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May, 1978 <br /> MERMU DRYER -- AIR QUALITY <br /> Mid-Continent has built a second F1uoSolids dryer at its coal <br /> preparation facility serving the Coal Basin Mines. Both dryers were <br /> designed by Dorr-Oliver of Stamford, Connecticut, and employ the <br /> Fluid-Bed process. This process involves a reactor or dryer having <br /> a fluid bed in which intimate gas-solids contact is obtained. In <br /> this bed heated air is blown -through a mass of solid particles at a <br /> velocity which causes the mass to become turbulent so that it resem- <br /> bles a boiling liquid. Agitation in the bed is violent and results <br /> in a rapid heat exchange. <br /> The new dryer employs a Ducon Vertical Venturi Oriclone Scrubber <br /> system to remove pollutants from the exit gases. The scrubber is a <br /> size 80S/162 Type WO, operating with a 12-inch W.G. pressure drop. <br /> The Ducon WO Venturi Scrubber consists of a "wet approach" <br /> Venturi followed by a liquid entrainment separator. The dust-laden <br /> gas enters the gas inlet of the Venturi and makes contact with the <br /> scrubbing liquid which is swirling down the walls of the converging <br /> portion of the "wet approach" Venturi. This "wet approach" section <br /> converges to the Venturi throat section where the dirty gas and <br /> scrubbing liquid collide. Here the liquid is broken down into fine <br /> droplets which trap the dust particles. The mixture of gas and <br /> liquid leaves the Venturi and is separated by centrifugal action in <br />