Thermodynamic investigation of water generating system through HDH desalination and RO powered by organic Rankine cycle
Thermodynamic investigation of water generating system through HDH desalination and RO powered by organic Rankine cycle
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HDH 海水淡化和有机朗肯循环反渗透制水系统的热力学研究
DOI：
10.1016/j.matpr.2020.08.636
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
G. Nandan
中科院分区：
文献类型：
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作者：
Rishabh Kumar;A. Shukla;M. Sharma;G. Nandan
本文提出了一种利用海军舰船余热，采用低温有机朗肯循环，通过增湿-脱盐装置和反渗透有机朗肯循环的方式，实现发电和饮用水的双重利用的制水系统。来自海军船舶的废热用于运行顶循环，即用于发电的有机朗肯循环，其操作用于饮用水的RO系统。一个水加热加湿器（HDH）脱盐装置也与有机朗肯循环系统集成，以产生额外的淡水。设计了质量和能量平衡方程，分析了设计工况下电-水系统热电联产的热力性能。用于有机朗肯循环的合适的工作流体是基于热物理性质来选择的，即较低的沸点、临界温度和压力以及全球变暖潜能。此外，还分析了抽汽压力、抽汽比、凝汽器温度、涡轮机进口压力等重要参数对性能的影响。结果表明，抽气参数对循环、净功率、总效率和产水量的影响分别为16.74 kW、42.10%和75.18 kg h− 1。提取比的变化导致产水量和发电量的提高，并且较低的提取比具有更好的效果。所使用的RO系统是直接机械耦合，其使用功率来运行系统并产生水，分别使用16.74 kW功率产生2.4 L饮用水。
The present study proposed the water generating system through humidification-dehumidification desalination unit and RO powered by organic Rankine cycle to generate both power and drinking water from the waste heat of Naval Ship by using a low-temperature organic Rankine cycle. Waste heat from the naval ship is used in order to run the topping cycle namely the organic Rankine cycle for power generation which operates the RO system for drinking water. A water-heated humidification dehumidification (HDH) desalination unit is also integrated with the organic Rankine cycle system to produce additional freshwater. The mass and energy balance equations are designed to analyze the thermodynamic performance of the cogeneration of the power-water system at the designed conditions. Suitable working fluids for the organic Rankine cycle are chosen on the basis of thermophysical properties i.e. lower boiling point, critical temperature & pressure and global warming potential. Furthermore, the impact of various vital parameters like extraction pressure, vapor extraction ratio, condenser temperature, turbine inlet pressure, etc. on the performance. It was founded that the impact of extraction parameters on the cycle, the net power, total efficiency and water production is 16.74 kW, 42.10% and 75.18 kg h−1respectively. The extraction ratio variation causes the improvement in the water production and power generation and lower extraction ratio has better results. The RO System used is direct mechanical coupling which uses the power to run the system and produces the water, 2.4L of drinking water is produced using 16.74 kW power, respectively.