148 results about "Flue-gas desulfurization" patented technology

This invention relates to the field of flue gas treatment technology. It discloses an integrated flue gas desulfurization, denitrification, and decarbonization method based on a hypergravity reactor. S1: Flue gas is pressurized by a booster fan and then enters a concentration and cooling tower for heat exchange and cooling. S31: If the flue gas detection device fails to meet the requirements, the flue gas enters the secondary thin-plate hypergravity treatment device connected in series via a series return gas branch for secondary treatment. S32: If the flue gas detection device meets the requirements, the flue gas enters the main flue gas emission path via the series return gas branch and the flue gas emission branch. The main flue gas emission path transmits the flue gas to the hypergravity decarbonization reactor. The secondary thin-plate hypergravity treatment device is ultra-thin and divided into multiple vertically distributed sections, ensuring that the grading is performed in the same or nearly identical space, reducing the height of the secondary thin-plate hypergravity treatment device and minimizing energy consumption during initial operation.

This invention discloses an energy-saving and high-efficiency seawater flue gas desulfurization system and intelligent control method. The system includes a seawater supply unit, a desulfurization reaction unit, and an intelligent control unit. The seawater supply unit includes a seawater pool, a fixed-frequency pump, and a variable-frequency pump. Electric isolation valves are installed on the outlet pipes of the fixed-frequency pump and the variable-frequency pump. The desulfurization reaction unit includes an absorption tower with a single-layer spray layer inside, and the main outlet pipe is connected to the single-layer spray layer. The intelligent control unit is electrically connected to the fixed-frequency pump, the variable-frequency pump, and the electric isolation valve. It is used to monitor flue gas parameters and actual flow rate in real time, and dynamically adjust the frequency of the variable-frequency pump, the start and stop of the fixed-frequency pump, and the opening and closing of the electric isolation valve to match the water supply with the desulfurization load. This invention achieves continuous and precise flow rate regulation, significantly reducing energy consumption and investment costs.

This utility model relates to the field of ironmaking technology, specifically to a fluidization device for the conveying pipeline of a flue gas desulfurization silo in a hot blast stove. This device addresses the problem of poor fluidity and easy adhesion of the desulfurizing agent, preventing it from fully reacting with the waste gas and resulting in inadequate waste gas treatment. The device includes a first and second ball valve on both sides of the silo bottom, a first and second fluidizing pipe running inside the branch pipes, and a fifth and sixth ball valve outside the two branch pipes. When blockage occurs, the first and second ball valves are opened to introduce nitrogen into the bottom of the silo for the first fluidization. Then, the first and second fluidizing pipes are opened, and nitrogen is introduced for the second fluidization. The fifth and sixth ball valves are further opened to introduce nitrogen for the third fluidization. Finally, the loss-in-weight feeder is activated to feed material into the flue gas desulfurization silo through mechanical stirring, reducing material accumulation, lowering the probability of blockage, and effectively solving the problems of material buildup, blockage, and poor material flow at the silo bottom.

This application discloses a flue gas desulfurization and denitrification device, relating to the field of flue gas desulfurization and denitrification technology. It includes: a tower body, with support legs fixedly installed on the four corners of the tower body's bottom outer wall; and further includes: an inlet pipe, an outlet pipe, a reserved pipe, nozzles, a spraying assembly, a swinging assembly, and a scraper assembly. The inlet pipe is horizontally and fixedly installed at the bottom of one side of the tower body's outer wall; the outlet pipe is horizontally and fixedly installed at the top of the other side of the tower body's outer wall; the reserved pipe is horizontally and fixedly installed at the middle position of one side of the tower body's outer wall; there are two nozzles, each disposed within the tower body, with a water inlet hose fixedly installed at the interface of each nozzle. The beneficial effects of this application are: it achieves coordinated spraying through reciprocating movement, synchronous swinging, and overall rotation of the nozzles, forming irregular and overlapping spray paths, eliminating the regular gaps of fixed spraying, and improving the efficiency and effect of desulfurization and denitrification.

