Effect of Temperature and Dust Properties on the Filtration and Cleaning Characteristics of Candle-Type Ceramic Filters

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  • Hata Mitsuhiko
    Graduate School of Natural Science and Technology, Kanazawa University
  • Furuuchi Masami
    Graduate School of Natural Science and Technology, Kanazawa University
  • Okamoto Taiju
    Graduate School of Natural Science and Technology, Kanazawa University
  • Seki Hirakazu
    Graduate School of Natural Science and Technology, Kanazawa University

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  • セラミックフィルタによる集塵・払い落とし性に及ぼす温度および粒子特性の影響
  • セラミック フィルタ ニ ヨル シュウジン ハライオトシセイ ニ オヨボス オンド オヨビ リュウシ トクセイ ノ エイキョウ

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Abstract

The dust collection and cleaning process of a candle-type ceramic filter were tested by use of two fly ashes with different geometries and thermal properties at temperatures of 200, 500 and 800°C. The shear strength of ash samples was tested at the same temperatures as the filtration to help predict the adhesive forces between ash particles. Data from this study were compared with data from the literature in examing the influences of filtration conditions using the ash properties of the void fraction of the dust layer in order to evaluate the cleaning efficiency of ceramic filters.<br>Four forces acting on the particles collected on the filter surface were examined as influencing factors on the structure of the dust layer. The non-dimensional packing parameter Π=FC−2FI1FV−1FG2 was found to represent the dust layer porosity, where FC is the adhesive force between particles, FI the inertial force, FV the drag force acting on a particle moving in the gas and FG the gravity force.<br>The cleaning force σr and the adhesive force σc, acting on the particle layer, were examined as influencing factors to predict the cleaning efficiency. The force ratio Γ=σr/σc was found to describe the behavior of dust cleaning efficiency η, which increases significantly in the region 1<Γ<10.<br>Although further detailed analysis is required, the analysis of forces acting on particles and on particle layers was found to be valid for evaluation of hot gas filtration and the cleaning characteristics of ceramic filters.

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