Desulfurization wastewater zero-emission treatment device and method capable of collaborative demercuration

Abstract

The invention discloses a desulfurization wastewater zero-emission treatment device and method capable of collaborative demercuration, and belongs to the technical field of flue gas pollutant control.According to the device, a fly ash surface activation spraying tower is additionally arranged before an electric dust collector; fine fly ash in an ash bucket of the high-voltage electric dust collector passes through an inclined groove and enters the tower from the lower part of a throat pipe of the spraying tower; the fly ash is fluidized and moves towards the upper part of the tower under theaction of a fan at the bottom of the tower and the action of a flow field in the tower; and desulfurization waste water passes through an atomizing station and enters the fly ash surface activation spraying tower from the upper part of the throat pipe. Compared with the existing demercuration technology, the demercuration technology disclosed by the invention overcomes the defect that the operation cost of the activated carbon injection demercuration technology is high, the adsorption effect of activated fly ash on Hg<0> is effectively utilized on the basis of realizing zero emission of wastewater, and the content of Hg<0> in flue gas is reduced.

Description

technical field [0001] The invention belongs to the technical field of coal-fired flue gas pollutant control, in particular to a zero-discharge treatment method and device for desulfurization wastewater with coordinated mercury removal. Background technique [0002] Mercury emitted from combustion in coal-fired power plants is the main source of anthropogenic mercury emissions, and it is also the main field for controlling and mitigating Hg emissions. Control is imperative. At present, the control methods for Hg mainly include: mercury removal technology of existing pollutant control equipment, mercury removal technology of incoming coal additives, oxidation mercury removal technology, mercury removal technology of adsorbent and mercury removal technology of optimizing boiler operating parameters, etc. [0003] The existence forms of Hg in coal-fired flue gas are diversified. When the furnace temperature is higher than 800 °C, the mercury in coal is mostly in the form of el...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of the existing coal-fired power plant flue gas Hg emissions not up to the standard and high operating costs, and to provide a zero-discharge treatment method and device for desulfurization wastewater with coordinated mercury removal

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