A method, apparatus, medium, and product for analyzing the oxidation degree of desulfurization slurry are disclosed, relating to the field of flue gas desulfurization technology. The method involves obtaining detection index values ​​of the desulfurization slurry; calculating the rate of change and fluctuation amplitude of each detection index value within a preset time window, and combining the rate of change and fluctuation amplitude into a condition feature vector; if the current desulfurization system is determined to be in a quasi-steady-state operating cycle, the original oxidation index is compensated and corrected using interference parameter values ​​to obtain a corrected oxidation index; if the current desulfurization system is determined to be in a dynamic disturbance cycle, a correction model for the index value corresponding to the dynamic disturbance cycle is determined, and the original oxidation index is input into the correction model to obtain the corrected oxidation index; based on the corrected oxidation index, the oxidation degree of the desulfurization slurry is determined, and the frequency converter frequency or inlet guide vane opening of the oxidation fan is adjusted based on the oxidation degree. Implementing this application improves the accuracy of analyzing the oxidation degree of desulfurization slurry.

This invention discloses a flue gas desulfurization and denitrification treatment device and method for lead-zinc smelting. It relates to a flue gas treatment device, including a desulfurization component and a denitrification component. The desulfurization component includes a treatment chamber, with an inlet pipe fixedly connected to its side wall and a first and second partition fixedly connected to its inner wall. The inlet pipe communicates with the space between the first and second partitions. The first partition is located above the second partition, and a bubbling desulfurization pipe is fixedly connected below the second partition, located at the bottom of the treatment chamber. After entering the treatment chamber, the flue gas undergoes preliminary desulfurization treatment through spraying from the spray pipe. Then, the flue gas enters the space below the second partition for secondary treatment via bubbling. Finally, the treated flue gas enters the space above the first partition for further purification, significantly improving the treatment effect. Furthermore, the device adjusts the spraying method accordingly, greatly enhancing the adequacy of the spray desulfurization process and resulting in excellent performance.

This invention discloses an apparatus and process for removing sulfur dioxide from flue gas using siderite slurry, relating to the field of environmental protection technology. The apparatus comprises six major components: desulfurization, slurry circulation, slurry replenishment, oxidation, defoaming emission, and spent slurry treatment. The components are interconnected by pipelines. The process includes siderite pretreatment slurry preparation, slurry replenishment, flue gas desulfurization, sulfite oxidation, flue gas defoaming emission, and spent slurry treatment. Siderite is crushed and ground into a slurry with a specific particle size and solids content, which is then contacted countercurrently with sulfur-containing flue gas. Utilizing ferric carbonate, magnesium carbonate, and calcium carbonate in the slurry as desulfurizing agents, combined with the oxidation effect of air and ferric ions, sulfur dioxide is converted into ferric sulfate and calcium sulfate, achieving desulfurization. This invention has high desulfurization efficiency, with the sulfur dioxide content in the purified flue gas below 50 mg / Nm³. 3 It makes full use of low-grade siderite resources, and the desulfurization by-products can be utilized as resources. The process is simple and has no secondary pollution, resulting in significant economic and environmental benefits.

This utility model provides a rotary kiln flue gas desulfurization device with a sodium-based powder uniformly spraying structure, including: a dust removal component, a powder spraying component, and a pipeline component. The powder spraying component is connected to the pipeline component through a conveying pipe, and the pipeline component is connected to the dust removal component through a connecting pipe. The dust removal component includes: a dust collector body. The pipeline component includes: pipeline one, pipeline two, and pipeline three. Pipeline one and pipeline two are respectively installed at the left and right ends of pipeline two. A vibrator is installed on the upper surface of pipeline two. Compared with the prior art, this utility model has the following beneficial effects: by setting the powder spraying component, the uniform spraying of sodium-based powder during use can ensure that the desulfurizing agent is fully dispersed in the flue gas of the pipeline component. During the flue gas desulfurization process, uniform spraying can give the sodium-based powder more contact opportunities with acidic gases such as sulfur dioxide, thereby forming a better desulfurization effect.

This invention discloses an integrated treatment method for desulfurization, denitrification, and waste heat recovery of coke oven flue gas, belonging to the field of coke oven flue gas treatment technology. The method includes: 1) flue gas pretreatment and high-temperature waste heat recovery; 2) directional oxidation conversion of nitrogen oxides and removal of residual oxidants; 3) synergistic desulfurization and denitrification treatment with activated carbon / activated coke; 4) side reaction suppression and control; 5) low-temperature waste heat recovery and reheat utilization; and 6) activated carbon / activated coke regeneration and sulfur resource recovery. This invention converts NO in flue gas into high-valence NO₂ through a pre-oxidation reaction, improving the kinetics of the denitrification reaction, increasing denitrification efficiency, and reducing ammonia consumption. By controlling the SO₂ concentration and acid gas content at the desulfurization layer outlet, it effectively inhibits the deposition of ammonium salts such as (NH₄)₂SO₄ and NH₄Cl, reducing bed blockage. Through high and low temperature staged waste heat recovery, it achieves tiered utilization of heat, improving the overall thermal efficiency of the system. This achieves synergistic optimization of efficient pollutant removal and efficient energy utilization.

