Influence of different content of FeS2 on spontaneous combustion characteristics of coal

Wang, Haiyan; Tan, Bo; Shao, Zhuangzhuang; Guo, Yan; Zhang, Zhaolun; Xu, Changfu

doi:10.1016/j.fuel.2020.119582

Cited by 55 publications

(26 citation statements)

References 23 publications

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“…A preliminary risk assessment index system is analyzed based on the current Code for Terrain Design, Code for Fire Prevention in Subway Design, Code for Design of Automatic Fire Alarm System, Comprehensive Ability of Fire Safety Technology, Code for Fire Prevention in Architectural Design, relevant fire codes for China and abroad, and the current domestic and foreign research literature [34]. On the basis of the preliminary establishment of the fire risk index system for the urban subway under consideration, a questionnaire survey is conducted to investigate the importance of the index, and the most important influencing factors are selected according to the grey theory.…”

Section: Development Of a Subway Fire Risk Evaluation Indexmentioning

confidence: 99%

Developing a Subway Fire Risk Assessment Model Based on Analysis Theory

Yan

Wang

2021

Mathematical Problems in Engineering

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In order to effectively reduce the risk of subway fires and to improve the safety of passengers, a review of the background to subway fires employing literature and comparative analyses, computer simulation, expert consultation, and other research methods has been employed to conduct an in-depth study of subway fire risk assessment and control measures. A subway fire risk assessment model based on analysis theory was established. Firstly, a subway fire risk evaluation index system was developed, and the weight values of each level were determined using the interval analytic hierarchy process (IAHP), then the evaluation was derived using the fuzzy evaluation method, and the passenger distribution simulation was introduced to improve the objectivity of the evaluation. The results show that the fire evaluation of this subway system is safe. The results show that a subway fire risk assessment model may provide a scientific basis for establishing prevention and control measures, extinguishing methods, passenger safety evacuation schemes, and carrying out fire safety management activities during subway operations.

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Section: Development Of a Subway Fire Risk Evaluation Indexmentioning

confidence: 99%

Developing a Subway Fire Risk Assessment Model Based on Analysis Theory

Yan

Wang

2021

Mathematical Problems in Engineering

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“…In the mining of coal resources in deep parts, the occurrence characteristics of high stress, gas pressure, gas content, and low permeability of coal seams become increasingly prominent. Moreover, gas pressure and content in outburst-prone coal seam groups rise, so that gas control in coal seams becomes more difficult [4][5][6][7]. is is contrary to the current high-efficient and fully mechanized mining degree and gas always restricts the safe and efficient mining of coal resources.…”

Section: Introductionmentioning

confidence: 99%

Evolution Characteristics of a High‐Level Asymmetric Fracture‐Seepage Community and Precise Coalbed Methane Drainage Technology during Mining of Outburst‐Prone Coal Seam Groups

Wang

Cheng

et al. 2021

Shock and Vibration

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The aim of this study is to explore the coupling relationship between fractures in overlying strata and gas seepage fields for pressure relief during mining of outburst-prone coal seam groups and to quantitatively characterize the distribution characteristics of favorable areas for coalbed methane (CBM) drainage in mining-induced fractures of overlying strata. For these purposes, by taking Shaqu No. 1 Coal Mine (Lvliang City, Shanxi Province, China) as a research object, this research studied migration and caving characteristics of overlying strata by combining physical similar material simulation, numerical simulation, and field measurement. Moreover, this study analyzed spatial distribution patterns of mining-induced fractures in overlaying strata, quantitatively characterized distribution parameters of asymmetric-oblique-quadrilateral fracture development zones in overlying strata, and precisely divided areas favorable for CBM drainage. On this basis, evolution laws of an asymmetric fracture-seepage community in overlying strata in outburst-prone coal seam groups were obtained, thus optimizing design parameters for directional drilling in the fracture zone in overlying strata. The research results demonstrate that, due to mining-induced influences, strata present different migration and rupture patterns along rupture lines on both sides. Because of different rupture angles α and β, mining-induced fractures in overlying strata are distributed as an asymmetric-oblique-quadrilateral fracture development body in space. Furthermore, based on the coupling relationship between fracture development states and pressure-relief gas seepage in the fracture development zone in overlying strata of the 4305 rear working face in the mine, this research obtained rupture angles α ∈ [74, 90) and ß ∈ (70, 82] on both sides of the fracture development zone. Moreover, the intervals favorable for CBM drainage for pressure relief on both sides of the fracture development zone in overlying strata of 4305 rear working face in the mine were separately determined as xaj ≤ 22.68 m and 24 m ≤ xβj ≤ 37.8 m. If the gas drainage system is designed in this zone, it is of great significance to precise and efficient pressure-relief CBM drainage in the fracture zone and ensure production safety in the mining space.

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“…However, the mining process is faced with production unsafety, especially coal mine gas disasters [1,2]. Coal mine gas drainage is an important measure to reduce mine gas emission and prevent spontaneous combustion in goaf [3][4][5][6], gas explosion, and gas outburst disasters [7][8][9]. In China, coal mine gas drainage efficiency is generally low, negative pressure is relatively low, the borehole drainage cycle is short, and the drainage effect is unsatisfying [10].…”

Section: Introductionmentioning

confidence: 99%

Research on Optimization of Key Areas of Drainage Borehole Sealing in Ultrathick Coal Seam

Guo

Xue

et al. 2021

Shock and Vibration

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Gas drainage is an important means of gas control. The influence of the key position of the sealing hole on gas drainage was studied by theoretical and numerical simulation combined with field measurement to solve low gas concentration in gas predrainage boreholes in coal mines of China. By analyzing the distribution of cracks around the boreholes and the law of air leakage and simulating the drainage effect of different sealing areas (8 m, 12 m, and 16 m), it was proposed that the key position of the sealing hole should be in the prepeak stress concentration area. According to the actual situation of Baode Mine, the sealing test scheme of different sealing areas was put forward, and the field test was carried out to obtain the key sealing area of gas predrainage boreholes in Baode Mine. Research shows that when the sealing area is 8–16 m, the average gas concentration is 63.57%, and the average pure gas flux is 0.408 m3/min. The sealing effect of this area is better, with fewer cracks, than that of the existing sealing area, effectively preventing gas leakage and increasing the gas concentration and gas scalar.

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Influence of different content of FeS2 on spontaneous combustion characteristics of coal

Cited by 55 publications

References 23 publications

Developing a Subway Fire Risk Assessment Model Based on Analysis Theory

Developing a Subway Fire Risk Assessment Model Based on Analysis Theory

Evolution Characteristics of a High‐Level Asymmetric Fracture‐Seepage Community and Precise Coalbed Methane Drainage Technology during Mining of Outburst‐Prone Coal Seam Groups

Research on Optimization of Key Areas of Drainage Borehole Sealing in Ultrathick Coal Seam

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