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Drying: Classification of Solids and Dryers for Different Purposes

This article discusses the purposes of drying and the classification of solids based on drying behavior. It also covers various types of dryers used, including static-bed dryers, moving-bed dryers, fluidized-bed dryers, pneumatic dryers, and specialized drying methods like freeze drying and microwave drying.

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Drying: Classification of Solids and Dryers for Different Purposes

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  1. DRYING Lab -5-

  2. Drying

  3. Purposes of drying:

  4. Classification of solids on drying behavior Note:Amorphous solids are difficult to dry than granular or crystalline solids.

  5. Classification of dryers

  6. 1- Static-bed dryers- systems • A- tray and truck dryers: it consist from cabinet in which the material dried is spread on tiers of trays .

  7. 1- Static-bed dryers- systems • B- tunnel and conveyor dryer:an adaptation of truck dryer for continuous drying.

  8. 1- Static-bed dryers- systems • C- oven: including autoclave and dry oven

  9. 2- moving-bed dryers-systems • The drying particles are partially separated so that they flow over each other. • A. turbo-tray dryer • B. pan dryer

  10. 3- fluidized - bed dryers systems • Solid particles are partially suspended in upward moving gas steam.

  11. 4- pneumatic dryers system • Drying particles are entrained and conveyed in a high velocity gas stream.

  12. 5- specialized drying methods • A- Freeze dryer

  13. 5- specialized drying methods • B- Microwave drying:- here instead of applying heat externally to material, energy in form of microwaves is converted into internal heat by interaction with material itself

  14. Solids drying

  15. Example If exactly 7 g of moist solid is brought to a constant dry weight of 5 g: • MC = x 100 = 40% Whereas • LOD = x 100 = 28.57%

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