This utility model provides a desulfurization device for flue gas from municipal solid waste combustion, comprising: a combustion component and a desulfurization component. Insulating bricks are fixedly installed inside the combustion component. Both the combustion component and the insulating bricks are connected through multiple air inlet pipes. An ash removal mechanism is installed inside the combustion component. The top of the desulfurization component is fixedly installed to a support, and an end cap is fixedly installed in the middle of the support. The end cap is fixedly connected to a water inlet pipe, and a spraying mechanism is rotatably connected inside the end cap. This application uses a combustion component to incinerate municipal solid waste and sets up multiple air inlet pipes for the supply of air and oxygen, which can achieve complete combustion to improve the treatment effect. Combustion residue is collected by a guide plate to ensure air intake and improve combustion completeness. The desulfurization component absorbs harmful gases in the flue gas. Multiple ring pipes are used to arrange the nozzles, and the nozzles are designed so that the air pressure generated during spraying drives the ring pipes to rotate, improving the desulfurization effect.

The application discloses a kind of multilayer core-shell structure simultaneously desulfurization denitration SCR catalyst and its preparation method and application, belong to flue gas catalyst preparation field.The catalyst includes denitration active core, complex intermediate layer and surface hydrophobic protective layer;The denitration active core is formed by manganese oxide and cerium oxide loaded on TiO2 carrier;The complex intermediate layer has mesoporous structure, and the material forming the complex intermediate layer is the complex of metal ion M and nitrogen-containing organic ligand.The catalyst of the application has outstanding denitration desulfurization performance, excellent stability, longer service life and water resistance and sulfur poisoning resistance in complex flue gas environment, and is applied to flue gas desulfurization and / or denitration, which can simultaneously achieve desulfurization and denitration in the same temperature range, get rid of the dependence on complex series process, and avoid the problems of blockage and corrosion of downstream heat exchanger and flue in series process.

The present application relates to the technical fields of wet flue gas desulfurization, in particular to a limestone wet flue gas desulfurization oxidizing air pipeline system, which comprises an oxidizing air fan and a plurality of oxidizing air main pipes, the plurality of oxidizing air main pipes are connected to the oxidizing air fan through a connecting pipe after being connected in parallel, the oxidizing air main pipes pass through the tower wall of an absorption tower and are located in the absorption tower, the oxidizing air main pipes are inclined downward, a plurality of oxidizing air branch pipes are uniformly distributed on the oxidizing air main pipes, the oxidizing air branch pipes are inclined downward away from the jet end of the oxidizing air main pipes, and a plurality of air outlets are arranged on the lower side walls of the oxidizing air main pipes and the oxidizing air branch pipes. Through the structural design, the present application realizes on-line descaling, prevents slurry from flowing back into the pipeline, uniformly diffuses the oxidizing air, guarantees stable operation of the system, improves the desulfurization efficiency and reduces the maintenance cost.

This application relates to the technical field of waste gas treatment equipment, and discloses a boiler flue gas desulfurization and denitrification treatment device, including a desulfurization and denitrification cylinder. A filter box is fixedly installed on the left side of the desulfurization and denitrification cylinder, a mixing box is fixedly installed on the top of the desulfurization and denitrification cylinder, and a filtrate box is fixedly installed at the bottom of the desulfurization and denitrification cylinder. The same functional box is fixedly installed on the right side of the filtrate box, the right side of the desulfurization and denitrification cylinder, and the right side of the mixing box. The same conveying chamber is fixedly installed on the top of the functional box and the top of the mixing box. A chemical storage tank is fixedly installed on the top of the conveying chamber. An air inlet pipe is provided on the left side of the filter box, an activated carbon adsorption plate is provided inside the filter box, and a spraying mechanism is provided inside the desulfurization and denitrification cylinder. This application has the following advantages and effects: by setting up a conveying mechanism and a stirring mechanism, it can ensure the uniformity of the reagent concentration and improve the reaction activity, and can achieve the uniform addition of the reagent and improve the mixing efficiency.

