189 results about "Catalytic method" patented technology

The invention relates to the technical field of friction catalytic degradation of pollutants, in particular to application of nano bismuth ferrite in friction catalytic degradation of high-concentration methyl orange dyestuff, and a specific catalysis method comprises the following steps: S1, pouring a methyl orange solution into a container, and adding bismuth ferrite nano powder into the methyl orange solution; s2, adding a friction turntable into the container, wherein the bottom surface of the friction turntable is in contact with the bottom surface of the container; s3, enabling the friction turntable to rotate through external force, and completing catalytic degradation of methyl orange by the bismuth ferrite nano powder. According to the method, methyl orange is degraded in a friction catalysis manner, so that the degradation efficiency is greatly improved, and further exploration of a friction catalyst is promoted.

The invention discloses a catalyst for preparing trichlorosilane and a catalytic preparation method of trichlorosilane. The catalyst is prepared from the following components in percentage by mass: weighed copper nitrate, zinc nitrate, aluminum nitrate, lanthanum nitrate and the balance of a carrier, the preparation method comprises the following specific steps: S1, filling a catalyst; S2, purifying raw material gas; S3, reacting; and S4, separating and purifying a product, namely discharging a reacted gas product from an outlet of a reactor, and condensing through a condenser. In the prepared catalyst, the activity and selectivity of the catalyst are remarkably improved through the synergistic effect of the copper-zinc-aluminum composite oxide and the rare earth element lanthanum, the electronic structure and the surface acid-base property of the catalyst can be adjusted through doping of lanthanum, the reaction of silicon powder and hydrogen chloride is promoted, meanwhile, side reactions are inhibited, and the service life of the catalyst is prolonged. And the yield of trichlorosilane is improved.

The invention discloses a method and equipment for dephosphorizing and desulfurizing yellow phosphorus tail gas, aiming at solving the technical problem of efficiently removing phosphorus-containing pollutants and sulfur-containing pollutants in the yellow phosphorus tail gas. Comprising the following steps: introducing yellow phosphorus tail gas into a dephosphorization device to remove phosphorus-containing substances in the yellow phosphorus tail gas, wherein the dephosphorization device adopts a first catalytic flue gas treatment device; introducing the dephosphorized flue gas into an organic sulfur hydrolysis conversion device to convert organic sulfur in the dephosphorized flue gas into H2S, wherein the organic sulfur hydrolysis conversion device adopts a second catalytic flue gas treatment device; and introducing the organic sulfur hydrolysis conversion flue gas into a desulfurization device to remove H2S in the organic sulfur hydrolysis conversion flue gas, wherein the desulfurization device adopts a third catalytic flue gas treatment device. The efficient continuous treatment of phosphorus-containing pollutants and sulfur-containing pollutants in the yellow phosphorus tail gas can be realized.

The invention discloses a catalytic method for converting alpha-olefin in an alkane-olefin mixture into internal olefin and application, raw materials and a solid acid catalyst are carried out in a fixed bed or a reaction kettle, the reaction temperature is 50-150 DEG C, the reaction pressure is 15-400 psi, and the reaction environment is an inert gas atmosphere; when the reaction is carried out on the fixed bed, the mass space velocity of the solid acid catalyst is 1h <-1 >-20h <-1 >; when the reaction is carried out in the reaction kettle, the conversion frequency of the raw materials is 5000 mol substrate mol acid site density <-1 > h <-1 > to 50000 mol substrate mol acid site density <-1 > h <-1 >; wherein the raw material is an alkane-alkene mixture; the solid acid catalyst comprises an active component and a carrier, wherein the carrier contains at least one inorganic oxide; the active component has a structure as shown in a formula (1) and / or a formula (2), in the formula (1) and the formula (2), R is alkyl or phenyl, and n is greater than or equal to 1. According to the catalysis method provided by the invention, the conversion rate of alpha-olefin can be increased, and the proportion of skeleton isomerization products and oligomers in internal olefin products can be reduced.

