31results about How to "Efficient desulfurization and denitrification" patented technology

The invention relates to a method and a device for desulfurizing and denitrating flue gas based on cryogenic liquefaction and separation. According to the method and the device, the flue gas is desulfurized and denitrated at ultralow temperature by mainly depending on a cryogenic air liquefaction technology; the waste heat of the flue gas is recycled simultaneously; CO2 in the flue gas is collected; the purpose of efficiently desulfurizing and denitrating the flue gas by inputting a small amount of high-quality energy is achieved; chemical by-products can also be obtained; the waste heat is recycled; the purposes of changing waste into wealth and treating pollutants by using pollutants are achieved; equipment investment is reduced; the operation cost is reduced; the flue gas pollution is treated while certain economic benefit is brought; a high-cost flue gas treatment manner of only investing and bringing no benefit at present is changed. In addition, no catalyst is used; the waste heat, water, sulfides, nitrides and the CO2 in the flue gas are simultaneously subjected to waste reclamation; zero emission is achieved; the energy consumption is low; the equipment size is small; one set of the equipment is capable of simultaneously desulfurizing and denitrating; the automation degree is high; great help is supplied to haze treatment and air pollution treatment.

The invention provides an energy-saving and environmental-friendly layer-burning boiler suitable for solid fuel and a processing method of the layer-burning boiler. A boiler body of the layer-burningboiler is internally provided with a first cavity and a second cavity with the bottoms communicating with each other, a pre-burning air opening is formed in the middle boiler wall of the first cavityand/or a pre-burning air pipe is arranged in the middle of the first cavity, the areas/the area, on the upper part of the pre-burning air opening and/or on the upper part of the pre-burning air pipe,inside the first cavity are/is destructive distillation pyrolysis areas/ a destructive distillation pyrolysis area, the areas/the area, on the lower part of the pre-burning air opening and/or on the lower part of the pre-burning air pipe, inside the first cavity are/is semi-coke reduction pre-burning areas/ a semi-coke reduction pre-burning area, a first chain grate is arranged on the lower partsof the first cavity and the second cavity, a steam drum is arranged at the top of the second cavity, a rear arch is arranged below the steam drum, and at least two air chambers are arranged below thefirst chain grate. According to the energy-saving and environmental-friendly layer-burning boiler suitable for the solid fuel and the processing method of the layer-burning boiler, nitrogen oxides generated by burning are converted into harmless nitrogen through a reaction with reducing pyrolysis gas and semi-coke in a low-nitrogen pre-burning mode, and through methods such as combining pyrolysisdesulfurization and burning desulfurization and pyrolysis products of coal to form reburning denitration, emission of multi-pollutants such as SOx, NOx, and CO is effectively reduced.

The invention discloses a condensing dioxygen method desulfuration denitration integration device and a process thereof. The integration device comprises a boiler room smoke vent, a first level dry type dust removing device, an induced draft fan, a second level wet type dust removing device, a comprehensive desulfuration denitration tower and a chimney which are sequentially connected through flues. An ozone filling device is disposed on the flue on which the first level dry type dust removing device is connected with the induced draft fan. A liquid inlet of the second level wet type dust removing device and a liquid inlet of the comprehensive desulfuration denitration tower are both connected with a circulating water tank. A liquid outlet of the second level wet type dust removing device is connected with a precipitation water tank. A liquid outlet of the comprehensive desulfuration denitration tower and a liquid outlet of the precipitation water tank are both connected with the circulating water tank. A liquid outlet of the circulating water tank is connected with a crystallization tower, and a liquid outlet of the crystallization tower is connected with the circulating water tank. By means of a set of device, the process adopts the dry and wet method for desulfurating, denitrating and dedusting smoke of coal-fired boilers, and has the advantages of being high in energy efficiency, stable in operation, little in investment, low in operation cost, strong in applicability and free of secondary pollution, treating wastes with processes of wastes, recycling by-products and the like.