This invention belongs to the field of waste gas treatment technology, and in particular to a desulfurization tower for petroleum coke calcination flue gas. It includes a tower body with several circumferentially arrayed and equidistantly distributed stirring blades. A dual-spray system is installed on each stirring blade. The tower body also includes a switching mechanism for driving the stirring blades to rotate and activating a dry powder mode during rotation. The dual-spray system allows external aqueous agents to sequentially pass through a water pipe, an aqueous agent channel within an annular shaft, a first semi-circular channel, and a bend pipe, ultimately being sprayed out through a nozzle. External dry powder sequentially passes through a powder pipe, a dry powder channel within the annular shaft, and a second semi-circular channel, ultimately being thrown out through a transverse support rod, thus solving the problem of the relatively limited usage of traditional desulfurization towers.

This utility model relates to the field of waste heat recovery technology for desulfurization slurry, and more particularly to a waste heat recovery system for boiler flue gas desulfurization slurry based on flash evaporation. The system includes a flue gas desulfurization tower, a flash tank, a steam-water heat exchanger, a boiler air heater, and a condensate tank. The bottom first slurry outlet of the flue gas desulfurization tower is connected to the upper slurry circulation inlet, and the bottom second slurry outlet is connected to the flash tank. The flash tank converts the water in the desulfurization slurry into steam through flash evaporation. The steam outlet of the flash tank sends the steam to the steam-water heat exchanger through a steam pipeline. The liquid outlet of the flash tank is connected to the liquid inlet of the flue gas desulfurization tower. The steam-water heat exchanger is connected to the boiler air heater, and the condensate outlet of the steam-water heat exchanger is connected to the condensate tank. This utility model achieves waste heat utilization of the desulfurization slurry through flash evaporation, reducing the final flue gas temperature of the boiler and improving the primary energy conversion efficiency of the boiler.

This utility model relates to the field of flue gas desulfurization absorption tower technology, and discloses a flue gas desulfurization absorption tower, including a reaction tower. An air inlet pipe is fixedly connected to the lower left side of the reaction tower, and a liquid suction pump is fixedly connected to the right side of the reaction tower. A liquid suction pipe is fixedly connected to the bottom of the liquid suction pump, and a liquid delivery pipe is fixedly connected to the top of the liquid suction pump. A liquid distribution pipe is fixedly connected to the left end of the liquid delivery pipe, and an atomizing nozzle is fixedly connected to the bottom of the liquid distribution pipe. A baffle plate is fixedly connected to the upper inside of the reaction tower, and a vent is provided on the top of the baffle plate. By setting the baffle plate, vent, etc., in conjunction with the atomizing nozzle, the baffle plate can block and concentrate the flue gas entering the reaction tower, so that it can only be discharged through the vent and thus only be covered by the liquid sprayed by the atomizing nozzle, so that the liquid and flue gas can fully contact each other, avoiding dead zones, thereby improving the desulfurization effect of the flue gas, enhancing the desulfurization efficiency, and facilitating operation by staff.

The utility model relates to flue gas desulfurization system technical field, specifically a kind of flue gas desulfurization system pump emergency cooling water supply device, including absorption tower, and absorption tower is connected with slurry pump, slurry circulating pump and slurry discharge pump by pipeline;Still include trolley, the upper portion of trolley is equipped with emergency water tank, and emergency water tank is connected with water supply pipe and return pipe, and first water pump is connected on water supply pipe;Slurry pump, slurry circulating pump and slurry discharge pump are all equipped with mechanical seal installation cavity, and mechanical seal installation cavity is connected with the water inlet nozzle and water outlet nozzle that can be inserted with water supply pipe and return pipe;The utility model is provided with water tank, water supply pipe, return pipe, can provide cooling water for the mechanical seal of pump using the water in emergency water tank when the water supply pipeline of process water tank is broken, prevent cooling water from breaking flow and lead to pump damage;By setting up cold water machine, the cooling water of circulation can be cooled.

The utility model relates to desulfurizing tower technical field discloses a kind of wet flue gas desulfurization tower, including tower body, desulfurization component and be used for the spray of the spray component to desulfurization component, tower body is equipped with air inlet and air outlet, desulfurization component is arranged in tower body, desulfurization component includes sieve plate and multiple baffle, the outer periphery of sieve plate is connected with the inner wall of tower body, multiple baffle is spacedly installed at the top of sieve plate, form pass-through smoke channel between adjacent two baffle, baffle is corrugated plate, two side walls of pass-through smoke channel respectively are equipped with a group of baffle, two groups of baffle in pass-through smoke channel are staggered arrangement in the direction of smoke flow, pass-through smoke channel is filled with filler;The utility model cooperates through serpentine pass-through smoke channel and baffle, reduce the flow speed of flue gas and treatment solution, prolong residence time, to improve the reaction length of flue gas and treatment solution, improve desulfurization efficiency.

