Indirect Heating of Dryers
A dryer is used for the evaporation of liquids from solids. Most types of dryers are indirectly heated with either an internal exchanger coil or an external heat transfer jacket. This allows the use of remote heating and cooling utilities such as water or oil to precisely control temperatures inside the dryer. A moisture-laden product is introduced into the drying chamber and is heated to a temperature required to drive off liquid from the product. Many dryers operate under a vacuum to facilitate this evaporation.
Dryers are used to remove moisture from almost any material, from powders and flakes in pharmaceutical and chemical processes, to pellets, sheets and fibers in the plastics and textile industries. There are applications for dryers in the mining, food, printing, and paper industries as well; many materials need to be dried as part of their finishing operations.
To accurately size a heating system for a Dryer, the process should be analyzed for specific data, such as:
- The amount of material to be heated, including the mass of the process equipment itself, along with the temperatures and heat-up rate
- Thermal fluid flow rate must be considered; the dryer manufacturer can specify the flow rate, pressure drop, and pressure rating of the jacket
- The total volume of the thermal fluid media in the piping and jacket will help determine the system’s expansion tank capacity
- Drum Dryer
- Belt Dryer
- Shelf Dryer
- Vacuum Conical Dryer
- Paddle Dryer
- Filter Dryer
- Disc Dryer
- Column Dryer
- Rotary Dryer
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