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Experimental study on differences of heat and mass flux on opposite side of a 10-nm nanoporous ceramic membrane tube
Heat and Mass Transfer ( IF 2.2 ) Pub Date : 2019-07-22 , DOI: 10.1007/s00231-019-02711-0
Haiping Chen , Boran Yang , Chao Ye , Yijun Feng , Xiangsheng Li

Abstract

A nanoporous ceramic membrane tube (CMT) is able to extract water vapor and latent heat from gas mixture, such as flue gas exhausted from thermal power plant, because of its excellent permselectivity and heat-exchange capacity. However, due to the effect of the gravity force on condensation film formation and condensate permeation process, the water and heat-recovery performance on top and bottom parts of a horizontal CMT may be distinct. In this study, a corresponding experiment was performed to verify and research the phenomenon by installing six equidistant and symmetrical measuring points at top and bottom parts of the experimental CMT module, respectively. According to the experimental data, the local temperature of cooling water on top (Tc,l,t) and bottom (Tc,l,b) parts of CMT module exhibited a distinct changing tendency, and the maximum temperature difference (ΔTc) could approach 2.68 °C. Typically, the effects of gravity force on condensation film was negligible, while the permeation capacity of condensate was influenced by gravity force apparently. Moreover, most of condensate (92.24% maximally) was generated during the normal condensation process, merely a small proportion of condensate was produced by the capillary condensation process. This paper is useful for horizontal membrane type gas-water technology improvement.



中文翻译:

10 nm纳米多孔陶瓷膜管相对侧热与质量通量差异的实验研究

摘要

纳米多孔陶瓷膜管(CMT)具有出色的渗透选择性和热交换能力,能够从混合气体中提取水蒸气和潜热,例如从火力发电厂排出的烟道气。但是,由于重力对冷凝膜形成和冷凝水渗透过程的影响,卧式CMT顶部和底部的水和热回收性能可能会有所不同。在这项研究中,通过在实验CMT模块的顶部和底部分别安装六个等距和对称的测量点,进行了相应的实验以验证和研究该现象。根据实验数据,冷却水在顶部(T c,l,t)和底部(T c,l,b)的局部温度CMT模块的)部分表现出不同的变化趋势,和最大温度差(ΔT Ç)可能接近2.68℃下。通常,重力对冷凝膜的影响可以忽略不计,而冷凝液的渗透能力显然受到重力的影响。此外,大部分冷凝物(最大92.24%)在正常冷凝过程中产生,而毛细管冷凝过程仅产生一小部分冷凝物。本文对水平膜式气水技术的改进很有用。

更新日期:2020-01-04
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