What Is The Working Principle of CFBC Boiler

CFBC boiler stands for circulating fluidized bed combustion boiler. Circulating Fluidized Bed combustion has given boiler and power plant operators a greater flexibility in burning a wide range of coal and other fuels. All this without compromising efficiency and with reduced pollution. What is the working principle of CFBC boiler?

Fluidized Bed

At the bottom of the boiler furnace there is a bed of inert material. Bed is where the coal or fuel spreads. Air supply is from under the bed at high pressure. This lifts the bed material and the coal particles and keeps it in suspension. The coal combustion takes place in this suspended condition. This is the Fluidized bed.
Special design of the air nozzles at the bottom of the bed allows air flow without clogging. Primary air fans provide the preheated Fluidizing air. Secondary air fans provide pre-heated Combustion air. Nozzles in the furnace walls at various levels distribute the Combustion air in the furnace.

Circulation

Fine particles of partly burned coal, ash and bed material are carried along with the flue gases to the upper areas of the furnace and then into a cyclone. In the cyclone the heavier particles separate from the gas and falls to the hopper of the cyclone. This returns to the furnace for recirculation. Hence the name Circulating Fluidized Bed combustion. The hot gases from the cyclone pass to the heat transfer surfaces and go out of the boiler.
 

CFBC Boiller ＆ ZBG

ZBG circulating fluidized bed boilers have many advantages, such as high combustion efficiency, energy saving, fuel flexibility, low NOx, SOx emission. In 2015, our QXX series 116 MW CFB boiler’s thermal efficiency reached to 91.89%, as the NO.1 among other CFB boilers.