CaO/CaCO3 流化床反应器释能动态 特性研究及敏感性分析

This study utilizes the finite volume method to construct a dynamic simulation model for a MW-level CaO/CaCO₃ fluidized bed reactor used in the sCO₂ solar thermal power plant. The aim is to gain insights into the dynamic characteristics of the CaO/CaCO₃ fluidized bed reactor during its energy release process and enhance its system design and safety control. The dynamic response characteristics of the reactor system under typical disturbances are investigated, and a sensitivity analysis is conducted on the influence of key parameters on heat and mass transfer during the energy release process of the CaO/CaCO₃ fluidized bed reactor. Results indicate that altering the inlet flow rate and temperature of sCO₂ on the absorptive side significantly affects the outlet temperature. Compared to changing the particle's inlet temperature on the exothermic side, adjusting the particle's inlet flow rate has a greater impact on the outlet temperature. A step disturbance of 10% in the inlet flow rate of exothermic-side particles can result in temperature fluctuations up to 17. 5 °C at the outlet of the sCO₂ on the absorptive side. In contrast, a similar percentage disturbance in the inlet temperature can only lead to a maximum temperature change of 3. 9 °C at the outlet of the sCO₂ on the absorptive side. Furthermore, increasing the number of tubes, reducing tube diameter, and decreasing particle size contribute to improving the thermal efficiency and conversion rate of the CaO/CaCO₃ fluidized bed reactor. Increasing the number of tubes shows the most obvious effect. When the number of tubes increases from 20 to 40, the thermal efficiency and CaO particle conversion rate of the reactor rises by 2. 9% and 2. 4%, respectively. These research findings can guide the integration and design of CaO/CaCO₃ thermochemical energy storage and solar thermal power generation systems.