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Powder and Bulk Engineering
Friday, July 25, 2014
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Powder and Bulk Engineering is a technical publication devoted to readers in the bulk solids market, worldwide.
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Item Details:
Publication Date: 11/2008
Pages: 6
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PDF Format
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$7.50
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Modifying your storage vessel for trouble-free continuous purging or conditioning — Part I

This two-part article explains how a conventional storage silo or bin can be modified to provide continuous purging or conditioning of dry bulk materials. Information covers the six criteria your plant's design engineer or a consulting bulk solids handling engineer can use in designing the vessel for successful operation. Part II will appear in December.

By introducing an upward-flowing gas into a storage silo or bin for handling dry bulk materials, you can use the vessel as an economical continuous purge vessel for stripping volatiles or as a continuous conditioning vessel for controlling material moisture. In a purge vessel (also called a purge column), a gas -- typically air or nitrogen -- passes upward through the downward-flowing material to strip volatiles from it, called devolatilization. Typically, the material is polymer and the volatiles are residual monomers and solvents. In a conditioning vessel, moisture (also considered a volatile) is added to or removed from a downward-flowing material stream by injecting upward-flowing air with a controlled humidity level into the material.

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