An integrated power generation system combined with a parabolic trough solar system

a compressed air energy storage(CAES) system

and a thermal power plant is proposed to achieve the goal of “carbon neutralization”in 2060

and utilize solar energy and energy storage technology based on coal-fired power plant(CFPP). This system can overcome the disadvantage of extracting heat from the thermal power plant during the discharge process of CAES when coupling with CFPP and makes full use of the heat produced by the parabolic trough solar system to improve the utilization of renewable energy and reduce the coal consumption. The thermal performance and coalsaving effect of this system under 100% load operation condition of the thermal power plant are analyzed by EBSILON software. The results show that compared with the conventional CFPP system

the average heat consumption of the integrated system with scheme 2 reduces by 33.5 k J/(kW·h)

and the average standard coal consumption rate decreases by 1.30 g/(kW·h). The CAES system of the integrated power generation system with scheme 2 can achieve 68.81% productivity

16.49% higher than that of the advanced adiabatic compressed air energy storage(AA-CAES) system. The calculating results of the exergy loss of each component reveal that the No.5～8heat exchanger in the CAES system has a higher energy-saving potential. The annual electricity sales profit of the integrated power generation system is up to 10.454 9 million yuan according to the peak and off-peak electricity usage times and rates of a city implemented in 2019.