Smoke gas catalysis adsorption cooperated demercuration device and method

Abstract

The invention provides a smoke gas demercuration method and device. According to the method, a demercuration catalyst and flue jet adsorption agent cooperated technology is used for efficient demercuration, wherein a demercuration catalyst layer is arranged at the upper stream of a denitration and ammonia spraying grille or / and the lower stream of the smoke gas denitration catalyst layer; adsorption agents are sprayed in the upper stream flue of a dust removing device; most Hg<0> in the smoke gas is converted into Hg<2+> under the effect of the demercuration catalyst and is sufficiently and uniformly mixed with the adsorption agents entering the smoke gas through spraying; reaction adsorption is performed; then, the adsorbed mercury is removed along with particle materials in the dust removal equipment; the unadsorbed mercury is further adsorbed in the absorption device, so that the mercury in the smoke gas can be effectively controlled. The smoke gas demercuration method provided by the invention has the advantages that the process is simple; the operation is convenient; the demercuration rate can reach 94 percent.

Description

[0001] Technical field [0002] The invention relates to a flue gas catalytic adsorption and coordinated mercury removal device and a method thereof, belonging to the fields of power plants, metal smelting, cement, chemical industry, petroleum refining and the like. Background technique [0003] Many air pollutants such as SOx, NOx, dust, mercury, etc. are generated during the combustion and utilization of energy. Among them, mercury, as a heavy metal pollutant, causes significant harm to the environment and human health. Coal-fired power plants, coal-fired industrial boilers, non-ferrous metal smelting, and cement industries are the main sources of mercury emissions in my country, accounting for more than 80% of mercury emissions in the entire industry. [0004] Due to the low chlorine content in coal in our country, most of the mercury in the coal combustion process is the gaseous element mercury (Hg 0 ) Into the flue gas; as the flue gas cools, part of the Hg 0 Interacting with ot...

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Problems solved by technology

[0006] However, on the surface of commonly used SCR catalysts, NH 3 Competitive adsorption with Hg on the active center site, NH 3 The adsorption of mercury is often dominant, which can inhibit the adsorption of Hg, and these catalysts are highly dependent on the chlorine content in the flue gas when oxidizing mercury. When there is no chlorine or less chlorine in the flue gas, the mercury oxidation ability of these catalysts is significantly reduced, while the Hg in mercury 0 Compared to Hg 2+ Also more difficult to convert to Hg p , which limit the ability of subsequent dedusting unit and wet absorption unit to synergistically remove mercury

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