Equipment for performing wet-method flue gas desulfurization and producing gypsum by discarded carbide slag

Abstract

The invention discloses equipment for performing wet-method flue gas desulfurization and producing gypsum by discarded carbide slag. The equipment mainly comprises a wet-method flue gas desulfurization part, a carbide slag pretreatment part and a gypsum slurry retreatment part, wherein a hollow annular boss with a slurry spray nozzle is arranged below a slurry spray layer and on the inner wall of a spray tower cylinder body of the wet-method flue gas desulfurization part, so that the problem of flue gas 'short circuit' in the spray tower cylinder body is solved; according to the carbide slag pretreatment part, the problem of the stoppage of a filter layer in the process of separating the carbide slag slurry is solved by the design of a first rotation separator with a cleaning function; and according to the gypsum slurry retreatment part, an expensive cyclone separator in the conventional gypsum separation equipment is replaced effectively by the design of a second rotation separator with the cleaning function. According to the equipment, the flue gas desulfurization of fire coal, the comprehensive utilization of the discarded carbide slag and the processing of the gypsum serving as a desulfurization byproduct are integrated organically, and the equipment has a simple structure, is stable in running and high in desulfurization efficiency, treats wastes with the wastes and meets the requirement of current environment friendliness.

Description

technical field [0001] The invention belongs to the technology of environmental protection and resource utilization, and relates to equipment for purifying flue gas of a coal-fired power station, in particular to an equipment for waste carbide slag wet-process flue gas desulfurization and co-production of gypsum. Background technique [0002] At present, in the field of flue gas desulfurization in coal-fired power plants, wet flue gas desulfurization equipment (FGD) has been widely used because of its simple structure and reliable operation. Most of the absorbents used in wet flue gas desulfurization are limestone, usually block limestone is ground into slurry, or limestone powder is purchased directly to make slurry, and then sprayed into a straight desulfurization tower to make limestone slurry and heat A chemical reaction occurs in the flue gas to remove sulfur from the flue gas. However, limestone as a desulfurization absorbent needs to be purchased and processed, which...

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Problems solved by technology

[0003] However, carbide slag contains a large amount of impurities. When it is used in wet flue gas desulfurization, it needs to be separated by rotary separation equipment. The by-product gypsum slurry obtained by the reaction of carbide slag and flue gas also needs to be separated by rotary separation equipment. , the clogging problem of the filter layer in the two separation processes has not been effectively solved, often resulting in the continuous operation of wet flue gas desulfurization

Moreover, due to the lack of effective cleaning methods, large particles of calcium carbide slag and other impurities also seriously wear the operating equipment, which greatly reduces the service life of the equipment

[0004] On the other hand, most of the existing wet flue gas desulfurization equipment adopts a straight cylinder structure desulfurization tower, and the flue gas is prone to air short circuit in the desulfurization tower, so that at least part of the flue gas escapes without contact with the calcium carbide slag slurry , leading to low desulfurization efficiency

In order to solve this problem, researchers often use the method of increasing the concentration of carbide slag to make it fully contact with the flue gas, but this intensifies the clogging of the filter layer in the rotary separation equipment

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