353 / 2018-05-30 10:25:22

Effectiveness of high-temperature-programmed experimental system in simulating spontaneous combustion properties of hazardous gas emission by bituminous coal

Characteristic temperatures,Temperature-programmed,Gaseous generation,Oxygen consumption rate,Analytic growth rate method

矿山职业健康与环境安全 > 防火

Reactants’ particle size can affect combustion risk. In the process of mining, coal is crushed into particles of various sizes. To explore the influence of particle size on hazardous gas emission during high temperature oxidation of coal, a self-designed high-temperature-programmed experimental system was developed. This study adopted the new system and three coal samples from Huainan, Anhui Province, China to examine gaseous generation—including carbon monoxide, carbon dioxide, alkane, and alkene concentration—under six different particle sizes and from 30 to 500 °C. Moreover, oxygen consumption rate and characteristic temperatures are essential factors and have decisive effects during the spontaneous combustion of coal. Thus, the oxygen consumption rate was captured using the oxygen concentration, and indicator gas growth rate method was used to calculate the characteristic temperatures. The five characteristic temperatures obtained for the six particle sizes were the critical, crack, active, speed up, and ignition temperatures.