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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

Abstract

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.

Inventors:
 [1]
  1. Hardin, MT
Issue Date:
Research Org.:
Western Syncoal Company (Billings, MT)
OSTI Identifier:
870688
Patent Number(s):
5575085
Assignee:
Western Syncoal Company (Billings, MT)
DOE Contract Number:  
FC22-90PC89664
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
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/

Citation Formats

Groombridge, Clifton E. Apparatus and method for controlling the rotary airlocks in a coal processing system by reversing the motor current rotating the air lock. United States: N. p., 1996. Web.
Groombridge, Clifton E. Apparatus and method for controlling the rotary airlocks in a coal processing system by reversing the motor current rotating the air lock. United States.
Groombridge, Clifton E. Mon . "Apparatus and method for controlling the rotary airlocks in a coal processing system by reversing the motor current rotating the air lock". United States. https://www.osti.gov/servlets/purl/870688.
@article{osti_870688,
title = {Apparatus and method for controlling the rotary airlocks in a coal processing system by reversing the motor current rotating the air lock},
author = {Groombridge, Clifton E},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {1}
}

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