De-Stoner Plant
Tea is to be fed into air lift duct with uniform feed rate through a suitable band conveyor. Quantity and velocity of air along with available pressure at tea feeding point of lift duct would remain so adjusted and controlled that only lighter materials like tea would get lifted by air in the duct and comparatively heavier matters present in the stream of tea, like stones , iron particles and similar other materials would fall down at the bottom tray below lift duct.
Air stream with tea will then pass through cyclone for separation of desirable and usable tea from air. Most of further finer particles and other very fine and lighter particles like paper strips , wood shavings , human hair etc if present in tea would remain with air stream beyond cyclone. Air stream , therefore will go through a pulse jet bag filter before being let out in the atmosphere.
Bag filter , essentially has been proposed for air pollution control purpose. It has to be noted in this respect however that only portions of finer undesirable elements like paper strips , wood shavings , human hairs etc. remaining in free floating conditions in the air stream would get separated from tea and pass beyond cyclone. Such elements remaining in embedded condition with tea would come down with tea discharge in the cyclone.
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