26results about How to "Improve denitrification performance" patented technology

The invention relates to the technical field of flue gas treatment, in particular to an anti-blocking spraying device for SNCR (selective non-catalytic reduction) denitration treatment of waste incineration flue gas, which comprises an incinerator, a smoke exhaust channel is arranged at the upper end of the incinerator, a flow dividing assembly is arranged in the smoke exhaust channel, the flow dividing assembly comprises a spraying mechanism and a rotational flow mechanism, and the spraying mechanism comprises a flow dividing block, a flow dividing hole and a spray head. The flow dividing block is installed in the smoke discharging channel, the multiple flow dividing holes are formed in the upper end of the flow dividing block, the pair of rotating frames are installed in the flow dividing holes, the spraying pipe is rotationally connected into the rotating frames, and the multiple spraying heads are all installed on the spraying pipe; the cyclone mechanism comprises flow guide discs and cyclone blades, the flow guide discs are all installed on the circumferential face of the spraying pipe, and the cyclone blades are installed at the lower ends of the flow guide discs. Flue gas is divided, the size of each flue gas is reduced, after the flue gas passes through a water curtain formed by three layers of reaction liquid, the flue gas can make full contact with the reaction liquid, and therefore the reaction liquid can be fully separated, and the reaction effect is improved. The denitration effect on the flue gas is improved.

The utility model discloses a circulating fluidized bed boiler furnace outlet horizontal flue ash removal device which comprises a furnace, a horizontal flue, a cyclone separator, a high-temperature superheater, a low-temperature superheater, a coal economizer and an ash removal device, one end of the ash removal device is arranged at the bottom of the horizontal flue, and the other end of the ash removal device is arranged at the lower end of the coal economizer. The ash removal device comprises a primary air pre-heater, a conveying air pipe, a conveying air branch pipe and an ash removal module, and the ash removal module is arranged at the bottom in the horizontal flue and comprises a main air pipe, a branch air pipe, a connecting rod and a small air cap. A small part of primary air is led to the bottom of the horizontal flue at the hearth outlet through the bypass pipeline of the primary air pre-heater and enters the ash removal device, accumulated ash accumulated at the horizontal flue at the hearth outlet is loosened and fluidized through the small air cap and then enters the cyclone separator along with flue gas, and therefore the purpose of removing the accumulated ash in the horizontal flue at the hearth outlet is achieved. After accumulated ash is cleaned, the smoke flow speed of a hearth outlet is reduced, and the efficiency of the boiler is improved.

The invention provides a ceramic filter tube as well as a preparation method and application thereof. The ceramic filter tube comprises a foamed nickel supporting framework; the ceramic filter tube base bodies are integrally formed on the surfaces of the two sides of the foamed nickel supporting framework; the catalyst is loaded in a pore channel of the ceramic filter tube matrix and loaded in the foamed nickel supporting framework. According to the ceramic filter tube provided by the invention, the foamed nickel supporting framework is used as a reinforcing structure of the ceramic filter tube, and the ceramic filter tube base body is integrally formed on the surfaces of the two sides of the foamed nickel supporting framework, so that the problem of incompatibility caused by material difference of an existing reinforcing structure is fundamentally solved; the problem of pipe breakage caused by separation and falling of the reinforcing structure and the ceramic filter pipe is avoided, the possibility of pipe breakage of the ceramic filter pipe in the high-temperature flue gas use process is reduced, the anti-seismic property of the ceramic filter pipe is improved, and the service life of the ceramic filter pipe is prolonged; the catalytic performance of the catalyst is also improved.

The invention discloses an ammonia gas nozzle and a denitration device.The ammonia gas nozzle comprises a body and a guide part, the body is provided with a spraying cavity extending in the axial direction of the body, one end of the spraying cavity communicates with a spraying pipe, the other end of the spraying cavity is a spraying opening, the guide part is located on the outer side of the spraying opening, and the front end of the guide part is connected with the body; the orthographic projection of the front end of the guide piece on the first plane is located on the inner side of the jet orifice, at least part of the peripheral edge of the orthographic projection of the tail end of the guide piece on the first plane is located on the outer side of the jet orifice, and the first plane is the plane where the jet orifice is located. The ammonia gas nozzle can spray ammonia gas in a larger range, the mixing ratio of the ammonia gas and flue gas is increased, ammonia escape is reduced, the chemical reaction speed is increased, and then the denitration effect is improved.

