Effect of Secondary Oxidation of Pre-Oxidized Coal on Early Warning Value for Spontaneous Combustion of Coal

The indicative ability of a gas indicator for the spontaneous combustion coal is affected by secondary oxidation oxidized coal, from old goafs, entering new goaf through air leakages. This phenomenon can affect accuracy early warning systems regarding in goaf. In this research, three kinds were selected to carry out simulation experiment which temperature-programmed experimental device was used analyze behavior index towards raw and latter at 70 °C, 90 130 150 °C. results show that chain alkane ratio process trends oxygen, CO, C2H4 concentrations are same as those primary process. On other hand, temperature initially appears, during oxidation, lower than oxidation. CO produced stage greater produced, temperature, regard, usage concentration an with judge occurrence would allow earlier response. process, extreme value alkene appears higher presence pre-oxidation proportion will indicator’s judgement when enters severe stage. mine goaf, should be considered establishment system.