煤尘爆炸特征参数影响因素研究

Research of influence factors on characteristic parameters of coal dust explosion

采用20 L球形爆炸装置研究了煤尘粒径、浓度、点火能量对煤尘爆炸最大压力、爆炸最大压力上升速率的影响。研究结果表明，在煤尘粒径一定的条件下，随着煤尘浓度的增大，爆炸最大压力及爆炸最大压力上升速率先增大后减小，煤尘浓度在400～480 g/m3之间取得爆炸最大压力最大值0.94 MPa、爆炸最大压力上升速率最大值28.79 MPa/s；在煤尘浓度一定的条件下，爆炸最大压力不随煤尘粒径的减小而单调变化，爆炸最大压力上升速率随煤尘粒径的减小而逐渐增大；随着点火能量的增大，爆炸最大压力及爆炸最大压力上升速率明显增加。

Influence of particle size,concentration and ignition energy of coal dust on the maximum pressure and its rising rate of coal dust explosion were researched by use of 20Lspherical explosion equipment.The research results show that under the condition of certain particle size of coal dust,the maximum pressure and its rising rate of coal dust explosion will increase firstly and then decrease along with increasing of concentration of coal dust.When concentration of coal dust is in 400-480g/m3,the maximum pressure and its rising rate of coal dust explosion achieve the maximal value of 0.94MPa and maximum 28.79 MPa/s respectively.Under the condition of certain concentration of coal dust,the maximum pressure of coal dust explosion will not change in a similar tendency and its rising rate will increase along monotone with decreasing of particle size of coal dust.The maximum pressure and its rising rate of coal dust explosion will increase significantly along with increasing of ignition energy.