Yu Jiaqi, Sha Di, Jin Zhixin, Deng Cunbao
College of Safety and Emergency Management, Taiyuan University of Technology, Taiyuan 030024, China.
ACS Omega. 2024 Mar 21;9(13):15428-15438. doi: 10.1021/acsomega.4c00057. eCollection 2024 Apr 2.
To study the effect of the inert gas mixture concentration and ratio on the spontaneous combustion reaction of gas coal, a combination of experimental research and theoretical analysis was used to study the pyrolysis and combustion kinetics characteristics of gas coal and further explore the influence of inert gas on the inerting characteristics of gas coal. Research has shown that during the entire heating reaction process of gas coal, the concentration of inert gases has little effect on the drying and desorption stages, but there is a significant lag phenomenon in the characteristic temperature points of active decomposition and degassing stages. Under the same concentration of mixed inert gases, the higher the relative percentage content of CO, the more significant the change and the better the inhibitory effect. The higher the volume fraction of the inert gas, the higher the cross-temperature point. In the late stage of rapid heating of coal samples, when the volume fraction of inert gas is 40%, the rate of temperature rise increases rapidly. In a pure air environment, CO begins to be released at 80 °C, and when the temperature rises to 130 ∼ 140 °C, the concentration of CO begins to rapidly increase. Under inert conditions, the higher the relative percentage content of inert gas is, the higher the temperature point at which CO is generated. When the experimental conditions are a mixture of 30% N and 10% CO as inert gas, the optimal inerting effect has been achieved. The research results provide a theoretical basis for determining the optimal ratio of inert gas inerting concentrations to achieve fire prevention and extinguishing.
为研究惰性气体混合浓度及比例对气煤自燃反应的影响，采用实验研究与理论分析相结合的方法，研究气煤的热解及燃烧动力学特性，并进一步探究惰性气体对气煤惰化特性的影响。研究表明，在气煤整个加热反应过程中，惰性气体浓度对干燥和解吸阶段影响较小，但在活性分解和脱气阶段的特征温度点存在明显滞后现象。在混合惰性气体浓度相同的情况下，CO相对百分含量越高，变化越显著，抑制效果越好。惰性气体体积分数越高，交叉温度点越高。在煤样快速加热后期，当惰性气体体积分数为40%时，升温速率迅速增加。在纯空气环境中，80℃开始释放CO，当温度升至130～140℃时，CO浓度开始迅速增加。在惰性条件下，惰性气体相对百分含量越高，CO生成的温度点越高。当实验条件为30%N和10%CO的混合气体作为惰性气体时，已达到最佳惰化效果。研究结果为确定实现防火灭火的惰性气体惰化浓度最佳比例提供了理论依据。
