Comprehensive Analysis of Adiabatic Compressed Air Energy Storage and Gas Turbine Hybrid System With Thermal Integrations

Abstract

Combining an adiabatic compressed air energy storage (A-CAES) with a gas turbine (GT) can address any sudden changes in demand, but a comprehensive analysis of the integration effects between A-CAES and GT is needed. This study introduced a regenerative A-CAES-GT hybrid system with two thermal integrations: preheating and regeneration. These integrations resulted in an 11% increase in electric power and a 3%p increase in round-trip efficiency for the hybrid system compared to A-CAES and GT stand-alone systems. In addition, the hybrid system generated thermal power through thermal integrations, leading to a combined heat and power (CHP) round-trip efficiency higher than 60%. Various load control strategies for part load operation of the hybrid system were used and investigated. With a stable control strategy, optimal dispatch for the regenerative A-CAES-GT hybrid system was obtained, considering the environmental and energy-autonomy indices. The hybrid system revealed a 41% lower equivalent carbon dioxide emission factor (CEF) than the optimal dispatch for the A-CAES and GT stand-alone systems. Furthermore, the hybrid system showed a 4%p higher self-sufficiency under a low CEF of the grid and high demand.