CN1772347A - Adsorption-low temperature plasma synchronized desulfuring and denitrifying apparatus and method - Google Patents
Adsorption-low temperature plasma synchronized desulfuring and denitrifying apparatus and method Download PDFInfo
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Abstract
The adsorption-low temperature plasma synchronized desulfurizing and denitrifying apparatus has fume desulfurizing and denitrifying reactor comprising two identical adsorption-low temperature plasma reactors connected in parallel, and the synchronized desulfurizing and denitrifying method is to utilize these two plasma reactors inside two adsorption-low temperature plasma reactors alternately. Each of the reactors has one string-barrel or string-plate plasma generator and filled adsorbing catalyst grains; and one high voltage pulse power source is connected to these two reactors. Fume is made to enter one of these two reactors via the intake valve, and the fume with the SO2 and NOx eliminated is exhausted via the exhaust valve, draft fan and chimney to atmosphere. Meanwhile, the other reactor with adsorbed SO2 and NOx is separated from fume and has its plasma generator operate to convert SO2 into SO3, which is further converted into sulfuric acid in a concentrated sulfuric acid tank, and convert NOx into harmless N2.
Description
Technical Field
The invention relates to a device and a method for purifying sulfur dioxide and nitrogen oxide in tail gas after combustion of all coal-fired boilers and boilers taking sulfur-containing and nitrogen-containing substances as fuels, in particular to a device and a method for synchronously desulfurizing and denitrating by adsorption-low-temperature plasma, belonging to the technical field of flue gas desulfurization and denitration in waste gas treatment.
Background
The flue gas treatment technologies which are applied abroad and are still researched and developed are as follows:
1) NOXSO technology
The NOXSO technology is developed by cooperation of Pittsburgh energy center (PETC) of the U.S. department of energy and NOXSO company, is a dry absorption technology and can simultaneously remove SO in flue gas2And NOx. The absorbent is gamma-Al impregnated with sodium carbonate2O3Round ball (1.6mm), the treatment process includes the steps of absorption, regeneration, etc. The test is carried out on an LCTU device for generating flue gas by a 60kW generator set, and the process parameter to SO is researched2And the influence of the NOx removal rate, the change of the performance of the absorbent with the use time, the influence of the regeneration gas type on the regeneration effect, and the like. SO adopting the technology2The removal rate of the catalyst can reach 90 percent, and the removal rate of NOx can reach 70 to 90 percent.
2) SNOX technology
The SNOX technology was developed by the company Haldor-Tops Φ eA/S, Denmark, with Elkraft AMBA and KobehavnBelysning-Svaesen. It is prepared by reacting SO2Oxidation to SO3Then preparing sulfuric acid; NOx is removed by ammonia reduction. By adopting the process, 93-97% of SO can be eliminated2And 90% NOx. The technology is characterized in that no waste water and waste are generated; concentrated sulfuric acid can be recovered; can simultaneously remove SO2NOx; except for the need of NH3Besides reducing NOx, other chemicals are not needed in the whole treatment process; flue gas with temperature up to 270 ℃ and SO2Oxidation to SO3The heat generated can be used to preheat air or to produce steam. The process has low operation cost, and the cost is dependent on SO2The content increases and decreases.
3) dessonox/REDOX process
The DESONOX/REDOX process is developed by Degussa A.G and Stadtwerk M ü nster, and can remove SO in flue gas2NOx, CO and unburned hydrocarbons. NO is removed by an ammonia catalytic reduction method,oxidation of CO and hydrocarbons to CO2And water, SO2Conversion to SO3Then sulfuric acid is prepared. The process has the advantages that: SO (SO)2The method has the advantages of high NOx removal rate, no secondary pollution, simple technology, low investment and operation cost and suitability for old plant transformation. In which NOx is removed by selective catalytic reduction of ammonia using a variety of catalysts, e.g. V2O5/TiO2、Fe2O3Zeolites, and the like.
REDOX process: mixing the flue gas with ammonia, introducing the mixture into a REDOX reactor, and reducing NOx into N in the first stage of the reactor2And H2O, in the second stage of the reactor, CO and hydrocarbons are oxidized to CO2And H2And O, the concentration of pollutants contained in the tail gas is low, and the tail gas can be directly discharged into the atmosphere.
