The operational performance

existing problems

and corresponding improvement measures of 135 MW class circulating fulidized bed （CFB） boiler have been presented

it is considered that the quality variation of coal sorts has influence upon safe and economic operation of CFB boiler

needing to pay close attention; resonable adjustment of particle size gradation for as-fired coal according to the coal quality is an important means for ensuring normal operation of CFB boiler. Under condition

in which the quality of coal can’t be varied. it is need to use drum type slag-cooler which isn’t sensible to pay ticle size of ash and slag for replacing the originally designed slag-cooler with air and water cooling combination.