Differences in smoldering characteristics of coal piles with different smoldering propagation directions

Qi, Guansheng; Lu, Wei; Qi, Xuyao; Zhong, Xiaoxing; Cheng, Weimin; Liu, Fangming

doi:10.1016/j.firesaf.2018.11.004

Cited by 24 publications

(3 citation statements)

References 28 publications

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“…The analysis of different ventilation features has been increased over time, defining the airflow performance [10] and the evolution of the environmental conditions in a fire [11], obtaining the intensity of the fire generated, its duration, the pollutants generated or the visibility level in the drifts [12]. Their study identified that it is important to understand critical elements of the mine, such as the evacuation route, where to locate the rescue chambers, possible changes in airflow direction or what techniques are useful to extinguish the fire, as well as to determine fundamental elements in underground mine fires like, back-layering [13], smouldering [14] or how to act appropriately when an event of this nature is generated. However, it is necessary to validate the studies in a real mine and see the effectiveness of the measures studied.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Fire Propagation in a Sublevel Coal Mine

et al. 2020

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A fire has been analyzed in a real underground coal mine, using a sublevel method, during an entire year. The study was focused on the collapsed area, reproducing a real mixture formed by coal, waste, and air gap. The analysis was done by means of an experimental analysis, a computational fuid dynamic model (CFD), and simulations using a mine ventilation software. Three scenarios were determined and studied regarding their influence on the evolution of the fire: (a) development of the fire without taking any action, (b) sealing off the affected areas, and (c) sealing and reducing the ventilation in the affected area and surrounding drifts. The study revealed the behavior of the fire in a real mine and the effectiveness of the main fire-fighting measures over time, verifying that none of the measures taken could eliminate the fire-induced in the collapsed area.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Fire Propagation in a Sublevel Coal Mine

et al. 2020

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“…Deng et al [13] tested the heat release intensity and oxygen consumption rate of the coal samples with a temperature-programmed device and calculated the change law of gas products of coal spontaneous combustion. Qi et al [14] built a similar experimental platform for coal smoldering simulation and studied the smoldering characteristics of coal fire under different air supply rates. Wen et al [15] compared and analyzed the characterization parameters of coal spontaneous combustion through two different experimental systems, the large-scale coal spontaneous combustion experiment, and the isothermal difference leading experiment.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of External Air Supply and Temperature Control on Coal Spontaneous Combustion Characteristics

et al. 2023

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Coal spontaneous combustion in underground mine goaf has a great impact on coal mining. The temperature-programmed experiment is a commonly used and effective method for studying the characteristics of coal spontaneous combustion. Aiming at the problem that the numerical simulation of coal spontaneous combustion characteristics under the condition of external air supply and temperature control in a temperature-programmed experiment is insufficient, a multi-physical field coupling numerical model of coal spontaneous combustion in the temperature-programmed experiment is established. The variation characteristics of coal temperature, oxygen, and oxidation products under external air supply and temperature control were studied. The results show that the numerical simulation results are consistent with the experimental results. With the increase in temperature, the volume fractions of oxygen and carbon dioxide decrease and increase, respectively. As the air supply volume increases, the oxygen volume fraction at the outlet increases, and the peak value of the oxygen volume fraction change rate exhibits a “hysteresis” feature, and the time corresponding to the peak value increases. Moreover, the temperature change rate increases. With the increase in the heating rate, the peak value of the oxygen volume fraction change rate increases and shows an “early appearance” characteristic, at the same time, the maximum coal temperature displays a linear increase trend.

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“…Several attempts to define the characteristics have made by means of theoretical analysis lab equipment, such as examining the smoldering characteristics [23,24] and self-heating [25,26]. Here, we use a very interesting approach to study coal fires under lab conditions [8,23].…”

Section: Introductionmentioning

confidence: 99%

Determination and Fire Analysis of Gob Characteristics Using CFD

et al. 2020

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A laboratory-scale analysis using coal from an underground mine was carried out, emulating a mixture from the gob area in an actual mine, consisting of waste, coal, and free space for the flow of air. Experimental tests and computational fluid dynamics modelling were done to define and verify the behavior of the collapsed region in a time-dependent analysis. In addition, the characteristics of coal were defined, regarding the self-combustion, combustion rate, and pollutants generated in each stage of the fire. The results achieved are useful for determining the behavior of the collapsed area in full-scale conditions and to provide valuable information to study different scenarios of a potential fire in a real sublevel coal mine regarding how the heat is spread in the gob and how pollutants are generated.

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Differences in smoldering characteristics of coal piles with different smoldering propagation directions

Cited by 24 publications

References 28 publications

Analysis of the Fire Propagation in a Sublevel Coal Mine

Analysis of the Fire Propagation in a Sublevel Coal Mine

Study on the Effect of External Air Supply and Temperature Control on Coal Spontaneous Combustion Characteristics

Determination and Fire Analysis of Gob Characteristics Using CFD

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