The exhaust gas of petrifaction industry contain volatile organic compounds(VOCs),it is not only hurtfully to animals and plants without controlling but also lost lots of energy and cost,so it is necessary to be recovered. Membrane is a new technology in cleaning process,it have more effects ability to recover VOCs with condensation technology and reduce the cost and energy. Membranes in module type have high working area, simple operation and it can#t buy form the market easily,so the spiral wound module is our target to develop. The most important part in the spiral-wound module is spacer. The spacer serves both as mechanical stabilizer for channel geometry and turbulence promoters for reducing polarization phenomena near the membrane surface. A sub-project concerning spacer design has been delegated to the R&D Center of Membrane Technology,Chung Yuan University. Effect of spacer design on fluid flow and separation efficiency in a spiral-wound module was conducted using computational fluid dynamic (CFD) technique. Three kinds of fluids,water,toluene and isopentane are adopted for this study.Results showed that increase of the curvature of spacer will result in increase of pressure drop and shear rate.An optimum curvature of 60o of spacer provided a minimum pressure drop and a maximum shear rate at wall are suggested in designing of the spacer.Results also depicts that properties of fluid could affect the flow pattern and shear stress contour in spiral-wound module. Result shows that the selectivity is 26 in small flow rate system, but it is strength in high flow rate system. The concentration is reducing 73.4% in retentate side and increasing 8.67% in permeate side. We can use membrane technology in recovering VOCs process and it can also use in similar processes by changing different kinds of membrane module or adjusting operation system and conditions.

Membrane、Module、Voltaic Organic Compounds（VOCs）