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Energy transfer and efficiency analysis of microwave flash evaporation with tap water as medium
Desalination ( IF 9.9 ) Pub Date : 2021-04-22 , DOI: 10.1016/j.desal.2021.115095
Shihong Tian , Lei Guo , Yongwan Gu , Shaohua Ju , Lei Xu

A microwave flash evaporation system is designed and applied to research the intensification effect of microwave on flash evaporation, in present work, a mathematic model of the energy transfer and efficiency of microwave flash evaporation (MFE) process is presented, and series of experiments used water as medium are conducted. Production rate, thermal efficiency of phase transition, thermal proportion of steam, electro-thermal conversion efficiency, and indicator parameters such as, gain output ratio (GOR), specific thermal energy consumption (STEC), and total volumetric heat transfer coefficient are calculated to evaluate energy transfer of MFE process. As a result, the production rate, thermal conversion efficiency and thermal proportion of steam increase with microwave power but decrease with flow rate, and the maximum value of electro-thermal conversion efficiency achieved 76.66%. GOR value and total volumetric heat transfer coefficient of MFE increase with microwave power but decrease with flow rate, the specific thermal energy consumption increases with flow rate but decrease with microwave power. In addition, the economy of MFE process is also discussed. This work may provide the theoretical support for the feasibility of the utilization of microwave heating in flash evaporation.



中文翻译:

以自来水为介质的微波闪蒸蒸发的能量传递和效率分析

设计并应用了微波闪蒸系统,研究了微波对闪蒸的强化作用,目前的工作是建立微波闪蒸过程能量传递和效率的数学模型,并进行了一系列用水实验。作为媒介进行。计算出生产率,相变的热效率,蒸汽的热比例,电热转换效率以及指标参数,例如增益输出比(GOR),比热能消耗(STEC)和总体积传热系数。评估MFE过程的能量转移。结果,蒸汽的生产率,热转换效率和热比例随微波功率的增加而随流量的增加而降低,电热转换效率的最大值达到了76.66%。MFE的GOR值和总体积传热系数随微波功率增加而随流量降低,比热能消耗随流量增加而随微波功率降低。此外,还讨论了MFE工艺的经济性。这项工作可以为在闪蒸中利用微波加热的可行性提供理论支持。

更新日期:2021-04-23
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