Limestone-wet flue gas desulfurization defoaming method for thermal power plant based on desulfurization defoaming agent

Abstract

The invention belongs to the technical field of flue gas desulfurization, and discloses a limestone-wet flue gas desulfurization defoaming method for a thermal power plant based on a desulfurization defoaming agent. The method comprises the following steps: recording FGD related operation parameters under the working condition of relatively stable operation load, and starting the addition work ofa special defoaming agent for experimental desulfurization after 4 hours; under the conditions that the desulfurization rate is qualified and the PH value is 5.0-5.6, the running number of the slurrycirculating pumps is kept; determining the feeding amount of the defoaming agent according to the operation conditions such as the inlet flue gas amount, the flue gas dust content, the boiler oil feeding amount, the inlet SO2 concentration and the like of the desulfurization system; and adding 0.5-3kg of the special defoaming agent for desulfurization into the pit, stirring for 5-10 minutes, and pumping into an absorption tower through an absorption tower pit pump. The defoaming agent is mainly applied to defoaming of limestone slurry in limestone-wet flue gas desulfurization absorption towersof thermal power plants, municipal coal-fired heat supply units, steel mills and coking plants.

Description

technical field [0001] The invention belongs to the technical field of YC-503 desulfurization special defoamer in limestone-wet flue gas desulfurization technology field of coal-fired power plant, especially relates to a limestone-wet flue gas desulfurization and defoaming method of thermal power plant based on desulfurization defoamer, specifically a A defoaming method for limestone-wet flue gas desulfurization absorption tower limestone slurry in thermal power plants (municipal heating units, steel plants and coking plants) based on a special defoamer for desulfurization. Background technique [0002] At present, the limestone-wet flue gas desulfurization technology of the existing coal-fired power plants (municipal heating units, steel plants and coking plants) is as follows: due to the SiO contained in the coal 2 Due to insufficient combustion of particles and pulverized coal, oily substances entering the absorption tower, and oil injection during the combustion process,...

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Problems solved by technology

[0004] (1) SO2 does not react with limestone and escapes directly with flue gas, resulting in a decrease in desulfurization efficiency and even SO2 emissions exceeding the standard

[0005] (2) Severe fouling of GGH and demister, reduced flue gas flow area, increased wind resistance and pressure difference, which will cause blockage of GGH and demister and equipment safety hazards in serious cases, forcing the generator set to reduce load, and even cause The desulfurization system tripped and the generator set was forced to shut down

[0006] The difficulty in solving the above technical problems lies in: (1) The flue gas desulfurization systems of domestic thermal power plants (thermal units, steelmaking plants and coking plants) all adopt the limestone-wet desulfurization production process. The biggest defect of this production process is that it cannot solve the problem of limestone Serum Foaming Problems

[0007] (2) The hidden dangers of production safety and excessive environmental protection emissions caused by limestone slurry foaming cannot be solved at present

[0008] (3) Due to the high flue gas temperature, large flue gas volume, complex causes of foaming, irregular foaming, large foaming volume, and fast foaming speed, the damage caused is relatively serious. The existing technology cannot dynamically analyze and detect the absorption tower. The foaming process of the internal limestone slurry, the current domestic desulfurization system cannot eliminate the above problems, and there is no corresponding technology that can solve the above problems

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