Directing against the problems occurred on one CFB boiler of 300 MW unit in Midong Thermal Power Plant

such as high bed temperature

non-uniform temperature in the furnace

and low ash concentration in the dilute-phase zone etc.

a combustion adjustment test has been carried out in aspects of total air

fluidizing air

particle size of coal entering into the furnace

secondary air at upper and lower levels

bed pressure

and coal-spreading air etc..Results show that the measures taken

including increasing the particle size of coal entering into the furnace

increasing the total air

adjusting the proportioning ratio of primary and secondary air etc.

can make the average bed temperature to decrease from 940 ℃ before adjustment to 910~920 ℃

and making the thermal efficiency of boiler to reach 92.15%

boasting remarkable effectiveness.