The invention relates to preparation of a cefazolin compound, in particular to a preparation method of a cefazolin acid three-position intermediate TDA. The preparation method comprises the following steps: carrying out condensation reaction on 7-ACA and MMTD serving as raw materials, dimethyl carbonate serving as a solvent and a boron trifluoride dimethyl carbonate complex and glacial acetic acid serving as catalysts to obtain condensation reaction liquid; adding EDTA (Ethylene Diamine Tetraacetic Acid) and sodium pyrosulfite into water, carrying out stirring reaction, transferring the condensation reaction liquid into water, and continuously carrying out heat-preservation stirring, so as to obtain a hydrolysis reaction liquid; and adding a sodium carbonate solution into the hydrolysis reaction solution while stirring, adjusting the pH value, growing crystals, and then performing suction filtration, washing and drying to obtain a finished product. A boron trifluoride dimethyl carbonate complex-glacial acetic acid catalysis method is adopted, the product quality and yield are guaranteed in industrial production, meanwhile, the reagent usage amount and the waste liquid generation amount are reduced, the production cost and the environment pressure are reduced, normal reaction is maintained at normal pressure, and the reaction is prevented from being too severe.

The invention belongs to the technical field of catalytic methods and catalysts, and particularly relates to a method for preparing a polysubstituted allene carboxylic acid methyl ester compound based on CO2 and photocatalysis, which is based on a photocatalytic reaction system, takes CO2 as a carboxyl source, and is prepared through a 1, 3-enyne 1, 3-polysubstituted allene carboxylic acid methyl ester compound under the mild conditions of no photocatalyst and metal, so that the polysubstituted allene carboxylic acid methyl ester compound is obtained. According to the present invention, the efficient synthesis of the polysubstituted allene carboxylic acid derivative is achieved through the 1, 4-alkane carboxylation reaction, the method has advantages of good yield, wide substrate universality, suitableness for the reaction of a variety of functional groups, non-toxicity of the used reagent, and wide application prospect.

The present invention belongs to the technical field of single-walled carbon nanotube preparation, and particularly relates to a device for preparing single-walled carbon nanotubes by a floating catalyst method, comprising: a reaction mechanism including a reaction furnace tube and a first heating mechanism for heating the reaction furnace tube; a first raw material conveying mechanism including a sublimation tank for storing a catalyst and a second heating mechanism for heating the sublimation tank, the sublimation tank being communicated with the reaction furnace tube through a first conveying path, wherein the catalyst in the sublimation tank is sublimated and forms a gas state by heating the sublimation tank through the second heating mechanism; a second raw material conveying mechanism including an injection pump for storing a liquid carbon source and a gas cylinder for storing a gas, the injection pump and the gas cylinder being communicated with the reaction furnace tube through a second conveying path; and a collection mechanism including a collection assembly communicated with the reaction furnace tube. The device of the present invention can improve the yield of single-walled carbon nanotubes and the stability of the preparation process.

The invention discloses a catalytic flue gas treatment device and a yellow phosphorus tail gas purification system. The technical problem that the working efficiency of a catalytic flue gas treatment device is affected due to the fact that a catalyst in the catalytic flue gas treatment device needs to stand and dry for a long time after being washed and regenerated is solved. Comprising a reaction system, a regenerated liquid circulating system and a flue gas conveying system, the system further comprises a drying system, the drying system comprises a first air blower, a heater and a drying gas distribution pipe network, and the first air blower and the heater are connected with all the reactors through the drying gas distribution pipe network. Therefore, airflow generated by the first air blower is heated by the heater to form dried gas, and the dried gas enters the reactor after washing and regeneration of the catalyst and passes through the catalyst in the reactor. When the drying gas passes through the catalyst, the regeneration liquid attached to the catalyst is evaporated and discharged out of the catalyst along with the flowing of the drying gas to wash the regenerated reactor. And the drying time of the catalyst is shortened.

This invention discloses a solution-based synergistic catalytic method for preparing post-functionalized polyolefins, belonging to the field of polymer material modification technology. The method includes the following preparation steps: adding polyolefin, graft monomer, and catalyst to an organic solvent, stirring until homogeneous, and heating to react, thereby obtaining the post-functionalized polyolefin; wherein the catalyst is a combination of a first catalyst and a second catalyst; and the first catalyst is selected from tert-butyl nitrite, and the second catalyst is selected from N-hydroxysuccinimide and / or N-hydroxyphthalimide. This invention utilizes a synergistic catalytic system composed of tert-butyl nitrite and N-hydroxysuccinimide and / or N-hydroxyphthalimide to activate the C-H bonds of polyolefins in an organic solvent via a free radical mechanism, thereby grafting polar functionalized graft monomers onto the main chain of various polyolefins.

