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德国BUSS立式薄膜干燥器先容(BUSS-SMS-Canzler)

信息来源: | 发布日期: 2012-12-18 10:38:29 | 浏览量:398504

摘要:

译文:立式薄膜干燥器的工作原理

薄膜干燥器,其特征在于由一个机械搅拌干燥机内的薄的产品层。 立式薄膜干燥器包括带加热夹套并配备行所有的长度上的干衣机摆锤叶片的壳,其内部的转子的圆筒状的,竖直的主体。的铰接叶片蔓延的湿饲料产品在薄膜在加热的壁。该层的厚度被定义由叶片和壁之间的间隙。一个高度搅拌的弓形波形成在前面的转子叶片。随着产品通过之前的间隙进入一个平静的区域位于刀片背后的动荡。连续的挥发性组分蒸发。产物层通常是小于一毫米为单位的厚度。铰链摆片的目的是给烘干机的^小间隙与墙,防止产品的受热面的积灰,但本身不接触加热壁。   通常情况下,在一个立式的薄膜干燥器的干燥过程包括预热,浆料和粉末区。 在预热区的产品达到沸点。蒸发开始形成固体。 以浆料区段,固体的浓度增加。在此阶段中的许多产品往往被压在钟摆叶片以形成附聚物。 在^终的粉末区表面的水分被进一步除去,并在干燥过程完成。 对于一个给定的进料速率和进料水分含量的产品,在很大程度上取决于各个区域的长度。随着进给速率的预热和浆料区增加,由于增加的热量需求。其结果的粉末区减小的尺寸和^终的水分含量可能增加。 蒸气移动通过干燥器逆流产品流和一个外部的冷凝器中冷凝。 自由流动的粉末通过一个合适的空气锁系统离开干燥器。 大家的生产计划包括立式薄膜干燥器至60平方米的受热面。干燥器与蒸汽,温水,热油或电加热。

原文:Operating Principle of vertical thin film dryers

Thin Film Dryers are characterised by a mechanically agitated thin product layer inside the dryer. The Vertical Thin Film Dryer consists of a cylindrical,vertical body with heating jacket and a rotor inside of the shell which is equipped with rows of pendulum blades all over the length of the dryer. The hinged blades spread the wet feed product in a thin film over the heated wall. The thickness of the layer is defined by the clearance between the blade and the wall. A highly agitated bow wave is formed in front of the rotor blades. The turbulence increases as the product passes through the clearance before entering a calming zone situated behind the blades. The volatile component evaporates continuously. The product layer is typically less than a millimetre in thickness. The hinged pendulum blades are designed to give a minimum clearance with the dryer wall to prevent fouling of the heating surface by product, but do not themselves contact the heated wall.   Normally, the drying process in a Vertical Thin Film Dryer consists of a preheating, a slurry and a powder zone. In the preheating zone the product reaches boiling point. Evaporation starts and solids are formed. In the slurry zone, the concentration of solids increases. Many products during this phase tend to form agglomerates which are crushed by the pendulum blades. In the final powder zone surface moisture is further removed and the drying process is completed. The length of the various zones depends for a given product largely on the feed rates and feed moisture content. With increasing feed rate the preheating and the slurry zone increase due to the increased heat demand. As a result the powder zone decreases in size and the final moisture content may increase. The vapour moves through the dryer counter-current to the product flow and is condensed in an external condenser. The free flowing powder leaves the dryer via a suitable air lock system. Our manufacturing program includes Vertical Thin Film Dryers with heating surfaces up to 60 m². The dryers are heated with steam, warm water, thermal oil or electrically.

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