适合于太阳能热发电的锰铁锂复合金属氧化物储热特性与热化学反应机理

CHARACTERISTICS AND THERMOCHEMICAL REACTION MECHANISM OF MANGANESE-IRON-LITHIUM COMPOSITE METAL OXIDE SUITABLE FOR SOLAR THERMAL POWER GENERATION

摘要: 提出在锰基氧化物中添加Fe₂0₃和Li₂0，构建锰铁锂三元复合金属氧化物，降低热化学储热反应温度，更好地满足新一代太阳能热发电系统需求。实验发现，与Mn₂O₃相比，新生成的Li₂Fe Mn₃O₈复合氧化物的还原反应初始温度由773℃降低至622℃；还原反应活化能从797.10 k J/mol降低至132.44k J/mol；氧化反应由难以进行，变为从590℃开始进行；氧化放热量增至209.40 k J/kg；经过105次循环后仍保持良好的循环反应稳定性。

Abstract: The iron and lithium oxideswere added to the manganese-based oxide to reduce the reaction temperature for thermochemical energy storage,facilitating development of the new generation technologyof solar thermal power.Comparingwith Mn₂O₃,the initial reduction temperature ofthe new composite,Li₂Fe Mn₃O₈,decreased from 773℃to 622℃experimentally,withthe activation energy from 797.10 k J/mol to 132.44 k J/mol.The oxidation temperature decreased to 590℃,whilethe oxidation reaction heat increased up to 209.40 kJ/kg.The new composite showed an excellent reaction stability after 105 experimental cycles.