4) Urea process
The process for purifying the flue gas by the urea is jointly developed by units such as the Russian Mendeleev chemical process academy and the like, and can simultaneously remove SO2And NOx, SO2The removal rate of the catalyst is close to 100 percent, and the removal rate of NOx is more than 95 percent. The pH of the absorption liquid adopted by the process is 5-9, the absorption liquid has no corrosion effect on equipment, and SO2NOx removal rate and NOx and SO in flue gas2The concentration of the tail gas is irrelevant, the tail gas can be directly discharged, and the absorption liquid can be treated to recover ammonium sulfate.
5) Electron beam irradiation method
The electron beam irradiation method is to desulfurize and denitrate by high-energy electrons (400-800 keV) generated by a high-power electron gun. Irradiating the combusted waste gas with electrons to make SO in the waste gas2Gas molecules such as NOx, H2O and O2 are activated, ionized and even cracked to generate strong oxidizing substances (such as OH, HO)2Active particles of O) and oxidize SO2And NOx, to form H2SO4And HNO3Then ammonia is introduced to react with the ammonia to generate (NH) which can be used as an agricultural fertilizer4)2SO4And NH4NO3And (3) powder. The electron beam principle is that high-energy high-speed electrons can be generated by a direct-current high-voltage power supply and an electron accelerator to promote chemical reaction between molecules.The device for desulfurization and denitrification by electron beams consists of three parts, namely cooling equipment, reaction equipment and dust collecting equipment. When the electronic beam is used for desulfurization and denitrification, the original combustion furnace is not required to be modified, and only the waste flue gas after combustion is introduced into the treatment device. During operation, the waste gas is first fed into cooling tower, cooled with cooling water, mixed with ammonia gas inside the reactor and converted into (NH) through instantaneous chemical reaction under the irradiation of electron beam4)2SO4And NH4NO3And recovered by a dust collector and sent to granulation equipment for treatment. SO in exhaust gas2And NOx are changed into agricultural fertilizers, and the fertilizers manufactured by the method reach the effect of common fertilizers through cultivation experiments.
6) Pulsed corona plasma process
The pulse corona plasma method is to form plasma in a common reactor by means of pulse high voltage power supply to produceHigh-energy electrons (5-20 eV) are higher in energy efficiency by two times than that of an electron beam irradiation method because the electron temperature is only increased without increasing the ion temperature. The pulse corona plasma method has simple equipment and simple and convenient operation, the investment is 40 percent lower than that of an electron beam irradiation method, and the method is the leading edge of dry desulfurization at present. The pulse corona discharge method is a flue gas desulfurization and denitration technology developed from an electron beam method. The mechanism is basically the same as that of the electron beam method. The two main differences are that the latter uses a fast-rising narrow pulse electric field to accelerate to obtain high-energy electrons to form a non-equilibrium plasma state, a large amount of active particles are generated, and the energy consumption of driving ions is extremely low, so that the energy utilization rate is higher than that of the former, and meanwhile, the desulfurization and denitrification efficiency is higher. The method has the advantages of simple equipment, investment saving, convenient operation and less energy consumption for one-time treatment of desulfurization and denitrification of flue gas than the energy consumption for treating any gas currently, thereby becoming the leading edge of the international research on desulfurization and denitrification. At present, various national scholars consider that the electron beam method or the pulse corona discharge method for desulfurization and denitrification is the most preferable method, and the method is used for comprehensively treating SO2And NOx provide the possibility.
Disclosure of Invention
Technique ofThe problems are as follows: the invention aims to provide a method for making SO by using low-temperature plasma technology as a main material and combining an adsorption catalyst2And NOx are respectively carried out according to an oxidation reaction path and a reduction reaction path.
The technical scheme is as follows: the adsorption-low temperature plasma flue gas SO of the invention2The NOx synchronous removing device is formed by connecting two same adsorption-low temperature plasma reactors in parallel to form a flue gas desulfurization and denitrification reactor, a fan, a concentrated sulfuric acid tank and a fiber demister in series in sequence; the synchronous desulfurization and denitrification method is characterized in that the plasma generators in the two adsorption-low temperature plasma reactors are alternately used. A plurality of line-cylinder (or line-plate) type plasmagenerators are arranged in an adsorption-low temperature plasma reactor of the flue gas desulfurization and denitrification reactor, and are filled with adsorption catalysts which are compounds of gamma-Al 2O3, zeolite carriers, metals and metal oxides; the high-voltage pulse power supply is connected with the plasma generators in the two adsorption-low temperature plasma reactors; the main flue gas flows into one of two identical adsorption-low temperature plasma reactors through an air inlet valve, the flue gas from which sulfur dioxide and nitrogen oxides are removed is discharged through an exhaust valve of the adsorption-low temperature plasma reactor, and the flue gas is discharged into the atmosphere through an induced draft fan and a chimney; the other adsorption-low temperature plasma reactor adsorbing sulfur dioxide and nitrogen oxide is isolated from the flue gas, the plasma generator works, the flue gas containing sulfur dioxide and nitrogen oxide reacts with the adsorption catalyst, SO2And converted into SO3Conversion of NOx to harmless N2(ii) a The reaction product is sent into a concentrated sulfuric acid pool by a fan through a flow regulating valve to be converted into H2SO4And discharging clean gas through the fiber demister.
