Fuller Company

Donald S Boyhont

Jay Warshawsky

Paul E Solt

Apparatus for conveying solid particulate material including a casing having bore therethrough and an inlet for material to be conveyed and an outlet. A screw impeller is rotatably mounted in the casing by front and rear bearings with the rear bearing being near the inlet. The outlet is intermediate the inlet and the forward bearing. A discharge chamber is flow connected immediately adjacent the casing outlet. Nozzles for supplying gas under pressure are provided in the discharge chamber for discharging material from the discharge chamber into and through a pneumatic conveying line. The screw impeller includes a feed screw section which terminates adjacent the casing outlet and a reversing section with reverse flights between the forward bearing and the casing outlet to prevent material from entering the forward bearing. A restriction plate may be placed in the casing outlet to reduce the size of the outlet opening to less than the bore through the casing. A flap valve is provided which swings away from the casing outlet and discharge chamber inlet for establishing an initial material seal.

Pneumatic conveying device

An apparatus for burning cement raw meal to produce cement clinker which includes a pair of parallel suspension preheaters each adapted to receive cement raw meal and hot spent combustion gas for preheating the cement raw meal. Each of the suspension preheaters discharges preheated raw meal into a single calcining furnace. Combustion takes place in the calcining furnace to produce a calcined raw meal. The spent combustion gases from the calcining furnace are supplied in proportional quantities to each of the parallel suspension preheaters. From the calcining furnace, the calcined raw meal is supplied to a rotary kiln for clinkering the calcined raw meal. Hot cement clinker is discharged into a cooler where the clinker is cooled by passing cooling air upwardly therethrough. The cooling air is heated by the hot clinker and the hottest portion is supplied to the rotary kiln and to the calcining furnace to serve as combustion air. The system is particularly designed for use in converting an existing suspension preheater dry process cement plant to an installation employing a flash furnace to thereby increase the capacity of the plant.

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Nazareth, PA, United States of America

Donald S Boyhont