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闪蒸干燥机 基尔M / S奈良机械公司,日本,闪蒸干燥器在世界上的^制造商的技术合作,生产闪蒸干燥器。这种设计使用悬浮颗粒表面的材料中的水分迅速除去的固体颗粒分散在加热的气体/空气流的干燥技术。操作原理这个词闪蒸是指瞬时或快速干燥的产品。有五种主要因素支配的干燥速度。这些是:1。水分分布 这被定义为潮湿的表面的干燥介质(热空气或气体)中的可访问性。这是通过使用分散机如机械散射体,双桨馈线或笼式磨机等,通过混合在饲料中的干燥产物的产物在闪蒸干燥器实现。2。温度差 在闪蒸干燥,它是可能的,使用高的初始温度。这些都可能是由于接触时间短的结果,产品的温度从未超过气体的湿球温度,除非所有的表面水分除去。3。 AGITATION 在闪蒸干燥机,搅拌或湍流是通过使用高气体速度。蒸汽膜不断卷走从潮湿的颗粒。其结果是,除去水分几乎是瞬时的。4。颗粒结构 具有毛细管的材料将能够更迅速地得到的迅速干燥作用中的内部区域的表面自进化水分。有没有空隙的致密颗粒,是很难干燥,在一个闪蒸干燥系统。5。颗粒尺寸 通过蒸发从粒子的表面来完成干燥。因此,要除去的内部的水分,这是必要的水分通过扩散到达表面。这一转移将明显发生^迅速,更小的颗粒。典型布置 若干安排是可能的单独的应用程序,以适应规范。少数的安排都在这里显示。可以改变的需要和应用基础的基本组成部分。应用 闪蒸干燥可以考虑在几乎任何应用程序可以被转换成一个干粉滤饼,离心机蛋糕,污泥或潮湿的固体。 这种技术可以经济地使用几乎任何材料范围从热敏感的药品,如青霉素,磺胺类药物,可可蛋糕等食品原料,淀粉,纤维素,PVC,金属硬脂酸盐,矿物质,如碳酸钙陶瓷,粘土,和许多其他的化学物质,如材料。 此技术是^经济的,如果只以除去表面水分。FLASH DRYERS KILBURN manufactures Flash Dryers in technical Collaboration with M/S NARA MACHINERY COMPANY, JAPAN, the leading manufacturer of Flash Dryers in the world.This design uses suspended particle drying techniques where surface moisture of the material is rapidly removed by dispersing the particulate solids in a heated stream of gas / air.PRINCIPLE OF OPERATIONThe very word FLASH means instantaneous or rapid drying of products.There are five primary factors which govern the speed of drying. These are :1. MOISTURE DISPERSION This is defined as the accessibility of the moist surface to the drying medium (Hot air or gas). This is achieved in a flash dryer by use of a product disperser such as mechanical scatterer, double paddle feeder or cage mill etc. by mixing dried product in the feed.2. TEMPERATURE DIFFERENTIAL In flash drying it is possible to use high initial temperatures. These are possible due to short contact time with the result that the product temperature never exceeds the wet bulb temperature of the gas unless all surface moisture is removed.3. AGITATION In Flash Dryer, agitation or turbulence is accomplished by the use of high gas velocities. The vapour film is continuously swept away from moist particles. As a result, moisture removal is practically instantaneous.4. PARTICLE STRUCTURE Materials having capillaries will be able to evolve moisture to the surface from internal areas more rapidly resulting in swift drying action. Dense particles which have no voids are difficult to dry in a flash drying system.5. PARTICLE SIZE Drying is accomplished by evaporation from the surface of the particle. Therefore to remove the internal moisture, it is necessary that the moisture reaches the surface by diffusion. This transfer will obviously take place most rapidly with smaller particles.TYPICAL ARRANGEMENTS Several arrangements are possible for individual application to suit specification. A few arrangements are shown here. The basic components can be changed on need & application basis.APPLICATIONS Flash drying can be considered in almost any application where a Filter Cake, Centrifuge Cake, Sludge or Damp solids can be converted to a dry powder. This technique can be economically utilized on practically any material ranging from heat sensitive Pharmaceuticals like sulfa drugs, Penicillin, Food Materials like Cocoa Cake, Starch, Chemicals like Cellulose, PVC, Metallic Stearates, Minerals and Ceramics like Calcium Carbonates, Clay, and many other materials . This technique is most economical if only surface moisture is to be removed.国内制造双锥回转真空干燥机的厂商很多,但总体设计和制造水平相对较低,对这一经典实用设备没有实质性的提高,更谈不上对此类产品的优化组合。然而,造成双锥回转真空干燥机发展缓慢的真正原因是没能结合理论去研究双锥回转真空干燥机的性能与应用。笔者以真空干燥理论为依据,对国内双锥回转真空干燥机的提高作必要的思考一般情况下,农药干燥机主要由进气过滤系统(初效、中效、空气过滤器)、蒸汽加热器、主机(物料室、扩展室)、引风机、除尘器、电控系统、操作台等组成,由于物料与干燥介质的接触面积大,物料在床内搅拌剧烈,传热效果好,热容量系数大。此外,由于农药干燥机流化床内温度分布均匀,可有效避免产品局部过热。因此,它也更对于有烘干需求的客户来说,污泥干化设备的选择是非常困难而又复杂的问题。因被干燥物料的特性,供热的方法和物料干燥介质系统的流体动力学等必须全部考虑。由于被干燥物料种类繁多,要求各异,决定了不可能有一个万能的干燥器,只能选用合适的干燥方法和干燥器形式。 1、选择干燥器要考虑的因素在选择干燥器形式时旋转闪蒸干燥机是气流干燥机与流化床相结合的新式干燥机物料和气流在旋转状态下闪电般的蒸发水分1-10秒内就可以完结整个干燥进程。对浆糊状、膏糊状、滤饼状的物料有无黏性均可干燥。XSG系列旋转闪蒸干燥机引入、吸收国外先进技能的基础上,自行开发成功的新式干燥设备,该机技能先进,设计合理,构造紧凑,适用范围 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 |
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