The utility model relates to the technical field of flue gas denitration devices, in particular to a glass kiln flue gas denitration device which comprises a spraying box and a dust removal box, the spraying box and the dust removal box are fixedly connected through a connecting pipe, a gas inlet pipe is fixedly installed on the side face of the dust removal box, a filter is inserted in the dust removal box, and a gas outlet pipe is fixedly installed in the dust removal box. And a sealing plate is fixedly mounted at the top end of the filter. According to the flue gas denitration device, the dedusting box can perform dedusting pretreatment on flue gas, dust is prevented from entering the spraying box to cause accumulation, the liquid inlet pipe conveys denitration liquid into the spraying box, the spraying head is located over the fan blades to evenly spray the liquid, and flue gas flows to drive the fan blades on the rotating rod to rotate; the circumferential distribution of the fan blades and the position aligned with the air inlet are beneficial for increasing the contact between flue gas and spraying liquid and promoting the denitration effect, meanwhile, the fan blades drive the rotating rod to rotate, the rotating rod drives the fan blades on the connecting plate to rotate, and denitration liquid can be scattered through the fan blades, so that gas-liquid mixing is enhanced, and the denitration effect is improved.

The utility model discloses flue gas denitration equipment capable of adjusting flow, and belongs to the field of flue gas denitration. The flue gas denitration equipment capable of adjusting the flow comprises an outer shell, an extension shell is arranged on one side of the lower end of the outer shell, a pump used for pumping liquid is arranged on one side of the extension shell, a second flow dividing pipe is transversely arranged at the upper end of the interior of the outer shell, and a second flow dividing pipe is arranged at the lower end of the second flow dividing pipe. A second nozzle is transversely arranged at the lower end, facing the interior of the shell, of the second flow dividing pipe. The boiler flue gas denitration device solves the problem that when existing boiler flue gas denitration equipment sprays denitration liquid, different water flows at different positions in the device are relatively fixed, and the recycling of the liquid and the denitration effect are affected. The liquid is conveyed into the second flow dividing pipe and the first flow dividing pipe and then sprayed out through the second spray head and the first spray head at the same time after being conveyed, and the liquid makes full contact with smoke conveyed in the device.

The denitration and dust removal integrated biomass grate boiler comprises a second flue, a third flue and a fourth flue which are sequentially connected with an outlet of a hearth, the lower end of the second flue is communicated with the lower end of the third flue, and the upper end of the third flue is connected with the upper end of the fourth flue through a furnace top turning flue. A first platen superheater is arranged at the upper part of the hearth, a second platen superheater is arranged in the second flue, a coiled pipe superheater is arranged in the third flue, and denitration equipment, an economizer and a tail heating surface are sequentially arranged in the fourth flue according to the flowing direction of flue gas; dust removal equipment is arranged in the furnace top turning flue, and the dust removal equipment and denitration equipment are supported on a boiler body steel frame. The dust removal equipment and the denitration equipment are also arranged in the range of the boiler body, so that compared with the prior art, the lengths of the inlet flue and the outlet flue are greatly shortened, the heat dissipation loss is reduced, the boiler efficiency is improved, and the dust removal and denitration effects can be improved; and the floor area is small, and the construction cost is low.

The present invention relates to the technical field of catalyst preparation, and specifically to a preparation method and application of an ultra-low temperature denitration catalyst. The preparation method of the ultra-low temperature denitration catalyst comprises the following steps: (1) adding a molybdenum salt and a complexing agent to pure water, heating and stirring, dissolving the molybdenum salt completely, obtaining a molybdenum complex solution, and then roasting to obtain modified molybdenum oxide; (2) adding a vanadium salt and a complexing agent to pure water, heating and stirring, dissolving the vanadium salt completely, cooling, and obtaining a vanadium complex solution; (3) adding titanium dioxide and modified molybdenum oxide to the vanadium complex solution, stirring evenly, drying, and roasting to obtain an ultra-low temperature denitration catalyst. The present invention improves the denitration performance of the denitration catalyst at ultra-low temperatures, while reducing SO 2 / SO 3 Conversion rate.

