Discharge control method for ultrafine particles of fire coal

Abstract

The invention relates to a discharge control method for ultrafine particles of fire coal, which comprises the following steps of: mixing a Ba-based stripper with the fire coal, wherein the addition of the Ba-based stripper is 3-6 weight percent the amount of the fire coal, the Ba-based stripper is BaO, Ba(OH)2, BaCO3 or Ba(HCO3)2, and the particle size is 50-100mum; delivering the Ba-based stripper and the fire coal into a coal pulverizer together; pulverizing the coal; and evenly mixing pulverized coal with the Ba-based stripper; delivering a mixture of the ground pulverized coal and the Ba-based stripper into a boiler hearth for combustion, wherein air required by the combustion is fed into the boiler hearth by an air feeder; filtering smoke generated after the combustion is finished after entering a filter and then discharging the smoke. The discharge control method for the ultrafine particles of the fire coal has a simple process flow and is capable of effectively controlling the discharge of the ultrafine particles of the fire coal; the stripper is also capable of stripping harmful heavy metal elements from the smoke while stripping the ultrafine particles of the fire coal; and the stripper is lower in price and is capable of effectively reducing investment cost and operating cost.

Description

technical field [0001] The invention relates to coal-fired flue gas treatment technology, in particular to a kind of coal-fired ultrafine particulate matter, especially PM with a particle size of less than 2.5 μm 2.5 Particulate emission control methods. Background technique [0002] Combustion of pulverized coal 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 Particles would be collected less efficiently, resulting in large amounts of ultrafine particles being emitted directly into the atmosphere. Coal-burning ultrafine particulate matter has become one of the main sources of atmospher...

AI Technical Summary

Problems solved by technology

Since its separation mechanism is based on inertial separation, the separation efficiency is high for particles with larger particle sizes, but its separation ability is very low for micron and submicron particles

[0006] The removal efficiency of electrostatic precipitator and bag dust collector is relatively low for ultrafine particles. Although these ultrafine particles have a small particle size, they have a high number concentration and a large specific surface area, so they are easy to absorb and accumulate a large amount of toxic pollutants. Heavy metal elements will cause great harm to the environment and human body

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