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为有效防治煤炭自燃,预测煤体最短自然发火期是非常必要的.以绝热圆柱形煤柱为物理模型,建立了煤实验最短自然发火期预测模型,利用实测的煤自燃基本参数,通过解算分析了漏风速度、粒度等参数对煤自然发火期的影响规律,最终准确测试了6个矿井不同煤体的实验最短自然发火期.结果表明:随漏风速度的增大,煤自然发火期先减小后增大;煤体粒度越小,最佳风速呈线性增大;随煤体粒度的增大,最佳风速条件下的自然发火期先减小后增大;煤体自燃倾向性越高,最短自然发火期越短;以张集肥煤为例,自然发火的最佳粒度为1～3mm,最佳漏风速度为0.001 1m/s,其实验最短自然发火期为26d.
In order to effectively prevent and treat spontaneous combustion of coal, it is very necessary to predict the shortest spontaneous combustion period of coal.Based on the physical model of adiabatic cylindrical coal pillar, the prediction model of the shortest spontaneous combustion period of coal experiment is established. By using the measured basic parameters of coal spontaneous combustion, The influence of air leakage velocity and particle size on the spontaneous combustion period of coal was analyzed, and finally the shortest spontaneous combustion period of different coal bodies in six mines was tested accurately.The results showed that with the increase of air leakage velocity, the spontaneous combustion period of coal decreased first Small and then increased; the smaller the coal particle size, the optimum wind speed increased linearly; with the increase of coal particle size, the spontaneous combustion propensity at the best wind speed first decreased and then increased; , The shortest spontaneous combustion period is shorter. Taking Zhangji fat coal as an example, the optimum particle size of spontaneous combustion is 1 ~ 3mm, the best air leakage rate is 0.001 1m / s, and the shortest spontaneous combustion period is 26 days.