Integrated steam and gas cycles
PFBC-EET technology integrates steam and gas turbine cycles for high net plant cycle efficiency. That means reduced fuel consumption, lower CO2 greenhouse gas emissions, and the option of accepting wet fuels without sacrificing efficiency.
At 850ºC (1560ºF), the fluidized bed's oxidation temperature is too low for thermal NOx production, but optimal for SOx capture with least sorbent consumption. Rugged, solid gas-turbine blades operate effectively under these conditions.
Third-generation fluidized bed
The low-velocity deep-bubbling fluidized bed improves oxidation efficiency for high carbon utilization, low CO emissions, long boiler tube service life, high heat transfer coefficient due to reduced boiler tube surface, and the ability to accept fuels with high fines content ranging from oil shale to petroleum coke. Fuels of varied quality produce low-emission, high-efficiency green power.
Specially designed gas turbines
The twin-spool, intercooled, variable-speed PFBC design provides high cycle efficiency despite low turbine inlet temperature. While part-load efficiency is high, part-load emissions remain low.
Pressurized cycle design
PFBC technology incorporates a dense fluidized bed and reduced boiler-tube surface area in a compact footprint that facilitates repowering. High CO2 partial pressure eliminates CaO formation, while benign, cementicious ash produces low leaching mass, unhinges CO-NOx-SOx compounds inherent at lower pressures, and reduces fuel-bound, nitrogen-derived NOx.
Easy-to-maintain pollution control devices effectively capture particulate and mercury emissions.
Combined independent steam turbine island cycle
PFBC technology facilitates repowering flexibility and steam-cycle freedom during both subcritical (2650 PSIA or less) and supercritical (3600 PSIA or more) cycles, under reheat or non-reheat conditions and in condensing or district heating situations. The system is compatible with either air-cooled or hybrid air/water-cooled condensers.
P200 and P800 PFBC power plants can be built as stand-alone units or installed as parallel modules to create 200- to 1600-MW facilities.
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