Coal-fired power plant coal dust prepared activated coke flue gas comprehensive purification system and technology

Abstract

The invention relates to a coal-fired power plant coal dust prepared activated coke flue gas comprehensive purification system and a technology. The technology provided by the invention comprises the following steps of: using coal dust in a coal-fired power plant as a raw material, simultaneously carrying out carbonization and activation on coal dust in an activated coke preparation reactor to obtain powdered activated coke, using pyrolysis gas obtained during the preparation process as reburning fuel and sending it into a boiler so as to remove part of NOx; sending the powdered activated coke into a flue gas adsorption tower, adsorbing pollutants such as sulfur dioxide, mercury and the like at an appropriate temperature, injecting ammonia gas and nitrogen oxide to perform a catalytic reduction reaction so as to remove nitrogen oxide; reusing the adsorbed activated coke after regeneration; sending the activated coke into the boiler for combustion after multiple adsorption/regeneration; regenerating the activated coke after adsorbing sulfur dioxide to obtain high-density sulfur dioxide gas to realize resource utilization. By the utilization of coal resources in a coal-fired power plant, the comprehensive purification of flue gas and the resource utilization of sulfur dioxide are realized without discharge of waste water, exhaust gas and solid waste.

Description

technical field [0001] The invention relates to a flue gas pollution control technology, in particular to a comprehensive flue gas purification system and process for preparing active coke from pulverized coal in a coal-fired power plant. Background technique [0002] At present, the problems of air pollution and acid rain caused by flue gas pollutants discharged from coal-fired power plant boilers have become very serious, causing huge economic losses, and it is imperative to control the emission of flue gas pollutants. At present, domestic power plants generally adopt limestone / gypsum wet flue gas desulfurization technology and circulating fluidized bed semi-dry flue gas desulfurization technology. Both of these two desulfurization technologies use calcium-based absorbents (calcium carbonate, calcium oxide or calcium hydroxide) as desulfurizers, which consume a large amount of calcium carbonate resources, resulting in massive mining of limestone resources, and desulfurizat...

AI Technical Summary

Problems solved by technology

At present, the most widely used activated carbon desulfurization and denitrification process mostly adopts fixed bed or moving bed adsorption process, but there are disadvantages in the application process of activated carbon, such as low utilization rate of activated carbon, high system operating cost, large space occupation, and high initial investment, which hinder activated carbon desulfurization. Popularization and application of denitrification process

The applicant invented a fluidized activated carbon combined desulfurization and denitrification process, and applied for an invention patent in 2010 with the application number 201010189427.2, but the high price of powdered activated carbon is still a limiting factor for the application of this process

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