豬籠草 asked in 科學工程學 · 1 decade ago

流動床 (fluid bed dryer)

我在寫一篇有關機械的論文,

需要關於食品原料加工所使用的流動床 (fluid bed dryer)的資料,

作用原理,以及操作方法,實例參數,越詳細越好。

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  • 1 decade ago
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    流動床是設計把物料漂浮在空氣或氣體形成的氣墊上進行乾燥。

    The process air is supplied to the bed through a special perforated distributor plate and flows through the bed of solids at a velocity sufficient to support the weight of particles in a fluidized state. Bubbles form and collapse within the fluidized bed of material, promoting intense particle movement. In this state, the solids behave like a free flowing boiling liquid. Very high heat and mass transfer values are obtained as a result of the intimate contact with the solids and the differential velocities between individual particles and the fluidizing gas.

    For even greater thermal efficiency and where inertisation is required, recycling of exhaust gases can be used. This can be implemented on all our airstream drying systems and retrofitted on customer's existing drying operations.

    Contact tubes can be incorporated with non-cohesive materials that can be processed at temperatures approaching the fluid within the tubes. The result is a significant reduction in airflow compared with the typical standard fluid bed.

    Many materials begin at or pass through a sticky, softening or cohesive phase during processing. Vibrating beds are extremely effective in keeping the material in a live fluidized state during this transitionary phase.

    Batch and continuous units ranging from pilot scale to 300 ft2 (28 m2) have been supplied.

    The fluid bed has been used to dry products in many industries including food, chemical, mineral and polymer. A broad range of feed materials including powders, crystals, granules and prills can be processed.

    This technology can also be used for cooling applications; either as a separate unit or combined with drying in a single zoned bed.

    Open circuit fluid bed dryer / cooler

    圖片參考:http://www.barr-rosin.com/images/products/open_cir...

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