Thermodynamic analysis of supercritical CO2 power cycle for waste heat recovery of ammonia gas turbine
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This study presents a thermodynamic analysis of a supercritical CO2 (SCO2) power cycle for waste heat recovery from an ammonia-fueled marine gas turbine. The ammonia gas turbine and SCO2 power cycles were modeled, and the effects of key design variables were evaluated. Thermodynamic simulations were performed under steady-state conditions using a commercial process simulation program. Parametric analyses were conducted for ammonia inlet pressure, gas turbine inlet temperature, CO2 turbine inlet pressure, minimum approach temperature of CO2 heater, and cooling water outlet temperature of CO2 cooler. The results indicate that higher ammonia inlet pressures and gas turbine inlet temperatures improve both the system efficiency and heat recovery rate. Reducing the minimum approach temperature in the CO2 heater improves the cycle performance. Meanwhile, the CO2 turbine inlet pressure and the cooling water outlet temperature of the CO2 cooler have specific ranges that maximize the system efficiency. When the design variables that yield the highest system efficiency are combined, the resulting overall efficiency and heat recovery rate are 45.11% and 68.58%, respectively. This study presents an integrated thermodynamic evaluation of an ammonia-fueled gas turbine combined with an SCO2 power cycle, which has received limited attention in previous studies.
Abstract
This study presents a thermodynamic analysis of a supercritical CO2 (SCO2) power cycle for waste heat recovery from an ammonia-fueled marine gas turbine. The ammonia gas turbine and SCO2 power cycles were modeled, and the effects of key design variables were evaluated. Thermodynamic simulations were performed under steady-state conditions using a commercial process simulation program. Parametric analyses were conducted for ammonia inlet pressure, gas turbine inlet temperature, CO2 turbine inlet pressure, minimum approach temperature of CO2 heater, and cooling water outlet temperature of CO2 cooler. The results indicate that higher ammonia inlet pressures and gas turbine inlet temperatures improve both the system efficiency and heat recovery rate. Reducing the minimum approach temperature in the CO2 heater improves the cycle performance. Meanwhile, the CO2 turbine inlet pressure and the cooling water outlet temperature of the CO2 cooler have specific ranges that maximize the system efficiency. When the design variables that yield the highest system efficiency are combined, the resulting overall efficiency and heat recovery rate are 45.11% and 68.58%, respectively. This study presents an integrated thermodynamic evaluation of an ammonia-fueled gas turbine combined with an SCO2 power cycle, which has received limited attention in previous studies.