标签档案:流体床造粒机

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流化床烘干机

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流化床烘干机(也称为流化床烘干机)是一种在制药行业广泛使用的设备,以减少药物粉末和颗粒的水分含量。该设备采用饲料材料流化的原则。

在流化工艺中,热空气通过多孔的湿固体颗粒的穿孔床引入高压。湿固体从底部抬起并悬浮在空气流(流化状态)中。通过在湿固体和热气体之间直接接触来实现传热。蒸发的液体通过干燥气体传离。有时可以节省能量,退出气体部分回收。

典型的流化床干燥机包括以下组件

一种。空气磨削单位。

湾产品容器。

C。排气过滤器。

天。排气鼓风机。

e。控制面板。

F。空气分配板。

G。喷嘴。H。解决方案提供。除了确保均匀且稳定的流化过程中,使用期间和干燥过程的选择也可防止1.流化床干燥器中的某些区域中固体的流化质量差。2.插入分配器的孔。3.掉入风箱或位于流化床下方的气孔的固体。分配器中的压降必须足够高,以确保良好和均匀的流化。目录[显示]在流化床干燥器中控制参数(系统),以提高流化床烘干机的运行,效率和再现性,需要控制一些参数。这些参数被分类为:设备参数:由设备控制的那些。 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新闻,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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如何提高丝带搅拌机效率?

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如何提高丝带搅拌机效率?

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。

丝带搅拌机制造商

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搅拌器丝带
丝带搅拌器由U形水平槽和由内螺旋带组成的搅拌器组成,所述内螺旋带由俯仰以轴向地移动材料,并且还径向地。300英尺/分钟范围内的搅拌器尖端速度是典型的。

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
•刮板焊接到辐条和丝带。刮板具有近距离的耐受性(大约1/8英寸)到底墙显着减少了可能倾向于在搅拌机的最外层区域中包装的材料量。'Radiused'槽角进一步消除产品区中的任何死区。

•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。

•空气吹扫机械轴密封件。特别密封装置,如空气吹扫机械轴密封件,消除了产品泄漏的风险,防止过早轴承或驱动故障和轴磨损。空气吹扫在密封腔内产生更高的压力,产生一个空气屏障,有助于保持槽内的材料,并增加密封件可穿戴部件的寿命。

•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。

•自定义PLC配方控制。将PLC配方控制应用于混合过程有多种好处:批量到批量一致性,自动化数据记录,减少操作员错误,更快的转换,以及更长的使用寿命,只是为了命名几个。食谱可以写入并存储到内存中,从而将批处理协议从一个配方切换到另一个配方只需要几秒钟,最大化生产时间。预先编程的维护屏幕可以通过可预防的维护问题,提醒技术人员在一定数量的运行时间后,提醒技术人员从停机时间免于停机。在自定义控制方案中,硬件也可以网络连接到现有系统,该系统可能需要在整个过程中与其他设备的握手。SCADA系统,软件程序,特殊协议和网络问题应如何早期处理到项目中以确保完全兼容性。
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