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341 More than one gas turbine could be used in conjunction with a single steam turbine by using a larger HRSG and multiple gas turbine exhaust ducts. Alternatively, each gas turbine may have its own HRSG, with all HRSGs thermally coupled to the steam turbine through feedwater and steam line headers. An HRSG may be designed to burn additional fuel at its inlet using oxygen remaining in the gas turbine combustion gas to raise the temperature the HRSG gas and provide higher heat transfer to the water. Such a design is called a fired HRSG, and its use is usually referred to as supplemental firing. Figure 9.8 shows large heat-recovery steam generators built for a nominal 450- MW combined-cycle plant in Texas utilizing three 100-MW gas turbines and one 140-MW steam turbine. The Comanche power station, located near Lawton, Oklahoma, is an example of a combined-cycle facility that employs HRSGs. Two Westinghouse simple- cycle natural-gas-fired gas turbines, as diagramed in Figure 9.9, drive 85-MW electrical generators and exhaust into separate HRSGs designed for supplemental firing. Steam at 1200 psia and 950°F produced by the HRSGs is supplied to one nonreheat, single-extraction (not shown) steam turbine that drives a 120-MW electrical generator. The Comanche unit, first operated in 1974 (ref. 10) was upgraded in 1986 (ref. 11), resulting in a measured plant heat rate of 8508 Btu/kW-hr (40.1% thermal efficiency), with a gas turbine inlet temperature of 1993°F, an HRSG gas inletPDF Image | Advanced Systems Steam Power Plant
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