Contact: Fu Manager, 15036196719, Gongyi City, Henan Province, high-speed intersection, Zhengzhou Zhongzhou Coal Machinery Factory, ball press, desulfurization gypsum ball press, briquette ball press, mine powder ball press, coke end ball press
(4) Desulphurization of seawater: This process utilizes the alkalinity of seawater to absorb sulfur dioxide in the flue gas. This process has no secondary products without secondary pollution, and the desulfurization rate can reach above 90c70. The effect of seawater desulfurization is greatly affected by the salinity of seawater. The salinity of seawater in the freshwater sea is difficult to meet the requirements, and the salinity of seawater is also affected by the season. In general, the absorption capacity of seawater for S02 is very limited. When the sulfur content in the flue gas is high, the amount of seawater required for desulfurization is too large, so that the investment in seawater desulfurization system is greatly increased. Therefore, the seawater desulfurization process is only suitable for low sulfur. Coal flue gas desulfurization.
(5) Spray drying desulfurization (LSD method): The principle of the process is to use lime as a desulfurization absorbent, lime is digested and water is added to make slaked lime milk, and the slaked lime milk is pumped by an atomizing device located in the absorption tower. Inside the tower, it is atomized into fine droplets. The sulfur dioxide in the flue gas reacts with the lime milk in the absorption tower to form CaS03, which flows out of the absorption tower with the flue gas, and is collected into the dust collector. The flue gas is discharged after desulfurization and dust removal. The process is suitable for the desulfurization of coal-fired flue gas of medium and low-sulfur coal, and the desulfurization rate can reach about 75%. Its by-products are mainly calcium sulfite, and a small amount of calcium sulfate and soot. The above five processes all desulfurize the flue gas after coal combustion, and the following two processes are sulphur sulphur during the coal combustion process.
(6) Desulfurization gypsum ball press for desulfurization of circulating fluidized bed boiler (boiler CFB): Fluidized bed combustion (CFB) boiler refers to a boiler in which small particles of coal powder and combustion air are burned in a furnace. The circulating fluidized bed boiler desulfurization process uses limestone as the desulfurization absorbent and is ground.
The pulverized coal and limestone powder are sent from the lower part of the boiler combustion chamber, and the primary air is sent from the lower part of the air distribution plate, and the secondary air is sent from the middle of the combustion chamber. The limestone powder is decomposed into calcium oxide and carbon dioxide by the heat flow, so that the coal powder and the lime powder are strongly disturbed in the combustion chamber to form a fluidized bed. The S02 in the coal-fired flue gas reacts with the calcium oxide to form Cas03 0 and in order to improve the utilization rate of the absorbent, Unreacted calcium oxide, desulfurization products and fly ash are sent back to the combustion chamber for recycling. The process is more suitable for the desulfurization of coal-fired flue gas of medium and low-sulfur coal, and the desulfurization rate can reach more than 90%. Its by-products are mainly calcium sulfite and a small amount of calcium sulfate, and by-products are discharged together with fly ash.
(7) Calcium in the furnace and humidification activated desulfurization (LIFAC method): The process uses limestone powder as the absorbent, and the limestone powder is sprayed into the furnace at a temperature range of 850-1150 °C, and is decomposed into calcium oxide and carbon dioxide by heat. Calcium oxide reacts with sulfur dioxide in the flue gas to form calcium sulfite. Since the reaction proceeds between the gas-solid phases, the reaction rate is slow and the absorbent utilization rate is low. In order to improve the desulfurization efficiency, the humidified water is sprayed in the mist at the tail, and the unreacted calcium oxide is contacted to form C8(,H)z, which further reacts with the sulfur dioxide in the flue gas to further remove the sulfur dioxide.
Because of the large amount of limestone powder (Ca/S about 2.5) injected into the boiler furnace, the amount of limestone powder required to be sprayed is too large, which affects the thermal efficiency of the boiler on the one hand and the power plant on the other hand. The ash removal system is too large, so the process is only suitable for low sulfur coal desulfurization. When Ca/S is 2.5 or more, the system desulfurization rate can reach 65% to 80%, and its by-product is mainly calcium sulfite, and a small amount of calcium sulfate, and by-products are discharged together with fly ash. All of the above flue gas desulfurization methods have applications. At present, about 85% of the world's power plant flue gas desulfurization facilities are desulfurization by wet flue gas. Among them, limestone/lime-gypsum wet desulfurization accounts for 36.79 (0, and the remaining wet method accounts for 48.3%, China's flue gas desulfurization facility. 85% of them are limestone/lime-gypsum wet desulfurization.
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