The utility model relates to the technical field of flue gas treatment, in particular to a coking flue gas denitration device, and aims to solve the technical problems that in the prior art, flue gas is sprayed from the upper part to the lower part, the flue gas and an absorbent are not completely reacted and then are exhausted, and the denitration effect is poor. A long hole is formed in the partition plate on one side of the gap, a plurality of spray heads are evenly distributed on the surfaces of the partition plates on the upper side and the lower side of the long hole, each long hole is communicated with a liquid inlet pipe through a corresponding branch pipe, the top wall of the treatment chamber is communicated with an exhaust pipe, waste gas is injected through the lower portion of the treatment chamber, and the flue gas advancing path is prolonged through the partition plates arranged in a staggered mode. A plurality of nozzles are arranged at the upper part and the lower part of the partition plate for spraying to form a plurality of dead-angle-free liquid curtains, flue gas fully reacts with an absorbent through the plurality of liquid curtains, and the absorbent covers the upper surface of the partition plate and downwards flows, so that the contact area between the absorbent and the flue gas is increased, and the denitration effect is greatly improved.

The utility model discloses a boiler denitration agent feeding mechanism, which belongs to the technical field of flue gas denitration, and adopts the technical scheme that the boiler denitration agent feeding mechanism comprises a denitration tower, a controller is arranged on the front side of the surface of the denitration tower, a rotating assembly is arranged in the denitration tower, and the rotating assembly comprises a first bevel gear; a feeding assembly is fixedly connected to the interior of the first bevel gear, and by arranging the feeding assembly, a medicament sprayed from an atomizing nozzle can be annularly and uniformly distributed in the denitration tower, and the uniformly sprayed medicament can be in full contact with nitrogen oxide in flue gas, so that the condition that the concentration of the medicament in a local area is too low or too high is avoided; according to the denitration tower, the rotating assembly is arranged, so that the medicament sprayed from the atomizing spray head can be uniformly sprayed in the denitration tower in a 360-degree annular manner, the medicament can uniformly cover the internal space of the denitration tower, nitrogen oxides at all positions in the denitration tower can be fully contacted with the medicament and react with the medicament, and the denitration effect is further improved.

The invention is applicable to the technical field of flue gas treatment, and provides a denitration system for a 100MW-grade combined cycle unit, which comprises a mixed conveying part connected with a smoke exhaust pipe of the combined cycle unit, a plurality of denitration assemblies are uniformly and fixedly mounted on the mixing and conveying part; the denitration assembly comprises a fixing frame, a swinging part rotationally arranged on the fixing frame and a rotating part rotationally arranged in the swinging part; a plate-type denitration catalyst is arranged in the rotating part in a sliding manner; the plate-type denitration catalyst comprises three groups of denitration catalyst blocks which are coaxially arranged; according to the device, the positions of the three groups of denitration catalyst blocks are sequentially changed through linkage matching of all the parts, so that full contact between the denitration catalyst blocks at the front end and the rear end of the plate-type denitration catalyst and flue gas is ensured, and meanwhile, full contact between the denitration catalyst block in the middle and the flue gas is ensured; and the utilization rate of the plate-type denitration catalyst is improved, so that waste is reduced.

The invention belongs to the technical field of denitration catalyst regeneration, and particularly relates to a regeneration method of a silicon-arsenic poisoning denitration catalyst, which comprises the following steps: 1) blowing soot and cleaning the silicon-arsenic poisoning denitration catalyst; (2) carrying out alkali washing, acid washing and chemical washing on the cleaned silicon-arsenic poisoning denitration catalyst; the pickling solution is a mixture of acid and a copper corrosion inhibitor; a solution of the chemical washing is a mixture of hydrofluoric acid and a corrosion inhibitor; according to the method, silicon and arsenic can be removed, and the denitration efficiency and activity of the regenerated denitration catalyst can be improved.

The utility model discloses an electric calcined coal waste gas denitration device in the technical field of flue gas treatment equipment, which comprises a preheater, a gas inlet is connected above the preheater, a connecting pipe is arranged on one side of the preheater, a pipeline is arranged at one end of the connecting pipe, a main water pipe is arranged on the outer side of the pipeline, a through pipe is arranged above the pipeline, and a gas outlet is formed in the other end of the pipeline. A tower body is arranged at one end of the through pipe, a fan is arranged at the bottom of the tower body, an air outlet is formed in the bottom of the fan, a nozzle pipe is arranged on the inner side of the pipeline, and a first mixer layer and a second mixer layer are arranged on the inner side of the pipeline; a rectifying heater, a first catalyst, a second catalyst, a third catalyst and a standby catalyst are sequentially arranged on the inner side of the tower body, through the arrangement of a heating structure, a mixer and a catalyst structure, nitrate contained in waste gas can be fully mixed, the phenomenon of loss of a large number of reducing agents is avoided, and the denitration effect of the device is further improved.

