Experimental and simulation study of Mn–Fe particles in a controllable-flow particle solar receiver for high-temperature thermochemical energy storage

Abstract

CSP systems hold tremendous potential for large-scale and long-duration energy storage. However, their extensive adoption has been impeded by cost constraints. To overcome this hurdle, the development of the next generation CSP systems, focusing on high-temperature heat absorption and storage, is paramount for reducing the LCOE. The integration of TCES technologies shows promise in bolstering energy storage density, stability at high temperatures, and decreasing the LCOE. This study investigates the performance of Mn–Fe particles in a controllable-flow particle receiver operating at high temperatures. Experimental data demonstrate that the particles reach a maximum temperature of 1041.8 °C, resulting in an outstanding outlet particle thermochemical reaction conversion rate of 96.35%. Critical parameters influencing receiver performance were also examined meticulously. It was observed that increased incident flux density significantly enhanced receiver efficiency of 88%. Moreover, effective management of local overheating through the integration of TCES proved indispensable. The outlet particle temperature differential was merely 9.53 °C, and the sudden fluctuations in incident flux led to a limited temperature rise of 4.84 °C, attributing to intensified reaction enthalpy and reaction rate. By optimizing operational stability, continuous operation of CSP systems under high temperatures can be achieved, maximizing efficiency and allowing for greater system flexibility.