In recent years, the circulating fluidized bed (CFB) boiler has been rapidly developed. Various CFB technology styles and boiler types have been formed. There are 3 main kinds of CFB technologies developed by universities and institutes in China. One of them is Π-shaped CFB boiler with down-exhaust cyclone separator designed by the National Laboratory of Coal Combustion (NLCC) in Huazhong University of Science and Technology (HUST). This paper summarizes the technology improvement and progress of this kind of boiler, and discusses the design considerations. This paper also describes some issues in shakedown and operation process of a 75t/h Π-shaped CFB boiler.

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