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Apparatus and method for controlling the rotary airlocks in a coal processing system by reversing the motor current rotating the air lock

United States Patent

*** EXPIRED ***
November 19, 1996
View the Complete Patent at the US Patent & Trademark Office
An improvement to a coal processing system where hard materials found in the coal may cause jamming of either inflow or outflow rotary airlocks, each driven by a reversible motor. The instantaneous current used by the motor is continually monitored and compared to a predetermined value. If an overcurrent condition occurs, indicating a jamming of the airlock, a controller means starts a "soft" reverse rotation of the motor thereby clearing the jamming. Three patterns of the motor reversal are provided.
Groombridge; Clifton E. (Hardin, MT)
Western Syncoal Company (Billings, MT)
08/ 504,055
July 17, 1995
The Government of the United States of America has certain rights in this invention pursuant to contract No. DE-FC22-90PC89664 awarded by the U.S. Department of Energy.