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本文介绍了二维轴对称煤粉气流火炬点火的试验和理论研究结果。点火源为氧—乙炔火炬。试验煤种为劣质烟煤、贫煤和无烟煤。结果表明,在用火炬引燃煤粉气流时,存在一个对应于最低煤粉浓度的最佳点燃流速,其值随煤粉气流初始温度的升高而增加。文中提出了二维轴对称煤粉气流火炬点火的理论模型,用“直线法”作了数值计算。计算值与试验结果符合较好。利用该模型,还预测了点火源温度、煤粉粒径以及煤中挥发份含量对煤粉气流火炬点火的影响。
This paper introduces the experimental and theoretical research results of the two-dimensional axisymmetric pulverized coal current torch ignition. Ignition source of oxygen - acetylene torch. Test coal is poor quality bituminous coal, lean coal and anthracite. The results show that there is an optimum ignition flow rate corresponding to the lowest pulverized coal concentration when the pulverized coal gas stream is ignited by a torch and its value increases with the initial temperature of the pulverized coal flow. In this paper, a theoretical model of two-dimensional axisymmetric pulverized coal gas torch ignition is proposed, which is calculated by “straight line method”. The calculated value is in good agreement with the test result. Using this model, the effects of ignition source temperature, pulverized coal particle size and volatile content in coal on the ignition of pulverized coal airstream were also predicted.