Ming Yong, Zhou Naijun
School of Energy Science and Engineering, Central South University, Changsha 410083, China.
Entropy (Basel). 2020 Nov 11;22(11):1279. doi: 10.3390/e22111279.
To recover energy from the waste heat of aluminum reduction cells, a waste heat power generation system (WHPGS) with low boiling point working fluid based on Organic Rankine Cycle was proposed. A simplified model for the heat transfer around the walls of aluminum reduction cells and thermodynamic cycle was established. By using the model developed and coded in Matlab, thermal performance analysis of the system was conducted. Results show that the electrolyte temperature and the freeze ledge thickness in the cell can significantly affect the heat absorption of the working fluid in the heat exchange system on the walls. Besides, both the output power and the thermal efficiency of the power generation system increase with the system pressure. The output power and thermal efficiency of the system can also be affected by the type of working fluid used in the system. Working fluids for the best system performance under different output pressures were determined, based on the performance analysis. This WHPGS would be a good solution of energy-saving in aluminum electrolysis enterprises.
为了从铝电解槽的废热中回收能量，提出了一种基于有机朗肯循环的低沸点工质余热发电系统（WHPGS）。建立了铝电解槽壁周围传热和热力循环的简化模型。利用在Matlab中开发并编码的模型，对该系统进行了热力性能分析。结果表明，电解槽内的电解质温度和结壳厚度会显著影响壁面热交换系统中工质的吸热量。此外，发电系统的输出功率和热效率均随系统压力的升高而增加。系统的输出功率和热效率还会受到系统中所用工质类型的影响。基于性能分析，确定了不同输出压力下具有最佳系统性能的工质。这种余热发电系统将是铝电解企业节能的一个良好解决方案。
