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Rapid (grab) sampling during full-scale explosions--microscopic and analytical evaluation
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1988
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Series: Mining Publications
[PDF-3.18 MB]
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Description:"The Bureau of Mines has developed a system using a high-speed electropneumatic mechanism for the rapid (grab) sampling of dusts and gases during an explosion. The sampling system consists of an aluminum housing that incorporates two 30-cm3 pre-evacuated glass vials with rubber septums. Upon actuation, the sampling probe needle is driven through the septum with a pressurized air pulse, filling the tube with gas and dust from the mine explosion. After a predetermined time, the sampling probe needle is retracted by a second high-pressure air pulse to its normal (quiescent) state, allowing the sampling tube to reseal. The onset and the duration of sampling are independently variable and controlled by a time-delay relay package. This technique enables the monitoring of pyrolysis-charring in coal particles and the generation and combustion of the pyrolysis vapors in both large- and small-scale explosions. The following results were obtained from full-scale dust explosion tests at the Bureau of Mines Lake Lynn Laboratory: (1) gas sampling of the leading edge of the flame front shows the large concentration changes, characteristic of the flame front
(2) gas samples taken entirely in the flame zone consist of pyrolysis and combustion products with very low residual oxygen
and (3) the particles collected in the flame zone show signs of extensive pyrolysis and charring." - NIOSHTIC-2
NIOSHTIC no. 10006240
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Pages in Document:17 numbered pages
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NIOSHTIC Number:nn:10006240
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