有机朗肯循环驱动反渗透海水淡化运行模式及工质选择
发布时间：2018-11-09 07:41
【摘要】：针对水资源短缺及能源浪费两大问题,对有机朗肯循环(ORC)耦合反渗透(RO)海水淡化的复合系统进行优化设计,利用膨胀机驱动高压泵,海水吸收冷凝器中有机工质的热量,进而提高海水淡化的回收率。并采用热力学分析方法分析了纯工质、混合工质组分比例、海水进水温度、进水流量变化对循环性能的影响。结果表明:在系统相同吸热量、工质和海水环境温度下,以R245fa为例,经过冷凝器预热后的淡水产量比不经过冷凝器预热的淡水产量提高80%以上;混合工质由于存在温度滑移,淡水产量均大于其相应的纯工质,其中R134a/R245fa(0.5/0.5)产水量最佳,在海水温度为12℃时比R245fa提高10.01%,在18℃时比R245fa提高25.04%;在系统运行方面,当高压泵进水温度小于40℃时,海水流量取决于高压泵的功率,当海水温度超过反渗透膜的工作温度时,需要打开系统的放水阀,通过原水泵增加冷凝器的海水流量,多余的水由放水阀排出,此时混合工质相对于纯工质的产水优势更为明显。
[Abstract]:Aiming at the two problems of water resources shortage and energy waste, the composite system of organic Rankine cycle (ORC) coupled reverse osmosis (RO) desalination is optimized. The expansion machine is used to drive the high pressure pump. Seawater absorbs the heat of organic working fluid in condenser and improves the recovery rate of seawater desalination. The effects of the pure working fluid, the proportion of mixed working fluid, the influent temperature and the influent flow rate on the circulation performance were analyzed by thermodynamics analysis method. The results show that under the same system heat absorption, working fluid and seawater environment temperature, taking R245fa as an example, the fresh water production after preheating by condenser is more than 80% higher than that without condenser preheating. Due to the existence of temperature slippage, the fresh water production of the mixed working fluid is higher than that of its corresponding pure working medium. R134a/R245fa (0.5 / 0.5) has the best water yield, and the water yield is 10.01% higher than that of R245fa at 12 鈩，
本文编号：2319783
[Abstract]:Aiming at the two problems of water resources shortage and energy waste, the composite system of organic Rankine cycle (ORC) coupled reverse osmosis (RO) desalination is optimized. The expansion machine is used to drive the high pressure pump. Seawater absorbs the heat of organic working fluid in condenser and improves the recovery rate of seawater desalination. The effects of the pure working fluid, the proportion of mixed working fluid, the influent temperature and the influent flow rate on the circulation performance were analyzed by thermodynamics analysis method. The results show that under the same system heat absorption, working fluid and seawater environment temperature, taking R245fa as an example, the fresh water production after preheating by condenser is more than 80% higher than that without condenser preheating. Due to the existence of temperature slippage, the fresh water production of the mixed working fluid is higher than that of its corresponding pure working medium. R134a/R245fa (0.5 / 0.5) has the best water yield, and the water yield is 10.01% higher than that of R245fa at 12 鈩，
本文编号：2319783
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