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Category: Design Considerations

Design Considerations

Solid Bed Dehydrator – Desiccant Selection

Posted on September 21, 2009

No desiccant is perfect or best for all applications. In some applications the desiccant choice is determined primarily by economics. Sometimes the process conditions control…

Design Considerations

Solid Bed Dehydrator – Moisture Content of Inlet Gas

Posted on September 21, 2009

An important variable that determines the size of a given desiccant bed is the relative saturation of the inlet gas. This variable is the driving…

Design Considerations

Solid Bed Dehydrator – Pressure Drop

Posted on September 21, 2009

Towers are sized for a design pressure drop of about 5 psi through the desiccant. The pressure drop can be estimated by: Pressure drops of…

Design Considerations

Solid Bed Dehydrator – Bed Height to Diameter Ratio

Posted on September 21, 2009

In its simplest form, an adsorber is normally a cylindrical tower filled with a solid desiccant. The depth of the desiccant may vary from a…

Design Considerations

Solid Bed Dehydrator – Gas Velocities

Posted on September 21, 2009

Generally, as the gas velocity during the drying cycle decreases, the ability of the desiccant to dehydrate the gas increases. At lower actual velocities, drier…

Design Considerations

Solid Bed Dehydrator – Cycle Time

Posted on September 21, 2009

Most adsorbers operate on a fixed drying cycle time and, frequently, the cycle time is set for the worst conditions. However, the adsorbent capacity is…

Design Considerations

Solid Bed Dehydrator – Pressure

Posted on September 21, 2009

Generally, the adsorption capacity of a dry bed unit decreases as the pressure is lowered. If the dehydrators are operated well below the design pressure,…

Design Considerations

Solid Bed Dehydrator – Temperature

Posted on September 21, 2009

Adsorption plant operation is very sensitive to the temperature of the incoming gas. Generally, the adsorption efficiency decreases as the temperature increases. The temperature of…

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