Characteristics of gas-fluidised beds under pressure.

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概要

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• The behaviour of silica sand particles with mean sizes 0.3, 0.45 and 0.6 mm fluidised by air under pressures from 0.1 to 0.8 MPa was observed in a transparent two-dimensional bed. Minimum fluidisation velocity, bed expansion and bed height fluctuation were measured by the usual methods, bubble characteristics such as the size, rising velocity and frequency by cine-photography. The minimum fluidisation velocity decreased with pressure, explainable by considering the increase of the turbulent flow contribution to bed pressure drop, and fairly well described by the Wen and Yu correlation. No virtual effect of pressure on bubble size was observed but bubble shape became flattened, which in turn accompanied a decrease in the bubble rise velocity. Based on these results, the increased bed expansion and the unchanged bed fluctuation could be consistently explained.

• 公益社団法人 化学工学会の論文

著者

• KAWABATA Jun-ichi

  Government Industrial Department Laboratory

• TAZAKI YONESHIRO

  Government Industrial Development Laboratory

• CHIBA TADATOSHI

  Coal Research Institute, Hokkaido University

• YUMIYAMA MIDORI

  Government Industrial Development Laboratory

• HONMA SENJI

  Government Industrial Development Laboratory

• SUMIYA TSUTOMU

  Department of Chemical Process Engineering, Hokkaido University

• ENDO KAZUO

  Department of Chemical Process Engineering, Hokkaido University

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• Effect of perforated plate baffles on particle segregation in gas fluidised beds of solid mixtures.
• Gasification of coal char in a two-stage pressurized fluidized bed.
• Characteristics of gas-fluidised beds under pressure.

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