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DRYERS and DRYING PROCESS<br />
Drying<br /> An operation in which a liquid, usually water, is removed from a wet solid in equipment termed a dryer.<br />
Dryers<br />Spray dryer<br />Oven dryer<br />Freeze dryer<br />Vacuum dryer<br />Rotary dryer<br />Drum dryer<br />
I. Spray dryer<br />a device used in spray drying<br />can dry a product very quickly compared to other methods of drying<...
Spray dryer<br />
Spray drying<br />a method of producing a dry powder from a liquid or slurry by rapidly drying with a hot gas<br />use som...
Spray drying process<br />ATOMIZATION<br />HEATED GAS STREAM<br />SEPARATION<br />
A=Solution or suspension to be dried in<br />B=Atomization gas in<br />1= Drying gas in,<br />2=Heating of drying gas<br /...
Applications (Spray drying)<br />Food: milk powder, coffee, tea, eggs, cereal, spices, flavorings<br />Pharmaceutical: ant...
II. Oven dryer/ kiln<br />A kiln is a thermally insulated chamber, or oven, in which a controlled temperature regime is pr...
Oven drying<br />A drying oven is a device for applying low heat over a long time to a variety of objects for a variety of...
Oven drying process<br />
Applications (Oven drying)<br />toilet bowls, sewer pipe, tiles, and glassand porcelain. <br />manufacture of chlorine gas...
III. Freeze dryer<br />A device used for freeze drying<br />The result is a product that can be stored at room temperature...
Freeze drying<br />also known as lyophilisation<br />is a dehydrationprocess typically used to preservea perishable materi...
Freeze drying process<br />Cooling <br />Vacuum chamber<br />sublimation<br />
Applications (Freeze drying)<br />Pharmaceutical companies often use freeze-drying to increase the shelf life of products<...
IV. Vacuum dryer<br />can be used for delicate materials and save up significant energy quantities due to lower drying tem...
Vacuum drying<br />Vacuum drying is a process in which materials are dried in a reduced pressure environment, which lowers...
Vacuum drying process<br />
Applications ( Vacuum drying)<br />commonly used for drying thick hard wood and other materials<br />
V. Rotary dryer<br />A rotary dryer is a device that uses rotation, gravity and warm gasses to dry a material<br />
Rotary drying<br />A direct heated dryer uses the combustion gases generated by the heater mixed with an artificially heat...
Rotary drying process<br />
Applications (Rotary drying)<br />A rotary dryer is a device that uses rotation, gravity and warm gasses to dry a material...
VI. Drum dryer<br />adrum dryer is a rotating cylinder that uses steam or hot air to heat feedstockand reduce the moisture...
Drum drying<br />Depending upon the products it will be processing, a drum dryer is typically made from cast iron or stain...
Drum drying process<br />
Application (Drum drying)<br />Powdered milk, starches, breakfast cereals, baby food, instant mashed potatoes<br />
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Dryers

  1. 1. DRYERS and DRYING PROCESS<br />
  2. 2. Drying<br /> An operation in which a liquid, usually water, is removed from a wet solid in equipment termed a dryer.<br />
  3. 3. Dryers<br />Spray dryer<br />Oven dryer<br />Freeze dryer<br />Vacuum dryer<br />Rotary dryer<br />Drum dryer<br />
  4. 4. I. Spray dryer<br />a device used in spray drying<br />can dry a product very quickly compared to other methods of drying<br />
  5. 5. Spray dryer<br />
  6. 6. Spray drying<br />a method of producing a dry powder from a liquid or slurry by rapidly drying with a hot gas<br />use some type of atomizer or spray nozzle to disperse the liquid or slurry into a controlled drop size spray<br />
  7. 7. Spray drying process<br />ATOMIZATION<br />HEATED GAS STREAM<br />SEPARATION<br />
  8. 8. A=Solution or suspension to be dried in<br />B=Atomization gas in<br />1= Drying gas in,<br />2=Heating of drying gas<br />3=Spraying of solution or suspension<br />4=Drying chamber<br />5=Part between drying chamber and cyclone<br />6=Cyclone<br />7=Drying gas is taken away<br />8=Collection vessel of product, arrows mean that this is co-current lab-spray dryer<br />
  9. 9. Applications (Spray drying)<br />Food: milk powder, coffee, tea, eggs, cereal, spices, flavorings<br />Pharmaceutical: antibiotics, medical ingredients, additives<br />Industrial: paint pigments, ceramic materials, catalyst supports<br />
  10. 10. II. Oven dryer/ kiln<br />A kiln is a thermally insulated chamber, or oven, in which a controlled temperature regime is produced<br />
  11. 11. Oven drying<br />A drying oven is a device for applying low heat over a long time to a variety of objects for a variety of purposes<br />
  12. 12. Oven drying process<br />
  13. 13. Applications (Oven drying)<br />toilet bowls, sewer pipe, tiles, and glassand porcelain. <br />manufacture of chlorine gas<br />curing of rubber and plastics <br />
  14. 14. III. Freeze dryer<br />A device used for freeze drying<br />The result is a product that can be stored at room temperature for years without spoilage, or packed in limited storage spaces and reconstituted with water later<br />
  15. 15. Freeze drying<br />also known as lyophilisation<br />is a dehydrationprocess typically used to preservea perishable material or make the material more convenient for transport.<br />
  16. 16. Freeze drying process<br />Cooling <br />Vacuum chamber<br />sublimation<br />
  17. 17. Applications (Freeze drying)<br />Pharmaceutical companies often use freeze-drying to increase the shelf life of products<br />Food: instant coffee, astronaut food, freeze- dried fruits, cereals<br />Technological industry: freeze-drying is often reserved for materials that are heat-sensitive, such as proteins, enzymes, microorganisms, and blood plasma<br />
  18. 18. IV. Vacuum dryer<br />can be used for delicate materials and save up significant energy quantities due to lower drying temperatures<br />
  19. 19. Vacuum drying<br />Vacuum drying is a process in which materials are dried in a reduced pressure environment, which lowers the heat needed for rapid drying. It does not take place in a true vacuum, despite the name<br />
  20. 20. Vacuum drying process<br />
  21. 21. Applications ( Vacuum drying)<br />commonly used for drying thick hard wood and other materials<br />
  22. 22. V. Rotary dryer<br />A rotary dryer is a device that uses rotation, gravity and warm gasses to dry a material<br />
  23. 23. Rotary drying<br />A direct heated dryer uses the combustion gases generated by the heater mixed with an artificially heated gas. This second gas is nearly always common air, but it can be any inert gas. <br />
  24. 24. Rotary drying process<br />
  25. 25. Applications (Rotary drying)<br />A rotary dryer is a device that uses rotation, gravity and warm gasses to dry a material. These driers range from small household clothes dryers to large industrial systems. Regardless of their size, the majority of rotary dryers work the same way.<br />
  26. 26. VI. Drum dryer<br />adrum dryer is a rotating cylinder that uses steam or hot air to heat feedstockand reduce the moisture content during a manufacturing process<br />
  27. 27. Drum drying<br />Depending upon the products it will be processing, a drum dryer is typically made from cast iron or stainless steel. The length of time the feedstock remains on the drum depends on the original moisture content and the desired ending moisture content<br />
  28. 28. Drum drying process<br />
  29. 29. Application (Drum drying)<br />Powdered milk, starches, breakfast cereals, baby food, instant mashed potatoes<br />

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