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

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.
  1. (Hardin, MT)
Issue Date:
OSTI Identifier:
Western Syncoal Company (Billings, MT) NETL
Patent Number(s):
US 5575085
Contract Number:
Research Org:
Western Syncoal Company (Billings, MT)
Country of Publication:
United States
apparatus; method; controlling; rotary; airlocks; coal; processing; reversing; motor; current; rotating; air; lock; improvement; hard; materials; found; jamming; inflow; outflow; driven; reversible; instantaneous; continually; monitored; compared; predetermined; value; overcurrent; condition; occurs; indicating; airlock; controller; means; starts; soft; reverse; rotation; clearing; patterns; reversal; provided; air lock; motor current; predetermined value; reversible motor; reverse rotation; coal processing; condition occurs; hard material; hard materials; rotary airlock; coal process; /34/110/318/417/