Humidity-control assists high-efficient coal fly ash removal by PTFE membrane |
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| Authors: | Dongyan Li Xi Tang Shasha Feng |
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| Affiliation: | 1. Chemical Engineering Department, Nanjing Polytechnic Institute, Nanjing 210048, China;2. State Key Laboratory of Materials-Oriented Chemical Engineering, National Engineering Research Center for Special Separation Membrane, Nanjing Tech University, Nanjing 210009, China |
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| Abstract: | In the present study, the effects of relative humidity on filtrating coal-fired fly ash with hydrophobic poly tetra fluoroethylene (PTFE) membranes were investigated. The intergranular force of particulate matter at different RH conditions was measured by analyzing the critical angle between particles. Effects of humidity (from 30% to 70%) on filtration pressure drop and membrane fouling conditions were characterized. It was found the membrane showed optimal filtration resistance of 530 Pa at RH of 60% and the gas permeance can be maintained at 1440 m3·m-2·h-1·kPa-1. Moreover, to optimize the operation parameters for this filtration system, effects of fly ash concentration, diameter, membrane pore size, and gas velocities were systematically investigated. |
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| Keywords: | Relative humidity Collapse angle Pressure drop Poly tetra fluoroethylene (PTFE) membrane Fly ash |
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