Because of many problems existing in the combustion control system of circulating fluidized bed (CFB) boiler

such as non-linearity and strong time-varying behavior of the distributed parameters

as well as closely coupling among multiple variables etc.

it brings comparative difficulty to realization of automatic control for the combustion system of boiler

especially for the bed temperature control system. Directing against the practical situation of a 450 t/h boiler in Baoding Thermal Power Plant

the insufficiency of originally designed bed-temperature control system has been analysed

and retrofit of the said system being implemented

thereby

the control effectiveness to be better than that of the originally designed system

and the automatic system to be easily put into operation.