The phenomenon of combustible dust explosions is present within many industries. Tests for explosibility of dust clouds per ASTM E1226 use a 20 L explosive chamber that places the combustible dust directly below the dispersion nozzle which generates a thorough mixture for testing purposes. However, in the underground coal mining industry, there are a number of geologic, mining, and regulatory factors that change the deposition scheme of combustible coal dust. This causes the atmosphere of a coal mine to have a variable rock dust-coal dust mixture at the time of ignition. To investigate the impact of this variable atmosphere, a series of lean explosibility tests were conducted on a sample of Pittsburgh Pulverized coal dust. These explosibility tests were conducted in a 38 L chamber with a 5 kJ Sobbe igniter. The 38 L chamber generates a variable air-dust mixture prior to ignition. The test results indicate that the 38 L chamber experiences reduced explosive pressures, and lower explosibility index values when compared to the 20 L chamber.
R. Q. Eades et al., "Evaluation of the 20 L Dust Explosibility Testing Chamber and Comparison to a Modified 38 L Vessel for Underground Coal," International Journal of Mining Science and Technology, vol. 28, no. 6, pp. 885-890, China University of Mining and Technology, Nov 2018.
The definitive version is available at https://doi.org/10.1016/j.ijmst.2018.05.016
Keywords and Phrases
Coal; Coal industry; Coal mines; Explosions; Explosives; Ignition; Mine dust; Mixtures; Coal mining; Combustible dust; Dust explosion; Explosibility; Explosibility index; Pulverized coals; Regulatory factors; Underground coal mining; Coal dust; Dust explosion; Explosibility testing
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01 Nov 2018