through exhaust gas on the side wall of bottom.
Its working principle, essence is similar using the device scheme of pipeline configuration in embodiment 6, by by plasma Body air-flow and exhaust gas carry out diversion design, after influencing to avoid exhaust gas directly through the inside of microwave plasma generator 4 The internal part of person.But compared with Example 6, difference is, the device scheme in embodiment 6 utilizes exhaust gas flow pipe road Second half section as reaction chamber 11, mixes after exhaust gas flows through escape pipe 5 with plasma flow, and carries out oxidation point in the duct Solution reaction, and then achieve the purpose that purification smell removal;And in the present embodiment, exhaust gas and plasma flow meet simultaneously in reaction chamber 11 It can stay for some time in reaction chamber 11, due to the presence of residence time, the high energy in exhaust gas and plasma flow is living Property substance can there is the sufficient time to come into full contact with reaction, to further increase the purification efficiency in the unit time, improve The utilization rate of unit quantity high energy active matter, this feature are particularly suitable for the biggish working condition of exhaust gas air quantity.
Preferably, the reaction chamber 11 is tank body or body structure.Too many differences are had no between the two, are with principle Finger be it is identical, technical staff can with adaptation to local conditions select tank structure or body structure.Usually, live limited area When, it is suitable for selecting tank structure, it is flexible for installation and can be adjusted according to scene;And there is particular procedure workshop and can draw Under conditions of separating 11 region of reaction chamber, then a large-size box can be separately provided as reaction chamber 11, to realize unit The significantly promotion of time-triggered protocol air quantity.
It preferably, further include dust pelletizing system;The dust pelletizing system includes passing through the sequentially connected expansion chamber 15 of pipeline, pre-leaching Tower 14 and spray column 13;Exhaust gas passes sequentially through after expansion chamber 15, pre-leaching tower 14 and spray column 13 be dusted, from spray column 13 Bottom discharge, is being passed through in reaction chamber 11 by pipeline.By 3-stage dust-removal structure, reach the mesh that dust particles remove in exhaust gas , to reduce consumption of the dust particles to high energy active material, further improve the clean-up effect that the latter is played.
It should be noted that being a kind of preferred embodiment of dust pelletizing system as shown in Figure 3.Specifically, 15 He of expansion chamber At least one partition is provided in spray column 13 so that exhaust gas in each equipment can Tortuous flow, process can be lengthened, mentioned The effect of height sedimentation and spray.Wherein, the partition setting of expansion chamber 15, need to guarantee top or top of the exhaust gas from expansion chamber 15 Into then flowing to device bottom, then turn back and flowed at the top of equipment, arranged repeatedly and finally from the top of expansion chamber 15 Out;Above-mentioned setting can guarantee that dust particles effectively settle the bottom for being trapped in expansion chamber 15.And the partition setting of spray column 13, It need to guarantee that exhaust gas enters from the lower part of spray column 13, then be flowed to the top of spray column 13, turned back to the bottom of spray column 13 Portion's flowing, is finally discharged from the lower part of spray column 13, while spray head is set to after exhaust gas first flows up under repeatedly The turning point of flowing and generally use institute's layer spray head to increase spray flow;Above-mentioned setting can guarantee shower water and exhaust gas It comes into full contact with, to ensure that the effect of elution dedusting.For pre-leaching tower 14, be generally not provided with partition, exhaust gas from its Top or top flow into, and from its bottom or lower part outflow, spray head setting and exhaust gas flow through close air inlet one end of access On position and keep its spray direction consistent with the circulating direction of exhaust gas;Above-mentioned setting is mainly used for meeting pre-leaching tower 14 and tentatively remove The functional purpose of dirt and moistened dust, practical operational effect are excellent.
More preferably, pre-leaching tower 14 and spray column 13 are provided with water spray circulation system;Specifically, shower water is usual Realize that circulation and the recirculating water purification system connected with circulating water pool 21 are realized by circulating water pool 21, water circulating pump 22.Circulation Water is pumped into pre-leaching tower 14 and spray column 13 along shower water pipeline by water circulating pump 22, after completing to the spray washing of exhaust gas, leads to It crosses and is set in the recovery line return circulating water pool 21 of 13 bottom of pre-leaching tower 14 and spray column.Recirculated water in circulating water pool 21 The purification of water purifier 19 is delivered to by completing circulation in 16 blowback circulating water pool 21 of small pump by water process pump 18.Especially , clear water reserviors 17 are additionally provided between water purifier 19 and small pump 16, purified recirculated water can be stored in clear water reserviors 17, Clear water reserviors 17 can also be supplemented by extraneous clean water source simultaneously, and this makes it possible to guarantee that shower water can obtain timely Supplement, to guarantee the abundance of recirculated water water in circulating water pool 21.
