Study on the influence of advancing speed on the dynamic distribution laws of spontaneous combustion hazard zones and high-temperature points in goaf areas

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2024-11-21 DOI:10.1016/j.ijthermalsci.2024.109559

Xin Luo , Mingyun Tang , Shiqiang Gao , Liang Zhou , Jian Wang , Dayong Luo , Ruiqin Zhang

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引用次数: 0

Abstract

Spontaneous combustion of coal occurs when arising from a combination of factors, including oxidation and heating of residual coal in goaf and favorable heat retention conditions, and the spontaneous combustion hazard zones and high-temperature points formed exhibit dynamic, concealed, and three-dimensional characteristics, further complicating the on-site prevention and control of coal spontaneous combustion. Therefore, it is particularly important to study the dynamic evolution of coal spontaneous combustion (CSC) hazard areas in the goaf during the working face advancement process. With 010803 working face of Wang Wa Coal Mine for reference, the paper develops a three-dimensional Multiphysics coupling model of the goaf through field tests, laboratory experiments, and numerical simulations. For the first time, three-dimensional dynamic mesh technology is employed to investigate the spatial dynamic variation laws of spontaneous combustion hazard zones in goaf areas under advancing speeds ranging from 2 to 8 m/day. The results indicate that the relative error between simulated leakage airflow and field measurements is 1.4 %. As the advancing speed of the working face increases, the oxidation zone in the goaf shifts deeper, and its area increases linearly, though the rate of increase gradually decreases. With higher advancing speeds, the temperature of the high-temperature points in the goaf decreases, and the distances of these points from the lower corner of the working face grow exponentially in both strike and dip directions. However, the high-temperature points remain within the oxidation zone, with their strike migration ranging from 86.3 to 149 m and dip migration from 44 to 51 m. Based on this analysis, a spatial distribution function for high-temperature points in goaf areas is proposed. This study provides theoretical support for preventing and controlling coal spontaneous combustion in goaf areas.

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推进速度对羊群地区自燃危险区和高温点动态分布规律的影响研究

煤炭自燃是由煤层中残留煤炭的氧化发热和有利的保温条件等综合因素引起的，形成的自燃危险区和高温点具有动态性、隐蔽性和立体性等特点，使煤炭自燃的现场防治工作更加复杂。因此，研究工作面推进过程中巷道内煤炭自燃危险区的动态演化尤为重要。本文以王洼煤矿 010803 工作面为参考，通过现场试验、实验室实验和数值模拟，建立了煤层的三维多物理场耦合模型。首次采用三维动态网格技术，研究了2-8米/天推进速度下羊草区自燃危险区的空间动态变化规律。结果表明，模拟泄漏气流与实地测量值的相对误差为 1.4%。随着工作面推进速度的增加，羊群中的氧化区向纵深移动，其面积呈线性增加，但增加速度逐渐减小。随着推进速度的提高，岩棉层中高温点的温度降低，这些点与工作面下角的距离在走向和倾角方向上都呈指数增长。然而，高温点仍在氧化区内，其走向迁移范围为 86.3 米至 149 米，倾角迁移范围为 44 米至 51 米。根据这一分析，提出了煤层区高温点的空间分布函数。该研究为防治煤田煤炭自燃提供了理论支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.