Abstract
The combined cycle power island consists of three major components: the gas turbine (GT), the heat recovery steam generator (HRSG), and the steam turbine (ST). The cleaned syngas is sent to the GT to produce electric power. The exhaust of the GT is used to generate steam through the HRSG. The steam is used to drive a steam turbine to generate more electric power. Since GTs are very special high-tech products, they are designed and manufactured with specific operating conditions in mind. Selection of GTs must be made from the existing commercially available models with their specific ratings; whereas, STs and HRSGs can be scaled up and manufactured to match the power required by the plant designers. Similarly, almost all of the other components in the rest of an integrated gasification combined cycle plant—such as air separation units, gasifiers, gas cleanup systems, etc.—can be scaled and custom-made to match the flow rates and fuel qualities needed for the GTs. Therefore, all of the thermal-flow parameters are typically designed around the GT’s specifications.
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