The invention discloses a low-temperature denitration catalyst, a preparation method and a denitration catalysis filter material, and relates to the technical field of denitration catalysis. The catalyst provided by the invention is of a sphere-like structure formed by stacking (Mn < 0.983 > Fe < 0.017 >) < 2 > O < 3 > nanosheets. Uniformly dispersing ferric salt into the solution containing the MnO2 microspheres to obtain a mixed solution; and then carrying out water bath evaporation drying on the mixed solution, drying the obtained solid product in a drying oven, and carrying out high-temperature calcination on the dried product to obtain the low-temperature denitration catalyst. The denitration catalytic filter material provided by the invention comprises the low-temperature denitration catalyst. The nanosheets are stacked to form the sphere-like structure, so that the active components are uniformly distributed and are not easy to agglomerate; the denitration performance of the manganese-based catalyst at a low temperature is improved through the mutual synergistic effect between Mn and Fe metal elements, and the peak value can be reached at a relatively low temperature; the catalyst has good alkali metal poisoning resistance and can effectively prevent poisoning and inactivation of the catalyst.

The utility model discloses a device for preparing a slurry organic desulfurization and denitrification agent through co-baking of biomass coupled with CaO. The device comprises a biomass bin, a CaO bin, a screw feeder, a double-paddle baking-crushing machine, an external combustor, a condenser, a wet ball mill, a urea aqueous solution tank, a dispersing agent tank and the like. Biomass and CaO are respectively fed into the double-blade baking-crushing machine through the screw feeder to be subjected to baking reaction; keeping the temperature of the baked material at the baking temperature, feeding the baked material into a condenser for quenching, mixing the quenched and baked biomass with the condensed baking liquid to form slurry, feeding the mixed slurry into a wet ball mill, and stirring and grinding the mixed slurry together with a urea aqueous solution and a dispersing agent to prepare biomass-based organic desulfurization and denitrification agent slurry. The desulfurization and denitrification agent provided by the utility model has double denitrification effects, namely a reburning denitrification effect of baked biomass powder and a deep reduction denitrification effect of urea under the catalytic activation effect of baking liquid, and is suitable for desulfurization and denitrification transformation of distributed small-sized industrial kilns.

The utility model relates to the technical field of non-ferrous metal metallurgy, and discloses a novel denitration device which comprises a box body, a fixing plate is fixedly connected to the back face of the box body, and a hinge is fixedly connected to one side face of the box body. The flue gas denitration device has the following advantages and effects that the spiral conveying mechanism, the unloading mechanism and the Roots blower are arranged, the spiral conveying mechanism is used for conveying solid urea, and then the unloading mechanism is used for spraying the solid urea out through the Roots blower, so that a denitration medicament is fully mixed with flue gas, and the denitration medicament is sprayed into the flue gas to react with NOX so as to achieve the denitration purpose; the products are H2O, N2 and CO2, a novel solid state denitration mode is adopted, solid urea is sprayed into a hearth through a Roots blower, and the denitration effect is greatly improved; only limited field space is needed, so that the size is greatly reduced; and secondly, the cost of the urea is lower than that of other denitration agents, so that the effects of low cost, no need of newly adding large equipment and high denitration efficiency are achieved.

The invention discloses a method for resource utilization of pollutant components of fluorobenzene synthesis tail gas based on activated carbon assisted denitration, including the synthetic tail gas from the synthesis reactor in the fluorobenzene synthesis process, characterized in that the synthetic tail gas enters the activated carbon adsorption tower for adsorption after deep cooling and defluorinating fluorobenzene, nitrogen dioxide and part of hydrogen fluoride in a deep cooling heat exchanger, and the deep cooling tail gas before entering the activated carbon adsorption tower is periodically sprayed with ammonia and air, and the activated carbon adsorption tower after adsorption and denitration is desorbed, and the desorbed tail gas is returned to the synthesis reactor for reuse after condensation and dehydration. The process route of the invention is simple, clean and environmentally friendly, stable and efficient, and has high denitration efficiency.

