Optimizing the energy recovery section in thermal desalination systems for improved thermodynamic, economic, and environmental performance
Optimizing the energy recovery section in thermal desalination systems for improved thermodynamic, economic, and environmental performance
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DOI：
10.1016/j.icheatmasstransfer.2021.105244
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发表时间：
2021-05
影响因子：
7
通讯作者：
M. Jamil;Talha S. Goraya;K. Ng;S. Zubair;B. Xu;M. Shahzad
中科院分区：
文献类型：
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作者：
M. Jamil;Talha S. Goraya;K. Ng;S. Zubair;B. Xu;M. Shahzad
从热力学、经济和环境的角度来看，能源回收部分与热脱盐系统的集成提高了它们的性能。这是因为它大大减少了输入能量，传热面积和资本成本要求。最重要的是，系统出口流可以通过为有用的预热目的提供热量来实现与环境的热平衡，从而减少对环境的影响。板式换热器通常用作预热器。本文对这些热交换器在热脱盐系统中的应用进行了全面的研究和优化。采用归一化灵敏度分析和基于遗传算法的成本优化方法，建立了实验验证的数值模型，研究了它们在不同工况下的性能。分析表明，随着进料流量的增加，换热系数、压降和出水成本均有所提高。但随着流量的增大，由于压降增大程度较大，综合输出参数h/ΔP减小。此外，增加v形角可以降低换热系数、压降和水成本。优化后的换热面积减少~79.5%，资金投入减少~62%，冷流出口成本减少~15.7%。由于压降增加，操作成本增加，但总体影响是有益的，因为设备的总重量减少了约52.7%。
Integration of energy recovery section with thermal desalination systems improves their performance from thermodynamics, economics, and environmental viewpoints. This is because it significantly reduces input energy, heat transfer area, and capital cost requirements. Above all, the system outlet streams can achieve thermal equilibrium with the environment by supplying heat for useful preheating purposes thus reducing the environmental impacts. The plate heat exchangers are generally employed for this purpose as preheaters. The current paper presents a comprehensive investigation and optimization of these heat exchangers for thermal desalination systems applications. An experimentally validated numerical model employing Normalized Sensitivity Analysis and Genetic Algorithm based cost optimization is developed to investigate their performance at assorted operating conditions. The analysis showed that the heat transfer coefficient, pressure drop, and outlet water cost were improved by an increase in feed flow rate. However, with an increased flow rate, the comprehensive output parameter (h/ΔP) decreased due to the high degree increase in pressure drop. Moreover, an increase in the chevron angle reduced the heat transfer coefficient, pressure drop, and water cost. Finally, the optimization lowered the heat transfer area by ~79.5%, capital investment by ~62%, and the outlet cost of the cold stream by ~15.7%. The operational cost is increased due to the increased pressure drop but the overall impact is beneficial as Ctotalof equipment is reduced by ~52.7%.