With the development of industry, the air pollution caused by sulfur dioxide and its harm have increasingly become the environmental problems that people are concerned about. Therefore, the control of sulfur dioxide emissions from coal-fired boilers is of great significance for controlling air pollution and improving the ecological environment. The following Xiaobian desulfurization methods and their comparison for a brief introduction. Differentiated by the point of combination with combustion, desulfurization methods are: a. Pre-combustion desulfurization - ~ coal desulfurization; b burning desulfurization - furnace desulfurization; After burning desulfurization ---- flue gas desulfurization. By desulfurization after the absence of pay-off product recycling method and recycling law. 1 coal desulfurization Flotation method for industrial applications, there are: magnetic separation, bacterial treatment, caustic leaching and other methods only for the removal of inorganic sulfur; microwave radiation, solvent extraction, thermal decomposition, acid-base treatment, redox treatment, Nuclear dislodging method can simultaneously remove organic sulfur and inorganic sulfur, of which strong magnetic separation and microwave radiation more attention. 1. Mechanical sorting (MF) The use of coal and ash in different proportion of inorganic sulfur, flotation flotation, water flotation agent. 2 strong magnetic separation method (HMS) The use of strong magnetic field of coal paramagnetic inorganic sulfur and diamagnetic coal separation. 3. Microwave Radiation Method (MCD) Irradiation of electromagnetic waves with water or alkali or ferric chloride treatment of 50 ~ 100 ℃ pulverized coal can make the pulverized Fe-S and C-S and other chemical bonds resonance cleavage, the formation of free sulfur with Hydrogen and oxygen react to generate hydrogen sulfide, sulfur dioxide and other gases, escape from the coal, the gas will be collected to deal with, you can get the sulfur to pay the product. 2 furnace desulfurization 1, limestone injection furnace staged combustion (LIMB) In order to inhibit the nitrogen dioxide, and later developed into a spray of calcium, using a suitable heating surface arrangement, the furnace temperature can be controlled at 850 ~ 950 ℃, thus inhibiting the nitrogen dioxide. When the Ca / S ratio is 2, the desulfurization efficiency is about 50% at the same time. Using limestone and hydrated lime as desulfurizer, the desulfurization efficiency is 32 and 44% when the Ca / S molar ratio is 2. The law applies to the old factory transformation. 2. Injected limestone and activated calcium oxide LIFAC The limestone in the boiler around the 1150 ℃ injection, calcium carbonate quickly decomposed into calcium oxide, while playing some role in sulfur fixation. In the tail of the flue the appropriate parts (usually in the air preheater and dust collector) to set the humidification activation reactor, the unreacted calcium oxide into calcium hydroxide, further desulfurization, the total desulfurization rate of 70%. Pressure digestion of lime instead of limestone, can be further improved desulfurization agent utilization and desulfurization efficiency; Ca / S-l, 5, the desulfurization rate of 80%. This is because, with pressurized hydration, the hydrate bursts during rapid discharge, forming highly dispersed particles that are both good for direct dusting and have the highest rates of desulfurization. However, the law can not simultaneously remove nitrogen dioxide, the law applicable to the old factory transformation. 3 flue gas desulfurization (FGD) In accordance with the state of treatment is divided into two categories of dry and wet. 1, Dry process - most of the desulfurization process is a gas-solid reaction, the speed is relatively low, flue gas flow rate in the reactor is slower, extending the reaction time, so the equipment is large, but the flue gas desulfurization less or no cooling Cooling, so no longer need to heat (less energy), to meet the emission requirements of diffusion. In addition, less secondary pollution, no scaling, clogging, high reliability. (1) BF moving bed activated carbon desulfurization (BF / FW) Activated carbon for desulfurization agent in the desulfurization moving bed with about 100 ℃ flue gas cross-flow contact to remove sulfur dioxide, desulfurization rate of 90%. Activated carbon adsorbed sulfur dioxide in the regenerated moving bed with 500 ~ 600 ℃ hot sand (or other heat load) body coke, carbon dioxide is reduced to sulfur dioxide escape for sulfuric acid, ammonia added to the flue gas treatment with bunk beds , Can simultaneously remove 80% of nitrogen dioxide. Military Tent House,Old Army Tent,Temper Tents,Army One Man Tent Ocp Bestway Industries (Group) Co., Limited , https://www.military-tents.com