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Dry desulfurization, also called dry flue gas desulfurization, refers to the use of powdery or granular absorbents, adsorbents or catalysts to remove sulfide-containing gases in flue gas.
Definition of dry flue gas desulfurization: CaCO3 sprayed into the furnace is calcined and decomposed into CaO at high temperature, and reacts with SO2 in the flue gas to form calcium sulfate; the electron beam irradiation or activated carbon adsorption is used to convert SO2 to ammonia sulfate or sulfuric acid, collectively referred to as dry French flue gas desulfurization technology.
Advantages and disadvantages It has the advantages of simple process, no sewage and sewage treatment problems, low energy consumption, especially the higher temperature of the flue gas after purification, which is beneficial to the diffusion of chimney exhaust gas, and does not produce "white smoke" phenomenon. The flue gas does not require secondary heating and is less corrosive; its disadvantages are low desulfurization efficiency, large equipment, large investment, large floor space, and high operating technology requirements.
The dusty flue gas coming out of the air preheater of the boiler first enters the electric precipitator, removes 85% of the dust in the electric precipitator, and then enters the desulfurization reaction tower. The flue gas enters the desulfurization reaction tower from the bottom, and accelerates into the circulating fluidized bed through the acceleration of the venturi tube. The material is in the circulating fluidized bed, and the gas-solid phase generates intense turbulence and mixing due to the flow of air, which makes full contact In the process of ascent, the agglomerates are continuously formed to return downward, and the agglomerates are continuously disintegrated in the fierce turbulence and re-lifted by the airflow, so that the sliding speed between the gas and the solid can reach dozens of the sliding speed of the single particle. Times. Such a gas-solid two-phase flow mechanism in a circulating fluidized bed greatly enhances the mass and heat transfer between the gas and the solid, and provides a guarantee for achieving a high desulfurization rate. A set of water spraying device is set at the outlet expansion section of Venturi, spraying atomized water to reduce the smoke temperature in the desulfurization reactor, and reducing the smoke temperature to about 75 ° C above the dew point of the flue gas, so that SO2 and Ca (OH) The reaction of 2 is transformed into an ionic reaction that can be completed instantaneously. After the flue gas comes out of the desulfurization tower, it enters the bag filter. In the bag filter, the dust in the flue gas is removed. After desulfurization and dust removal, the flue gas is discharged into the chimney through the boiler fan. The solid particles captured by the baghouse dust collector enter the ship-type ash hopper under the dust collector and pass through the material circulation system under the dust collector to return to the reaction tower. The unreacted desulfurizing agents entrained in these ash continue to participate in the reaction, and so on. The ash in the ship-type ash hopper is controlled in a certain level, and the excess desulfurized ash is sent to the desulfurized ash warehouse by the pneumatic conveying system.