Abstract
This paper presents a three-part analysis of steam-injected gas turbines (simple and reheat) as follows: Part I - Steam Rates, Part II - Steam Cycle Efficiency and Part III - Steam-ReGenerated Heat (RGH). The analysis is based on the same approach used for large-utility steam turbines where one pound of throttle steam is passed through the steam turbine, and where enthalpy points are determined along the steam path. Work output, heat input and turbine efficiency are thus determined from this data. When considering a gas turbine, the steam-injection flow is separated from the main gas stream for analysis. Dalton’s and Avogadros’ laws of partial pressure and gas mixtures are applied. Accurate analysis of heat input, partial pressure expansion and heat-rejection steam-enthalpy points are computed with steam-table software.
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