Preferably, derivative height is not less than 5m vertically upward from the ground on the top of the exhaust blast main 12, more excellent Choosing is 10~15m, to realize the high altitude discharge of purified exhaust gas.
It is emphasized that the reaction chamber 11 as described in the present embodiment have due to larger volume it is certain stagnant Ability is stayed, so the processing air quantity within the unit time is significantly promoted.Therefore, during actual use, if there is It is a plurality of generate need purification smell removal exhaust gas pipeline, can access together reaction chamber 11 or together after dust pelletizing system It is passed through in reaction chamber 11, to realize the unified purified treatment of exhaust gas.In this way, on the one hand taking full advantage of the processing capacity of device And reduce the processing links of waste gas purification, the acquisition cost of equipment on the other hand can be reduced, production expenditure has been saved.
It should be added that several of 15 upper right corner of expansion chamber connect and is interrupted with expansion chamber 15 thin in Fig. 2 Line indicates several 3 lines of exhaust inlet pipe, and technical staff can according to need addition or reduce access pipeline to realize to production House exhaust uniformly collects and unifies purified treatment.When increasing pipeline, bearing in view of microwave plasma generator 4 is needed Load problem, it may be necessary to increase its quantity, to meet the needs of bigger exhaust-gas treatment amount.
Test example 1
The technical program is used for the processing of sulfide hydrogen exhaust gas.
Embodiment: using method described in embodiment 1, and most preferably equipment pair described in scheme in embodiment 6 is used Hydrogen sulfide initial content is 24.6mg/m3Exhaust gas handled;Record processing after cure hydrogen content value, and calculate hydrogen sulfide and go Except rate.
Test result is as shown in the table:
Hydrogen sulfide initial content Handle after cure hydrogen content Hydrogen sulfide removal rate
24.6mg/m3 1.3mg/m3 94.7%
Test example 2
The technical program is used for the processing of sulfide hydrogen exhaust gas.
Embodiment: using method described in embodiment 2, and most preferably equipment pair described in scheme in embodiment 6 is used Hydrogen sulfide initial content is 24.6mg/m3Exhaust gas handled;Record processing after cure hydrogen content value, and calculate hydrogen sulfide and go Except rate.
Test result is as shown in the table:
Hydrogen sulfide initial content Handle after cure hydrogen content Hydrogen sulfide removal rate
24.6mg/m3 0.9mg/m3 96.3%
Test example 3
The technical program is used for the processing of sulfide hydrogen exhaust gas.
Embodiment: using method described in embodiment 3, and most preferably equipment pair described in scheme in embodiment 7 is used Hydrogen sulfide initial content is 24.6mg/m3Exhaust gas handled;Record processing after cure hydrogen content value, and calculate hydrogen sulfide and go Except rate.
Test result is as shown in the table:
Hydrogen sulfide initial content Handle after cure hydrogen content Hydrogen sulfide removal rate
24.6mg/m3 0.5mg/m3 98.0%
Test example 4
The technical program is used for the processing of sulfide hydrogen exhaust gas.
Embodiment: using method described in embodiment 5, and most preferably equipment pair described in scheme in embodiment 6 is used Hydrogen sulfide initial content is 24.6mg/m3And contain 25mg/m3The exhaust gas of dust particles is handled;Record processing after cure hydrogen The content of content value and dust particles, and Ji Suan hydrogen sulfide and dust removal rate.
Test result is as shown in the table:
Hydrogen sulfide initial content Handle after cure hydrogen content Hydrogen sulfide removal rate
24.6mg/m3 0.05mg/m3 99.8%
Dust initial content Dust initial content after processing Dust removal rate
25mg/m3 0.45mg/m3 98.2%
Application examples
Application site: Vietnam XXX hopes aquatic products Co., Ltd production site, and the said firm mainly produces shrimp material products, due to shrimp Exhaust gas smell makes us extremely unhappy in material processing, therefore it is required that carrying out purification smell removal processing to exhaust gas.
Scheme is selected: purification device selects the optimal case in embodiment 7, to be transformed to existing workshop.
