Combining with the fact that the boiler must be shutdown when slagging occurred in a 440 t/h circulating fluidized bed (CFB) boiler in the process of operation

the slagging mechanism in CFB boiler and affecting factors have been analysed

and measures for preventing slagging being put forward. Analysis of related parameters shows that the important causes leading to slagging in CFB boilers are badly fluidized bed material and variation of particles’ adhesiveness under high temperature.