Abstract Thermochemical energy storage of CaO/CaCO3 system is a rapidly growing technology for application in concentrated solar power plant. In this work, the energy storage reactivity and attrition performance of the limestone during the energy storage cycles were investigated in a fluidized bed reactor. The effects of CO2 concentration, reaction temperature, fluidization velocity, particle size and number of cycles were discussed. With increasing CO2 concentration from 80% to 100%, the energy storage capacity and attrition rate of the limestone increase by 11% and 9%, respectively. The feasible carbonation and calcination temperatures are 850–870 °C and 800–850 °C, respectively. The energy storage capacity of the limestone improves with increasing fluidization velocity in carbonation stage. As the fluidization velocity increases from 0.04 to 0.06 m/s, the attrition rate of the limestone after 5 cycles increases by 96%. Smaller particles show higher energy storage and attrition resistance during the cycles. Further, the cyclic stability of the limestone carbonated at higher fluidization velocity is higher than that carbonated at static (solid-like) state. The limestone operated at the fluidization state exhibits a higher cyclic energy storage capacity than that at the static (solid-like) state. Higher fluidization velocity significantly mitigates the pore-plugging and sintering of the limestone.

中文翻译：

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CaO/CaCO3循环流化作用下石灰石的储能和磨损性能

摘要 CaO/CaCO3 系统的热化学储能是一项快速发展的技术，在聚光太阳能发电厂中的应用。在这项工作中，在流化床反应器中研究了石灰石在储能循环过程中的储能反应性和磨损性能。讨论了 CO2 浓度、反应温度、流化速度、粒径和循环次数的影响。随着 CO2 浓度从 80% 增加到 100%，石灰石的储能能力和磨损率分别增加了 11% 和 9%。可行的碳化和煅烧温度分别为 850-870°C 和 800-850°C。石灰石的储能能力随着碳酸化阶段流化速度的增加而提高。随着流化速度从 0.04 增加到 0。06 m/s，5次循环后石灰石磨耗率提高96%。较小的颗粒在循环过程中表现出更高的能量储存和耐磨性。此外，在较高流化速度下碳酸化的石灰石的循环稳定性高于在静态（类固体）状态下碳酸化的石灰石。在流化状态下运行的石灰石比在静态（类固体）状态下表现出更高的循环储能能力。较高的流化速度显着减轻了石灰石的孔隙堵塞和烧结。在较高流化速度下碳酸化的石灰石的循环稳定性高于在静态（类固体）状态下碳酸化的石灰石。在流化状态下运行的石灰石比在静态（类固体）状态下表现出更高的循环储能能力。较高的流化速度显着减轻了石灰石的孔隙堵塞和烧结。在较高流化速度下碳酸化的石灰石的循环稳定性高于在静态（类固体）状态下碳酸化的石灰石。在流化状态下运行的石灰石比在静态（类固体）状态下表现出更高的循环储能能力。较高的流化速度显着减轻了石灰石的孔隙堵塞和烧结。