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了解一种传导式干燥机的工作原理

信息来源: | 发布日期: 2012-12-28 16:56:40 | 浏览量:412
要害词:了解一种传导式干燥机的工作原理

了解一种传导干燥机的工作原理

一种干燥机使用了更多的能量比大多数其他散装物料处理设备。一种干燥机,可以节省能源,提高植物的出产力,是一种传导干燥机。一看如何传导与其他干燥方法的第一步是了解烘干机工程,以及它是否适合干燥的需要。一个传导干燥机可以处理热敏感的材料,控制干燥过程中的气氛,以确保^终产物的质量,甚至可以使用余热源,以减少能源成本。

Heyl帕特森提供了一个定制设计的传导干燥解决方案中的MultiDisc的热处理器。

从湿物料蒸发液体,通常需要增加热量。此热量被传递到材料如何取决于干燥方法。这些方法包罗:

传导 - 传输中通过两个表面之间的接触的热和能量 接触加热的气体传输热量公约 - 辐射 - 传送通过表露到热表面的热量 对畅通常被称为直接的传热方法,因为该材料接触的加热介质。传导和辐射通常被称为间接换热的方法,因为这种材料不接触的加热介质。在导通干燥器中的间接热传递适合具体的材料和干燥要求。

一个典型的传导干燥器是一个金属壁,是固定的或旋转的热夹套容器。在某些情况下,干燥器装有搅拌器。冷凝蒸汽,热水,燃烧气体,热油或电加热的外套,它的热量传输到干燥器表面。通过传导,热量传送通过烘缸表面的湿材料。搅拌器或容器的旋转,移动和混合的材料床,消除在床内的湿度梯度和增加的干燥速率。由于材料的干燥,汽化的水分退出容器。

的传导干燥器的表面的温度可以范围从下面的冷冻(冷冻干燥的化学品,精细化学品,药品和食品产物如咖啡)干燥非热敏感材料,如某些粘土和碳酸盐材料需要间接传热。的干燥机通常是适合用于稍微的负压下,在惰性气氛中处理材料。因此干燥器可以防止挥发物的溶剂回收过程中的热空气混合,并可以防止从氧化性,例如有机物和食品产物轻易分解的材料。

因为没有气流接触材料内部的传导干燥机,烘干机比许多对流干燥机提供了更好的粉尘控制。并且不像的对流干燥机,传导干燥器也消耗只有尽可能多的燃料,以维持所需的干燥的温度,这意味着,仅是从材料干燥的干燥器排出的热负荷。在对流干燥器中,热负荷是从材料和热气流,从而降低了干燥器的效率。因为传导干燥机可以使用各种热源,包罗,如蒸汽从锅炉的余热,烘干机可以降低能源成本的持久。

传导干燥机可在不同类型的批处理和持续处理。一个批处理传导干燥机蒸发和干燥的解决方案,浆料,浆料及颗粒。它也可以在真空下操作。的干衣机的燃料需求的范围从1.5-3.0磅的蒸汽每磅水蒸发掉,这取决于材料的所需的^终水分含量。本机的能源成本取决于搅拌或撤离的材料和应用程序的需求。用于充电和放电的材料和后续清理的劳动是干燥器的主要的经营成本。一个批处理机是从尝试室规模的大小,规模化出产。

两种类型的批量传导机可供选择:搅拌锅。

的搅拌干燥机包罗一个程度或垂直的热用桨状或带状搅拌器的夹套容器。桨或色带搅拌的材料,以帮手从血管壁的传热。的干衣机可以处理小的湿材料的几乎任何形式的,如溶液,淤浆,糊剂和颗粒剂的产量。搅拌使干燥器不适合某些可降解材料,如茶叶,糖和其它的附聚的,纤维状或结晶产物。单元工作在常压或加压下稍微的负压。干燥器是易于清洁,和搅拌器的音高可以调整,以减少材料的流动,并增加在烘干机中的材料的滞留时间。

泛机的程度,固定热夹套容器和一台搅拌锅。在某些情况下,被加热油锅。该平移振动或旋转,以帮手将热量从血管壁。的干衣机可以快速干燥大批次的非粘性材料,如自由流动的粉末,颗粒剂,晶体和纤维,并且可以回收溶剂。的干衣机的搅拌创建一个研磨作用,可以降低一些材料,所以干燥器可以要求一个尘埃收集器。本机也可以在真空条件下工作。删除冲刷液清洗后的锅,可以耗费时间。

Heyl和帕特森设计和制造机,可提供多年的无故障运行,并提供尝试室测试设施。因为我们自定义工程师每个MultiDisc的热处理器和保持原始图纸,我们可以按照本来的规格,烘干机办事。我们负责送货上门,安装和启动您的设备,您的工作人员,并提供初步的操作说明。

我们也制造商直接提供,以满足原始设备规格,以确保任何升级或维修将达到或超过原有设备的性能程度。 Heyl帕特森提供卓越的客户撑持之前,期间和之后,我们提供的每一个产物的采办。

Understanding How a Conduction Dryer Works

A dryer uses much more energy than most other bulk material processing equipment.  One dryer that can save energy and enhance a plant's productivity is a conduction dryer.  A look at how conduction compares with other drying methods is the first step in understanding how such a dryer works and whether it's right for your drying needs.  A conduction dryer can handle heat-sensitive materials, control a drying process atmosphere to ensure final product quality, or even use a waste heat source to cut energy costs.

