• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Membrane Science >Novel membrane and device for vacuum membrane distillation-based desalination process
【24h】

Novel membrane and device for vacuum membrane distillation-based desalination process

机译：基于真空膜蒸馏的脱盐工艺的新型膜及装置

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In vacuum membrane distillation (VMD) process for desalination, water vapor flux is strongly affected by the hot brine heat transfer coefficient and membrane mass transfer coefficient. The VMD process has been studied here using porous hydrophobic polypropylene hollow fibers having three different dimensions, two different wall thicknesses and pore sizes. The outside surface of the hollow fibers has been coated with a variety of porous/microporous plasmapolymerized silicone fluoropolymer coatings. A large number of rectangular modules having the hot brine in cross flow over the outside of the fibers and vacuum on the fiber bore side have been investigated for their VMD performances to hot brine (1% NaCl) over a brine temperature range of 60-90℃. Studies were carried out with hot water as well; further hot water flow in the tube side and vacuum in the shell side were also implemented. The shell-side Reynolds number was varied between 9 and 95. Module MXFR #3 containing larger size fibers having a much more open coating and larger pore size yielded at a high Reynolds number a water vapor flux as high as 71 kg/m~2 h from a 85℃ hot feed in cross flow. The temperature polarization was reduced considerably with the temperature polarization coefficient varying between 0.93 and 0.99. Zukauskas equation for heat transfer coefficient in cross flow over a tube bank allows one to predict the water vapor flux behavior over a wide range of Reynolds number of the shell-side brine provided an empirically determined membrane mass transfer coefficient is employed.
机译：在用于脱盐的真空膜蒸馏（VMD）工艺中，水蒸气通量受热盐水传热系数和膜传质系数的强烈影响。这里已经使用具有三种不同尺寸，两种不同壁厚和孔径的多孔疏水聚丙烯中空纤维研究了VMD工艺。中空纤维的外表面已经涂覆有各种多孔/微孔等离子体聚合的硅氧烷氟聚合物涂层。已经研究了许多矩形模块，这些模块在纤维的外侧交叉流动有热盐水，并且在纤维孔侧具有真空，其在60-90的盐水温度范围内对热盐水（1％NaCl）的VMD性能得到了研究。 ℃。研究也用热水进行。还实现了在管侧的进一步热水流动和在壳侧的真空。壳侧的雷诺数在9到95之间变化。模块MXFR＃3包含较大的纤维，具有更大的开放涂层和较大的孔径，在高雷诺数下产生的水蒸气通量高达71 kg / m〜2来自85℃的热进料以错流的方式h。温度极化系数显着降低，温度极化系数在0.93和0.99之间变化。如果使用经验确定的膜传质系数，则通过Zukauskas方程可对管束横流中的传热系数进行预测，从而可以预测壳侧盐水在雷诺数很大范围内的水蒸气通量行为。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号