The desulfurization and denitrification method comprises the following steps:
a. introducing flue gas containing sulfur dioxide and nitrogen oxide from gas inlet end into adsorption-low temperature plasma reactionIn the reactor, the SO in the flue gas containing sulfur dioxide and nitrogen oxide reacts with an adsorption catalyst in the reactor2And NOx are adsorbed in the reactor, the reaction time is 600-3000 s,
b. the average energy input into the adsorption-low temperature plasma reactor is 1w/m3Flue gas is 100w/m3Plasma field of flue gas to make plasma and SO2With NOx, respectively, reacting SO2Conversion to SO3Conversion of NOx to N2The action time is 1 s-300 s,
c. part of the main stream smoke of one reactor in the adsorption-low temperature plasma reactor is introduced into the induced draft end of the other reactor from the smoke outlet of the reactor,
d. SO is generated by branch flue gas introduced from an induced draft end3Feeding into a concentrated sulfuric acid tank to make SO3Conversion to H2SO4，
e. And discharging clean gas through the fiber demister.
The plasma generators in the two parallel adsorption-low temperature plasma reactors are controlled by the energy switching device to be alternately used, namely the first reactor adsorbs SO2And in the NOx process, saturated SO is adsorbed2Carrying out plasma catalysis combined reaction with a second reactor of NOx to generate SO3And N2In which SO3Conversion to H2SO4(ii) a When the first reactor is saturated in adsorption, the second reactor is alternately used for adsorbing SO2In the process of NOx, the first reactor carries out plasma catalysis combined reaction to generate SO3And N2In which SO3Conversion to H2SO4(ii) a The above process is repeated repeatedly, and the working time of generating plasma is shorter than that of adsorbing the catalyst SO2And NOx saturation adsorption time.
The adsorption catalyst in the adsorption-low temperature plasma reactor is gamma-Al2O3And complexes of zeolite supports with metals, metal oxides.
The reaction mechanism is as follows: the plasma generated by the pulse discharge contains a large number of energetic electrons, ions, excited particles, and radicals having a strong oxidizing property, in which the average energy of the active particles is higher than the bond energy of gas molecules. The result of collisions of these active particles with harmful molecules: on the one hand, the gas molecular bond is opened to generate oneSome monoatomic molecules and solid particles; on the other hand, a large amount of OH and HO is produced2、·O、N*And the like. The chemical reaction caused by the active particles composed of these monoatomic molecules, radicals, and the like eventually changes the harmful substances in the exhaust gas into harmless substances.
SO2The mechanism of the conversion is: active particles O and OH with SO adsorbed on the solid surface2Molecules undergo a series of complex electrochemical reactions with active particles or radicals as the matrix:
the final product is H2SO4。
The mechanism of NOx conversion is:
reduction of NO to N by N2And (4) removing.
The technological process of the invention is a simulated moving bed process, and adsorption and plasma catalytic reaction are respectively andalternately carried out.
SO3Conversion to H2SO4Is connected with the reactor of the plasma catalytic process, and SO is introduced from the introduced branch flue gas3Brought into a concentrated sulfuric acid pool, the gas treatment capacity is 1% of the total flue gas (the value is the ratio of the sidestream flue gas volume to the mainstream flue gas volume), SO3Conversion to H2SO4The reactor device is small, and the difficulty of large-scale acid mist demisting is overcome.
