热能储存是提高能量利用效率的重要途径。基于Ca(OH)2/CaO的流态化热化学储热可实现大规模热能的快速储存和释放，因此研究Ca(OH)2/CaO在流态化条件下的反应动力学尤为重要。热重分析仪（TGA）无法为Ca(OH)2提供恒温反应条件,且传质抑制现象显著。基于此，提出了一种快速反应热重分析仪，相比常规TGA，其可为Ca(OH)2/CaO提供更接近流态化的反应条件。通过快速移动高温反应器和实施高速吹扫气，快速反应热重分析仪可为储热材料提供更高的升温速率和更好的传质条件。通过一系列解耦试验，明确了反应器温度、反应器移动速度和吹扫气流对快速反应热重分析仪性能的影响。利用分析纯Ca(OH)2进行测试，对比快速反应热重分析仪和TGA获得的材料转化率，发现偏差仅为0.81%，证明了快速反应热重分析仪的准确性。

Thermal energy storage is necessary for improving energy utilization efficiency. Using Ca(OH)2/CaO in fluidized bed reactors can realize rapid storage and release large-scale thermal energy, and hence, research on the reaction kinetics of Ca(OH)2/CaO under fluidization is important. However, the thermogravimetric analysis (TGA) technique cannot provide the constant temperature reaction conditions required for Ca(OH)2, and its mass transfer inhibition phenomenon is significant. Hence, a fast-reaction TGA technique was proposed that can provide reaction conditions closer to those of fluidization for Ca(OH)2/CaO, when compared with the conventional TGA technique. The fast-reaction TGA technique could provide a higher heating rate and better mass transfer conditions for heat storage material by rapidly moving the high-temperature reactor and introducing a high-speed purge gas. The influence of the reactor temperature, moving speed and airflow on the fast-reaction TGA performance was clarified by decoupling experiment. When tested with Ca(OH)2, the deviation in the material conversion obtained with the fast-reaction TGA technique from that obtained with the conventional TGA technique is only 0.81%, which demonstrates the accuracy of the fast-reaction TGA. 

0 引言

1 材料与方法

1.1 快速反应TGA

   1.2 Ca(OH)2样品的性质

2 结果和讨论

   2.1 气流对不锈钢盘管换热的影响

   2.2 在快速反应TGA技术中创造高加热速率

   2.3 称重模块在环境温度下工作时的稳定性

   2.4 称量模块在高温下工作的稳定性

   2.5 Ca(OH)2分解反应的快速反应TGA的精密度和准确度

3 结论