煤特征放热强度的实验研究

通过煤自燃程序升温实验，测定出煤体的耗氧速度、CO和CO2的产生率，采用键能平衡法推算煤体的最大和最小放热强度，并通过与相关大型煤自然发火实验结果的关联分析，建立了煤体实际放热强度与最大和最小放热强度的函数关系，提出了表征煤体低温氧化放热性且仅与煤体破碎程度和氧气浓度有关的综合指标——特征放热强度.然后根据不同粒度和入口氧气浓度不同条件下程序升温实验的结果分析，得出表征煤体自燃性的强弱——煤体特征放热强度与粒度和入口氧气浓度的实验关系式，从而为定量判定不同条件下煤体自燃性的大小提供理论依据.

Experiment study of characteristic self-heating intensity of coal

Through programmed heating experiments, oxygen consumption rate, CO and CO2 generation rate on different temperature were tested, and upper and lower limits of self-heating intensity of coal can be calculated with these experimental data by means of bond energy method. Through large-scale coal spontaneous combustion experiment self-heating intensity on different temperature were also obtained. Correlative function between the real selfheating intensity and its upper and lower values were set up through correlation analysis. A comprehensive index refleeting self-heating property of coal differs with oxygen concentration and particle size of coal was put forward. In the end, based on programmed heating test of coal under the conditions of different coal particle size and supply oxygen flow velocity, empirical function between characteristic self-heating intensity and particle size of coal and oxygen concentration were set up, which provide theoretical basis to determine spontaneous combustion propensity of coal on different conditions quantitatively.