Has the advantages that: the invention does not need any desulfurization and denitrification agent, and the generated product is an industrial raw materialFeed sulfuric acid and harmless N which can be discharged directly into the atmosphere2No waste is discharged, resources can be recycled, and the overall economic benefit is improved; saving about 50% of the power compared with a continuous plasma reactor. The invention takes low-temperature plasma technology as the main part and combines an adsorption catalyst to lead SO to be absorbed2And NOx are removed synchronously according to the ways of oxidation reaction and reduction reaction respectively, and the method has the advantages of simple equipment, low investment, small occupied area, low energy consumption, no secondary pollution, long operation period, wide application in desulfurization and denitrification of boiler flue gas of various models and the like.
Gamma-Al used in the invention2O3And zeolite supported catalysts have a large specific surface area and thus can generate a large diffusion force, and are excellent adsorbents; gamma-Al is a material which, because of its good adsorption properties and large adsorption surface area, can hold a considerable amount of adsorbed material and thus can promote chemical reactions on its surface2O3And zeolites as effective catalysts and catalytic supports; has stronger heat resistance, acid resistance and alkali resistance; has the technological properties of chemical reactivity, far infrared radiation, reversible dehydration property and the like. The most important advantage is high adsorption selectivity to various polar compounds and unsaturated compounds. gamma-Al2O3And adsorption of catalyst on zeolite carrier to SO2Has strong selective adsorption with NOx and SO on the surface of particles2And NOx is enriched, and the adsorption capacity is large. Mass adsorption rate (adsorbate SO)2Mass or NOx Mass/Gamma-Al2O3And zeolite carrier adsorption catalyst mass) respectively up to 3% -5% and above 1%.
Drawings
Fig. 1 is a schematic view of the general structure of the present invention. Wherein a flue gas inlet valve 11 is arranged; an exhaust valve 12, an induced draft inlet valve 13 and a flow regulating valve 14; an adsorption-low temperature plasma reactor 2; a main flue gas inlet end 21; an air induction end 22; a mainstream smoke outlet end 23; a reaction product outlet 24; plasma generator 25: a high-voltage pulse power supply 3; an energy switching device 4; a fan 5; a concentrated sulfuric acid tank 6; a fiber mist eliminator 7.
Fig. 2 is a sectional view of a structure a-a of the plasma generator 25 (line-cylinder type). With a center electrode 251; a tube container 252.
Fig. 3 is a plan view of the plasma generator 25 (wire-cylinder type) in structure, and a cylindrical ground 253.
Fig. 4 is a front view of the structure of the plasma generator 25 (line-plate type). With a central electrode 254; a square container 255; a plate ground256.
Fig. 5 is a sectional view of the structure B-B of the plasma generator 25 (line-plate type).
Detailed Description
γ-Al2O3And zeolite carriers have large specific surface area and thus can generate large diffusion force, and are excellent adsorbents; because the adsorption performance is good, the adsorption surface area is large, and a considerable amount of adsorbed substances can be contained, the chemical reaction can be promoted to be carried out on the surface of the adsorption material, and therefore the gamma-Al 2O3 and the zeolite are used as effective catalysts and catalytic carriers; has stronger heat resistance, acid resistance and alkali resistance; has the technological properties of chemical reactivity, far infrared radiation, reversible dehydration property and the like. The most important advantage is high adsorption selectivity to various polar compounds and unsaturated compounds.
The adsorption reaction conditions are as follows: the adsorption temperature is room temperature, the mass of the adsorbent is 10g, the gas ratio is 750ppm of NO gas and 1500ppm of SO2The rest gas is N2The flow rate was 0.85L/min. The reactor outlet NO gas concentration after 9000s of adsorption was not more than 30ppm, and SO was measured2The gas concentration of (2) is 5 ppm. The mass adsorption rate of NO reaches about 1.2 percent, and SO2The mass adsorption rate reaches about 5 percent.
Adsorption of catalyst to SO2Has strong selective adsorption with NO, and has SO on the surface of the particles2And NO is enriched, and the adsorption capacity is large.
The plasma desorption conditions were: the mass of the saturated and adsorbed desorption agent is 10g, the desorption temperature is room temperature, the input plasma energy is 20W, and the desorption agent is added into the reaction kettleAbout 200s, SO at this energy2The release amount reaches 1200ppm, the release amount of NO reaches 500ppm, and then SO2And NO is released by desorption in large quantities. Setting the input energy to 32W, SO during this period2And faster desorption of NO. The energy has direct promotion effect on the desorption of the plasma, and the energy is further improved to discover SO2And shorter NO desorption times.
