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tribo-charging of binary mixtures composed of coarse and fine particles in gas-solid pipe flow

Particuology 2019年第2期17卷 101-109页

作者： Haifeng Wang Farzam Fotovat Xiaotao T. Bi John R. Grace Department of Chemical Engineering China University of Mining and Technology. Xuzliou 221166 China Department of Chemical and Petroleum Engineering Sharif University of Technology Azadi Avenue P.O. Box 11365-9465 Tehran Iran Fluidization Research Centre Department of Chemical and Biological Engineering University of British Columbia. Vancouver V6T 1Z3 Canada

Experiments were conducted to investigate the effect of adding fines on the tribo-charging of coarse glass beads. Four types of fines, i.e., copper, stainless steel, uncoated and silver-coated fine glass beads, mixed w让h 240-830 μm glass beads were conveyed by air through a stainless-steel spiral pipe acting as a tribo-charger. Regardless of the type or electrical conductivity of the fine particles tested, adding small amounts of fines (up to 10wt%) to coarse glass beads resulted in a sharp increase in the mass and surface charge densities of the particles. In gen eral, the profiles of the mass and surface charge den sides of the fine-coarse particle mixtures as a function of the mixture composition were determined by the relative magnitude of contact potential differences and the total surface areas of all the comp on ents. The domi nant particle tri bo-electrification mecha nism switched from coarse particle-wall con tacts to fine particle-wall contacts when the fines weight percentage in the mixture exceeded 10%. A model was developed to predict the mass charge density of bi nary mixtures as a function of the mixture composition.

关键词： tribo-charging Electrostatics Fine particles Binary mixture Gas-solid flow

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