Specific embodiment: all sealings in workshop all concentrate on roof, and a ruler is built in existing workshop Tongliang County Then the very little rack for 20m*6m is arranged in circulation, expansion chamber, pre-leaching tower, spray column, reaction chamber in rack, And pipeline connection is carried out according to design.Then six waste lines in existing production line are accessed into expansion chamber.That collects is useless Gas after expansion chamber processing, reaches by pre-leaching tower and is passed through after spray column carries out secondary spraying again after depositing dust is handed in exhaust gas again Dust particles remove.Clean exhaust gas enters reaction chamber under the action of itself wind pressure.In the reaction chamber, the stink in exhaust gas Substance generates with the microwave plasma generator for being placed on 6 buildings workshops certainly that is, with the volatile organism of peculiar smell and is passed through reaction chamber In high energy active material (ozone and gunlock free radical) reaction of decomposing.By sufficiently reacting purified gas high-altitude certainly So discharge.
Installation processing air quantity is as shown in the table:
Waste line serial number Title Air quantity (m3/h)
1 3 shrimp stocklines 45000
2 1 bulked thread 70000
3 1 dehumidifying blower 3000
4 Pack thread 9000
5 It is primary to crush line 54000
6 Pulverize line 16000
Total air quantity 197000
Practical operation situation: from after the completion of being transformed, microwave plasma generator unit time internal fault rate has dropped 70%, Smell substance content standard in exhaust gas is discharged during cost of equipment maintenance has dropped 50%, and purification device is run is all satisfied locality Environmental requirement (in addition to the equipment fault phase) has fully met the enterprise and has obtained demand to exhaust gas peculiar smell purified treatment.
The specific embodiment of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously The limitation to the application protection scope therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art For, under the premise of not departing from technical scheme design, various modifications and improvements can be made, these belong to this The protection scope of application.

Claims (10)

1. a kind of microwave plasma exhaust gas purifying method, it is characterised in that: it occurs as generation high energy using microwave plasma The plasma source of active material is communicated with reaction chamber at the gas outlet of microwave plasma generator, sends out to microwave plasma It is passed through air in raw device, until being passed through into reaction chamber to be clean after occurring the plasma flow of continuous-stable at gas outlet Exhaust gas, plasma flow and exhaust gas mixes in the reaction chamber, and contained high energy active material is by exhaust gas in plasma flow Contained in machine object carry out oxygenolysis after be discharged.
2. a kind of microwave plasma exhaust gas purifying method according to claim 1, it is characterised in that: the reaction chamber is pipe Road structure, exhaust gas to be clean along pipeline flow through microwave plasma generator gas outlet and with from processing mouth flow out plasma Continue flow forward after air-flow mixing.
3. a kind of microwave plasma exhaust gas purifying method according to claim 1, it is characterised in that: the reaction chamber is tank Any one of body structure or body structure;After exhaust gas to be clean is passed through reaction chamber, and from microwave plasma generator outlet The plasma flow that mouth flows into mixes in the reaction chamber and stops certain time.
4. described in any item a kind of microwave plasma exhaust gas purifying methods according to claim 1~3, it is characterised in that: described Concentration of the high energy active material in plasma flow is 85~102ppm.
5. a kind of microwave plasma exhaust gas purifying method according to claim 4, it is characterised in that: exhaust gas to be clean is logical The flow velocity for entering reaction chamber is 100000~500000m3/h;The flow velocity that plasma flow is passed through reaction chamber is 300~500m3/h。
6. a kind of microwave plasma exhaust gas purifying method according to claim 5, it is characterised in that: exhaust gas to be processed and The residence time of the mixed gas of plasma flow in the reaction chamber is 3~8s.
7. described in any item a kind of microwave plasma exhaust gas purifying methods according to claim 1~3, it is characterised in that: to net The exhaust gas of change is passed through reaction chamber after depositing dust is handled again.
8. a kind of microwave plasma exhaust gas purifying method according to claim 7, which is characterized in that the depositing dust processing packet Include following steps: 1) exhaust gas to be processed carries out the preliminary sedimentation of dust by expansion chamber first;2) through the exhaust gas of preliminary sedimentation It is once given a dinner of welcome by pre-leaching tower again;3) exhaust gas through once giving a dinner of welcome, which passes through again after spray column carries out secondary give a dinner of welcome, is passed through reaction Room.
9. a kind of microwave plasma exhaust gas purifying method according to claim 8, it is characterised in that: for the pre-leaching tower and It is recycled after the shower water that the spray column spray uses is purified.
10. described in any item a kind of microwave plasma exhaust gas purifying methods according to claim 1~3, it is characterised in that: through height Exhaust gas after energy active material oxygenolysis leads to high-altitude by pipeline autoreaction room top and discharges naturally.
CN201810914239.8A 2018-08-13 2018-08-13 A kind of microwave plasma exhaust gas purifying method Pending CN108926975A (en)

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