Coal-fired power plant smoke gas circulating adsorbent demercuration device and demercuration method

Abstract

The invention discloses a coal-fired power plant smoke gas circulating adsorbent demercuration device and a demercuration method, and belongs to the technical field of smoke gas purification. Circulating demercuration adsorbent magnetic active carbon is ejected into a flue behind an air pre-heater through a gas conveying device, the magnetic active carbon adsorbs mercury in the smoke gas, and then the magnetic active carbon and ash are trapped by an electric dust remover, are screened by a multi-stage magnetic separator and enter a conical separator to finish separation of the magnetic active carbon and magnetic substances in the ash, and the recycled magnetic active carbon enters an ejecting device again; and after circulation is conducted for a certain time, the magnetic active carbon enters an adsorbent regeneration device to desorb mercury, and the regenerated magnetic active carbon enters an adsorbent ejecting system to be recycled. By the method, on the basis that coal-fired power plant smoke gas purification equipment is not changed, the mercury removing efficiency is high, the adsorbent can be recycled, the cost is reduced, and the problems about the influence of the adsorbent on the fly ash quality and secondary release of the mercury are solved.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification in coal-fired power plants, and in particular relates to a mercury removal device and method for flue gas circulation adsorbents in coal-fired power plants. Background technique [0002] Mercury is a neurotoxic substance, and its pollution is global, persistent, and bioaccumulative, and it is extremely harmful to human health. Coal-fired power plants are the main source of anthropogenic mercury emissions, and mercury removal from flue gas from power plants has become a research hotspot in the field of power environmental protection in recent years. There are three main forms of mercury in the flue gas of coal-fired power plants: particulate mercury Hg p , Divalent mercury Hg 2+ , elemental mercury Hg 0 , where Hg p and Hg 2+ It is easy to be effectively removed by wet desulfurization and other devices, while Hg 0 Volatile, insoluble in water, and difficult to be removed, it is ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a mercury removal device and method for flue gas circulation adsorbent in a coal-fired power plant. The device and method of the present invention are based on the addition of an adsorbent injection system and a magnetic separation system without changing the existing equipment of the power plant. And regeneration system, using the magnetic separation characteristics of magnetic activated carbon, recycling adsorbent to remove mercury, the present invention aims to solve the problem of high cost of mercury removal technology in existing coal-fired power plants, affected fly ash quality, existing equipment is corroded, mercury secondary issue of release

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