A correlation between composition and explosibility index for coal dust

Torrent, Javier García; Armada, Iñigo S.; Pedreira, Ramón A.

doi:10.1016/0016-2361(88)90206-2

Cited by 15 publications

(5 citation statements)

References 1 publication

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“…Gummer (2003) built a large vertical scale apparatus (2 m long and 0.3 m in diameter) to investigate the MAIT for coal dust particles and showed that the MAIT increased significantly as the particle size increased . The research outcomes of Torrent showed that the MAIT for a dust cloud is a function of coal dust properties, such as volatile matter. He observed that the explosion is more rigorous for coal dusts with higher concentrations of volatiles.…”

Section: Introductionmentioning

confidence: 99%

The effects of coal dust concentrations and particle sizes on the minimum auto‐ignition temperature of a coal dust cloud

2017

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Summary 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 (D50), 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 D50 rather than for volatile matters.

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Section: Introductionmentioning

confidence: 99%

The effects of coal dust concentrations and particle sizes on the minimum auto‐ignition temperature of a coal dust cloud

2017

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“…Many scholars have studied the micromorphological changes in coal dust before and after the explosion and reported that the pore structure and particle size of postexplosion coal dust are associated with volatile matter content. Torrent et al 58,59 reported that there is a significantly high correlation between the volatile content and explosion index of coal dust by analyzing 90 coal samples. Qian et al 47 concluded that the volatile content of coal dust is usually used to evaluate the explosibility of coal dust.…”

Section: Results and Analysismentioning

confidence: 99%

Experimental Analysis on Gas and Solid Residues of Pre- and Post-explosion Coal Dust

et al. 2020

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The gas and solid residues after coal explosion contain abundant information that can reflect the reaction mechanism and hazardous effects of coal dust explosion. To investigate the characteristics of gas and solid products of coal dust explosion, experiments were conducted in a 20 L spherical explosion vessel. The micromorphology characteristics and chemical functional groups of solid residues were observed by scanning electron microscopy and Fourier-transform infrared (FTIR) spectroscopy analysis. Moreover, the composition and concentration of gas residues were tested by gas chromatography. The results indicated that the coal with low metamorphism after the explosion showed a significant decrease in the volatile content, and more holes and finer particles appeared on the surface of the coal dust particles. In the coal dust explosion process, oxygen-containing functional groups with FTIR bands at 1800−1000 cm −1 and aromatic structures with bands at 900−700 cm −1 are largely consumed, while the aliphatic structures with bands at 3000−2800 cm −1 disappeared. Furthermore, the main gas components after coal dust explosion were O 2 , N 2 , CO 2 , CO, CH 4 , and C 2 H 4 , and the presence of hazardous gas and lack of oxygen pose a threat to people's lives and safety. The characteristics of gas and solid residues after coal dust explosion can be applied to identify and analyze coal dust explosion accidents and provide a reference for determining the degree of coal dust participating in explosions and the essential causes of explosion accidents.

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“…The ignition characteristics are a function of fuel chemical composition, such as volatile, moisture and ash contents and physical properties, e.g., particle size, particle shape and surface area. Torrent et al [4,5] developed a correlation between the fuel composition and the explosibility of coal dust, in which the fuels were categorized into three groups based on the explosion hazard and were found to be most influenced by the volatile content. However, in the study no physical properties were taken into account [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…Torrent et al [4,5] developed a correlation between the fuel composition and the explosibility of coal dust, in which the fuels were categorized into three groups based on the explosion hazard and were found to be most influenced by the volatile content. However, in the study no physical properties were taken into account [4,5]. The particle size is a decisive parameter for ignition and explosion characteristics of dust, as ignition can be completely hindered by coarse particles [6].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations of the Ignitability of Several Coal Dust Qualities

Youssefi

Segers²,

Norman³

et al. 2021

Energies

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The ignition characteristics of coal dust is of high importance for the flame stability in coal-fired power plants. We investigate the ignitability of six lignite dust qualities and one hard coal using dust explosion tests and an ignitability characteristic number. The paper aims to identify the degree of impact of the properties of coals, such as the moisture content, the ash content etc., on the ignition characteristics and ultimately to compare the identified relevant ignition parameters to the ignition performance of the dust qualities in an industrially relevant environment. The minimum cloud ignition temperature (MCIT), the maximum rate of pressure rise ((dp/dt)max), the maximum explosion pressure (pmax), the deflagration index (Kst-value) and the modified ignitability characteristic number (ZWZmod.) were determined and were attributed to the moisture content, the ash content and the median particle size. The MCIT was largely influenced by the volatile content, whereas the variations of moisture and ash contents within the range of 10% to 20% did not have a significant impact on the MCIT. The maximum explosion pressure did not differ considerably and stayed in a narrow range among the tested dust qualities. The deflagration index showed a higher sensitivity to the dust properties. The deflagration index and the modified ignitability characteristics number dropped as the moisture content increased and the volatile content reduced. The Kst and ZWZmod. values showed the highest susceptibility to the coal dust properties. Hence, they were used as representative parameters for further comparison with the ignition performance of coal dust in a pilot-scale testing. The results showed that both parameters predicted the ignition performance relatively well and can be used as indicators for the prediction of the ignition performance.

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A correlation between composition and explosibility index for coal dust

Cited by 15 publications

References 1 publication

The effects of coal dust concentrations and particle sizes on the minimum auto‐ignition temperature of a coal dust cloud

The effects of coal dust concentrations and particle sizes on the minimum auto‐ignition temperature of a coal dust cloud

Experimental Analysis on Gas and Solid Residues of Pre- and Post-explosion Coal Dust

Experimental Investigations of the Ignitability of Several Coal Dust Qualities

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