The technical features of external heat exchanger

shape of furnace

separator

and air preheater etc.for various kinds of 300 MW CFB boilers have been compared

and combining with concrete features of each object

corresponding type-selecting principle being put forward.It is more economic and applicable to select CFB boiler without external bed;the single air-distributing plate and double air-distributing plates all can be adopted in the furnace

but the effectiveness of double air-distributing plates will be better for fuels being hard to burn away;for fuels with a large amount of flue gas at high altitude and under low atmospheric pressure

it is recommended to first choose rotary air-preheater.