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傳導傳熱干燥設備有哪些應用
傳導干燥也稱接觸干燥,對于潮濕顆粒非常適應,而傳導干燥機熱效率較高。蒸發的水蒸汽或有機溶劑由真空抽出或用少量氣流排出,耙…

傳導干燥也稱接觸干燥,對于潮濕顆粒非常適應,而傳導干燥機熱效率較高。蒸發的水蒸汽或有機溶劑由真空抽出或用少量氣流排出,耙式干燥機氣流是濕分的主要載體,對于熱敏性顆粒狀物料建議用真空操作。在傳導干燥機中,槳葉干燥機用于干燥膏狀物料。具有內流管的旋轉式干燥機現已設計出來并已投入使用。
傳導傳熱中,由夾套、攪拌、傳熱管等將熱量供給干燥物料,用熱媒而不用熱空氣。代表性的設備是槽型的圓筒干燥機。圓錐攪拌干燥機、夾套和內置加熱管回轉干燥機、鼓式干燥機、耙式干燥機、真空帶式干燥機、真空冷凍干燥機等。在熱空氣干燥中,恒速干燥時期的溫度相當于濕球溫度。而在傳導傳熱干燥中,需要人為地創造加熱面,使傳熱面積小而傳熱系數增加。這樣,結構就比較復雜,設備投資比熱空氣干燥機大。
傳導干燥法通過金屬等蜀面間接傳遞干燥所需要的熱量。干燥速率比直接干燥法低。恒速干燥期間產品溫度與加熱源的溫度沒有關系,大體與裝置內氣體壓力的飽和溫度相同。為了提高干燥速率和防止干燥不均,通常用機械攪拌或使容器本身旋轉,以增加或不斷更新物料的傳熱面,因此有必要深入研究傳熱機構的附著問題。干燥裝置本身價格昂貴,但其特點是集塵系統的負荷小,熱效率高,溶劑容易回收,總的費用比直接干燥法便宜得多。(圖/文
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中譯英:
Also known as contact conductive drying drying, for wet particles are well adapted to the higher thermal efficiency, and conducting dryer. Evaporation of water vapor or organic solvent by vacuum extraction or with a small amount of air exhaust, air is wet the main carrier, for heat sensitive granular materials by vacuum operation suggestions. In conduction in the drier, paddle dryer for drying of paste materials. Having inner flow tube rotary dryer is designed and has been put into use.

Conduction heat transfer, a jacket, mixing, heat transfer tube heat supply drying material, using heat medium without the hot air. Representative equipment is in a groove shape cylinder dryer. Conical stirring drier, jacket and a built-in heating tube rotary dryer, drum dryer, rake type dryer. In the hot air drying, constant rate drying period temperature corresponds to the wet bulb temperature. In the conduction heat transfer in the drying, to artificially create heating surface, so that the heat transfer area and the heat transfer coefficient increase. In this way, the structure is more complex, equipment investment of large specific heat air dryer.

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