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Performance entitlement of supercritical steam bottoming cycle

A supercritical steam bottoming cycle has been proposed as a performance enhancement option for gas turbine combined cycle power plants. The technology has been widely used in coal-fired steam turbine power plants since the 1950s and can be considered a mature technology.

Its application to the gas-fired combined cycle systems presents unique design challenges due to the much lower gas temperatures (i.e., 1,202°F [650°C] at the gas turbine exhaust vis-à-vis 3,632°F [2,000°C] in fossil fuel-fired steam boilers). Thus, the potential impact of the supercritical steam conditions is hampered to the point of economic infeasibility.

This technical brief draws upon the second-law based exergy concept to rigorously quantify the performance entitlement of a supercritical high-pressure boiler section in a heat recovery steam generator utilizing the exhaust of a gas turbine to generate steam for power generation in a steam turbine.

To obtain a copy of the paper

Journal of Engineering for Gas Turbines and Power, volume 135, issue 12, 2013

Author

John Gulen

Published

Journal of Engineering for Gas Turbines and Power, volume 135, issue 12, 2013.