Peak regulation performance study of the gas turbine combined cycle based combined heating and power system with gas turbine interstage extraction gas method

Abstract

Improving the peak regulation performance of the gas turbine combined cycle (GTCC)-based combined heating and power (CHP) system helps to increase the integration of renewable energy. A new method of the gas turbine (GT) interstage extraction gas is proposed to improve the peak regulation performance of the GTCC-based CHP system. The effect of the GT interstage extraction gas method on both the gas turbine expansion ratio and gas turbine extraction gas temperature are studied, and the heat and power operation regions of the GTCC-based CHP system are obtained. Finally, using a heating characteristic day as an example, the peak regulation performance and natural gas consumption changes of the GTCC-based CHP system are analysed. The results indicate that the GT interstage extraction gas method helps to expand the heat and power operation regions of the GTCC-based CHP system under the same output power. During the entire heating season from Nov.15th to Mar.15th, under the GT interstage extraction gas method, the integration of renewable energy is increased by 72071 MW, the natural gas consumption is decreased by 861.74 × 104 m3 and the profit is decreased by $4.72 × 105.