Calcium looping for CO2 capture and thermochemical heat storage, a potential technology for carbon neutrality: A review
Youhao Zhang, Yuzhuo Wang, Kuihua Han, Jianli Zhao, Jun Jie Wu, Yingjie Li
Abstract
CO2 emissions have posed numerous global challenges, leading to an increasing consensus on the need for carbon neutrality in future development. CO2 capture and energy storage technologies represent a critical step in the carbon neutrality journey. Calcium looping (CaL), a promising technology for both CO2 capture and energy storage, holds significant potential in future carbon neutral technology strategies. In this paper, a comprehensive review of the application of CaL in CO2 capture and thermochemical heat storage (TCHS) is offered to inform further advancements in this field. Firstly, a brief overview and analysis of the fundamental technical routes and principles underlying of CaL for CO2 capture and TCHS are provided. Then, the research progress in the development of CaL-integrated systems for CO2 capture and TCHS is subsequently reviewed, with the existing limitations and outlining future prospects for further development highlighted. Additionally, a comprehensive summary of the proposed improvements in the performance of calcium-based materials is presented, focusing on enhancing carbonation reactivity in the multiple cycles and improving sunlight absorption performance of calcium-based materials. Finally, based on the current status of CaL development, insights and perspectives on potential avenues for further technological advancement are offered. Solar-driven CaL is a promising avenue for future CaL development, calling for greater research efforts on optimizing relevant equipment and enhancing calcium-based materials for sunlight-driven CaL systems. In addition, the CO2 in-situ conversion in the calcination stage of CaL is also a great potential direction for technological evolution.