After putting the tittle boilers into operation. troublesome problems

such as insufficient output capacity of the coal pulverized system

low load capability of said boilers

and slagging in the furnace etc.

have been existing in a very long period of time

leading the furnace outlet flue gas temperature to be above 200℃ higher than the desighed value

and hot air temperature to reach 550℃

hence

the units can only be operated under low load condition

and the time of consecutive operation being short. Throwgh analysis and testing of the said coal pulverized system

quality of fuel coal

and combustion conditions etc. effective debugging and retrofitting have been carried out

making the said problems to be satisfactorily resolved.