Vertical flow wet-type electric precipitator and wet electric precipitation method

Abstract

The invention provides a vertical flow wet-type electric precipitator and wet electric precipitation method. The vertical flow wet-type electric precipitator comprises an annular plate, a spray humidifying layer, a flue gas uniform distribution device, a dust removing electric field area, washing and spraying layers, a plurality of insulator boxes, an atomization water tank and a process water tank, wherein the spray humidifying layer comprises a fine atomizing nozzle and a spray pipeline; flue gas sequentially passes through the annular plate, the spray humidifying layer and the flue gas uniform distribution device; the dust removing electric field area is used for blocking a baffle board of a flue gas blind area; the washing and spraying layers are arranged above the dust removing electric field area; the wet electric precipitation method comprises the following steps: a continuous manner is adopted to conduct atomization and humidification on inlet flue gas and conduct uniformly distributed optimization treatment on the flue gas; an intermittent or continuous manner is adopted to conduct sprinkling and cleaning on a dust-collecting electrode and a discharge electrode; a method of hot air sweeping is adopted to ensure insulation. The vertical flow wet-type electric precipitator and the wet electric precipitation method can effectively ensure the high-efficient and stable operation of the vertical flow wet-type electric precipitator, optimize the fluid field, and strengthen turbulence and atomization of the flue gas; local micro-mixing, and collision as well as crash coagulation of fine particles are promoted; the dust removal efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment methods, in particular to a vertical flow wet electrostatic precipitator and a wet electrostatic precipitator. Background technique [0002] my country's coal-based energy structure will not change for a long time. So far, the basic methods of pollutant control in thermal power plants in my country mainly include: low-nitrogen combustion + SCR denitrification + dry dust removal + wet desulfurization. The existing control methods have low capture efficiency for PM2. For GGH units, the phenomenon of "gypsum rain" or "blue / yellow smoke" often appears at the chimney outlet, causing secondary pollution to the environment. [0003] In order to solve these problems, under the current conditions of my country's electric power environmental protection, it is necessary to adopt the deep purification technology of smoke and dust to improve the efficiency of dust removal, so as to effectively remov...

AI Technical Summary

Problems solved by technology

[0006] When the wet electrostatic precipitator and the desulfurization tower are integrated, there are disadvantages such as high tower body, difficult construction and maintenance, etc., and there may be mutual influence between the desulfurization section and the wet electric section. The desulfurization tower must also be shut down at the same time, and the desulfurization tower must also be shut down when there is a problem with the wet electrostatic precipitator, which increases the risk of system operation to a certain extent; The tower diameter of the front-end desulfurization tower is too large or too small. Due to the air leakage rate, complex structure and load problems of the wet electrostatic precipitator in the top-mounted tower, the integrated layout of the same tower increases the cost and even makes it difficult to arrange.

At the same time, there is still room for improvement in the flue gas treatment capacity and the removal efficiency of fine particles in the existing wet electrostatic precipitator

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