What type of dryers force hot gas through a vertical or horizontal flash tube, causing the moist solids to become suspended?
A. Flash dryers
B. Fluid bed dryers
C. Fixed bed dryers
D. Rotary dryers
A. Correct. Flash dryers are devices that force hot gas (usually air or nitrogen) through a vertical or horizontal flash tube, causing the moist solids to become suspended.
B. Incorrect. A fluid bed dryer uses hot gases (usually air) passed upward through wet solids at a velocity high enough to lift the solids and cause them to act like a fluid.
C. Incorrect. Fixed bed dryers are devices that use desiccants (substances that attract and adsorb moisture) to remove moisture from a process stream.
D. Incorrect. Rotary dryers are devices composed of large, rotating, cylindrical tubes that reduce the moisture content of a material by bringing it into direct contact with a heated gas.
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