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Exxon Chemical's Coal-Fired Combined Cycle Power Technology
Abstract
Exxon Chemical's Central Engineering Division
has recently developed and patented CAT-PAC
for Industrial Cogeneration and Utility Power
Plants. It involves the marriage of a conventional
direct pulverized coal-fired boiler
radiant section with a convection section adapted
from our furnace experience. In particular, it
is an open-cycle, hot air turbine arrangement
with indirect heating of the air in the boiler
convection section. The turbine exhaust is then
used as pre-heated combustion air for the boiler.
The air coil heats the 150 psig air from the
standard gas turbine axial compressor to
approximately, 1750°F.
Today, CAT-PAC would require about 10% less
fuel (or 1000 Btu/kwh) than the best coal-fired
Utility Plant for the same net power output, at a
comparable investment. With improved air heater
metallurgy, and/or trim firing of a premium fuel
(up to 2000° F permissible gas turbine temperature),
CAT-PAC savings would double to 20%.
Today, in an industrial coal-fired cogeneration
plant, CAT-PAC can produce up to 75% more power
for a given steam load, while maintaining the
highest cogeneration efficiencies. With improved
metallurgy, and/or trim firing, the additional
power would approach 100%.
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Citation
Guide, J. J. (1985). Exxon Chemical's Coal-Fired Combined Cycle Power Technology. Energy Systems Laboratory (http://esl.tamu.edu). Available electronically from https : / /hdl .handle .net /1969 .1 /93112.