Industrial Dryers

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Spray drying is the technology most widely used in the liquid technology shaping and in the drying industry. The drying technology is most suitable for producing solid powder or particle products from liquid materials, such as: solution, emulsion, suspension and pumpable paste states ,For this reason, when the particle size and distribution of the final products, residual water contents, mass density and the particle shape must meet the precise standard, spray drying is one of the most desired technologies. In an Open Cycle Spray Dryer, the drying air is drawn from the atmosphere, heated, conveyed through the chamber and then exhausted to the atmosphere. This is most commonly used design.

Below are a few of the components:

• Feed storage.
• Feed Pump
• Hot air Generator.
• Drying chamber.
• Cyclone
• Pollution control system

Product Details:

These Multiple-Stage Drying Systems are used for a wide range of polymer products.

It is the combination of spray dryer and fluid bed dryer, fluid bed dryer can be used for removal of the surface moisture while a drying system providing longer residence time would be used for removal of bound moisture. For example, a fluid bed dryer can be used as the second drying stage.

Multi stage drying system is formed when a quantity of a solid particulate substance (usually present in a product container) is placed under appropriate conditions to cause the solid / binding agent mixture to behave as a fluid. This is usually achieved by the introduction of pressurized fluid through the particulate medium. These results in the product move up and down and disperse into the air between the filter bag housing and the product container. The resulting phenomenon is called fluidization.

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There are many variations on this design, with the most important being the "direct heated" or "self-energizing" system. In the self-energizing design, a direct-fired heater is used and the air entering the system is limited to that required for combustion. An amount of air equal to the combustion air is bled from the system at the other end of the process. The gas (mainly products of combustion) is recycled through the dryer. The recycled gas has a very low oxygen content, making it suitable for materials that cannot be exposed to oxygen, due to explosive hazard or product degradation. This Semi Closed Cycle Dryer design is a hybrid configuration of both open and closed cycle dryers and it is not gas tight.

Semi-closed Cycle Layout

A few components of the Semi-Closed Cycle layout as per the diagram are

• Combustion air
• Coolant
• Feedstock
• Fuel
• Condensed waste discharge
• Dried product
• Dryer chamber
• Cyclone
• Indirect heater
• Heat exchanger
• Scrubber/condenser
• Transport cyclone
• Pneumatic transport system

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