Pressurized Fluidized Bed Combustion (PFBC) Boiler
In Pressurized Fluidized
Bed Combustion (PFBC) type, a compressor supplies the Forced Draft (FD)
air and the combustor is a pressure vessel. The heat release rate in the
bed is proportional to the bed pressure and hence a deep bed is used to
extract large amount of heat. This will improve the combustion
efficiency and sulphur dioxide absorption in the bed. The steam is
generated in the two tube bundles, one in the bed and one above it. Hot
flue gases drive a power generating gas turbine. The PFBC system can be
used for cogeneration (steam and electricity) or combined cycle power
generation.
The combined cycle operation (gas turbine &
steam turbine) improves the overall conversion efficiency by
5 to 8%.
generation.
The combined cycle operation (gas turbine &steam turbine) improves the overall conversion efficiency by
5 to 8%.
