In response to the rising coal prices and the diversification of power plant coal use

a power plant has adopted fuzzy evaluation method to choose the coal blending scheme with the best comprehensive performance. In this method

the ash content

volatile matter content

calorific value

price

pollutants(SO_2

NO_x) emissions and ash melting temperature of the coal are taken as the evaluation indexes and each index's weight is determined by entropy method. The results show that

among the eight coal blending schemes proposed in this paper

the comprehensive performance of scheme 5 is the best

that of scheme 7 is the second

while that of scheme 4 is the worst. Applying the scheme 5 in test run and the result shows that

the combustion flame distribution in the furnace is concentrated

the high temperature heating surface has no coking trend

the carbon content in fly ash and slag is low

and the safety and economy of boiler operation are good

so the research result can provide guidance for commercial operation and optimization of coal blending scheme.