有机朗肯循环驱动反渗透海水淡化运行模式及工质选择

doi:10.16085/j.issn.1000-6613.2017-0233

化工进展 ›› 2017, Vol. 36 ›› Issue (10): 3639-3647.DOI: 10.16085/j.issn.1000-6613.2017-0233

有机朗肯循环驱动反渗透海水淡化运行模式及工质选择

刘秀龙, 曹泷, 苗政, 张鸣, 谢学旺, 徐进良

华北电力大学低品位能源多相流与传热北京市重点实验室, 北京 102206

收稿日期:2017-02-16 修回日期:2017-03-23 出版日期:2017-10-05 发布日期:2017-10-05
通讯作者: 徐进良,教授,博士生导师,主要从事多相流传热和低品位热源利用技术研究.
作者简介:刘秀龙(1991-),男,硕士研究生,主要从事低品位热源利用技术研究.E-mail:jiliuxiulong@sina.com.
基金资助:
国家自然科学基金国际合作与交流项目（51210011）及自然科学基金项目（51306048）。

Operation mode and working fluid selection for organic Rankine cycle coupled with reverse osmosis desalination

LIU Xiulong, CAO Shuang, MIAO Zheng, ZHANG Ming, XIE Xuewang, XU Jinliang

Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy, North China Electric Power University, Beijing 102206, China

Received:2017-02-16 Revised:2017-03-23 Online:2017-10-05 Published:2017-10-05

摘要/Abstract

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。

关键词: 有机朗肯循环, 海水淡化, 优化设计, 泵, 热力学, 混合物, 淡水产量

Abstract: In view of the problems of water shortage and energy waste,the optimization design of organic Rankine cycle(ORC)coupled with reverse osmosis(RO)desalination was presented in this paper. The high pressure pump was driven by expander,and seawater entered the condenser cooling from the organic fluid out of the expander which can improve the recovery rate of desalination. The paper analysed effects of the pure working fluid,ratio of mixture components,seawater inlet temperature and seawater flow rate on the cycle performance by the method of thermodynamic analysis. In the same heat absorption,working fluid and seawater temperature,the results showed the water production of the system that seawater is heated by the condenser is 80% higher than the system that is not preheated. Then fresh water production of zeotropic mixtures is greater than pure fluid because of the temperature slip. Aiming at water production function,R134a/R245fa(0.5/0.5)is the best working fluid. It is 10.01% higher than R245fa at 12℃ and 25.04% higher than R245fa at 18℃. In the operation of the system,when the high-pressure pump seawater inlet temperature less than 40℃,the water flow depends on the power of high-pressure pump. When the water temperature exceeds the working temperature of the reverse osmosis membrane,the system need to open the drain valve and increase the water flow of the condenser and the excess water discharged from the drain valve. At the same time,the advantage of zeotropic mixtures is better than pure working fluid.

Key words: organic Rankine cycle, desalination, optimal design, pump, thermodynamics, mixtures, fresh water production

中图分类号:

TK114

刘秀龙, 曹泷, 苗政, 张鸣, 谢学旺, 徐进良. 有机朗肯循环驱动反渗透海水淡化运行模式及工质选择[J]. 化工进展, 2017, 36(10): 3639-3647.

LIU Xiulong, CAO Shuang, MIAO Zheng, ZHANG Ming, XIE Xuewang, XU Jinliang. Operation mode and working fluid selection for organic Rankine cycle coupled with reverse osmosis desalination[J]. Chemical Industry and Engineering Progress, 2017, 36(10): 3639-3647.

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有机朗肯循环驱动反渗透海水淡化运行模式及工质选择

Operation mode and working fluid selection for organic Rankine cycle coupled with reverse osmosis desalination

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