基于热泵储电的绝热钙循环卡诺电池系统特性及优化研究

To tackle energy shortages and their uneven distribution, we propose a novel and advantageous coupled system that integrates Ca-looping thermochemical energy storage and pumped thermal electricity storage. In this system, charging is accomplished by using a heat pump to supply heat for the dehydration process, while discharging leverages the heat generated from hydration to produce electricity. This approach effectively eliminates thermal dissipation losses during storage, enabling long-term, large-scale energy storage. Our analysis highlights the impact of various operating parameters on cycle efficiency. Increasing the cycle pressure ratio during charging positively affects cycle efficiency but also increases a greater burden on the system, leading to diminishing marginal returns. The absorption temperature of the heat pump and dehydration temperature should be closely aligned to optimize performance. Minimizing the pinch temperature is crucial to enhance thermal energy utilization. During discharging, increasing the pressure ratio or aligning the intermediate pressure with the ideal value boosts the net power of the cycle, thereby enhancing cycle efficiency. Higher heat absorption temperatures of the generator and hydration temperatures, along with elevated storage temperatures of Ca(OH)₂, improve outcomes. However, the preheating temperatures of CaO and H₂O have a small impact. We employed the black-box concept, pinch analysis, and an improved genetic algorithm for optimization. This approach effectively controls exergy loss in the heat exchange network, achieving a maximum cycle efficiency of 65.96%. These results demonstrate the system competitiveness as a viable energy storage solution.