The utility model relates to a flue gas desulfurization technical field, it is a kind of coal powder boiler desulfurization device using PTA inorganic sludge, it includes including sludge pretreatment unit, sludge treatment unit, desulfurization slurry preparation tank, desulfurization tower, boiler, dust catcher and chimney, softening pool left side feed end fixed communication has a plurality of sewage inlet pipeline, softening pool discharge end and sedimentation tank feed end fixed communication has sedimentation tank feed pipeline;Sludge storage tank discharge end and between desulfurization slurry preparation tank fixed communication has slurry pipeline;Boiler exhaust end and dust catcher communication dust inlet pipeline;Dust catcher outlet and desulfurization tower lower part communication has dust after flue gas pipeline;Desulfurization slurry preparation tank discharge end and desulfurization tower upper part liquid inlet end between fixed communication has desulfurization slurry pipeline.The utility model is reasonable and compact in structure, convenient to use, its use PTA inorganic sludge has realized the desulfurization of boiler flue gas, and processing efficiency is high, and operating cost is low, with environmental protection, labour saving, simple, efficient characteristics.

This utility model relates to the technical field of feeding equipment and discloses a feeding device for flue gas desulfurization and denitrification, including a feeding structure and a flue gas treatment device. The flue gas treatment device is fixedly connected to the outer wall of the feeding structure. The feeding structure includes a support frame, and a hopper is fixedly connected to the top of the support frame. Additives are put into the hopper and filtered in advance by a filter screen to prevent packaging bags and other debris from entering the hopper and to prevent the additives from clogging the inside of the feeding spiral tube. The servo motor is started to drive the rotating shaft to rotate, which also drives the eccentric wheel to rotate and contact the bottom of the mounting frame. The eccentric wheel squeezes the mounting frame, causing the mounting frame to move up and down along the guide rod, and also drives the filter screen to move up and down. In this way, the additives move up and down on the filter screen, making it easier for clumps of additives to disperse, accelerating the screening and filtration of additives, and making the feeding equipment more efficient and safe.

This invention addresses the problem in existing flue gas dust removal technologies where optimal dust removal efficiency is achieved only at filtration velocities below 0.45 m / min. Higher filtration velocities lead to increased resistance in the fiberglass filter bag system, hindering the removal of fly ash. This invention provides a flue gas purification system and production line for industrial silicon smelting. Specifically, it relates to the field of flue gas desulfurization, denitrification, and dust removal technology for industrial silicon DC and AC furnaces. The system includes a primary waste heat boiler, a filter dust collector, metal filter bags, a denitrification device, a secondary waste heat boiler, a dust removal drive device, and a wet desulfurization tower. The filter dust collector's filtration velocity is set at 0.87 m / min. The outlet flue of the denitrification device passes through the dust collector housing to improve waste heat recovery efficiency. The dust removal drive device employs a three-dimensional flow fan. The filter dust collector uses metal filter bags, and its filtration velocity can reach 0.87 m / min.

The application discloses a flue gas desulfurization emission concentration control method, related device and system, relates to the flue gas purification technical field, and will run process variable time series data be input into the pre-trained deep learning prediction model, eliminate sequence non-stationarity and variable scale difference by the normalization layer, the embedding layer converts the time series data into the time series slice embedding vector which retains semantic information, the decoding layer extracts the causal characteristics between the running variables and the emission concentration by dynamically modeling the dependency relationship between each time series slice through the attention mechanism, and the output layer outputs the emission concentration prediction value through the pooling and linear transformation. The prediction value replaces the current measured value and is input into the PID control module, so that the control loop knows the change trend of the emission concentration in advance, the absorbent addition amount is adjusted before the actual change of the concentration, time delays introduced by the reaction process, equipment execution and measurement points are effectively compensated, the timeliness and accuracy of the absorbent adjustment are improved, standard flue gas emission is ensured, and the absorbent consumption is reduced.

