多热源条件下采空区煤自燃CO分布规律研究
Research on the Distribution Law of Coal Spontaneous Combustion CO in Goaf under the Condition of Multiple Heat Sources
DOI: 10.12677/ME.2024.121010, PDF,  被引量    国家自然科学基金支持
作者: 朱成军, 叶 青, 丁文学, 滕洋洲, 刘 暾：湖南科技大学，资源环境与安全工程学院，湖南 湘潭
关键词: 煤自燃；CO；多热源；采空区漏风；数值模拟；Coal Spontaneous Combustion； CO； Multiple Heat Sources； Air Leakage in Goaf； Numerical Simulation
摘要: 为了研究多热源条件下采空区煤自燃CO浓度场分布规律，结合煤自燃特性和采空区孔隙率分布规律，建立采空区煤自燃升温产气多场耦合模拟模型，采用FLUENT软件模拟在采空区回风侧多热源数量煤自燃升温产气变化过程，对不同条件下采空区CO浓度场分布情况进行研究，探究多热源条件下采空区煤自燃CO浓度场耦合变化规律。模拟结果表明：采空区煤自燃CO浓度随着热源数量增多而增大。采空区单一热源条件下煤自燃CO气体分布主要向回风侧扩散，距离采空区工作面越远采空区CO气体浓度越高。对比发现双热源和三热源条件下，热源之间煤自燃CO气体扩散相互影响，双热源和三热源条件下CO分布具有相似的耦合规律，在热源温度和采空区漏风作用影响下，采空区CO浓度分布随着温度升高具有阶段性变化，由于不同热源之间煤自燃存在相互耦合扩散作用，采空区CO浓度场呈现出“弱–强–弱–强”的耦合变化特征。综上所述，多热源会使采空区煤自燃CO扩散规律变的更加复杂，且对煤自燃具有促进作用。
Abstract: In order to study the distribution law of CO concentration field of coal spontaneous combustion in goaf under multi-heat source conditions, combined with the characteristics of coal spontaneous combustion and the distribution law of porosity in goaf, a multi-field coupling simulation model of coal spontaneous combustion temperature rise and gas production in goaf is established. FLUENT software is used to simulate the change process of coal spontaneous combustion temperature rise and gas production in the number of multi-heat sources on the return air side of goaf. The distri-bution of CO concentration field in goaf under different conditions is studied, and the coupling variation law of CO concentration field of coal spontaneous combustion in goaf under multi-heat source conditions is explored. The simulation results show that the CO concentration of coal spon-taneous combustion in goaf increases with the increase of the number of heat sources. Under the condition of single heat source in goaf, the distribution of CO gas in coal spontaneous combustion mainly diffuses to the return air side, and the farther away from the working face in goaf, the higher the concentration of CO gas in goaf. It is found that under the conditions of double heat source and three heat sources, the diffusion of CO gas in coal spontaneous combustion between heat sources affects each other, and the distribution of CO under the conditions of double heat source and three heat sources has similar coupling rules. Under the influence of heat source temperature and air leakage in goaf, the distribution of CO concentration in goaf changes periodically with the increase of temperature. Due to the mutual coupling and diffusion of coal spontaneous combustion between different heat sources, the CO concentration field in goaf shows the coupling variation characteristics of “weak-strong-weak-strong”. In summary, multi-heat sources will make the CO diffusion law of coal spontaneous combustion in goaf more complicated and promote coal spontaneous combustion.
文章引用：朱成军, 叶青, 丁文学, 滕洋洲, 刘暾. 多热源条件下采空区煤自燃CO分布规律研究[J]. 矿山工程, 2024, 12(1): 92-102. https://doi.org/10.12677/ME.2024.121010

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