fluidized bed drayer ppt

fluidized bed drayer ppt

• 1.
  Presentation on Presented by: Deepak Thakur B.PharmIIISem Y17150114 Submitted to: Mr. Vikash pandeySir Research scholar, DOPS Dr. Hari Singh Gour Vishwavidyalaya, Sagar (MP) (A Central University)
• 2.
  INTRODUCTION PRINCIPLE CLASSIFICATION OF FLUIDIZEDBED DRAYER CONSTRUCTION WORKING PARAMETER THAT CAN BE CONTROLLED ADVANTAGES DISADVANTAGES PHARMACEUTICAL APPLICATIONS
• 3.
  INTRODUCTION Fluidized bed drayer Fluidbed drying is most widely used technique for drying. and in pharmaceutical field mainly for powders and granules. The direct contact between particles and air/gas is possible in fluid bed system.  Here any type of inert gas or air is used.  They can be designed in either batch or continuous type fluid bed dryer
• 4.
   The equipmentworks on a principle of fluidization.  In fluidization process, hot air is introduced at high pressure through a perforated bed of moist solid particulate.  The wet solids are lifted from the bottom and suspended in a stream of air (fluidized state).  To attain this state the requirement is that the velocity of the air/gas should be grater than the velocity of settling particles.  Heat transfer is accomplished by direct contact between the wet solid and hot gases.
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   The vaporizedliquid is carried away by the drying gasses..  The hot gas surrounding every granule to completely dry them.  Thus, material or granules are uniformly dried.
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  The dryer ismade of stainless steel or plastic. A detachable bowl is placed at the bottom of the dryer, which is used for charging and discharging. The bowl has a perforated bottom with a wire mesh support for placing materials to be dried.
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  A fan ismounted in the upper part for circulating hot air. Fresh air inlet, prefilter and heat exchanger are connected serially to heat the air to the required temperatures. The temperature of hot air and exit are monitored. Bag filters are placed above the drying bowl for recovery of fines.
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   The mainprinciple involved in fluidized bed dryer is “Fluidization”.  In this state the granules are completely suspended in a stream of hot air which is being supplied from the bottom of the container.
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   Fluidization producesfull agitation of solid particles and since each particle gets surrounded by hot air, heat transfer is extremely high and uniform.  The product is dried fast without appreciable loss of heat. Filter bags prevent particles escaping from the dryer.  The material is left for some time in the dryer for reaching ambient temperature.  The end product is free flowing.
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  In order toimprove operation, efficiency, and reproducibility of a fluidized bed dryer, some parameters need to be controlled. Temperature Humidity Moisture content of the feed material. Feed rate/batch size. Product moisture content. Particle size and diameter.
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   Fluidized beddryer requires less time to complete drying. i.e., 20 to 40 min. Hot spots are not observed in the dryer, because of its excellent mixing and drying capacities. The thermal efficiency is 2 to 6 times greater than tray dryer.  It facilitates the drying of thermolabile substances , since the contact time for drying is short. Handling is Easy and Less Labor Intensive
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  Many organic powdersdevelop electrostatic charges during drying which can be avoided by efficient electrical earthing of the dryer. The turbulence of the fluidized state of granules may cause attrition of some materials resulting in production of fines which can be avoided by using suitable binding agent. high energy consumption.  Requires gas handling  Poor fluidization and low flexibility especially if the feed is too wet. Drying Sticky Material is Quite Difficult
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   It isused for the popularly drying of the granules in the production of the tablets.  It is used for the three operation such as mixing, granulation and drying.  It is modified for coating of granules.