market-based advanced coal power systems final report - National ...

3.1.5 Steam Turbine Generator and Auxiliaries
Market-Based Advanced Coal Power Systems
The turbine is tandem compound type, comprised of HP - IP - two LP (double flow) sections, and
30-inch last-stage buckets. The turbine drives a hydrogen-cooled generator. The turbine has DC
motor-operated lube oil pumps, and main lube oil pumps, which are driven off the turbine shaft.
The turbine is designed for 434,500 kW at generator terminals. The throttle pressure at the
design point is 2400 psig at a throttle flow of 2,734,000 lb/h. The exhaust pressure is 2.0/2.4 inch
Hg in the dual pressure condenser. There are seven extraction points.
The condenser is two shell, transverse, dual pressure with divided waterbox for each shell.
3.1.6 Coal Handling System
The function of the balance-of-plant coal handling system is to provide the equipment required for
unloading, conveying, preparing, and storing the coal delivered to the plant. The scope of the
system is from the trestle bottom dumper and coal receiving hoppers up to and including the slide
gate valves on the outlet of the coal storage silos.
Operation Description
The 6" x 0 bituminous Illinois No. 6 coal is delivered to the site by unit trains of 100-ton rail cars.
Each unit train consists of 100, 100-ton rail cars. The unloading will be done by a trestle bottom
dumper, which unloads the coal to two receiving hoppers. Coal from each hopper is fed directly
into a vibratory feeder. The 6" x 0 coal from the feeder is discharged onto a belt conveyor
(No. 1). The coal is then transferred to a conveyor (No. 2) that transfers the coal to the reclaim
area. The conveyor passes under a magnetic plate separator to remove tramp iron, and then to
the reclaim pile.
Coal from the reclaim pile is fed by two vibratory feeders, located under the pile, onto a belt
conveyor (No. 3), which transfers the coal to the coal surge bin located in the crusher tower. The
coal is reduced in size to 3" x 0 by the first of two coal crushers. The coal then enters a second
crusher that reduces the coal size to 1" x 0. The coal is then transferred by conveyor (No. 4) to
the transfer tower. In the transfer tower the coal is routed to the tripper that loads the coal into
one of the six silos.
3.1-11 December 1998