Method and system for detecting underground mine fires

Details Method and system for detecting underground mine fires Method and system for detecting underground mine fires

G - Physics

08

B

G08B 17/117 (2006.01) G01N 33/00 (2006.01) F02B 3/06 (2006.01)

Patent

CA 2042624

ABSTRACT OF THE DISCLOSURE A CO based, Diesel discriminating, fire detection system and method is disclosed which significantly reduces the threshold of CO needed to detect a fire in a mine that also contains CO from Diesel equipment without a corresponding increase in the number of false alarms. The system measures both the CO and NO levels at many points throughout the mine and calculates a CO/NO ratio for each of these locations. A long term average concentration (4 hours) and a short term average concentration (1 hour) for both CO and NO are continually updated to reflect the changing dynamics of the mine environment. Using the CO/NO ratio, the detection system can effectively differentiate between CO produced by a Diesel and CO produced from a fire and can activate an alarm when the CO level resulting from a fire exceeds a predetermined threshold level.

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