The utility model relates to flue gas treatment technical field, and disclose a kind of flue gas desulfurization and denitrification spray tower, including including spray tower, the spray tower is from lower to upper by air inlet section, shell and exhaust section, the left side of air inlet section is provided with air inlet pipe, the left side of air inlet section is fixedly connected with drain valve, the right side of air inlet section is provided with filter assembly, the right side of filter assembly is provided with spray assembly;The left and right inner walls of shell are respectively fixedly connected with plug rail, and the linkage structure (L type threaded rod+butterfly nut limit) of plug rail type filler frame and detachable sealing plate is linked, the quick disassembly of filler layer is realized, and only external operation is needed when replacing, entire filler frame can be extracted horizontally, personnel is not needed to enter spray tower internal operation, eliminate the security risk that traditional filler replacement needs aerial work or in-depth tower, shorten maintenance time simultaneously, reduce labor intensity, especially applicable to the working condition of frequent replacement filler.

The present application relates to the technical field of flue gas desulfurization catalyst, and disclose a kind of active carbon catalyst for flue gas desulfurization and preparation method, the present application is added to container water, copper salt, after stirring, amino naphthalene formic acid graft cellulose is added, ion crosslinking is carried out, crosslinking product is placed in tube furnace, calcination, activation is carried out, and the active carbon catalyst for flue gas desulfurization is obtained. With cellulose matrix and high carbon naphthalene ring as carbon source, form high specific surface area, high stability carbon skeleton porous active carbon, large specific surface area, abundant porosity, contain a large number of copper oxide catalytic active component, can effectively reduce the content and concentration of sulfur dioxide in flue gas, after high temperature calcination in active carbon matrix form active nitrogen structure, can improve the adsorption capacity of active carbon to SO2.

This invention provides a dry quenching coke treatment system, relating to the technical field of coke production equipment. The dry quenching coke treatment system includes: a dry quenching furnace for cooling high-temperature coke via gas heat exchange, and a waste heat boiler for producing steam using the high-temperature gas produced by the dry quenching furnace; it is equipped with a gas output pipeline and a gas input pipeline connecting the dry quenching furnace and the waste heat boiler; the gas output pipeline is used to supply gas to the waste heat boiler; the gas input pipeline is used to supply gas to the dry quenching furnace. A circulating fan and a heat pipe heat exchanger are installed on the gas input pipeline; a flue gas extraction port is installed on the pipeline between the circulating fan and the heat pipe heat exchanger, and the flue gas extraction port is connected to a desulfurization treatment system through a sealed flue gas emission pipeline. This invention can improve the flue gas desulfurization effect of the system and enhance the overall environmental friendliness of the system's production.

The utility model relates to a lime slurry pump for flue gas desulfurization, including base, set up on base motor, pump body subassembly, the output shaft of motor is connected with pump body subassembly transmission through pivot, the shell of motor has multiple water channels in the annular distribution along the axial direction, the one end of each water channel is connected through the water inlet ring, the other end is connected through the water outlet ring, one end of motor is equipped with the support, the fan that is connected with motor output shaft transmission is rotatably equipped in the support, the fixed mounting of heat dissipation water tank is located in one side of fan on the support, the water inlet, the backwater mouth are equipped on heat dissipation water tank respectively, the water inlet is connected through the water pipe with the water inlet ring, is equipped with cooling water pump on the water pipe, the backwater mouth is connected through the backwater pipe with the water outlet ring, through setting up water channel in the motor shell, the motor core heating component is all -round cooling, simultaneously, the cooling water pump drives the cooling liquid to circulate, the fan of synchronous drive of motor output shaft is combined to the heat dissipation water tank forced heat dissipation, constitutes the high -efficient heat dissipation closed loop.

The utility model relates to the technical field of flue gas desulfurization, and specifically relates to a desulfurization system oxidation air multipurpose system. The primary circulation system and the secondary circulation system are connected by an inlet flue, and the original flue gas flows through the primary circulation system and the secondary circulation system in sequence to carry out the desulfurization process. The primary circulation system includes two primary oxidation air fans, each of which is connected to the absorption tower through the same outlet pipeline. The primary oxidation air fan is used to introduce oxidation air into the outlet pipeline. The outlet pipeline is connected with a cleaning air pipeline and a sealing air pipeline. The cleaning air pipeline is connected to the wet electric dust collector to introduce cleaning air into the wet electric dust collector. The sealing air pipeline is connected to the accident spraying pipeline of the absorption tower to introduce sealing air into the accident spraying pipeline. The system improves the resource utilization rate and energy efficiency of the oxidation air system and avoids the investment waste caused by the repeated construction of the auxiliary air system, thereby significantly reducing the system operation and maintenance costs.