Safety and Economic Analysis of Sludge Mixed Combustion in a 1000 MW Coal-fired Boiler
A 1 000 MW coal-fired boiler experienced a decrease in efficiency due to the long-term mixed combustion of sludge and lignite.During boiler inspections,slagging was found on the water walls near the burners and the first-stage superheater tube panels.To improve the boiler efficiency and solve the problem of slagging,the combustion characteristic test of common coal and sludge was carried out,and the combustion condition in the furnace was optimized by combining the pulverization system and combustion adjustment test.Results show that,the optimized combustion condition can effectively realize the combustion of ＂wind-wrapped powder＂ in the furnace,and successfully eliminate the slagging problem in the water wall area and first-stage superheater tube panels.Furthermore,for the 1 000 MW coal-fired boiler under various load conditions,a sludge mixed combustion strategy based on secondary air distribution and excess air coefficient control was proposed to further improve boiler efficiency.
coal-fired boilersludgemixed combustionslagging of heating surfaceboiler efficiency
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