Enhanced removal efficiency of particles smaller than 2.5 μm by diffusiophoresis and thermophoresis in gas-liquid cross-flow array

Z. Zheng, J. Zhu*, S. Xia, Sichuan University, China; T. Laminger, W. Höflinger, Vienna University of Technology, Austria

An innovative technique for particle (dp<2.5μm) removal from industrial exhausts through a Gas-liquid Cross-flow Array (GLCA) is reported. The GLCA is formed by wastewater vertically down flowing along a number of staggered arrangement wires. The self-renewable water films on the surface of wires act as independent sink each to collect particles flowing across it. The majority of particles captured obtain surface orientated movement owing to the forces of diffusiophoresis (DP) and thermophoresis (TP), which are induced by vapor concentration gradient and temperature gradient in boundary layer around the film surface. Therefore the temperature and humidity in exhausts bulk over that in gas-liquid interface play the key function for particle collection in GLCA, as the model prediction of particle grade removal efficiency higher than 90% for exhausts saturated under in-let temperature 85℃ flowing across a GLCA with wastewater temperature 20℃.

Experimental results obtained on a lab-scale test rig under certain conditions clearly display the particle number concentration decrease with the increase of row numbers flowing cross in a GLCA, as shown in...

Session: G12 - Combined Technologies
Day: 12 October 2016
Time: 16:45 - 18:00 h

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