Improved computational fluid dynamics modelling of coal spontaneous combustion control and gas management

Qiao, Ming; Ren, Ting; Roberts, Jon; Liu, Hongwei; Yang, Xiaohan; Tan, Lihai; Wu, Jianming

doi:10.1016/j.fuel.2022.124456

Cited by 27 publications

(5 citation statements)

References 46 publications

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“…At present, numerical calculation is the main tool for studying the gas migration process in large-scale mining areas. − Taking the 8105 working face of the Madaotou mine as the engineering background, Fluent 3D numerical calculation software was used to establish a numerical calculation model of the flow field in the working face of extra-thick spontaneous combustion coal seams. On this basis, the effects of nitrogen injection in the goaf and air intake in working face on the distribution of oxygen concentration in the mining area were studied.…”

Section: Methodsmentioning

confidence: 99%

“…In general, when the oxygen concentration is below 18.5%, personnel’s work ability decreases and breathing begins to be difficult. In addition, in order to effectively inhibit the spontaneous combustion of residual coal in the goaf, nitrogen will be injected during the mining process. , The “technical specifications for nitrogen fire prevention and extinguishing in coal mines” stipulate that the oxygen concentration in the working face during nitrogen injection should not be less than 18.5%. In summary, the phenomenon when the oxygen concentration of the working face is less than 18.5% is defined as a low-oxygen phenomenon.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Low-Temperature Oxygen Consumption and Low-Oxygen Gas Emission Law in Goaf of Ultrathick Coal Seams

Zheng,

Liu,

Liu

et al. 2024

ACS Omega

Self Cite

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Low-oxygen (oxygen concentration below 18.5%) phenomena often occur in the top coal caving working face of ultrathick coal seams, posing a serious threat to the safety of workers. The characteristics of oxygen consumption and gas production at low-constant temperature and the corresponding functional group evolution of residual coal in goaf were studied by temperatureprogrammed and infrared spectrum experiments. The influence of different factors on the emission of low-oxygen gases was studied through numerical calculation. The results show that low-temperature oxygen consumption and gas production occurred when the coal was about 40 °C. When the temperature was constant, the oxygen consumption and gas production rate increased with the extension of time. In the early stage of coal oxidation, the aliphatic C−H components were attacked by oxygen molecules and reacted with them. The asymmetric methyl and methylene groups were more likely to oxidize and produce carbonyl compounds. With the increase of nitrogen injection, the overall width of the oxidation zone (oxygen concentration was defined as 10−18%) narrowed, and the range of the oxidation zone moved forward from the depth of the goaf. The oxygen concentration in the air return corner decreased gradually, and the low-oxygen area in the air return corner expanded gradually. The distance between the lowoxygen area of the working face and the air intake corner was gradually shortened. With the increase of air intake, the width of the oxidation zone increased and moved to the depth of goaf, and the degree of low oxygen in the air return corner increased. The research results are of great significance for the understanding and prevention of the low-oxygen phenomenon in ultrathick coal seams.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on the Low-Temperature Oxygen Consumption and Low-Oxygen Gas Emission Law in Goaf of Ultrathick Coal Seams

Zheng,

Liu,

Liu

et al. 2024

ACS Omega

Self Cite

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show abstract

“…In the treatment of mine fire, techniques such as yellow mud injection, inert gas injection, and loess covering are generally adopted. − With the development of science and technology, mine fire prevention and control technology continue to progress. Such as three-phase foam as the representative of the foam class fire prevention materials, as well as the colloid as the representative of the colloid fire prevention materials gradually into the field of vision, the field application effect is remarkable. , Regarding research on coal pillars, most scholars at home and abroad focus on the mechanical characteristics and fragmentation mechanism of coal pillars. − However, it is worth noting that coal pillar cracks, under the influence of underground formation pressure, would further develop and result in a large number of air leakage channels.…”

Section: Introductionmentioning

confidence: 99%

Research on the Law of Coal Pillar Spontaneous Combustion and Fire Prevention and Control Technology

Liu,

Qi,

Luo

et al. 2024

ACS Omega

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In coal pillar fires, the fire source is hard to be detected and the adjacent goaf is extremely likely to be affected. Such fires would give rise to thermal and dynamic disasters in mines, further causing casualties and environmental disruption. In this study, with the coal pillar spontaneous combustion (CPSC) accident in Chahasu Coal Mine taken as the research object, the oxygen uptake and limit of oxygen concentration of CPSC were explored. Based on the research results, a similar model was constructed, where a control group was used to simulate the hazardous area of CPSC in a bid to investigate the law of CPSC. Moreover, the polymer colloid perfusion system was constructed and the drilling parameters and perfusion process parameters were determined, and practices concerning spontaneous fire control were carried out. Here are the conclusions: First, air leakage in the coal pillar may lead to coal spontaneous combustion due to the impact of rib spalling, threatening 2−6 m above the middle of the coal pillar at a shallow position. Second, coal pillar grouting, injecting polymer colloids for cooling, and coal pillar cement reinforcement prove to be effective ways to prevent CPSC fires and combat recombustion.

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“…Sun et al [19] and Li et al [20] analyzed the results of wind speed and air flow in the tail lane on spontaneously burned in goafs. Reducing the negative pressure of the tail roadway during the air capacity, when the working face is high, may help prevent gas in the return air roadway from exceeding the limit and significantly lower the hazard of spontaneous combustion of floated coal [21][22][23][24] The explosive density range and explosion danger of CH 4 and CO mixtures-the primary gases of coal spontaneous combustion-were experimentally explored. After a large amount of CO is mixed into the CH 4 , the explosive focus of the mixed gas's top and lower limit range is significantly expanded.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Evolution of Gas and Coal Spontaneously Burned Composite Disaster in the Goaf of Steeply Inclined Coal Seam

Feng

Xue-bo

et al. 2023

Sustainability

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As the coal mine gets deeper and the stopes’ structures become more complex, gas and coal spontaneously burned composite disaster seriously threatens the efficient operation of coal mines. To study the interaction process and disaster-causing mechanism of gas and coal spontaneous combustion (GCSC), this paper establishes a numerical model to study the influence of drilling location/pressure and N2 injection on the evolution of gas and coal spontaneously burned composite disaster in the goaf. The simulation shows that in the central part of the goaf, a combined area of gas and coal combustion poses a possibility of spontaneous combustion calamity, and the length of the compound disaster area is about 20 m. The methane (CH4) explosion zone and the dioxygen(O2) temperature rise zone do not overlap in the air entrance roadway and return air roadway, indicating that there is no risk of compound disasters. The optimal nitrogen (N2) injection rate for this working face is 2000 m3/h, and the N2 port should be located 25 m profound into the goaf, which can effectively drive the diffusion of N2 and narrow the O2 zone’s breadth. The findings have considerable engineering applications for revealing the evolution process, risk assessment and control for GCSC compound disasters in coal mines.

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Improved computational fluid dynamics modelling of coal spontaneous combustion control and gas management

Cited by 27 publications

References 46 publications

Research on the Low-Temperature Oxygen Consumption and Low-Oxygen Gas Emission Law in Goaf of Ultrathick Coal Seams

Research on the Low-Temperature Oxygen Consumption and Low-Oxygen Gas Emission Law in Goaf of Ultrathick Coal Seams

Research on the Law of Coal Pillar Spontaneous Combustion and Fire Prevention and Control Technology

Numerical Investigation of the Evolution of Gas and Coal Spontaneously Burned Composite Disaster in the Goaf of Steeply Inclined Coal Seam

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