Over view of Flash Dryer

By: doyouknow | Views: 3316 | Date: 29-Nov-2011

Flash dryer is a continuous drying plant used for drying variety of wet cakes by disintegrating wet cake into fine powder and dried by hot air to form powder. The whole process is fully automatic requiring no handling or human involvement.


Flash dryer is a continuous drying plant used for drying variety of wet cakes by disintegrating wet cake into fine powder and dried by hot air to form powder. The whole process is fully automatic requiring no handling or human involvement. The feed rate is adjusted automatically as per the variation in moisture content in wet cake thereby achieving consistent product quality.

The principle of Flash Drying is to evaporate surface moisture instantaneously. The word “flash” is used, as the drying time is very less from milli to few seconds. It is well known fact that the surface area of wet lump increases as the size of lump decreases. The wet cake is disintegrated into fines to increase the surface area. The drying is instantaneous and the material remains at wet bulb temperature of air. Hence it is also called as "wet bulb drying".

The air velocities are similar to that of pneumatic conveying. The powder remains suspended in air and gets conveyed while drying. Hence it is also called as pneumatic dryer. The retention of a given solids particles in the system is very short, typically in seconds.

These make it ideal for drying heat sensitive, easily oxidized, materials that cannot be exposed to process conditions for extended periods.
Flash dryer is energy efficient, requiring no intermediate material handling. It is a continuous production machine suitable for pasty / sticky wet cakes. These unique features make it ideal replacement for conventional tray and rotary drying.

• Wet cake is fed in feed mechanism. The feed mechanism consists of balance tank, stirrer and screw feeder.
• The stirrer feeds the screw feeder. The screw feeder gives controlled feed at rated capacity to disintegrator.
• The air after passing through Air Filter is heated in Oil fired hot air generator or steam / thermic fluid based radiator.
• Hot air and wet cake get thoroughly mixed in the cage mill type disintegrator. Disintegration and drying of wet cake takes place in disintegrator.
• Wet cake is rapidly dried and about 50% drying take place in the disintegrator.
• Drying duct conveys the pulverized material to cyclone. Drying gets completed in conveying duct.
• The time taken by disintegrated powder to travel through drying duct is called residence time of drying.
• The material looses moisture that is absorbed by hot air. The temperature of air reduces while its humidity increases.
• Powder is further dried in cyclone. Separation of dried powder and air takes place in cyclone. Powder is discharged from cyclone through powder discharge valves.
• Fine particles escaped from cyclone are conveyed to bag filter.
• Bag filter recovers the fine particles. The air coming out of bag filter is dust free and confirms to pollution control norms.
• Two blowers, one at inlet & other at outlet, working on Push-Pull principle maintain the airflow in the system.
• Push-Pull principle ensures that the ambient pressure is maintained at feeding system to avoid dusting of material. Also it avoids extreme pressures (either positive or negative) in the system.
• The powder collected from cyclone and bag filter can be pneumatically conveyed to storage bin or bagging section.


1. Feeding Mechanism
2. Cage Mill Disintegrator
3. F. D. Fan and I. D. Fan
4. Drying cum Conveying Duct
5. Control Panel & Instrumentation



Easy to Operate:

1. Fully automatic machine consisting of following

• Appropriate safety interlocks.
• PID temperature controller for ensuring constant air inlet temperature. Steady state of burner giving minimum maintenance of burner.
• PID temperature controller with variable speed drive for screw feeder ensuring constant air outlet temperature.
• Audio alarms for any deviation from the set parameter.
• Continuous monitoring / recording of vital parameters.

2. Parameters like airflow rate, fuel firing rate, temperatures and so on, are set once for all for a given material properties at the time of commissioning. Hence it is easy to operate in subsequent runs.

Easy to diagnose problems:

1. The dryer is easy to diagnose for problems due to following facilities-

• Continuous visual indication.
• Manometers for pressure drops of critical components.
• Viewing windows at strategic locations.

2. In our service manual exhaustive troubleshooting chart is given. Prior to handing over the dryer our service engineer educates the operators by simulating various operating conditions.

This makes the Flash Dryer user friendly.


• Reduced running cost.
• Continuous production machine without human touch.
• Ideal replacement for tray drying of wet cakes.
• Extremely sticky /pasty wet cake can be handled.
• Particle size as fine as 500 mesh is achievable.
• Low residence time – minimum exposure to heat – retains original product quality.
• On line particle size reduction-eliminating need of separate pulverizer.
• No product degradation or charring.
• Proprietary design of disintegrator ensures uniform mixing of wet cake and hot air giving consistent and homogeneous powder quality.
• Fully Automatic – needs little running attention.
• Negligible material dusting.
• High volume processing.
• Large filtering area of Bag filter – reduced pressure drop – large savings in power consumption of blower.
• Measurement of pressure drops at various places facilitates easy trouble shooting and maintenance.


 Chemicals - Inorganic & Organic
 Pesticides and Agricultural Chemicals
 Dyestuff and Pigments – Organic & Inorganic
 Fertilizers
 Mineral Ore Concentrates
 Technical Ceramics
 Food Industry
 Pharmaceutical Industry
 Agricultural extracts


Previous Page Next Page

People Searching On This Page:
  • spin flash dryeR ID AND FD balance
  • pneumatic drying
  • pneumatic dryers
  • pneumatic dryer
  • flash dryers
  • flash dryer disintegrator
  • overview of flash dryer
  • flash dryer plans
  • flash dryer burner
  • cage milll type disintegrator
  • spin flash dryer principle
  • ID fan in flash dryer
  • flash dryer
  • spin flash dryer

Related Pages

Maruti Suzuki Ertiga Review & Features

Maruti Suzuki Ertiga Review & Features

Articles | Automotive | Cars
23-Mar-2012  Views: 2418

Maruti Suzuki India has finally unveiled the 7-seater MUV "Ertiga" at the 2012 auto expo in New Delhi on 6th January, 2012.It is expected to be availa ...
Overview of Boiler

Overview of Boiler

Articles | Engineering
15-Dec-2011  Views: 6699

Vessel that heats water to become hot water or steam• At atmospheric pressure water volume increases 1,600 times• Hot water or steam used to transfer ...
Overview of Continuous distillation

Overview of Continuous distillation

Articles | Engineering
09-Dec-2011  Views: 4507

Continuous distillation is an ongoing separation process in which a liquid mixture of two or more miscible components is continuously fed into the pro ...
Hero Impulse Review

Hero Impulse Review

Articles | Automotive | Motorcycles
06-Dec-2011  Views: 4509

Hero Impulse which is slated for Diwali Release will be available for a price tag of Rs Rs 66800. The dirt bike is powered with 150CC engine and is re ...
Overview of Fluid Bed Dryer

Overview of Fluid Bed Dryer

Articles | Engineering
29-Nov-2011  Views: 5124

Fluid bed processing involves drying, cooling, agglomeration, granulation, and coating of particulate materials. It is ideal for a wide range of both ...
Post Your Comments (No Login Require)
Name : (required)
Email : (required)
Website :

Comment : (required)

2  + 2 =     
People Searched About:
Spin Flash Dryer ID AND FD Balance   |   Pneumatic Drying   |   Pneumatic Dryers   |   Pneumatic Dryer   |   Flash Dryers   |   Flash Dryer Disintegrator   |   Overview Of Flash Dryer   |   Flash Dryer Plans   |   Flash Dryer Burner   |   Cage Milll Type Disintegrator   |  
Google : 895 times | Yahoo : 76 times | Bing : 390 times |