CHARACTERISTICS AND COMPOSITION OF PARTICULATE MATTER FROM COAL-FIRED POWER PLANTS

摘要

Measurements of the characteristics of particulate matter (PM) were performed at the inlet and outlet of the electrostatic precipitators (ESP) of four boilers in two full-scale pulverized coal power plants. PM was collected with a 13 stages Low-Pressure-Impactor(LPI) having aerodynamic cut-off diameter ranging from 10.0 to 0.03μm for a size-segregated collection. The properties of PM included its concentration, mass size distribution, emission characteristics, percent penetration of PM through ESP and elemental composition were investigated. The Experimental results indicate that, in all the cases the mass size distribution of PM10 had typical bimodal. PM1 contained up to 1.15% percent of the total particle (TP) generated in the boilers. PM2.5 contained about 2%-7% percent of the TP and PM10 contained about 4%-19% percent of the TP. When additive limestone used to desulphurization as sorbent passed into boiler, besides PM generated from coal combustion, there were new PM generated from limestone. Penetration as a function of particle diameter had a clear peak in particle size range of 0.2-0.6μm. Particles in the submicronmeter size range were much more difficult to collect with ESP than larger particles.