Air Leakage Law and Prevention Technology of Coal Spontaneous Combustion in the Goaf of “Isolated Island” Fully Mechanized Caving Face

Ma, Li; Du, Su; He, Cheng-Mao; Guo, Ruizhi; Tao, W. Andy

doi:10.1080/00102202.2023.2175611

Cited by 4 publications

(3 citation statements)

References 30 publications

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“…Among them, underground perfusion of CO 2 is a very effective technology for the prevention and control of coal spontaneous combustion by diluting and reducing oxygen, absorbing heat and cooling and absorbing oxygen resistance. 9 However, because CO 2 is gaseous, air leakage is easy to occur in the underground goaf, 10 and the escaped CO 2 will enter the atmosphere with the wind flow, increasing the emission of CO 2 in the gas, which does not meet the national requirements of "carbon peak and carbon neutralization". If the CO 2 is sealed in the goaf for a long time, long-term effective prevention and control of coal spontaneous combustion can be achieved.…”

Section: Introductionmentioning

confidence: 99%

Research on the Mineralization and Carbon Fixation of Porous Gel Based on Carbide Slag-Triethylenetetramine

Hu,

Mao,

Zhang

et al. 2024

Energy Fuels

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Improving the rate of mineralization reaction in alkaline solid waste, primarily consisting of calcium carbide slag, is essential for mineralization plugging, fire prevention, and extinguishing. In this study, a novel method to synergistically enhance the mineralization reaction rate by adding catalytic CO 2 conversion substances and increasing the gas−solid contact area was proposed. A high-temperature and high-pressure reactor device was used for the test, and the effects of four factors on CO 2 conversion, namely triethylenetetramine (TETA) addition, CO 2 initial pressure, calcium oxide (CaO) addition, and reaction time, were tested by single-factor and response surface curve analysis. According to the influence of the absorption capacity, the optimal combination of the CO 2 adsorption capacity was screened out. Through the chemical composition and phase analysis of carbide slag before and after the carbonation reaction, it was observed that effective calcareous components existed in the forms of Ca(OH) 2 and CaCO 3 , verifying that carbide slag can effectively mineralize and store CO 2 gases. The mechanisms underlying TETA storage and CO 2 conversion were studied by density functional theory calculations. Furthermore, the TETA solution and carbide slag were compounded and foamed to prepare a threedimensional porous gel to study its influence on the mineralization efficiency of CO 2 . The results showed that the potential to fix CO 2 at different temperatures is 0.07 g/g CO 2 (20 °C), 0.077 g/g CO 2 (30 °C), and 0.110 g/g CO 2 (40 °C). The economic benefit analysis showed that the mineralization costs of 1 ton of CO 2 at different temperatures were about ¥15,642.39 (20 °C), ¥14,220.35 (30 °C), and ¥99544.25 (40 °C), respectively. More importantly, the porous gel was prepared using natural polymer materials and industrial solid waste, thus offering an environmentally compatible approach to provide a theoretical basis for the research and development of materials for preventing coal spontaneous combustion.

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Section: Introductionmentioning

confidence: 99%

Research on the Mineralization and Carbon Fixation of Porous Gel Based on Carbide Slag-Triethylenetetramine

Hu,

Mao,

Zhang

et al. 2024

Energy Fuels

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“…It is also revealed that air leakage microcirculation brings more airflow into the goaf, accelerating the spontaneous combustion of residual coal. This situation is particularly noticeable during the excavation process of narrow coal pillars. , As the conditions of the isolated island working face are more complicated, air leakage from the fragmented coal pillar can lead to the connection of multiple goafs in series, thus promoting the risk of spontaneous combustion in goafs …”

Section: Introductionmentioning

confidence: 99%

“…This situation is particularly noticeable during the excavation process of narrow coal pillars. 26,27 As the conditions of the isolated island working face are more complicated, air leakage from the fragmented coal pillar can lead to the connection of multiple goafs in series, thus promoting the risk of spontaneous combustion in goafs. 28 Aiming at the prevention and control of CPSC fires, coal reinforcement and roadway grouting are frequently used.…”

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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Compound disaster characteristics of rock burst and coal spontaneous combustion in island mining face: A case study

Liu,

Zhou,

Zhang

et al. 2024

Case Studies in Thermal Engineering

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Air Leakage Law and Prevention Technology of Coal Spontaneous Combustion in the Goaf of “Isolated Island” Fully Mechanized Caving Face

Cited by 4 publications

References 30 publications

Research on the Mineralization and Carbon Fixation of Porous Gel Based on Carbide Slag-Triethylenetetramine

Research on the Mineralization and Carbon Fixation of Porous Gel Based on Carbide Slag-Triethylenetetramine

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

Compound disaster characteristics of rock burst and coal spontaneous combustion in island mining face: A case study

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