Experimental study on influence of water content on secondary oxidation and spontaneous combustion characteristics of residual coal in goaf
Zuo Qiuling
Chen Xinkun
Yang Pengfei
Li Jingshan
Li Minrui
Li Yake
Tian Yifan
Li Hongchao
Abstract：The presence of old goaf water has led to the long-term immersion of residual coal in goafs in many domestic mining regions.It undoubtedly alters the spontaneous combustion patterns of the residual coal.It is necessary to study the changes in the secondary oxi-dation and spontaneous combustion characteristics of residual coal in goaf caused by different moisture contents.Considering that the spontaneous combustion point of coal is 80℃,the pre-oxidation temperature was set to 85℃,and the coal sample was pre oxidation treatment.Next,the coal sample was processed into a water containing coal sample,with three different water contents(3%,5%,and 7%)set.Then,coal spontaneous combustion tests were conducted on the water containing coal samples.Using the correspondence be-tween moisture content and gas concentration generated during coal sample spontaneous combustion,the relationship between moisture content and coal oxidation spontaneous combustion process was explained.The research results indicate that more than 5%moisture can make coal more easily oxidized,thereby positively promoting the process of coal oxygen composite reaction.Within a certain range of moisture content,coal samples with higher moisture content produce gas earlier and at a faster rate.Coal samples with higher moisture content are more prone to spontaneous combustion than those with lower moisture content.The research results provide theoretical basis for the prevention and control of spontaneous combustion of residual coal in goaf after immersion in water.
Keywords：moisture contentsecondary oxidationspontaneous combustion characteristicsgoafresidual coal
Publication Date：2025-06-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 65-69 )