化工进展 ›› 2019, Vol. 38 ›› Issue (10): 4520-4533.DOI: 10.16085/j.issn.1000-6613.2019-0206

• 能源加工与技术 • 上一篇    下一篇

增稠剂对NH4Al(SO4)2·12H2O蓄放热性能的影响

周鑫晨(),章学来(),华维三,郑钦月   

  1. 上海海事大学蓄冷技术研究所，上海 201306
  • 收稿日期:2019-02-11 出版日期:2019-10-05 发布日期:2019-10-05
  • 通讯作者: 章学来
  • 作者简介:周鑫晨（1995—），男，硕士研究生，研究方向为储能技术、脉动热管强化蓄热传热技术。E-mail：zhouxinchenaria@sina.com。
  • 基金资助:
    上海市教委重点项目(12ZZ154)

Influence of thickeners on the heat storage and release performance of NH4Al(SO4)2·12H2O

Xinchen ZHOU(),Xuelai ZHANG(),Weisan HUA,Qinyue ZHENG   

  1. Institute of Cool Storage Technology, Shanghai Maritime University, Shanghai 201306, China
  • Received:2019-02-11 Online:2019-10-05 Published:2019-10-05
  • Contact: Xuelai ZHANG

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摘要：

利用电热恒温水槽、高低温交变试验箱搭建蓄放热实验平台，研究了9种增稠剂对NH4Al(SO4)2·12H2O蓄放热性能的影响，测试分析了NH4Al(SO4)2·12H2O改性后的循环稳定性能。结果表明，质量分数为2%的黄原胶、1%的瓜尔豆胶或1%的羟乙基纤维素均能较好改善NH4Al(SO4)2·12H2O的放热性能且对相变潜热的削弱程度不大，对应改性NH4Al(SO4)2·12H2O的主要参数变化为：熔点分别降低1.0℃、1.3℃、1.3℃，蓄热时长分别增加94%、35%、9%，蓄热相变平台分别增加125%、63%、5%，过冷度分别减小43%、45%、34%，结晶过程温度变化分别减小84%、87%、73%，放热时长分别增加27%、11%、50%，相变潜热分别减小5.8%、8.3%、4.1%。增稠剂对NH4Al(SO4)2·12H2O放热性能的改性效果会受到降解反应影响，而2%黄原胶的改性效果相对其他两种增稠剂较好，循环过程中改性材料的结晶过程温度始终保持在60℃以上。60次循环后，改性材料主要参数相比纯材料的变化为：熔点下降0.2℃，蓄热相变平台减小15%，蓄热时长增加13%，结晶过程温度变化减小87%，过冷度减小42%，放热时长增加36%，相变潜热减小1.6%。

关键词: 相变, 过冷度, 蓄热, 放热, 结晶

Abstract:

Electric thermostatic water bath and high-low temperature alternating test chamber were used to build a heat storage and release platform. Influence of 9 thickeners on the heat storage and release performance of NH4Al(SO4)2·12H2O was researched and the cycle stability of the modified NH4Al(SO4)2·12H2O was tested and analyzed. The results showed that the heat release performance of NH4Al(SO4)2·12H2O with addition of 2% xanthan gum, 1% guar gum or 1% hydroxyethylcellulose was improved respectively, and the reduction of latent heat was not significant. Under these three addition ratios, the melting point of NH4Al(SO4)2·12H2O was decreased by 1.0℃, 1.3℃, 1.3℃, respectively,the time of heat storage was increased by 94%, 35%, 9%, respectively, the time of phase change of heat storage was increased by 125%, 63%, 5%, respectively, the undercooling was decreased by 43%, 45%, 34%, respectively, the temperature variation during crystallization process was decreased by 84%, 87%, 73%, respectively, the time of heat release was increased by 27%, 11%, 50%, respectively, and the latent heat was decreased by 5.8%, 8.3%, 4.1%, respectively. The modification effect of thickener on the heat release performance of NH4Al(SO4)2·12H2O was affected by the degradation reaction, while the modification effect of 2% xanthan gum was better than the other two thickeners since the temperature variation during crystallization process of corresponding modified NH4Al(SO4)2·12H2O was always maintained above 60℃. After 60 cycles, compared with pure NH4Al(SO4)2·12H2O, the main parameters of modified NH4Al(SO4)2·12H2O changed as follows: the melting point was decreased by 0.2℃, the time of phase change of heat storage was decreased by 15%, the time of heat storage was increased by 13%, the temperature variation during crystallization process was decreased by 87%, the undercooling was decreased by 42%, the time of heat release was increased by 36%, and the latent heat was decreased by 1.6%.

Key words: phase change, undercooling, heat storage, heat release, crystallization

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