Early prevention and control of coal spontaneous combustion have emerged as a critical research area in coal mine safety.Due to their sustainability and environmental friendliness,microorganisms have gained attention....Early prevention and control of coal spontaneous combustion have emerged as a critical research area in coal mine safety.Due to their sustainability and environmental friendliness,microorganisms have gained attention.A filamentous fungus was collected in the coal mine and identified as Absidia spinosa.Results indicated that the mycelium effectively covered and repaired many coal pores.The oxygen consumption ratio of A.spinosa was higher in coal-containing environments than in coal-free conditions.The fungus significantly impacted aliphatic functional groups,disrupting bridging bonds and side chains connected to aromatic structures and reducing the relative content of C—O bonds.Additionally,A.spinosa increases the ignition temperature by 25.34℃.The total heat release was decreased by approximately 32.58%,and the activation energies were increased.The genome of Absidia spinosa revealed genes related to oxygen consumption,small molecule degradation,and secretion of metabolic products,such as those annotated under GO ID:0140657,etc.The pathways involved in the degradation of small organic molecules(e.g.,ko00626,etc.),carbon fixation,and nitrogen cycling,all linked to coal decomposition.Through oxygen consumption and the alteration of coal-active structures,A.spinosa effectively inhibits CSC,providing an experimental basis for exploring eco-friendly biological control methods in the goaf.展开更多
为了系统探讨煤自燃倾向性的影响因素,基于逐步回归分析方法,提出以煤样的工业分析参数、孔隙结构参数、官能团含量和燃烧活化能为自变量,燃点温度为因变量预测煤自燃模型,揭示煤自燃特性与微观结构间的关联。结果表明:6个煤样的孔隙分...为了系统探讨煤自燃倾向性的影响因素,基于逐步回归分析方法,提出以煤样的工业分析参数、孔隙结构参数、官能团含量和燃烧活化能为自变量,燃点温度为因变量预测煤自燃模型,揭示煤自燃特性与微观结构间的关联。结果表明:6个煤样的孔隙分形维数平均值为2.770,孔隙结构较为复杂,煤氧反应时可以提供更多的吸附位点;XL3的燃点温度最低为486℃,燃烧活化能也最低,为82.01 k J/mol;燃点温度y=381.152-1.494S_(BET)+21.550I_(C-O),R^(2)=0.998,表明了BET比表面积和C—O峰强度可以解释燃点温度99.8%变化的原因,且C—O峰强度对燃点温度的影响更为显著。研究结果揭示了煤体孔隙比表面积与含氧官能团是控制自燃倾向性的核心因素,为煤自燃风险评估提供了理论依据。展开更多
基金supported by the National Natural Science Foundation of China(No.51974128)the National Key Research and Development Program of China(No.2023YFC3009105)。
文摘Early prevention and control of coal spontaneous combustion have emerged as a critical research area in coal mine safety.Due to their sustainability and environmental friendliness,microorganisms have gained attention.A filamentous fungus was collected in the coal mine and identified as Absidia spinosa.Results indicated that the mycelium effectively covered and repaired many coal pores.The oxygen consumption ratio of A.spinosa was higher in coal-containing environments than in coal-free conditions.The fungus significantly impacted aliphatic functional groups,disrupting bridging bonds and side chains connected to aromatic structures and reducing the relative content of C—O bonds.Additionally,A.spinosa increases the ignition temperature by 25.34℃.The total heat release was decreased by approximately 32.58%,and the activation energies were increased.The genome of Absidia spinosa revealed genes related to oxygen consumption,small molecule degradation,and secretion of metabolic products,such as those annotated under GO ID:0140657,etc.The pathways involved in the degradation of small organic molecules(e.g.,ko00626,etc.),carbon fixation,and nitrogen cycling,all linked to coal decomposition.Through oxygen consumption and the alteration of coal-active structures,A.spinosa effectively inhibits CSC,providing an experimental basis for exploring eco-friendly biological control methods in the goaf.
文摘为了系统探讨煤自燃倾向性的影响因素,基于逐步回归分析方法,提出以煤样的工业分析参数、孔隙结构参数、官能团含量和燃烧活化能为自变量,燃点温度为因变量预测煤自燃模型,揭示煤自燃特性与微观结构间的关联。结果表明:6个煤样的孔隙分形维数平均值为2.770,孔隙结构较为复杂,煤氧反应时可以提供更多的吸附位点;XL3的燃点温度最低为486℃,燃烧活化能也最低,为82.01 k J/mol;燃点温度y=381.152-1.494S_(BET)+21.550I_(C-O),R^(2)=0.998,表明了BET比表面积和C—O峰强度可以解释燃点温度99.8%变化的原因,且C—O峰强度对燃点温度的影响更为显著。研究结果揭示了煤体孔隙比表面积与含氧官能团是控制自燃倾向性的核心因素,为煤自燃风险评估提供了理论依据。
