ABSTRACT
In this chapter, a trigeneration system for the combined production of electricity, process heat, and chilled water is proposed. It includes an intercooled-recuperative gas turbine (IRGT) cycle, a heat recovery steam generator (HRSG), an absorption refrigeration system (ARS), and a reheated-organic Rankine cycle (R-ORC). The ARS operates by using the low-grade heat rejected during the intercooling of the compressed air, while the HRSG and R-ORC operate by using the surplus heat available at the gas turbine exhaust gas. The objective of the present study is to investigate the exergoeconomic and environmental feasibility of incorporating ARS, R-ORC, and HRSG into the IRGT plant using the proposed configuration. According to the results, the net power generated by the proposed trigeneration system is 50.93 MW, with the overall energy and exergy efficiency of 83.14% and 50.65%, respectively. In addition, the HRSG provides 64.43 ton/h of water into saturated steam for process heating, while the ARS generates a 7.73 MW of cooling effect. Moreover, the system and environmental cost rates are measured to be 3,788.5 $/h and 774.26 $/h. The proposed system also has a lower environmental effect than the standalone IRGT cycle since the IRGT cycle’s specific CO2 emission is 522.61 kg/MWh, which is reduced to 244.45 kg/MWh after the incorporation of HRSG, R-ORC, and ARS. Finally, a parametric analysis is conducted to investigate the impact of overall compressor pressure ratio, gas turbine isentropic efficiency, and air compressor isentropic efficiency on the performance of the trigeneration system.
