Pollutant combined removal device and method through recycling of chlorine in coal

Abstract

The invention discloses a pollutant combined removal device and method through recycling of chlorine in coal. The pollutant combined removal device comprises a boiler, a SCR (selective catalytic reduction) denitration device, an air preheater, a dust remover, a desulfurization tower, a chimney, and a slurry pump II, wherein the boiler is connected with the SCR denitration device, the SCR denitration device is connected with the dust remover by the air preheater, the dust remover is connected with the desulfurization tower, and the desulfurization tower is connected with the chimney. The pollutant combined removal device also comprises a desulfurization?wastewater?storage box, an atomizing nozzle, a wastewater conditioning tank, and an air compressor, wherein the atomizing nozzle is arranged on a connection pipeline between the SCR denitration device and the air preheater and connected with the wastewater conditioning tank by the slurry pump II, the air compressor is connected with the atomizing nozzle, and the desulfurization?wastewater?storage box is connected with the desulfurization tower and the wastewater conditioning tank which is filled with strong base. The removal of mercury in fume is facilitated, meanwhile the PH value of the chlorine-rich desulfurization wastewater can be adjusted, so that the desulfurization?wastewater is effectively utilized and the removal efficiency of SO3 in fume is improved.

Description

technical field [0001] The invention relates to the technical field of oxidation, removal and deep fixation of elemental mercury in the flue gas of a limestone-gypsum wet coal-fired boiler, and the removal of pollutants such as sulfur trioxide and dust, and in particular to a realization of the recycling of chlorine in coal A device and method for joint removal of pollutants. Background technique [0002] Mercury is a highly toxic class of pollutants in the atmosphere that can cause damage to the human nervous system. Flue gas emissions from coal-fired boilers in power plants are the main source of mercury in the atmosphere. Mercury is mainly in the form of elemental mercury (Hg 0 ), oxidized mercury (Hg 2+ ) and particulate mercury (Hg P ) exist in three forms, of which oxidized mercury and particulate mercury are easily removed by conventional pollutant control equipment, and unoxidized elemental mercury is difficult to be effectively controlled due to its strong stabi...

AI Technical Summary

Problems solved by technology

Electrostatic precipitator and bag filter cannot remove this part of sulfuric acid aerosol particles, WFGD has a good effect on SO 3 The removal rate is low, which makes it difficult to remove PM2.5. It is usually necessary to add wet electrostatic precipitator (WESP) after WFGD to remove sulfuric acid aerosol particles

SO 3 Acid mist causes corrosion to downstream flue and equipment, and at the same time increases the emission of PM2.5 condensable particles

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