The invention relates to the technical field of catalyst synthesis, and discloses a catalyst synthesis parameter optimization method and system based on denitration index evaluation, and the method comprises the steps: setting a to-be-selected metal element set, obtaining a test catalyst set based on the to-be-selected metal element set, carrying out the catalytic simulation of the test catalyst set according to a plurality of to-be-denitrated scenes and a denitration performance evaluation standard, and obtaining a catalyst denitration data set, performing deep learning by using the catalyst denitration data set to obtain a catalyst component selection model, and obtaining a target catalyst according to the target scene feature vector and the catalyst component selection model. The design accuracy and denitration performance of the catalyst can be improved, and the development period is remarkably shortened.

The utility model discloses a device for reducing ammonia escape during cement denitration. The device comprises a stirring structure and a vertical movement structure, wherein the stirring structure is arranged at the upper part in an outer cylinder and is used for fully stirring and mixing a cement raw material and a catalyst; the vertical movement structure is used for realizing vertical movement of stirring blades of the stirring structure. The stirring rod drives the limiting wheel to slide on the upper surface of the sliding rail through the connecting plate, when the limiting wheel slides to the convex part of the concave-convex surface of the surface of the sliding rail, the elastic telescopic rod is extruded to enable the stirring blade below to ascend, and when the limiting wheel slides to the concave part of the sliding rail, the elastic telescopic rod is reset to enable the stirring blade to ascend. And the connecting plate and the limiting wheel are extruded downwards, and meanwhile, the stirring blades descend, so that the stirring blades slide up and down while horizontally rotating and stirring in the outer cylinder, and the stirring uniformity and efficiency are remarkably improved, thereby ensuring that a cement raw material and a catalyst are fully mixed, effectively improving the denitration effect and reducing ammonia escape.

The invention discloses a flue gas desulfurization and denitrification energy-saving and environment-friendly device for an industrial boiler, and belongs to the technical field of environment-friendly devices.The flue gas desulfurization and denitrification energy-saving and environment-friendly device comprises a mounting platform and a reactor shell, a reaction cavity, a cleaning cavity and a thermal self-adaption catalysis assembly are arranged in the reactor shell, and a cavity expansion assembly is arranged above the reactor shell; and a flue gas mixing pipe and a discharge pipe are respectively arranged at the end parts of the reactor shell. Through the synergistic effect of the cavity expansion assembly and the cleaning cavity, the reaction space can be dynamically adjusted according to opening and closing of the furnace door of the forging furnace, the denitration activity and the structural stability of the catalytic plug in the furnace door opening period can be maintained by arranging the thermal self-adaptive catalytic assembly, and the denitration efficiency is improved by arranging the cleaning cavity. The multi-stage push cylinder drives the thermal self-adaption catalysis assembly to descend to the cleaning cavity, the high-pressure air nozzle sprays gas to clean the catalysis plug in the descending process, meanwhile, the catalysis plug can be replaced by disassembling the heat preservation clamping plate, and therefore the cleaning and maintaining functions are integrated on a single station, and the working efficiency is improved.

The utility model relates to a boiler tail gas desulfurization denitration dust removal device, which comprises two groups of treatment chambers which are communicated and supported on a base, and an exhaust pipe connected to the tail ends of the two groups of treatment chambers, each treatment chamber comprises a cylinder body, a cover plate, a plurality of treatment agent placing seats, sliding covers and a dust remover, and the number of the sliding covers is equal to that of the treatment agent placing seats; an opening is formed in one end of the cylinder body, and the cover plate detachably covers the opening of the cylinder body. According to the utility model, the dust remover is matched with the treating agent placing seat, so that waste gas can scatter and flow in the barrel body after being subjected to dust removal, and the waste gas can be in full contact with a desulfurization catalyst or a denitration catalyst in the treating agent placing seat, thereby improving the desulfurization or denitration effect of the waste gas; through the combined use of the two groups of treatment chambers, the waste gas can be subjected to desulfurization and denitrification treatment, and meanwhile, the waste gas can be subjected to two-time dust removal and filtration treatment, so that the content of particulate matter impurities in waste gas emission is reduced.

