Post-combustion absorption carbon capture assisted by sorption-compression cascade heat pump

作者：Yan Huang, Wei Liu, Yanxiang Zhang, X.J. Zhang, T. Wang, Mengxiang Fang, Yuxing Yao, Xiaoying Zheng, Xinying Liu, L. Jiang · 发表于：Carbon Capture Science & Technology · 年份：2025 · DOI：10.1016/j.ccst.2025.100393 · 被引用次数：7 · 研究领域：Carbon Dioxide Capture Technologies、Refrigeration and Air Conditioning Technologies、Adsorption and Cooling Systems

The application of heat pumps in carbon capture systems is crucial for post-combustion carbon capture in power plants. However, existing heat pump and carbon capture coupling schemes face issues such as excessive electricity consumption or low waste heat recovery efficiency. Therefore, energy-saving processes are equally indispensable for reducing the energy consumption of carbon capture. A novel cascade heat pump, that is composed of absorption heat pump and lean vapor recompression , is initially proposed for amine-scrubbing capture system. Based on different waste heat utilization and heat pumps, various energy-saving processes are evaluated based on an absorption carbon capture system for a 660 MW coal-fired power plant. The results indicate that the cascade heat pump type is conducive to reducing energy consumption , while the single-stage type results in lower power efficiency loss. At a 90 % carbon recovery rate, the optimal unit energy consumption of the capture system is 2.23 GJ/t CO2 , which is achieved by cascade heat pump coupling with additional steam extraction for generator at flash pressure of 40 kPa. The minimum efficiency loss of power plant is 7.5 % by using lean vapor recompression with waste heat utilization in reboiler and flash drum at flash pressure of 80 kPa and 100 kPa. The maximum net CO 2 recovery rate of 73.48 % is achieved by using lean vapor recompression with waste heat utilization in reboiler and flash drum at flash pressure of 80 kPa. The com...