煤油共生矿区含油煤尘云最低着火温度试验研究

为研究煤油共生矿区含油煤尘最低着火温度的变化规律，选取3种含油浓度不同的煤样，采用粉尘云最低着火温度测定系统，研究含油煤尘云最低着火温度随含油浓度、喷尘压力及煤尘质量的变化规律。研究结果表明:含油煤尘的最低着火温度较不含油煤尘显著降低，且随着煤尘含油浓度的增加，煤尘中挥发分含量增多，煤尘云最低着火温度降低，爆炸危险性增强；低含油浓度煤尘，煤尘受原油挥发分影响较大，在含油浓度为5.7%，4.3%且质量浓度为1364~4550 g/m3时煤尘云最低着火温度随喷尘压力的增大呈先增大后减小的变化趋势，在5.7%，4.3%含油浓度且喷尘压力为0.05 MPa时煤尘MIT随煤尘质量浓度增加先降低后缓慢升高。高含油浓度煤尘，受煤尘团聚现象影响较大，煤尘云最低着火温度随喷尘压力的增加而升高，随煤尘质量的增加呈先减小后增大再缓慢减小的变化规律。

Experimental study on minimum ignition temperature of oil-bearing coal dust cloud in coal-oil coexisting mining area

In order to study the variation laws of the minimum ignition temperature of oil-bearing coal dust in the coal-oil coexisting mining area,three types of coal samples with different oil-bearing concentrations were selected,and the variation laws of the minimum ignition temperature of oil-bearing coal dust cloud with the oil-bearing concentration,dust spraying pressure and coal dust mass were studied.The results showed that the minimum ignition temperature of oil-bearing coal dust was significantly lower than that of non-oil coal dust,and with the increase of oil-bearing concentration of coal dust,the volatile matter content in the coal dust increased,the minimum ignition temperature of coal dust cloud decreased,and the explosion risk increased.Low oil-bearing coal dust is greatly affected by the volatile matter of coal dust in coal dust. When the oil concentration is 5.7% and 4.3%with the mass concentration is 1364 g/m^3 to 4550 g/m^3, the minimum ignition temperature of coal dust cloud decreases with the increase of dust pressure, and decreases first with the increase of coal dust quality. High oil-bearing coal dust is greatly affected by the phenomenon of coal dust agglomeration. When the oil concentration is 5.7%, 4.3% and the dust pressure is 0.05 MPa, the minimum ignition temperature of coal dust cloud increases with the increase of dust pressure. The coal dust with high oil-bearing concentration was greatly affected by the phenomenon of coal dust agglomeration.The minimum ignition temperature of coal dust cloud increased with the increase of dust spraying pressure,while it decreased first and then increased and decreased slowly again with the increase of coal dust mass.