Integrated control method capable of simultaneously removing inhalable particles and heavy metal from fire coal

Abstract

The invention relates to an integrated control method for simultaneously removing respirable particle substances and heavy metal in fire coal. The integrated control method is characterized in that fly ash residual carbon having good adsorption effect on the heavy metal is sprayed in the front end of a bag type filter to remove heavy metal mercury in fire coal flue gas; meanwhile, ferrum series oxides with catalysis are sprayed in lime and the fly ash to remove sulfur oxide, and the like in the fire coal flue gas in a fluid bed reactor; filter materials of the bag filter are made of carbon-doped fibers and can effectively remove the heavy metal mercury in the fire coal flue gas for the second time, thereby achieving the aim for simultaneously removing the respirable particle substances and the heavy metal in the fire coal flue gas. The method can remove PM2.5 level, particularly finer micrometer and nanometer respirable particle substances with the removal rate up to more than 98 percent, and can remarkably control the emission of the heavy metal mercury in the fire coal flue gas; the integrated control process is simple in operation, safe in running, remarkable in environment benefit, small in occupied area of the device and low in process cost.

Description

technical field [0001] The invention belongs to the technical field of coal-fired flue gas purification and dust removal, and in particular relates to an integrated control method capable of simultaneously removing coal-fired inhalable particulate matter and heavy metal mercury. Background technique [0002] Atmospheric inhalable particulate matter has become a prominent problem of atmospheric environmental pollution, and it has increasingly attracted great attention from all countries in the world. Coal is the main fuel for power stations in China at present and for a long period of time in the future. While pulverized coal combustion provides the necessary heat and power resources, it will also bring serious pollution of inhalable particulate matter. According to statistics: in 2005, the total amount of inhalable particulate matter emitted by my country's coal-fired power plants accounted for 1.2-1.5% of the coal used for power generation, about 63,400-79,200 tons. The in...

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Problems solved by technology

[0005] At present, most of the flue gas purification technologies used for coal combustion, such as flue gas dedusting, flue gas desulfurization, flue gas denitrification, and heavy metal removal, are mostly independently developed to form their own technical systems and technological processes. In coal-fired power plants, in order to remove particulate matter and heavy metals in coal-fired flue gas, most of them use at least two sets of independent dust removal systems. This kind of flue gas purification system has the disadvantages of large equipment footprint, high investment cost, and complicated operation. and other shortcomings

In terms of heavy metal removal, most dust collectors currently use activated carbon injection technology. Although this technology has a significant effect, the operating costs associated with this process (mainly the cost of activated carbon) are relatively high, and it has become a further popularization and application of this technology. obstacles

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