• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Separation and Purification Technology >Air gap membrane distillation 2.Model validation and hollow fibre module performance analysis
【24h】

Air gap membrane distillation 2.Model validation and hollow fibre module performance analysis

机译：气隙膜蒸馏2.模型验证和中空纤维组件性能分析

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 this paper the experimental results of counter current flow air gap membrane distillation experiments are presented and compared with predictive model calculations.Measurements were carried out with a cylindrical test module containing a single hollow fibre membrane in the centre and a well-defined air gap situated around the fibre.The experimental results show that the previous developed predictive model,with membrane parameters determined from gas permeation experiments,describes correctly the dependence of water vapour flux on temperature level,temperature difference,air gap total pressure,hot water flow and membrane type.At atmospheric air gap pressure,the measured fluxes per saturated water vapour pressure difference between the bulk flows(0.08-0.10 kg/m~2h mbar)are comparable with those presented in literature.A reduction of the total air gap pressure to the saturated water vapour pressure of the hot water feed flow temperature of 65 deg C,raises the flux by a factor of three.Next to the water vapour flux,the energy efficiency of the process is very important.The measured energy efficiencies(typically 85-90% for a 3 mm air gap and a hot water feed temperature of 65 deg C)are slightly below the theoretical values(95-98%),which could be explained by a small heat loss to the surroundings.For air gaps of 1.5 mm or smaller,the energy efficiency is reduced to less than 70%,due to thermal conduction across product water bridges between the membrane fibre and the condenser surface.An optimal air gap is about 3 mm wide and has a total pressure that is equal to or slightly below the saturated water vapour pressure of the hot water entering the hollow fibre membrane.
机译：本文介绍了逆流气隙膜蒸馏实验的实验结果，并将其与预测模型计算进行了比较。测量是使用圆柱形测试模块进行的，该测试模块的中心装有单个中空纤维膜，并且气隙明确实验结果表明，先前开发的预测模型具有通过气体渗透实验确定的膜参数，可以正确描述水蒸气通量与温度水平，温差，气隙总压力，热水流量和膜类型的关系。在大气压下，测得的总流量之间的每饱和水蒸气压差（0.08-0.10 kg / m〜2h mbar）的通量与文献中的结果相当。将总气隙压力降低至饱和热水进水温度为65摄氏度时的水蒸气压力将通量提高了三倍。除水蒸气通量外，该过程的能源效率非常重要。测得的能源效率（对于3 mm的气隙和65℃的热水温度通常为85-90％）略低于理论值（95-98％），这可能是由于周围环境的热损失小所致。对于1.5 mm或更小的气隙，由于在产品之间的产品水桥之间的热传导，能量效率降低到了70％以下。最佳气隙约3 mm宽，总压力等于或略低于进入中空纤维膜的热水的饱和水蒸气压。

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