The invention belongs to the technical field of flue gas purification, and discloses a microwave coupling ultraviolet photocatalytic oxidation desulfurization and denitration method. The method comprises the steps that NO gas and SO2 gas are mixed and diluted by nitrogen and oxygen and enter a SO2 pre-absorption system to remove the SO2 preliminarily, then the gases enter a microwave reactor whichsupplies microwaves and excites an inorganic lamp, and the temperature is raised simultaneously in the process to improve the oxidation efficiency of a liquid phase oxidizing agent; subsequently, a liquid phase composite oxidizing agent is subjected to catalyzed activation in a photocatalytic reactor, a variety of highly active free radicals are produced, and then the highly reactive free radicals oxidize NO; the newly formed nitrogen oxides are absorbed by a subsequent absorption device; and exhaust gas after absorption is finally discharged into the atmosphere. The microwave coupling ultraviolet photocatalytic oxidation desulfurization and denitration method can meet the latest ultra-low emission pollutant standards of thermal power plants. The treatment system is lower in capital construction and operation costs, can simultaneously perform desulfurization and denitrification process, reduces floor space, and is easy to operate, and the desulfurization and denitration effect is morerapid and efficient.

The invention discloses a flue gas low-temperature efficient desulfurization and denitrification device and method. The flue gas low-temperature efficient desulfurization and denitrification device comprises a flue gas exhaust pipe, a desulfurization system, a mixer, an ammonia production system, a denitrification system, a recovery system and an ammonia production tank; firstly, a fluidized desulfurizing agent is sprayed out through nanopores in a powder spraying pipeline by utilizing a compressed air assembly, is fully mixed and filtered with flue gas introduced by the flue gas exhaust pipein a mixing filter, then is introduced into a mixer, and is fully mixed with heated and dried ammonia gas; the mixed gas passes through an active coke layer to adsorb sulfur dioxide gas, and desulfurization treatment is carried out; and secondly, the mixed gas penetrates through a plurality of catalyst layers to be subjected to denitrification reaction, impurities obtained by filtering the flue gas and the active coke layer are recycled by utilizing a recycling system, and meanwhile, the gas subjected to denitrification reaction is discharged into the atmosphere through the ammonia productiontank, so that efficient desulfurization and denitrification can be realized, and the cost is reduced.

The invention discloses a flue gas desulfurization and denitrification system and a use method thereof, and relates to the technical field of air pollution control, the flue gas desulfurization and denitrification system comprises an air inlet pipe, an additive generator, a dielectric barrier coupling positive pulse corona discharge device, an absorption tower, an exhaust pipe and connecting pipes. The air inlet pipe is connected with the additive generator, the additive generator, the dielectric barrier coupling positive pulse corona discharge device and the absorption tower are sequentially connected through connecting pipes, and the exhaust pipe is connected with the absorption tower. The simultaneous desulfurization and denitrification method is efficient, does not need a catalyst, can be carried out under normal pressure, eliminates adverse effects of O2, CO2 and H2O in actual flue gas on NTP method denitrification, is high in desulfurization efficiency, is not easy to cause secondary pollution, and enables NO and SO2 to be efficiently removed at the same time. The invention is accepted by basic scientific research business cost subsidy (project number XDJK2020C077) of central colleges and universities in 2020 and experimental technology research project subsidy (project number SYJ2020025) of southwest universities in 2020.

The invention relates to the field of environmental protection technical equipment and discloses a flue gas desulfurization and denitration device. The flue gas desulfurization and denitration deviceat least comprises a first reaction bed filled with a desulfurization material, a second reaction bed filled with a denitration material and a vacant third reaction bed, wherein the first reaction bed, the second reaction bed and the vacant third reaction bed are sequentially arranged at intervals along a flue gas flow channel in an initial state. When the desulfurization material in the first reaction bed reacts with flue gas to reach a saturated state, the first reaction bed can form a vacant state, the third reaction bed can be configured to be filled with the denitration material, and thesecond reaction bed can be configured to be filled with the desulfurization material; and when the desulfurization material in the second reaction bed continuously reacts with the flue gas to reach asaturated state, the first reaction bed can be configured to be filled with the desulfurization material, and the second reaction bed at least can form a saturated state. The flue gas desulfurizationand denitration device disclosed by the invention can realize efficient desulfurization and denitration of the flue gas and is more economical for the treatment of the flue gas.