A photoelectric fluid field cluster catalytic method for atomic-scale deterministic processing, comprises the following steps: selecting nanoparticles with photocatalytic activity as a photocatalytic medium, and using a photoreduction method to realize the precipitation of metal nanoparticles on a surface of the photocatalytic medium, thus creating photoelectrocatalytic clusters; illuminating a coupling area between a surface to be processed of a workpiece, the photoelectrocatalytic clusters and a flexible tool with a catalytic light source, and simultaneously applying a bias voltage to a conductive tray of the workpiece; and applying a normal load to a flexible tool head and setting a rotation speed to generate a hydrodynamic pressure to drive a polishing solution to flow, thus enabling controllable removal with atomic-level precision. The disclosure utilizes the metal particles in the photoelectrocatalytic clusters to capture photogenerated electrons, thereby prolonging the lifetime of photogenerated carriers.

The present invention relates to a method and device for purifying and storing industrial crude hydrogen based on catalytic hydrogenation of gamma-butyrolactone, wherein the purification and storage method comprises: 2 The crude hydrogen is introduced into γ-butyrolactone for catalytic reaction, so that the hydrogen is stored in the molecules of 1,4-butanediol, realizing one-step separation and purification of crude hydrogen and catalytic hydrogen storage. Compared with the prior art, the present invention can realize one-step separation and purification of crude hydrogen and catalytic hydrogen storage, and can avoid CO and CO 2 The reaction temperature of side reactions such as hydrogenation to synthesize methanol is reduced, thereby obtaining high hydrogen storage efficiency and selectivity; when hydrogen is needed, high-purity hydrogen can be removed from 1,4-butanediol by a catalytic method; compared with traditional multi-step crude hydrogen purification methods such as water vapor shift-pressure swing adsorption-chemical absorption, the process reported in the present invention is short, efficient and low-cost.

The utility model discloses an ammonia-ammonium chloride catalysis system for decarburization of steel slag solid waste and flue gas, and belongs to the technical field of ferrous metallurgy. The ammonia-ammonium chloride catalysis system for steel slag solid waste and flue gas decarburization comprises a steel slag dissolving tank, an ammonia gas condensation cooler and a decarburization tower which are sequentially connected, the top of the decarburization tower is sequentially connected with an ammonia recovery system, an impurity filtering system and a calcium carbonate extraction system, and the bottom of the decarburization tower is connected with the calcium carbonate extraction system. The calcium carbonate extraction system is connected with the steel slag dissolving tank, and the steel slag dissolving tank is communicated with the ammonia recovery system. According to the technical scheme, the purpose of carbon capture and high-added-value resource reutilization of the steel slag are achieved.

The application discloses a kind of ruthenium grafting manganese aluminum hydrotalcite and catalytic method for C02 hydrogenation preparation formic acid, belong to catalyst technical field, in the application, under the optimized reaction condition, with methanol:water mixture as solvent (5:1), total pressure is 60bar, 60 DEG C, reaction 24 hours, with temperature controller to be heated to the temperature required for reactor.When the temperature inside the reactor reaches the specified temperature, start stirring at a fixed stirring speed (200-800 revolutions / min), after the required reaction time, stop stirring and heating, and allow the reactor to cool to room temperature. The hydrogenation products were analyzed by high performance liquid chromatography, the conversion number (TON) of formic acid reached more than 8000; RuMnAl-LDH was prepared by coprecipitation method, and RuMnAl hydrotalcite catalyst was obtained by heating and activation in a muffle furnace. The preparation process is simple, and the raw materials are easy to obtain. The RuMnAl-LDH catalyst prepared by the application has good catalytic activity and stability in the catalytic hydrogenation of formic acid to formic acid reaction, and has wide application prospect.

The application belongs to the field of catalytic synthesis of fine chemical products, and particularly relates to an ionic compound and a method for catalytically synthesizing cyclic carbonate. The application provides an ionic compound, which comprises an anion as shown in formula (I) or formula (II); wherein X is selected from O, S and Se, and the value of L is 0 or 1; the anion in the ionic compound has suitable nucleophilicity and leaving property, can be combined with other active positive ions or metal ions to form a catalytic system with good solubility, and is particularly suitable for being used in a cycloaddition reaction involving carbon dioxide. Meanwhile, the application further provides a catalytic method for synthesizing cyclic carbonate, which uses a catalytic system containing the ionic compound, so that cyclic carbonate can be synthesized in a solvent-free, low-halogen or halogen-free, low-catalyst-amount and mild reaction condition mode with high efficiency, high conversion rate and high chemical selectivity.

