Spontaneous combustion liability between coal seams: A thermogravimetric study  

作　　者：Moshood Onifade Bekir Genc Samson Bada 

机构地区：[1]Department for Management of Science and Technology Development,Ton Duc Thang University,Ho Chi Minh City 700000,Viet Nam [2]Faculty of Applied Sciences,Ton Duc Thang University,Ho Chi Minh City 700000,Viet Nam [3]School of Mining Engineering,University of the Witwatersrand,Johannesburg 2050,South Africa [4]Clean Coal and Sustainable Energy Research Group,Faculty of Engineering and the Built Environment,University of the Witwatersrand,Johannesburg 2050,South Africa

出　　处：《International Journal of Mining Science and Technology》2020年第5期691-698,共8页矿业科学技术学报（英文版）

摘　　要：The spontaneous combustion liability of coal can be determined by using different experimental techniques.These techniques are well-known in their application,but no certain test method has become a standard to prove the reliability of all of them.A general characterisation which included proximate and ultimate analyses,petrographic properties and spontaneous combustion tests(thermogravimetric analysis(TGA)and the Wits-Ehac tests)were conducted on fourteen coal and four coal-shale samples.The spontaneous combustion liability of these samples collected between coal seams(above and below)were predicted using the TGA and the Wits-Ehac tests.Six different heating rates(3,6,9,15,20 and 25
C/min)were selected based on the deviation coefficient to obtain different derivative slopes and a liability index termed the TGspc index.This study found that coal and coal-shale undergo spontaneous combustion between coal seams when exposed to oxygen in the air.Their intrinsic properties and proneness towards spontaneous combustion differ considerably from one seam to the other.The Wits-Ehac test results agreed with the TGspc results to a certain extent and revealed the incidents of spontaneous combustion in the coal mines.

关 键 词：Crossing-point temperature Thermogravimetric analysis Wits-Ehac index TGspc index 

分 类 号：TD752.2[矿业工程—矿井通风与安全]