The invention relates to a novel biomass boiler flue gas desulfurization and denitrification integrated system. Specifically, a flue gas desulfurization and denitrification reaction part of the systemcomprises a reactor, an air blower, a water tank, a water feeding pump and a quick lime storage tank which are connected in parallel. The circulating operation of the system depends on monitoring ofa Ca(OH)2 concentration meter, a water flow meter, an air flow meter, a thermometer and a NOx concentration meter in the reactor so as to set a proper alternate operation period, and the solid-liquidseparation device is used for separating and recycling reacted substances of the reactor which finishes the period and suspends operation, so that the economic cost is reduced while the operation lifeof a unit is prolonged. The system is assisted by a waste heat recovery device, so that the heat of the purified low-temperature flue gas is further utilized to improve the economic benefit of the equipment, and a good reference is provided for research and application of environment-friendly and efficient biomass boiler flue gas purification treatment equipment.

The invention relates to the technical field of gas purification, and in particular, relates to a solid waste incineration flue gas desulfurization and denitrification process, wherein the process comprises the steps: cooling high-temperature flue gas generated by solid waste incineration, spraying alkali liquor, introducing the treated flue gas into desulfurization and denitrification equipment, filling desulfurization and denitrification equipment with a pre-activated adsorbent, and demisting the flue gas treated by the adsorbent to obtain purified flue gas. Tests show that the solid waste incineration flue gas desulfurization and denitrification process can greatly reduce sulfur-containing and nitrate-containing gases in the flue gas generated by solid waste incineration, and has excellent purification efficiency, the desulfurization efficiency is greater than or equal to 98%, and the denitrification efficiency is greater than or equal to 86%.

The invention relates to a three-stage flue gas low-temperature combined desulfurization and denitrification system and a method thereof, one end of a desulfurization reactor is communicated with a flue gas cooler, and the other end of the desulfurization reactor is sequentially communicated with a demister, a carbon-based adsorbent pretreatment reactor, a flue gas reheater and a denitrification reactor in the flue gas inflow direction. According to the three-stage flue gas low-temperature combined desulfurization and denitrification system and method provided by the invention, flue gas is subjected to graded synergistic desulfurization and denitrification after being cooled, so that the problem of high-temperature ignition is avoided, the NO adsorption performance of a carbon-based adsorbent is improved, the desulfurization effect of the carbon-based adsorbent is greatly improved, and the SO2 removal efficiency in the first-stage reactor reaches 99% or above; the adverse effect of SO2on NO removal in the downstream reactor is avoided, the risk that the generated NH4HSO4 blocks the surface pores of the carbon-based adsorbent is reduced, the NO removal rate in the third-stage reactor achieves more than 90%, the efficient desulfurization and denitrification is achieved while the partial pollutants such as heavy metals, VOCs and the like can be synergistically removed, the structure is simple, and the application prospect is broad.

The invention discloses a flue gas two-stage segmented desulfurization and denitrification system and method, and belongs to the technical field of air pollution control. NO and SO2 in the flue gas are oxidized into NO2 and SO3 through sodium chlorite, the NO2 and SO3 are absorbed and converted into magnesium nitrate and magnesium sulfate solutions through magnesium hydroxide, the oxidation absorption process is ordered and crossed in a graded and segmented manner, and the purpose of efficient desulfurization and denitrification is achieved. By means of flue gas waste heat evaporation and purified flue gas desulfurization and denitrification liquid escape washing gas recovery, a closed-loop circulation system without solid waste and wastewater discharge and with system water balance is realized on the premise of flue gas ultra-clean discharge, and desulfurization science is combined on the basis of overcoming the technical problem of flue gas low-temperature denitrification, so that desulfurization and denitrification complement each other, and the method has great guiding significance in treating low-temperature desulfurization and denitrification flue gas.