22MW Coal Plant for Sale
60Hz. "As is, where is"
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PLANT DESCRIPTION
The plant is located in the NE US between a major river and a hydropower
canal, with the facility's transmission lines extending directly to an
interconnection with the power grid. The total land mass equals a three acre
parcel.
The facility is an independent power producer utilizing a Westinghouse-Canada Limited turbine/generator set to deliver power to the system. It was built in 1984. The turbine/generator is a multi-valve, multi-stage, extraction/condensing unit designed for the inlet flow of 175,000 lb/hr of steam at 1350 psig/950F. There is one uncontrolled extraction stage for low-pressure feedwater heating, and one controlled extraction at 75 psig for process and deaerator use. The turbine exhausts at approximately 2 in Hg to a conventional surface condenser, in turn, transfers heat to a closed-loop circulating-water system that includes a three-cell mechanical-draft cooling tower. The generator is brushless, rated at 24,800 kVA, 13.8 kV, 0.80 pf.
Steam is produced by a Zurn Industries coal-fired boiler which is rated to supply 171,490 lb/hr steam at 1400 psig @ 950F. The boiler is a conventional stoker-fired, traveling split-grate configuration, capable of delivering 9.2 tons/hr of sized coal to support generation, an economizer and air preheater. Coal is received by truck, transferred to an on-site coal silo with a 14 day at full-load supply capacity. From the storage silo, coal is mechanically conveyed to the 100-ton capacity day bin, gravity fed to a batch scale prior to entering the coal distributor and the five feeders firing the boiler. Boiler bottom-ash and baghouse fly-ash is removed through a mechanical vacuum system and is deposited in their respective silos for truck transport. Pollution-control is maintained by staged combustion for Nox control, a flue-gas desulfurization system addressing SO2, and a six module pulse-jet fabric-filter baghouse controlling particulate.
Raw water from the adjacent power canal is treated in the water treatment system providing a continuous supply of high purity makeup water to the steam cycle. The water treatment system consists of up-flow and polymer feed system, filter water tanks and pumps, carbon filter, two precoat leaf filters, and two demineralizer trains all manufactured by Indeck. The system is designed to have a continuous output of 110 GPM available for use as boiler make-up, with higher output flow rates available for limited durations. The water is fed to the boiler by an electric boiler feed pump manufactured by Ingersoll-Rand Company, with a turbine-driven boiler feed pump used as a back up. A neutralization system is available to treat wastewater discharged from the facility. A connection to the town's potable water system serves sanitary needs, as well as the facility fire protection system.
The primary control for the cogeneration is a Westinghouse distributed digital control system, which in itself provides the main operator interface via CRT control consoles. The integrated control system uses microprocessor-based controls, located in the central control room, operating all systems including the boiler, turbine/generator, water treatment system, coal and ash handling systems. The digital control system communicates with the programmable controllers through a serial link, so operator interface is through the distributed-control-system display.
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View of the Westinghouse steam turbine used to drive the generator. The steam turbine is driven with high-pressure steam. This is the original equipment from the plant, and has an expected useful life of over 20 years remaining. |
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View of the GE 22MW generator. This piece of equipment is the workhorse of the facility, producing the electrical output. As with the turbine, this equipment has over 20 years of expected useful life remaining. |
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View of the Boiler Room with Zurn Boiler. This is a traveling grate boiler designed to burn coal. Coal is mechanically fed via the 5 stokers from the 100-ton day bin, which is in turn mechanically fed from the coal silo that holds a 14-day supply of coal on-site. Ash is mechanically removed to the hoppers for removal. |
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View of the Control Room. Some of this equipment should be updated to replace older analog equipment with newer digital readouts. Additional monitoring equipment is needed to ensure compliance with current air quality standards. When built, this was a state-of-the-art operation, and was designed to be upgradeable. |
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View of the Cooling Towers with the main stack and coal silo in the background. These towers provide a means to return the cooling steam to the plant as condensate to be re-used. |
