Performance improvement of combined cycle power plant with combined ice slurry thermal energy storage cooling and adsorption cooling. (May 2023) - Chen, Ting
Abstract: To increase the performance and power output of the conventional combined cycle power plant (CCPP), a combined cooling system (CombC) of adsorption cooling system (AdCS) and ice slurry thermal energy storage (ISTES) is proposed for CCPP inlet air cooling. A simplified model for CCPP power output prediction under different inlet air temperatures is developed, and it is verified through practical operational data. The power outputs and economic analyses of CCPP-CombC with different cooling energy storage scales are evaluated. For the present CCPP, AdCS with a maximum cooling capacity of 6000 kW and ISTES with 600 GJ of cooling energy storage completely cover the cooling demand of the CCPP. The daily electricity increment increases as the cooling energy storage scale increases, but with a declining growth rate. The net profit of the CCPP-CombC increases first and then decreases, and the maximum net profit appears when the cooling energy storage is 500 GJ, and it is 82.7 % and 17.0 % higher than the net profit when the cooling energy storage is 200 GJ and 600 GJ, respectively. Cost recovery occurs within 1 year of installing the combined cooling system. Highlights: A combined cooling system of adsorption and ice slurry thermal energy storage is proposed for CCPP inlet air cooling. A simplified model for CCPP power output prediction under different inlet air temperatures is developed. The daily electricity increment increases as the cooling energy storage scale increases, but with a declining growth rate. The net profit of the combined cycle power plant with the combined cooling system increases first and then decreases.