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    Investigation of spontaneous combustion of coal in a longwall panel
    (International Pittsburgh Coal Conference, 2014) Ozdeniz, Hadi; Sivrikaya, Osman; Berberoglu, Sezgin
    Spontaneous combustion of coal is pretty important especially for underground collieries for safety of workers and equipment. The temperature of colliery air increases due to some reasons during coal production and the main reason is oxidation of coal. Coal reacts with oxygen during production and is subject to spontaneous combustion. Coal oxidation is an exothermic reaction and coal generates heat in colliery atmosphere. If the heat is not removed from the colliery air, spontaneous combustion may start and then turn into combustion. In addition, explosive, flammable and toxic gases are other potential risks for safety in underground collieries. Those are not desired and cause problems. In order to avoid those problems, a proper mining method should be applied with a good ventilation system. If the problem cannot be solved, the longwall panel must be packed to prevent oxidation of coal. In this study, the temperatures changes of a longwall panel were monitored by a temperature sensor to predict spontaneous combustion. In addition, the temperature of the fresh air entering the longwall panel, exhaust air leaving the longwall panel and concentration of colliery gases (CO, CH4, O2 and CO2) were monitored. Graham's ratios were then calculated and used to predict of spontaneous combustion. When the temperature of the longwall panel and CO concentration were greater than the average values, the longwall panel was packed. In time, temperature of longwall panel started to decrease continuously after packing.