The adsorption-low temperature plasma flue gas SO of the invention2The NOx synchronous removing device is formed by connecting a flue gas desulfurization and denitration reactor, a fan 5, a concentrated sulfuric acid tank 6 and a fiber demister 7 in series in sequence, wherein the flue gas desulfurization and denitration reactor is formed by connecting two identical adsorption-low temperature plasma reactors 2 in parallel; a plurality of line-cylinder (or line-plate) plasma generators 25 are arranged in the adsorption-low temperature plasma reactor, and are filled with adsorption catalysts which are gamma-Al 2O3 and compounds of zeolite carriers and metals and metal oxides; the main flue gas inlet end 21 of the adsorption-low temperature plasma reactor 2 is connected with a flue gas inlet valve 11, the main flue gas outlet end 23 is connected with an exhaust valve 12, the outlet of the exhaust valve 12 is respectively connected with the induced air end 22 of another adsorption-low temperature plasma reactor 2 and the flue of a chimney, and the outlet 24 of a reaction product is connected with a fan 5 through a flow regulating valve 14; the high-voltage pulse power supply 3 is respectively connected with the plasma generators 25 of the two adsorption-low temperature plasma reactors 2 through the energy switching device 4.
After the main stream of flue gas flows through the adsorption-low temperature plasma reactor 2, the main stream of flue gas is adjusted by a flue gas exhaust valve 12 from a main stream flue gas outlet end 23 and is directly sent into a flue to a chimney, for two adsorption-low temperature plasma reactors 2 which are connected in parallel, a certain amount of flue gas is introduced from the main stream flue gas outlet of the other side, and a certain flow is adjusted by an outer air induction end 22 of each adsorption-low temperature plasma reactor 2 through an air induction air inlet valve 13 to enter the adsorption-low temperature plasma reactor 2, so that the respectively introduced branch flue gas takes away reaction products through the adsorption-low temperature plasma reactor 2, a reaction product outlet 24 of the adsorption-low temperature plasma reactor 2 is connected with a fan 5 through a flow adjusting valve 14, and an adsorption catalyst in the adsorption-low temperature plasma reactor 22O3And zeolite support and metalOr a composite of metal oxides. For the zeolite, 5A molecular sieve and mordenite are adopted; the metal or metal oxide is Na, Fe, Mn, Zn, etc. or its oxide; γ -Al2O3 and zeolite support: the metal or metal oxide is 10: 1-100: 1.
The invention leads the flue gas (the temperature is usually 100-200 ℃) discharged from the tail part of the dust remover of the power plant into an adsorption-low temperature plasma reactor 2 through a flue gas inlet valve 11. The reactor consists of several line-cylinder (or line-plate) plasma generators, which are filled with high-efficiency adsorption catalyst. The reactor adopts an intermittent working mode, namely the reactor is designed into two main passages, the flowing time of the flue gas in one main passage is determined according to the parameters of the flue gas flow, the performance of the adsorption catalyst and the like, and when the adsorption catalyst in the passage absorbs harmful gas SO in the main flue gas2And after NOx adsorption is saturated, the smoke gas flows through the other main passage by controlling the switching of the smoke gas inlet valve 11. At the moment, the main path which passes through the flue gas and is saturated with the internal adsorption catalyst is driven by energy reaction provided by a high-voltage pulse power supply 3 (the voltage is about 30KV, and the power frequency is 1-10KHz), a low-temperature plasma field is generated in the reactor for reaction, and the reaction can be completed in a short time. Then, a certain amount of mainstream smoke is introduced from the air outlet end of the other reactor from the air inlet end outside the reactor and flows through the reactorThe reaction product is carried out of the reactor for a period of time into the next process. Meanwhile, when the time for the tail gas flow of the other main passage is up and is switched, energy can be injected into the passage in time through the energy switching device 4 to continue the operation. Thus, the two reactors are operated alternately. The product brought out by the reaction is gas containing sulfuric acid mist, the temperature of the gas is kept between 100 and 200 ℃, the gas is introduced into a concentrated sulfuric acid pool 6 through a fan 5 for washing, and the residual sulfuric acid mist after washing is removed through a fiber demister 7, so that the aim of desulfurization is fulfilled. The method can stabilize the desulfurization and denitrification efficiency to be more than 90 percent.
