Aiming at the problems of high bed temper-ature and large concentration of NOx emission in a 200MW circulating fluidized bed boiler

the boiler is studied in this paper:the experimental analysis is carried out re-spectively from adjustment of fluidizing air volume

running oxygen rate

ratio of up and down secondary air and bed pressure.The experimental results show that with the in-crease of fluidizing air

the bed temperature and NOx emis-sion increased significantly;With the increase of running oxy-gen

bed temperature decreased significantly

NOx emissions increased significantly;Properly reducing the bed pressure and closing the opening of the lower secondary air register can effectively reduce the bed temperature and inhibit the formation of NOx.Through a vari

ety of combustion adjust-ment means

the NOx emission concentration under three loads can be controlled below 240mg/m

3

.