The application relates to a method for efficient utilization of solid waste, in particular to a catalytic method for polyolefin waste. The application provides a preparation method of a catalyst for catalyzing polyolefin waste, which comprises the following steps: 1) mixing an acid molecular sieve and an active metal precursor, and roasting to obtain a catalyst precursor; and 2) reducing the catalyst precursor by a reducing agent to obtain the catalyst. In the application, the acid molecular sieve is used as a carrier, solid ion exchange is carried out through high-temperature roasting, the active metal component is solidified in the molecular sieve channel structure, the reduced catalyst has rich acid sites, defect sites and high-dispersed active metals, and in combination with the shape selection and confinement of the molecular sieve structure, efficient conversion of the polyolefin waste into naphtha can be realized.

Production of HFO-1132 and, in particular, HFO-1132E, may be produced from 1,1,2-trichloro-1,2,2-trifluoroethane (CFC-113) or CTFE. The present disclosure provides a non-catalytic method for producing trans-1,2-difluoroethylene (HFO-1132(E)), comprising: providing a reactant composition comprising cis-1,2-difluoroethylene (HFO-1132(Z)); and isomerizing the HFO-1132(Z) in an electric heater reactor or a tubular reactor at a temperature of from about 350°C to about 600°C to produce a product composition comprising HFO-1132(E).

The invention relates to catalytically active heating elements, to the production thereof and to the use thereof in the production of hydrocyanic acid (HCN). The problem addressed by the invention is that of providing a thermally stable and catalytically active heating element with which it is possible to simultaneously electrically heat and chemically catalytically BMA processes. In particular, the heating element should be thermally and mechanically stable and maintain its catalytic activity in continuous industrial operations. The heating element according to the present invention has a layered structure (A, B, C) formed of (A) silicon carbide (SiC), (B) aluminum nitride (AlN), and (C) platinum (Pt). Silicon carbide (SiC) acts as an electrical heating resistor. Platinum (Pt) acts as a catalyst. Aluminum nitride (AlN) is arranged as a protective layer between platinum (Pt) and silicon carbide (SiC). Platinum (Pt) and silicon carbide (SiC) are prevented from alloying during the proceeding operation.

This invention provides a 7β-HSDH enzyme mutant, its encoding gene, and its applications. Through artificial mutation screening, 7α-HSDH and 7β-HSDH enzyme mutants with specific amino acid sequences were identified, resulting in improved enzyme activity and catalytic efficiency compared to wild-type 7α-HSDH and wild-type 7β-HSDH. This invention also provides a method for preparing ursodeoxycholic acid using the aforementioned 7α-HSDH and 7β-HSDH enzyme mutants, specifically using NADP... + A one-pot catalytic method for the conversion of chenodeoxycholic acid to ursodeoxycholic acid using NADPH-dependent 7α-HSDH enzyme mutants and NADPH-dependent 7β-HSDH enzyme mutants is employed. This method is simple, yields high product conversion, and can also achieve the conversion of the coenzyme NADP. + / NADPH's self-circulating regeneration eliminates the need for auxiliary enzymes and raw materials used in coenzyme regeneration, greatly reducing production costs and environmental pressure, and possessing enormous potential for industrial applications.

The invention relates to the technical field of sewage treatment, and particularly discloses a sewage treatment system based on an electro-catalysis method, which is used for solving the problem of poor cleaning effect in the prior art. Comprising a sewage treatment box, a plurality of supporting legs are arranged at the lower end of the sewage treatment box, a sewage inlet pipe used for feeding sewage is arranged on the sewage treatment box, an electrolysis module used for electrolyzing the sewage is arranged in the sewage treatment box, and the sewage can be purified through the electrolysis module; the drainage end of the circulating pump is communicated with the sewage treatment tank, the water inlet end of the circulating pump is communicated with the other end of the sewage treatment tank through a circulating pipeline, and a buffer outer tank is arranged at the water outlet of the sewage treatment tank. According to the present invention, the design is performed according to the existing needs, the circulation structure can be constructed in the sewage treatment tank, the sewage electrolysis is matched, the floating impurities in the sewage are removed through filtration, the influence of the liquid level is avoided, and the sewage purification effect is ensured.

