Abstract: Comparison experiment for low temperature waste heat recovery was conducted between two thermal storage materials, namely cordierite-mullite honeycomb regenerator and industrial paraffin wax. The results show that the reasonable cycle time is five minutes. Both of heat charge and discharge characteristics of cordierite-mullite honeycomb regenerator are better than those of industrial paraffin wax. The process of heat charge is faster than heat discharge for the two materials. The temperature efficiencies of cordierite-mullite honeycomb regenerator and industrial paraffin wax are 42.45% and 35%, respectively. Both materials are cheap and easy to transport and store. They will have a good application prospect in the field of low-grade waste heat recovery.

Key words: low-grade waste heat recovery, heat storage materials, phase change materials (PCM), heat charging and discharging performance

摘要： 在自行搭建的低温余热能源回收系统上, 以堇青石?莫来石蜂窝蓄热体和工业石蜡为蓄热材料, 进行低品位能余热回收利用实验。考察蓄热体种类、主要工艺参数?换向周期等对余热回收率的影响, 并结合工业石蜡DSC分析结果, 探讨相变蓄热材料对蓄放热性能的影响机制。结果表明: 合理换向周期为5分钟; 蜂窝蓄热体的蓄放热速率均大于工业石蜡的蓄放热速率; 两种蓄热材料的放热过程均快于蓄热过程; 实验条件下, 两种蓄热材料的总温度效率分别为41.45%和35%。两种材料价格便宜, 储存运输便利, 在中低温余热回收领域具有较好的应用前景。

关键词: 低品位余热回收, 蓄热材料, 相变材料(PCM), 蓄放热性能