Inlet Guide Vane Tracking Effectiveness at Various Compressor Efficiency of Gas Turbine

Abstract

The baseload operating patterns in Java-Bali’s system are imposed on coal-fired power plants, the combined cycle power plant (CCPP) is used as a spinning reserve so that the CCPP operates with a small load factor (partial load) to support system reliability. This operation results in a high plant heat rate for the CCPP since it operates more often at minimum loads. To improve the heat rate of CCPP at partial load, inlet guide vane tracking (IGVT) is performed. IGVT alters the opening position of inlet guide vane (IGV) in the partial load operation. The effect of IGVT application in CCPP is analysed with several operating parameters, such as fuel usage, turbine exhaust temperature (TET), the total load generated by the CCPP, and the total of net plant heat rate (NPHR) after IGVT application. The variation on IGV leads TET to increase. A higher TET affects the heat recovery steam generator (HRSG) and causes the load generated by the steam turbine to become larger compared to the load before performing IGVT application. The results show that the combined cycle heat rate drops to 24 kCal/kWh and thus improving the efficiency of the CCPP, up to 1.5% in partial load operation model.