标签档案:流化床制粒机

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流化床烘干机

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流化床干燥机(又称流化床干燥机)是制药工业中广泛使用的一种降低药粉、颗粒含水率的设备。该设备的工作原理是原料流化。

在流态化过程中,热空气在高压下通过湿固体颗粒的多孔床层引入。湿固体从底部被提起,悬浮在空气流中(流态化)。热传递是通过湿固体和热气体之间的直接接触来实现的。蒸发的液体被干燥的气体带走。有时为了节约能源,出口的气体会被部分回收。

一个典型的流化床干燥器由以下组件组成

a.空气准备单元。

b。产品容器。

C。排气过滤器。

d。排风机。

e。控制面板。

F。空气分配板。

G。喷嘴。H。解决方案交付。期间使用的分配器的选择和干燥过程除了确保均匀和稳定的流化还防止在某些区域的固体的1普尔流化质量在流化床干燥器。2.堵塞分配器的-perforated孔。3.从落入风箱或位于流化床下方气体室的固体。在整个经销商的压降必须足够高,以保证良好的和均匀的流动。目录[显示]参数到在流化床干燥器(系统)为了改进操作,效率,和流化床干燥器的再现控制,一些参数需要被控制。这些参数被分为:设备参数:那些由设备控制。 Process parameters: Those controlled by the process. Product parameters: Those controlled by the product. 1. Apparatus/Equipment Parameter Position of the air distribution plate: This parameter influences the pattern. Shape of the instrument: The annular based design gives a better product. Nozzle height: Nozzle height plays a vital role when fluidized bed dryers are used as a coating machine. The atomized coating solution should not get dried before reaching the tablet surface. 2. Process/Operating Parameter Temperature: Increased temperature leads to increased moisture diffusivity and hence increased drying rate and decreased drying time. The nature of the material plays an important role in choosing the operating temperature. Humidity: Faster drying is achieved when the moisture content of the inlet air is maintained at its minimum. Airflow rate/gas velocity: Increasing gas velocity increases drying rate but should be maintained at an optimized rate (not to fast or too slow). Gas velocity has no effect on particles with high internal resistance to moisture transfer. 3. Product Parameters Moisture content of the feed material. Feed rate/batch size. Product moisture content. Particle size, shape, and diameter. Read Also: Rotary Dryer Types of Fluidized-Bed Dryers There are various types of fluidized bed dryer and an individual’s familiarity with the specific characteristics of these various types enables one to make a logical and cost-effective selection of fluidized bed dryer for a drying operation. In many instances, several different types may provide similar performance at the same cost. It should be noted also that not all modified fluidized bed dryers are necessarily better than the conventional dryers in terms of product quality, or energy efficiency, or drug performance. picture of conventional fluid bed dryers 1. Conventional Fluidized Bed Dryers Conventional fluidized bed dryers include; Batch fluidized bed dryers. Semi-continuous fluidized bed dryers. Well-mixed, continuous fluidized dryers. Plug flow fluidized bed dryer. 2. Modified Fluidized Bed Dryers Various types of modified fluidized bed dryers have been developed and are applied in many industrial processes to overcome some of the problems encountered while using conventional fluidized bed dryers for a drying process. They include but not limited to; Hybrid fluidized bed dryers Pulsating fluidized bed dryers Fluidized bed dryer with immersed heat exchange. Mechanically assisted fluidized bed dryer. Vibrated fluidized bed dryer. Agitated fluidized bed dryer/swirl fluidizers. Fluidized bed dryers of inert particles. Spouted bed dryer. Recirculating fluidized bed dryer. Jetting fluidized bed dryer. Superheated steam fluidized bed dryer. Fluidized bed freeze dryer. Heat pump fluidized dryers. It should be noted that not all modified fluidized bed dryers are necessarily better than the conventional dryers in terms of product quality, or energy efficiency, or drying performance. Advantages of Fluidized-bed Dryers 1. High rates of moisture removal due to excellent gas-particle constant which results in high heat and mass transfer rates. 2. High thermal efficiency is usually achieved if part of the thermal energy for drying is supplied by the internal heat exchanger 3. Lower capital and maintenance cost 4. Reduced contact time for drying. 5. Ease of control. Disadvantages of Fluidized Dryers 1. High pressure drops results as a result of the need to suspend the entire bed in gas which equally leads to high energy consumption. 2. Requires increased gas handling due to extensive recirculation of exhaust gas for high thermal efficiency operation. 3. Poor fluidization and low flexibility especially if the feed is too wet. 4. Not the best choice of equipment when organic solvents need to be removed during drying. 5. Non-uniform product quality for certain types of fluidized bed dryers. 6. Entertainment of fine particles. 7. High potential for attrition; and in some cases agglomeration of fine particles. 8. The conventional hot air fluidized bed dryers are not a good choice of dryer when handling toxic or flammable solids since there is danger of fire or explosion of flammability limits are exceeded.

