kilburn engineering ltd.
fluid bed dryer fuel gas conditioning system tea dryers
 
 
 Range Of Products
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 Dryers & Coolers
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DRYERS & COOLERS
 
FLASH DRYERS
 
KILBURN manufactures Flash Dryers in technical Collaboration with M/S NARA MACHINERY COMPANY, JAPAN, the leading manufacturer of Flash Dryers in the world.

This design uses suspended particle drying techniques where surface moisture of the material is rapidly removed by dispersing the particulate solids in a heated stream of gas / air.
 
Flash Dryer
 
 
PRINCIPLE OF OPERATION
 
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The very word FLASH means instantaneous or rapid drying of products.
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There are five primary factors  which govern the speed of drying. These are :


Flash dryer
 
 
1. MOISTURE DISPERSION
 
4. PARTICLE STRUCTURE
     
This is defined as the accessibility of the moist surface to the drying medium (Hot air or gas). This is achieved in a flash dryer by use of a product disperser such as mechanical scatterer, double paddle feeder or cage mill etc. by mixing dried product in the feed.   Materials having capillaries will be able to evolve moisture to the surface from internal areas more rapidly resulting in swift drying action. Dense particles which have no voids are difficult to dry in a flash drying system.
     
2. TEMPERATURE DIFFERENTIAL
 
5. PARTICLE SIZE
     

In flash drying it is possible to use high initial temperatures. These are possible due to short contact time with the result that the product temperature never exceeds the wet bulb temperature of the gas unless all surface moisture is removed.

  Drying is accomplished by evaporation from the surface of the particle. Therefore to remove the internal moisture, it is necessary that the moisture reaches the surface by diffusion. This transfer will obviously take place most rapidly with smaller particles.
     
3. AGITATION
   
     

In Flash Dryer, agitation or turbulence is accomplished by the use of high gas velocities. The vapour film is continuously swept away from moist particles. As a result, moisture removal is practically instantaneous.

   
SALIENT FEATURES:
 
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Ideal for instantaneous
removal of   surface moisture.

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Minimum moving parts.
Easy to operate.
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Ideal for drying heat sensitive  materials wet bulb temperatures at short residence time.

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High Thermal efficiency.
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Ideal for large through-puts.

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Consistent product quality with
uniform   moisture content.

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Ideal for drying cakes, pastes,
abrasives, and sticky materials

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High  Heat   Transfer coefficient
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Ideal for both indoor and outdoor installation.

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Multifunctional system performing
drying, transportation and classifying
of material in a simultaneous operation.
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Ideal for use in combination with other
drying systems particularly fluid bed or
rotary   dryers.

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Low capital equipment cost.
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Quick plant start-up and adjustment
of operating conditions
 
TYPICAL ARRANGEMENTS
 
Several arrangements are possible for individual application to suit specification. A few arrangements are shown here. The basic components can be changed on need & application basis.
Flash Drying System
 
 
Flash Drying System
 
 
APPLICATIONS
 
Flash drying can be considered in almost any application where a Filter Cake, Centrifuge Cake, Sludge or Damp solids can be converted to a dry powder.
 
This technique can be economically utilized on practically any material ranging from heat sensitive Pharmaceuticals like sulfa drugs, Penicillin, Food Materials like Cocoa Cake, Starch, Chemicals like Cellulose, PVC, Metallic Stearates, Minerals and Ceramics like Calcium Carbonates, Clay, and many other materials .
This technique is most economical if only surface moisture is to be removed.
 
 

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