Results Summary Environmental Sorbent size had the greatest effect on SO 2 removal efficiency as well as stabilization and heat transfer characteristics of the fluidized-bed. PFBC boiler demonstrated commercial readiness. ASEA Stal GT-35P gas turbine proved capable of operating commercially in a PFBC flue gas environment. The Tidd plant was a relatively small-scale facility, as such, detailed economics were not prepared as part of this project. Project Summary Coal and sorbent conveyors can be seen just after entering the Tidd Plant.
Fluidized combustion is inherently efficient.
The latter contributed significantly to system efficiency because of the high efficiency of gas turbines and the availability of gas turbine exhaust heat that can be applied to the steam cycle. A bed design temperature of 1,580 F was established because it was the maximum allowable temperature at the gas turbine inlet and was well below temperatures for coal ash fusion, thermal NO x formation, and alkali vaporization. Crushed sorbent, either dolomite or limestone, was injected into the fluidized bed via two pneumatic feed lines, supplied from two lock hoppers. The sorbent feed system initially used two injector nozzles but was modified to add two more nozzles to enhance distribution. In 1992, a 10-MWe equivalent APF was installed and commissioned as part of a research and development program and not part of the CCT Program demonstration.