Equipment
The plant utilizes equipment from the old nuclear plant in conjunction with the coal conversion equipment. The original Westinghouse Electric Company high-pressure/low-pressure turbine was modified and the high-pressure section was removed. The Westinghouse generator was to generate 838 MWe per the original nuclear design. Asea Brown Boveri was contracted to design the high-pressure turbine, intermediate-pressure/reheat turbine and generator. The HP/IP generator produces 900 MWe and the Westinghouse LP generator produces 497 MWe. The plant's feedwater pump is powered by a turbine, rather than electrical pumps like in many other plants. The feedwater turbine was designed by Asea Brown Boveri and generates 67,000 horsepower.
The boiler was designed by Babcock & Wilcox and is a supercritical boiler with a maximum superheater outlet pressure of about 3800 psi and temperature of about 1050 degrees fahrenheit. The reheat section of the boiler operates at about 650 psi and also about 1050 degrees fahrenheit.
The plant also utilizes several environmental controls such as selective catalytic reduction to reduce NOx emissions, electrostatic precipitators to remove fly ash, and a recently upgraded flue-gas desulfurization system which now removes up to 98% of the sulfur dioxide. The gypsum byproduct of the FGD system is sold to make drywall and fertilizer. Many new environmental controls are also tested at this plant.
It is interesting to note that the plant's hyperboloid cooling tower was designed to handle the cooling for the original nuclear plant. This creates generating efficiency issues during very hot summer days, as the cooling tower must cool much more equipment than it was originally designed for.
Read more about this topic: William H. Zimmer Power Station
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