太阳能热化学反应器多场耦合及协同优化研究

MULTI-FIELD COUPLING MODELING AND COOPERATIVE OPTIMIZATION OF SOLAR THERMAL CHEMICAL REACTOR

以太阳能高温热化学反应器作为研究对象,针对甲烷还原氧化铈分解水制氢的两步法热化学循环过程,建立耦合光学、流动与传热、化学反应动力学及组分输运的多物理场模型,与实验结果对比验证模型精确性;研究各场之间的耦合机制及其对提升太阳能燃料转化效率的影响机理,提出太阳能反应器内的光-热-化学过程之间的协同优化方法。结果表明:甲烷氧化放热与氧化铈还原吸热互相作用使得催化剂温度存在波动;提高催化剂质量,同时辅以适当的光功率与反应物流量,反应物产率可得到进一步提升,太阳能-化学能转化效率最大可达到38.75%。

A multi-physical field model of the solar reactor was established for a two-step thermochemical cycle of methane-reducing cerium oxide and water splitting. Model accuracy was verified by comparison with the experimental results. The coupling mechanism between various fields and its effect on improving the efficiency of solar fuel conversion were studied,and a cooperative optimization method among photothermal-chemical processes in the solar reactor was proposed. Results show that the temperature fluctuates due to the interaction between methane oxidation heat release and cerium oxide reduction heat absorption. Parameter sensitivity analysis shows that the yield of the reaction product can be improved with the increase of the reactor scale. The maximum solar-to-chemical efficiency can reach 38.75% under the condition of the optimal power and composition flow rate. This paper can provide a theoretical reference for the study of solar reactor mechanisms and amplification.