Abstract
An innovative corrugated falling-film channel was proposed for industrial fly ash capture. To take advantage of the thermophoretic effect, the low-grade waste heat can be utilized to preheat the dusty gas before entering the next capture unit. The thermophoretic capture was investigated by calculating the ash particle trajectories and the temperature gradient field in the corrugated channel. It shows that the particles are highly dispersed in the corrugated channel, which provides them a higher probability to get close to the falling-film capture surface; the corrugated channel has more high gradient zones than the parallel plate, which makes particles more easily captured by the falling-film with greater thermophoretic force. The temperature difference has a greater promoting effect on the particles less than 1 μm, while the promoting effect on the large particle over 10 μm is almost negligible. And the capture efficiency enhancement rate is reduced with the rise of Re. The thermophoretic capture model for the corrugated channel was also established and validated by experimental results, and it can be also adopted to calculate the thermophoretic capture efficiency of different corrugated structures.
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