Performance improvement on distillate flux of countercurrent-flow direct contact membrane distillation systems
Performance improvement on distillate flux of countercurrent-flow direct contact membrane distillation systems
复制标题
DOI：
10.1016/j.desal.2014.01.023
复制
发表时间：
2014-04
期刊：
影响因子：
9.9
通讯作者：
Chii-Dong Ho;Cheng-Hao Huang;F. Tsai;Wei-Ting Chen
中科院分区：
文献类型：
--
作者：
Chii-Dong Ho;Cheng-Hao Huang;F. Tsai;Wei-Ting Chen
在逆流操作条件下，对采用粗糙表面强化传热的平行板直接接触膜蒸馏（DCMD）组件的纯水产率进行了理论预测。与并流操作相比，在盐水脱盐中，随着纯水生产率的增加，实现了装置性能的改善。粗糙化表面的制作，使用虹吸喷砂与氧化铝（Al2O3）砂颗粒和电弧喷涂镍膜涂层，并在一个简化的表达式，预测的DCMD装置的传热系数的实验数据进行了关联。以流体流速和入口盐水温度为参数，以图形方式表示热、冷进料流的纯水生产率和温度分布。流型和粗糙表面效应都证明了粗糙表面通道装置的技术可行性，逆流DCMD系统的装置性能提高了42.11%。以能耗为代价，讨论了操作参数和设计参数对纯水产率的影响。
The theoretical predictions of pure water productivity in a parallel-plate direct contact membrane distillation (DCMD) module using roughened-surface flow channel for enhancing heat transfer enhancement were obtained under countercurrent-flow operations. The device performance improvements with increasing the pure water productivity in saline water desalination were achieved as compared to the concurrent-flow operation. The roughened surface was fabricated using siphonic-blasting with aluminum oxide (Al2O3) sand grains and arc spraying for Ni film coating, and the experimental data were correlated in a simplified expression to predict the heat transfer coefficient for the DCMD device. The pure water productivity and temperature distributions of both hot and cold feed streams are represented graphically with the fluid flow rate and inlet saline temperature as parameters. Both flow-pattern and roughened-surface effects have demonstrated the technical feasibility in the roughened-surface channel device and up to 42.11% of the device performance enhancement was achieved for the countercurrent-flow DCMD system. The influences of operation and design parameters on the pure water productivity with the expense of energy consumption are also discussed.