BC-I Repowering Project
Circulating Fluidized-Bed [CFB] Boiler

1. Fuel Input
Fuel and limestone are fed into the combustion chamber of the boilers while pre-heated air is blown in to “fluidize” the mixture. This fuel and limestone mixture burns and produces heat.

2. Circulating Fluidized-Bed Boiler
Heat from the combustion process boils the water in the water tubes turning it into steam.

3. Cyclone
The cyclones are used to return unburned fuel back to the combustion chamber for re-burning making the process more efficient.

 4. SO2 Scrubber and Baghouse
Hot gases from the combustion chamber pass through the boiler where it continues to heat the steam, then through the air pre-heater and through the “scrubber” where lime is injected to remove sulfur dioxide. At the “baghouse” which is a very efficient filter designed to remove particulate matter from the flue gas before is sent out through the stack.

5. Steam Turbine
The steam produced from this process is
passed through a steam turbine which turns a generator to produce electricity.

6. Transmission
The electricity is then sent through transmission wires which delivers it to the ultimate user though distribution lines.