The invention provides a photo-catalytic treatment reactor and a photo-catalytic method for photosensitive dry film developing waste liquid, the reactor comprises: an outer cylinder, an inner cylinder is arranged in the outer cylinder, the outer cylinder and the inner cylinder form an interlayer for storing waste liquid, the outer cylinder is a closed structure, and a liquid inlet pipeline is arranged on the outer cylinder; the inner cylinder is used for introducing the waste liquid in the interlayer in batches, a photocatalyst is arranged on the inner wall of the inner cylinder, an opening and closing door is mounted on the upper end face of the inner cylinder, and a liquid outlet pipeline is arranged on the lower end face of the inner cylinder, penetrates through the lower end face of the outer cylinder downwards and extends out of the outer cylinder; the opening and closing door is rotationally connected with the inner barrel and connected with a driving part on the inner wall of the outer barrel, and when the opening and closing door is closed, the inner barrel can be closed; a stirring part and a light source are arranged on the rotating shaft, the rotating shaft is connected with the output end of the power part, and the rotating shaft downwards penetrates through the upper end face of the outer cylinder from the outside of the outer cylinder and extends into the inner cylinder. The photocatalytic reaction efficiency is improved.

The invention relates to the technical field of flow batteries, and particularly discloses a catalytic system and a catalytic method of a flow battery. The catalytic system comprises an electric pile unit used for realizing conversion between electric energy and chemical energy; the electrolyte storage unit is used for storing electrolyte and comprises a positive electrode electrolyte storage unit and a negative electrode electrolyte storage unit, and functional particles are arranged in the positive electrode electrolyte storage unit and / or the negative electrode electrolyte storage unit; the ultrasonic unit is used for promoting the functional particles to be in contact with the positive electrode electrolyte and / or the negative electrode electrolyte for electrification to generate an electrostatic field; and the circulating unit is used for realizing circulation of the electrolyte between the electrolyte storage unit and the electric pile unit. According to the flow battery catalytic system, the electron transfer process can be optimized, and the problems of slow reaction kinetics and noble metal dependence of the flow battery are solved.

A catalytic method for progressive copper sulfide ore transformation is achieved by separating stages of low-flow rate irrigation with reactive liquid mixtures having a high ORP and predetermined compositions prior to leaching. The "dynamic oxidation" stages are conducted in a sequence to reach a specified ratio of dissolved copper to undissolved ore, so that the ore may be more effectively leached in a subsequent leaching stage.

The invention relates to a catalytic method for increasing the content of synthesis gas in biomass carbon dioxide gasification products. The method comprises the following steps: independently dissolving transition metal salt, alkali metal salt or alkaline earth metal salt in water, or jointly dissolving the transition metal salt and at least one of the alkali metal salt or the alkaline earth metal salt in water to form a metal salt solution; biomass powder is added into the metal salt solution for first stirring, a mixed solution obtained after first stirring is subjected to first dipping, first standing and first drying, and a metal-doped autocatalytic biomass raw material is obtained; aluminum oxide powder is added into the metal salt solution for second stirring, the mixed solution subjected to second stirring is subjected to second dipping, second standing, second drying and roasting, and the metal-loaded aluminum oxide catalyst is obtained; and by taking carbon dioxide as a gasifying agent, enabling the autocatalytic biomass raw material and the metal-loaded aluminum oxide catalyst to exist at the same time under the condition of 700-1000 DEG C, and carrying out gasification reaction to obtain a product of which the integral number of synthetic gas is greater than 85%.

The present invention provides a catalyst comprising an iron species, manganese or an oxide thereof, cobalt or an oxide thereof, an alkali metal, and optionally at least one selected from the group consisting of zinc and copper, a process for preparing the catalyst, and a process for hydrogenating carbon dioxide and / or carbon monoxide to produce hydrocarbons using the catalyst.

This invention relates to the field of CO2 catalytic hydrogenation to methanol technology, specifically to a two-step catalytic method for methanol production using non-equilibrium plasma synergy. Conventional non-equilibrium plasma catalytic hydrogenation to methanol methods suffer from low CO2 conversion and methanol space-time yield, rarely reaching 80%. To address these issues, this invention provides a two-step catalytic method for methanol production using non-equilibrium plasma synergy. By employing stepwise reactions, optimizing catalyst composition, and refining the catalyst loading sequence in a dielectric barrier discharge catalytic reactor, this method significantly improves CO2 conversion and methanol selectivity in the non-equilibrium plasma synergistic two-step catalytic methanol production reaction, achieving remarkable technical benefits.