The adsorption-low temperature plasma flue gas SO of the invention2The synchronous desulfurization and denitrification method of the NOx synchronous removal device comprises the following steps:
a. the flue gas containing sulfur dioxide and nitrogen oxide is communicated from the main flue gas inlet end 21The SO in the flue gas containing sulfur dioxide and nitrogen oxide is put into an adsorption-low temperature plasma reactor 2 to react with an adsorption catalyst in the reactor2And NOx are adsorbed in the reactor, the reaction time is 600-3000 s,
b. the average energy consumption is 1w/m when being input into the adsorption-low temperature plasma reactor 23Flue gas is 100w/m3Plasma field of flue gas to make plasma and SO2With NOx, respectively, reacting SO2Conversion to SO3Conversion of NOx to N2The action time is 1 s-300 s,
c. part of the mainstream smoke of one of the adsorption-low temperature plasma reactors 2 is introduced from the smoke outlet 23 of this reactor into the draught end 22 of the other reactor,
d. SO is generated by branch flue gas introduced from the induced draft end 223Feeding into a concentrated sulfuric acid tank 6 to make SO3Conversion to H2SO4，
e. The clean gas is discharged through the fiber mist eliminator 7.
The plasma generators 25 in the two parallel adsorption-low temperature plasma reactors 2 are controlled by the energy switching device 4 to be alternately used, namely the first reactor adsorbs SO2And in the NOx process, saturated SO is adsorbed2Carrying out plasma catalysis combined reaction with a second reactor of NOx to generate SO3And N2，SO3Conversion to H2SO4(ii) a When the first reactor is saturated in adsorption, the second reactor is alternately used for adsorbing SO2In the process of NOx, the first reactor carries out plasma catalysis combined reaction to generate SO3And N2，SO3Conversion to H2SO4(ii) a The above process is repeated repeatedly, and the working time of generating plasma is shorter than that of adsorbing the catalyst SO2And NOx saturation adsorption time.
Claims (4)
1. An adsorption-low temperature plasma synchronous desulfurization and denitrification device is characterized by being formed by sequentially connecting a flue gas desulfurization and denitrification reactor, a fan (5), a concentrated sulfuric acid tank (6) and a fiber demister (7) in series; wherein, the flue gas desulfurization and denitration reactor is formed by connecting two same adsorption-low temperature plasma reactors (2) in parallel; a plurality of line-cylinder (or line-plate) plasma generators (25) are arranged in the adsorption-low temperature plasma reactor (2), adsorption catalysts are filled in the line-cylinder (or line-plate) plasma generators, the main flue gas inlet end (21) of the adsorption-low temperature plasma reactor (2) is connected with a flue gas inlet valve (11), the main flue gas outlet end (23) is connected with an exhaust valve (12), the outlet of the exhaust valve (12) is respectively connected with the induced air end (22) of another adsorption-low temperature plasma reactor (2) and the flue of a chimney, and the outlet (24) of a reaction product is connected with a fan (5) through a flow regulating valve (14); the high-voltage pulse power supply (3) is respectively connected with the plasma generators (25) of the two adsorption-low temperature plasma reactors (2) through the energy switching device (4).
2. The simultaneous adsorption-low temperature plasma desulfurization and denitrification apparatus as claimed in claim 1, wherein the adsorption catalyst in the adsorption-low temperature plasma reactor (2) has the function of adsorbing SO simultaneously2And NOx, which is gamma-Al2O3And a zeolite carrier and a metaloxide compound supporting metal ions such as Na, Fe, Mn, Zn, etc.
3. A method for implementing the adsorption-low temperature plasma synchronous desulfurization and denitrification device of claim 1, wherein the synchronous desulfurization and denitrification method comprises the following steps:
a. for the adsorbed SO of claim 22And NOx, the compound of the metal oxide absorbs sulfur dioxide and nitrogen oxide in the flue gas to saturation,
b. the average energy input into the adsorption-low temperature plasma reactor is 1w/m3Flue gas is 100w/m3The plasma field of the flue gas adsorbs the catalyst to generate SO2And NOx desorption and catalytic reaction to respectively remove SO2Conversion to SO3Conversion of NOx to N2Namely the characteristics of plasma desorption and catalytic synchronous reaction,
c. part of the main stream smoke of one reactor in the adsorption-low temperature plasma reactor is introduced into the induced draft end of the other reactor from the smoke outlet of the reactor,
d. SO is generated by branch flue gas introduced from an induced draft end3Feeding into a concentrated sulfuric acid tank to make SO3Conversion to H2SO4，
e. And discharging clean gas through the fiber demister.
4. The method of claim 3, wherein two or more parallel adsorption-low temperature plasma reactors are alternately used by switching the adsorption-desorption catalysis.
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