RESEARCH OF FINE PM POLLUTION FROM THE CFB COAL COMBUSTION

摘要

An important environment issue is emission of particulate matter (PM) and contamination from coal-fired power plant. The sampling and analysis system of PM emitted from circulating fluidized boiler (CFB) combustion were established, and experiments were performed in a 0.5MW CFB combustion test facility and a CFB power plant. We obtain the PSD of fly ash at inlet and outlet of ESP, efficiency of the ESP, the characteristic of heavy trace metals and PAHs absorbed in the PM. For fine particles (PM2.5), capture efficiency of the ESP is relatively low (91.4%), which emits some fine particles into the atmosphere directly and form primary pollution. Capture efficiencies of the ESP were 96.6% to total PM, with average 94.3% to PM10 and 91.4% to PM2.5. Several trace metals concentration in PM such as Ni, Cr, Cu, Cd, Pb, Hg was analyzed with AAS after acid digestion with different size distributing. Such characteristic attributes to the coal composition, combustion condition, element volatility during combustion and so on.