Frictional Ignition Suppression by the Use of Cutter-drum Mounted Sprays.
Agbede RO; Whitehead KL; Mundell RL; Saltsman RD
NTIS: PB/83-191593 :135 pages
The objective of this investigation was to conduct tests with a full- scale longwall shearer drum in a simulated mine environment to determine the effectiveness of drum-mounted water sprays in controlling frictional ignitions. The tests were conducted with a drum equipped with a single bit that cuts a sandstone block enclosed in a chamber filled with a combustible methane-air mixture. Without the sprays operating, no ignition occurred when only the carbide tip was impacting the stone. The likelihood of ignition increased with degree of bit wear and exposed steel contact area. Backflushing sprays, properly applied, were effective in controlling ignitions, but pickflushing and bit-cooling sprays were ineffective. Decreasing drum speed did not reduce the likelihood of ignitions until a bit peripheral speed of 200 fpm, 14 rpm for a 54-in drum, was reached.
CP; Final Contract Report;
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