Experimental Investigation of a Spiral-Wound Pressure-Retarded Osmosis Membrane Module for Osmotic Power Generation
Experimental Investigation of a Spiral-Wound Pressure-Retarded Osmosis Membrane Module for Osmotic Power Generation
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DOI：
10.1021/es304060d
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发表时间：
2013-03-19
影响因子：
11.4
通讯作者：
Lee, Kong Hoon
中科院分区：
文献类型：
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作者：
Kim, Yu Chang;Kim, Young;Lee, Kong Hoon
压力延迟渗透（PRO）使用半透膜从盐度梯度能量中产生可再生能源。螺旋缠绕（SW）设计是PRO膜的一种模块配置。SW PRO膜组件具有两种不同的流路（轴向和螺旋）和两种不同的间隔件（网和特里科），分别用于汲取和进料溶液流。本研究使用实验方法来研究原型SW PRO膜组件中两个相互作用的流动流之间的关系，以及特里科织物间隔物（作为进料间隔物）对PRO性能（包括水通量和功率密度）的不利影响。膜包封内的特里科间隔物的存在由于流动阻力引起压降，并且由于阴影效应引起渗透水渗透减少。通过水渗透稀释汲取溶液导致沿着压力容器的渗透压差减小。对于0.6 M NaCl溶液和自来水，在9.8 bar的液压差下，水通量和相应的最大功率密度分别为3.7 L m（-2）h（-1）和1.0 W/m（2）。应优化特里科间隔物的厚度和孔隙率以实现高SW PRO模块性能。
Pressure-retarded osmosis (PRO) uses a semipermeable membrane to produce renewable energy from salinity-gradient energy. A spiral-wound (SW) design is one module configuration of the PRO membrane. The SW PRO membrane module has two different flow paths, axial and spiral, and two different spacers, net and tricot, for draw-and feed-solution streams, respectively. This study used an experimental approach to investigate the relationship between two interacting flow streams in a prototype SW PRO membrane module, and the adverse impact of a tricot fabric spacer (as a feed spacer) on the PRO performance, including water flux and power density. The presence of the tricot spacer inside the membrane envelope caused a pressure drop due to flow resistance and reduced osmotic water permeation due to the shadow effect. The dilution of the draw solution by water permeation resulted in the reduction of the osmotic pressure difference along a pressure vessel. For a 0.6 M NaCl solution and tap water, the water flux and corresponding maximum power density were 3.7 L m(-2)h(-1) and 1.0 W/m(2) respectively at a hydraulic pressure difference of 9.8 bar. The thickness and porosity of the tricot spacer should be optimized to achieve high SW PRO module performance.