The present application relates to a kind of synthetic hydroxytyrosol multi-enzyme catalytic method.The synthetic hydroxytyrosol multi-enzyme catalytic method described in the present application includes first module reaction, second module reaction, third module reaction in turn;The first module reaction is that glycerol is synthesized pyruvic acid by catalysis, wherein the concentration of the glycerol is 1-5mM;The second module reaction is that pyruvic acid is condensed with catechol and ammonium chloride to be L-levodopa by catalysis;Wherein, the concentration of the catechol is 1-5mM, and the concentration of the catechol is greater than the concentration of the glycerol in the first module reaction;The third module reaction is that L-levodopa is synthesized hydroxytyrosol by catalysis.The synthetic hydroxytyrosol multi-enzyme catalytic method described in the present application, reaction 4 hours hydroxytyrosol molar conversion rate can reach 71.5%, compared with one-pot method has obvious advantage, in the same reaction time molar conversion rate is compared with one-pot method and increased nearly 6 times.

The application discloses a catalytic flue gas treatment device and a yellow phosphorus tail gas purification system, and aims to solve the technical problem of reducing the hidden danger of oxygen supplement to the flue gas to be treated during the operation of the catalytic flue gas treatment device. The device comprises a reaction system, a regeneration liquid circulation system and a flue gas conveying system, and further comprises an oxygen supplement system. The oxygen supplement system comprises a second air blower, an airflow adjusting device and an oxygen supplement gas distribution pipe network. The second air blower and the airflow adjusting device are connected with each reactor through the oxygen supplement gas distribution pipe network, so that the airflow generated by the second air blower is adjusted in flow by the airflow adjusting device, and then forms the oxygen supplement gas and enters the flue gas to be treated in the corresponding reactor. The oxygen concentration in the oxygen supplement gas is greater than that in the flue gas to be treated before the mixed oxygen supplement gas. The safety hidden danger possibly caused by the external mixing of the oxygen supplement in the reactor is avoided.

The application relates to an array type magnetic driving continuous flow system and a catalytic method. The array type magnetic driving continuous flow system comprises at least one reactor unit, and the reactor unit comprises: an upper cover plate and a lower cover plate which are oppositely arranged; a reactor main channel which is arranged between the upper cover plate and the lower cover plate; a solid particle fixing cavity which is arranged in the reactor main channel; magnetic nano particles which are arranged in the solid particle fixing cavity; and a magnetic driving array which comprises at least one group of regularly arranged permanent magnets, the group of permanent magnets are respectively fixed on the upper cover plate and / or the lower cover plate, and can generate a magnetic field which acts on the magnetic nano particles, so that the magnetic nano particles are reversibly fixed in the solid particle fixing cavity. The application effectively solves the problems of the magnetic catalyst in the continuous flow system, such as fixing, mass transfer, flux and recovery, and provides a continuous flow catalytic solution which is efficient, flexible and easy to enlarge.

The present invention relates to systems and methods for catalytic removal of oxidized contaminants (for example, nitrite, chromate, chlorate, trichloroethene, CFC-11, 4-nonylphenol, RDX, and perfluorooctanoate) from water and wastewater. In some aspects, the catalytic method of removing oxidized contaminants comprises using precious metal nanoparticles as catalysts to reduce the oxidized contaminants.

The invention discloses an improved flue gas desulfurization and denitrification system. The technical problem that the denitrification efficiency is reduced due to the influence of water vapor in flue gas to be denitrified on a denitrification catalyst is solved. Comprising a catalytic flue gas desulfurization device and an SCR denitration device, the catalytic flue gas desulfurization device comprises a desulfurization reactor, the SCR denitration device comprises an SCR denitration reactor, an activated carbon-based denitration catalyst is adopted as a denitration catalyst, and the working temperature of the activated carbon-based denitration catalyst is 120-200 DEG C; a desulfurized flue gas exhaust port of the desulfurization reactor is connected with a to-be-denitrated flue gas inlet of the SCR denitration reactor through a flue gas dehumidification device, and the flue gas dehumidification device is used for reducing the content of water vapor in flue gas entering the to-be-denitrated flue gas inlet. The influence of water vapor on the activated carbon-based denitration catalyst (for example, the pore structure becomes loose) is avoided, and the sufficient contact degree of nitrogen oxide and the denitration catalyst is ensured, so that the relatively high denitration efficiency is maintained.