An investigation and study on the present situation of bed-temperature controlling for CFB boilers have been performed. It is pointed out that the existing controlling mode has too small adjustable amplitude

can’t effectively regulating the bed-temperature of CFB boilers. Through study and analysis

a recommendation of establishing a two-input and two-output multi-variable controlling system has been put forward

then

while the deviation of bed-temperature is comparatively small

only the match ratio of primary and secondary air is adjusted; while the said deviation is comparatively large

the coal-feeding amount and air quantity can simultaneously be adjusted.