Circulating fluidized bed (CFB) steam boiler, Capacity: 10 - 130 ton/h; Fuel: Coal, Biomass, Co-firing. A circulating fluidized bed (CFB) boiler features higher gas velocity in the furnace, The boiler activates a mixture of particles and gas to improve combustion reaction. Moreover, the fluid sand and fuel issuing out of the furnace are collected in a cyclone and recirculated into the furnace again, thereby improving combustion efficiency.