The circulating fluidized bed(CFB) boiler has the advantages of low fuel cost

strong adaptability and high combustion efficiency

but its combustion model has multiple variables and complicated relationship. As the unique parameter during combustion process of CFB boiler

bed temperature is affected by several factors and it is difficult to control. To solve this problem

this paper analyzes the factors affecting the bed temperature and the dynamic process by mechanism analysis

and establishes the dynamic control model for bed temperature. The parameters of the model were identified by power plant experiments and operation data. Application of this bed temperature model in a 300 MW unit CFB boiler show that

this bed temperature model has good adaptability and high identification accuracy

which can be applied in the practical power plants.