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A Method to Evaluate the Effectiveness of Coal Fire Extinguishing Agents.

Ryan-MW; Smith-AC; Lazzara-CP
Ch 11 in Proc SME Annual Meeting SME 1992 :105-114
The U.S. Bureau of Mines developed an experimental method to evaluate the relative effectiveness of water additives on the extinguishment of coal fires. The experiments were conducted in the fire zone of the multiple-entry section of the Bruceton experimental mine. Chambers filled with 180 kg of Pittsburgh seam coal were ignited and allowed to burn until well-developed fires were achieved. Extinguishing agent-water solutions were then applied to the fires and the quantity required to extinguish the fires compared to the amount of water alone required to extinguish similar fires. A 20-pct diammonium phosphate-water solution required an average of 22 l to extinguish the coal fires, while two commercially available additive-water solutions required averages of 30.6 and 30.3 L. The average amount of water required to extinguish the fires was 28 l. An analysis of covariance, using the thermal energy of the coalbed, q, to quantify the fire at the time of extinguishment, showed that the diammonium phosphate-water solution was slightly more effective at extinguishing these coal fires than water alone, while the two commercially available additive-water solutions were statistically equivalent to water alone.
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OP 72-92
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Ch. 11 in Proc., SME Annual Meeting. SME, 1992, PP. 105-114