The utility model discloses flue gas denitration ammonia spraying equipment, which comprises a flue gas denitration ammonia spraying main body, and relates to the technical field of denitration equipment, one side of the outer end of the flue gas denitration ammonia spraying main body is fixedly connected with a servo motor, and the other side of the outer end of the flue gas denitration ammonia spraying main body is fixedly connected with an ammonia water storage box; the output end of the servo motor is fixedly connected with a driving rod, the other end of the driving rod is fixedly connected with a rotating disc, the other end of the rotating disc is fixedly connected with a fixed convex rod, the outer side of the fixed convex rod is slidably connected with a linkage rod, the servo motor is started to drive the driving rod to rotate, and the driving rod drives the rotating disc to rotate; the rotating disc drives the fixed protruding rod to rotate, the fixed protruding rod drives the linkage rod to rotate, the fixed protruding rod moves in a fixed protruding rod moving groove in the inner side of the linkage rod, the linkage rod rotates and moves on the rotating rod, and the linkage rod drives the driving incomplete gear to rotate in a reciprocating mode.

The invention belongs to the technical field of flue gas denitration, and discloses a multi-section long-service-life energy-saving efficient multi-nozzle spray gun which comprises a plurality of gun bodies spliced end to end, first reducing agent inner pipes communicated with one another are arranged in the gun bodies, second reducing agent inner pipes are arranged in the gun body located at the head end, and first reducing agent inner pipes are arranged in the gun body located at the tail end; the gun body at the head end is provided with a first nozzle communicated with the second reducing agent inner pipe, and the gun bodies at the middle part and the tail part are provided with second nozzles communicated with the first reducing agent inner pipe; the first mixer is connected to the head end of the first reducing agent inner pipe, and a first reducing agent inlet and a first atomized gas inlet are formed in the first mixer; the second mixer is connected to the head end of the second reducing agent inner pipe, and a second reducing agent inlet and a second atomized gas inlet are formed in the second mixer; an air inlet and an air outlet are formed in the gun body at the head end, the air inlet is connected with an air supply source, and the air outlet is communicated with the first atomized air inlet and the second atomized air inlet. The spray gun is good in flue gas denitration effect and long in service life.

The present invention relates to the technical field of chain grate-rotary kiln SCR denitrification, and specifically to an optimized chain grate-rotary kiln SCR denitrification system and a denitrification process thereof. The optimized chain grate-rotary kiln SCR denitrification system comprises a chain grate, a rotary kiln, an annular cooler, an SCR denitrification system, a multi-tube dust collector, and a circulating fan; the chain grate is segmented into a drying section I, a drying section II, and a preheating section in a "three-section and two-chamber" manner; two groups of SCR denitrification systems are arranged between the multi-tube dust collector and the circulating fan, and are distributed on both sides of the chain grate. The present invention provides an optimized chain grate-rotary kiln SCR denitrification system, which achieves stable and standard emission of nitrogen oxides in flue gas, promotes the optimization of pellet production process and the improvement of pellet quality, and provides technical support for the effective application of the SCR denitrification process in the chain grate-rotary kiln independent pellet production line, which has broad application prospects and promotion value. The present invention also provides its denitrification process.

This invention relates to a method for the selective catalytic reduction of NO by ammonia. x This invention relates to a catalyst, its preparation method, and its application, belonging to the field of environmental catalysis and air pollution control technology. The catalyst comprises a support, a main active component, and a modifying agent. The support is selected from SAPO-18 molecular sieve, the main active component is selected from Cu, and the modifying agent is selected from Zr. The space velocity is 88,000 h⁻¹. ‑1 At that time, the ZrCu-SAPO-18 molecular sieve catalyst, within the temperature range of 225–450℃, produced NO x The conversion rate reached over 90%; after hydrothermal treatment at 750℃ for 12 hours, NO was reduced within the range of 175–400℃. x The conversion rate remains above 90%. The catalyst of this invention can be used to remove NO from diesel vehicle exhaust and stationary source flue gas. x Highly efficient removal.

The discharging device for flue gas purification and denitration comprises a purification box, and a purification and denitration mechanism is arranged in the purification box; the purification and denitration mechanism comprises a partition plate, the partition plate is fixed to the purification box and provided with a plurality of through openings, each through opening is provided with a first filter screen, a spraying mechanism is fixed to the upper portion of the partition plate and connected with an external circulating liquid conveying mechanism, and the input end of the circulating liquid conveying mechanism is located below the partition plate and communicated with the interior of the purification box; a treatment tank is mounted at the top of the purification box; the lower end of the treatment tank communicates with the purification box through a conduit; and the upper end of the treatment tank is communicated with the outside through a discharge pipe. The discharge device for flue gas purification and denitration provided by the utility model can improve the flue gas denitration effect.