Efficiency Enhancement of Gas Turbine Systems with Air Injection Driven by Natural Gas Turboexpanders

The fuel source of many simple and combined-cycle power plants usually comes from a nearby natural gas transmission pipeline at pressure 50 to over 70 bar. use turboexpander instead throttling equipment offers promising alternative regulate the introduced plant. Specifically, it helps recover part available energy compressed in pipeline, increase output efficiency turbine system, decrease harmful emissions. In this paper, addition such pressure-reduction station is studied. recovered then used drive compression extra air added combustion chamber heavy-duty turbine. performance configuration analyzed for wide range ambient temperatures using exergy analyses. Fuel way increases system by minimum 2.5 MW 0.25%, respectively. approximately 0.36% annual CO2 emissions 1.3% per MW.