Abstract The knowledge of the behavior of coal undergoing oxidation under various conditions is important for the prevention and control of mine fires. The aim of the work was to investigate carbon oxides, ethane, propane, propylene and ethylene emissions from coal oxidation using an air stream of varying oxygen content. The experiment included the heating of coal in the temperature range of 30–210 °C at atmosphere that contains 10%, 15% and 21% oxygen. The results showed that oxygen enrichment in the atmosphere increases the chemical activity of coal and the amount of gases produced due to reaction. At the temperature of 90 °C, the reduction of the oxygen amount by half resulted in the decrease in outflow gases concentration by two times, while at the temperature of 130 °C by three times. The measurements confirmed the existence of a critical temperature (in the range of 80–90 °C) defined as the temperature above which the coal temperature and the amount of released gases increase rapidly. Coal sample heating was also tested at air flow rates of 0.05 L/min and 0.1 L/min, at the temperatures of 90 °C and 120 °C.

中文翻译：

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用不同氧含量和流速的空气流氧化煤 - 火气排放剖面

摘要 了解煤在不同条件下氧化的行为对于预防和控制矿井火灾具有重要意义。这项工作的目的是研究使用不同氧含量的空气流进行煤氧化所产生的碳氧化物、乙烷、丙烷、丙烯和乙烯的排放。该实验包括在含有 10%、15% 和 21% 氧气的大气中，在 30-210 °C 的温度范围内加热煤。结果表明，大气中富氧会增加煤的化学活性和反应产生的气体量。在90°C的温度下，氧气量减少一半导致流出气体浓度减少两倍，而在130°C的温度下则减少三倍。测量结果证实了临界温度（在 80-90 °C 范围内）的存在，临界温度定义为煤温度和释放气体量迅速增加的温度。还在 0.05 L/min 和 0.1 L/min 的空气流速下，在 90 °C 和 120 °C 的温度下测试了煤样加热。