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The effects of coal dust concentrations and particle sizes on the minimum auto‐ignition temperature of a coal dust cloud
Flash fires and explosions in areas containing an enriched combustible dust atmosphere are a major safety concern in industrial processing. An experimental study was conducted to analyse the effects of atmospheric coal dust particle sizes and concentrations on the minimum auto‐ignition temperature (MAIT) of a dust cloud. Two different coal samples from Australian coal mines were used. The coal dust particles were prepared and sized in 3 ranges, of below 74 μm, 74 to 125 μm and 125 to 212 μm, by using a series of sieves and a sieve shaker. A humidifier was used to increase the moisture content of the particles to the required level. All the experiments were conducted in accordance with the ASTM E1491‐06 method in a calibrated Goldbert‐Greenwald furnace. The results from this study indicate that coal dust properties, such as the chemical nature (H/C), concentration, particle size (D 50 ), and moisture content, impact on the MAIT. For coal dust concentrations less than 1000 g.m −3 , the MAIT decreases with increasing coal dust concentrations. On the other hand, for low concentrations of 100 to 15 g.m −3 , the MAIT becomes more reliable for particle size D 50 rather than for volatile matters.
The effects of coal dust concentrations and particle sizes on the minimum auto‐ignition temperature of a coal dust cloud
Flash fires and explosions in areas containing an enriched combustible dust atmosphere are a major safety concern in industrial processing. An experimental study was conducted to analyse the effects of atmospheric coal dust particle sizes and concentrations on the minimum auto‐ignition temperature (MAIT) of a dust cloud. Two different coal samples from Australian coal mines were used. The coal dust particles were prepared and sized in 3 ranges, of below 74 μm, 74 to 125 μm and 125 to 212 μm, by using a series of sieves and a sieve shaker. A humidifier was used to increase the moisture content of the particles to the required level. All the experiments were conducted in accordance with the ASTM E1491‐06 method in a calibrated Goldbert‐Greenwald furnace. The results from this study indicate that coal dust properties, such as the chemical nature (H/C), concentration, particle size (D 50 ), and moisture content, impact on the MAIT. For coal dust concentrations less than 1000 g.m −3 , the MAIT decreases with increasing coal dust concentrations. On the other hand, for low concentrations of 100 to 15 g.m −3 , the MAIT becomes more reliable for particle size D 50 rather than for volatile matters.
The effects of coal dust concentrations and particle sizes on the minimum auto‐ignition temperature of a coal dust cloud
Ajrash, Mohammed Jabbar (Autor:in) / Zanganeh, Jafar / Moghtaderi, Behdad
Fire and materials ; 41
2017
Aufsatz (Zeitschrift)
Englisch
Coal dust , Fires , Temperature , Dust , Sieves , volatile matter , coal ignition , Explosions , Ignition temperature , Coal , Coal mines , Flammability , ventilation air methane , coal dust , Ignition , Low concentrations , Particle size , Particulates , Moisture content , Moisture , flash fire , Australian coal
| British Library Online Contents | 2017
| British Library Online Contents | 2016
Ignition of firedamp and coal-dust by electricity
Engineering Index Backfile | 1898