Diagnosis and optimal adjustment tests for pulverizing system of a 600 MW unit boiler after using mixed inferior coal as the fuel was performed

and the unit comprehensive economy before and after the adjustment were compared.The results showed that

pretty small coal particle size and insufficient coal mill output were the major factors affecting the pulverizer's capacity.After the optimization

the coal mill capacity increased from ~50 t/h to above 65 t/h

indicating the coal mill capacity was dramatically improved and the unit realized running at full load condition.Although the slag carbon content had a slight increase

the boiler efficiency decreased by 0.27% and the standard coal consumption for power generation increased by 0.9 g/(kW·h)

the electricity consumption of coal pulverizing per unit reduced by 17.4% and the standard coal consumption for power supply decreased by 2.4 g/(kW·h).The total economic benefit increased obviously.