参考Arun S. Mujumdar(2015)。工业干燥手册。CRC出版社,泰勒和弗朗西斯集团,纽约。

标签:烘干机,流化床烘干机,FBD烘干机


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如何提高色带搅拌机的效率?

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如何提高色带搅拌机的效率?

在整个过程中,各种粉末混合物都是在普遍存在的主管中产生的丝带搅拌机。从调味料和饮料混合给制药,化学,塑料和农业粉末,固体固体混合的可靠方法是生产的核心,带状搅拌器是由于其效率和经济而受欢迎的选择。

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搅拌机带
带式搅拌器由u形水平槽和由内外螺旋带组成的搅拌器组成,螺旋带可以轴向、反向或径向移动物料。搅拌器尖端速度在300英尺/分钟范围内是典型的。

为特定应用选择合适的色带搅拌器以批量密度开始。批量密度确定是否需要标准或重型搅拌器,并且给定目标批量尺寸(重量),堆积密度定义了理想的搅拌器模型(容量通常在体积中列出)。提供可选的功能,如加热/冷却夹克,真空能力,可互换的桨叶,块破碎机,卫生饰面,甚至由特殊合金构成的湿润零件等可选功能。最近,新功能已经可用,旨在最大限度地提高效率,融合一致性和生产力。询问您的搅拌器制造商有关以下选项:
如何制作丝带搅拌机
•刮刀焊接到辐条和缎带。刮板有一个紧密的公差(大约1/8英寸)到端壁显著减少了材料的数量,可能倾向于包装在搅拌机的最外面的区域。“辐射”槽角进一步消除了产品区域的任何死角。

•清晰的视图盖和轴卫罩。图案化带搅拌器具有FDA批准的聚碳酸织物轴防护装置和盖子的段。多件式盖板配有多个端口,用于成分添加,灯,喷雾系统,通风和真空,显着提高了使用和工人安全性。运营商可以安全地监控搅拌器的内容并在搅拌器运行时充电原料。无需停止搅拌并以多个间隔打开盖子,因此优化循环时间,并且防止了不必要的粉尘问题。

•空气净化机械轴封。特殊的密封安排,如空气净化机械轴密封,消除了产品泄漏的风险,防止过早轴承或驱动失效和轴磨损。空气净化在密封腔内产生更高的压力,形成空气屏障,有助于将材料留在槽内,并增加密封可穿戴部件的寿命。

•气动供电的球形盘阀。这种款式阀门提供大开口并最大限度地减少死区。可以使用下游材料处理系统完美地定制放电连接。

•定制PLC食谱控制。将PLC配方控制应用到混合过程中有多个好处:批到批的一致性,自动数据记录,减少操作员错误,更快的转换,更长的使用寿命,等等。配方可以被写入并存储到内存中,因此从一种配方转换到另一种配方只需要几秒钟,最大限度地延长了生产时间。预先编程的维护屏幕可以帮助设备避免由于可预防的维护问题而停机,提醒技术人员在一定的运行时间后检查润滑脂、密封件、轴承和其他部件。在定制的控制方案中,硬件也可以与现有系统联网,这些系统在整个过程中可能需要与其他设备进行一定程度的握手。SCADA系统、软件程序、特殊协议和网络问题都应该在项目早期解决,以确保完全的兼容性。
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