Method for controlling discharge of superfine particulate matters of fire coal

Abstract

The invention relates to a method for controlling the discharge of superfine particulate matters of fire coal. The method comprises the following steps of: grinding a Mn-base desorption agent into granules of which the grain diameters are 54 to 105 micrometers, and mixing the Mn-base desorption agent with the fire coal, wherein the addition amount of the Mn-base desorption agent is 3 to 6 weight percent of the fire coal amount, and the Mn-base desorption agent is a mixture of MnO2, Mn3O4 and Mn(OH)2 or MnCO3 or MnO2, Mn3O4 and Mn(OH)2 or MnCO3; grinding the fire coal in a coal grinding machine, conveying the ground fire coal into a boiler hearth, conveying the Mn-base desorption agent into the boiler hearth with secondary air from a secondary tuyere of a boiler for combusting, and conveying air required by combustion into the boiler hearth by a forced draught blower; and allowing smoke which is formed after combustion and is mixed with the Mn-base desorption agent to enter a deduster, filtering and discharging. By the method, the high-temperature corrosion of alkali metal sodium and potassium on a boiler superheater or a boiler reheater can be reduced effectively; and harmful heavy metal elements can be removed from the smoke while particulate matters (PM) 2.5 are removed.

Description

technical field [0001] The invention relates to coal-fired flue gas treatment technology, belongs to the technical field of environmental pollution prevention and clean coal combustion, and specifically relates to a method for controlling the emission of coal-fired ultrafine particles. Background technique [0002] Pulverized coal combustion provides us with the necessary heat and power resources, but at the same time, it also produces serious environmental pollution. Although power plants have installed high-efficiency dust removal equipment, they have a high collection efficiency for large-size particles that account for a large proportion of mass, but the collection efficiency for the large number of ultrafine particles in fly ash is not high, especially for submicron The collection efficiency of particles will be lower, resulting in a large amount of ultra-fine particles being directly discharged into the atmosphere. Coal-burning ultra-fine particles have become one of th...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems in the prior art such as the high-temperature corrosion generated in the combustion process of pulverized coal, the explosion of the boiler superheater or reheater, and the unsatisfactory dust removal effect of pulverized coal combustion, the present invention provides a coal-fired ultrafine particle Emission control method, which can effectively control ultrafine particulate matter from coal combustion, especially PM 2.5 Particle emission, reduce environmental pollution, reduce harm to human health, and improve the removal efficiency of traditional dust removal devices for coal-fired ultrafine particles

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