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传导传热干燥设备有哪些应用
传导干燥也称接触干燥,对于潮湿颗粒非常适应,而传导干燥机热效率较高。蒸发的水蒸汽或有机溶剂由真空抽出或用少量气流排出,耙…

传导干燥也称接触干燥,对于潮湿颗粒非常适应,而传导干燥机热效率较高。蒸发的水蒸汽或有机溶剂由真空抽出或用少量气流排出,耙式干燥机气流是湿分的主要载体,对于热敏性颗粒状物料建议用真空操作。在传导干燥机中,桨叶干燥机用于干燥膏状物料。具有内流管的旋转式干燥机现已设计出来并已投入使用。
传导传热中,由夹套、搅拌、传热管等将热量供给干燥物料,用热媒而不用热空气。代表性的设备是槽型的圆筒干燥机。圆锥搅拌干燥机、夹套和内置加热管回转干燥机、鼓式干燥机、耙式干燥机、真空带式干燥机、真空冷冻干燥机等。在热空气干燥中,恒速干燥时期的温度相当于湿球温度。而在传导传热干燥中,需要人为地创造加热面,使传热面积小而传热系数增加。这样,结构就比较复杂,设备投资比热空气干燥机大。
传导干燥法通过金属等蜀面间接传递干燥所需要的热量。干燥速率比直接干燥法低。恒速干燥期间产品温度与加热源的温度没有关系,大体与装置内气体压力的饱和温度相同。为了提高干燥速率和防止干燥不均,通常用机械搅拌或使容器本身旋转,以增加或不断更新物料的传热面,因此有必要深入研究传热机构的附着问题。干燥装置本身价格昂贵,但其特点是集尘系统的负荷小,热效率高,溶剂容易回收,总的费用比直接干燥法便宜得多。(图/文
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中译英:
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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