Heyl & Patterson offers a custom-engineered conduction drying solution in the MultiDisc Thermal Processor.

Driving off the liquid from wet material typically requires adding heat.  How this heat is transferred to the material depends on the drying method.  These methods include:

Conduction - Transferring heat and energy by contact between two surfaces Convention - Transferring heat by contact with a heated gas Radiation - Transferring heat by exposure to a hot surface Convection is often called a direct heat transfer method because the material contacts the heating media.  Conduction and radiation are typically called indirect heat transfer methods because the material doesn't contact the heating media.  The indirect heat transfer in a conduction dryer suits specific materials and drying requirements.

A typical conduction dryer is a metal-walled, heat-jacketed vessel that is stationary or rotating.  In some cases, the dryer is equipped with an agitator.  Condensed steam, hot water, combustion gas, hot oil or electricity heats up the jacket, which transfers the heat to the dryer surface.  By conduction, the heat transfers through the dryer surface to the wet material.  The agitator or the vessel's rotation moves and mixes the material bed, eliminating moisture gradients within the bed and increasing the drying rate.  As the material dries, the vaporized moisture exits the vessel.

The temperature of the conduction dryer's surface can range from below freezing (for freeze-drying chemicals, fine chemicals, pharmaceuticals and food products such as coffee) for drying non-heat sensitive materials such as some clays and carbonate materials that require indirect heat transfer.  The dryer is typically suitable for handling materials under slight negative pressure and in an inert atmosphere.  Thus the dryer can prevent volatiles from mixing with hot air during solvent recovery and can prevent easily decomposed materials from oxidizing, such as organics and food products.

Because no airflow contacts the material inside the conduction dryer, the dryer provides better dust control than many convection dryers.  And unlike a convection dryer, the conduction dryer also consumes only as much fuel as needed to maintain the temperature required for drying, which means that the heat load exiting the dryer is only from the material it dries.  In a convection dryer, the heat load is from both the material and hot airflow, which reduces the dryer's efficiency.  And because the conduction dryer can use various heat sources, including waste heat such as steam from a boiler, the dryer can cut energy costs over the long term.

Conduction dryers are available in various types for both batch and continuous processing.  A batch conduction dryer can evaporate and dry solutions, slurries, pastes and granules.  It can also operate under vacuum.  The dryer's fuel requirements range from 1.5-3.0 pounds of steam per pound of water evaporated, depending on the material's required final moisture content.  The dryer's energy costs depend on the material and the application's requirements for agitation or evacuation.  The labor for charging and discharging the material and subsequent cleanup is the dryer's major operating cost.  A batch dryer is available in sizes from lab-scale to full-scale production.

Two types of batch conduction dryers are available:  agitating and pan.

An agitating dryer consists of a horizontal or vertical heat-jacketed vessel with a paddle or ribbon agitator.  The paddle or ribbon agitates the material to aid heat transfer from the vessel wall.  The dryer can handle small production volumes of nearly any form of wet material, such as solutions, slurries, pastes and granules.  The agitation makes the dryer unsuitable for some degradable materials such as tea leaves, sugar and other agglomerated, fibrous or crystalline products.  The unit operates at atmospheric pressure or under slight negative pressure.  The dryer is easy to clean, and the agitator's pitch can be adjusted to reduce material flow and increase the material's retention time in the dryer.

A pan dryer has a horizontal, stationary heat-jacketed vessel and a flat agitating pan.  In some cases, the pan is heated.  The pan vibrates or rotates to help transfer heat from the vessel wall.  The dryer can quickly dry large batches of nonsticky materials such as free-flowing powders, granules, crystals and fibers, and can recover solvents.  The dryer's agitation creates a grinding action that can degrade some materials, so the dryer can require a dust collector.  The dryer can also operate under vacuum.  Removing a washdown solution from the pan after cleaning can be time-consuming.

Heyl & Patterson designs and builds dryers to provide years of trouble-free operation, and offers facilities for laboratory testing.  Because we custom engineer each MultiDisc Thermal Processor and maintain the original drawings, we can service your dryer according to its original specifications.  We oversee delivery, installation and start-up of your equipment, and provide preliminary operating instructions to your personnel.

We also provide manufacturer-direct parts that meet original equipment specifications, ensuring that any upgrades or repairs will meet or exceed the original equipment's performance levels.  Heyl & Patterson provides superior customer support before, during and after the purchase of every product we supply.

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