煤尘爆炸残留物特征影响因素研究

Study on influencing factors of coal dust explosion residues character

为了研究煤尘浓度、煤尘粒径以及点火能量对煤尘爆炸后气、固态残留物组分特征的影响,利用20L球形爆炸装置测试系统进行了煤尘爆炸实验,并对爆炸残留物进行了收集与分析。研究结果表明:随着煤尘浓度的增加,气态残留物中CO、H_2、CH_4、C_2H_4、C_2H_6及C_3H_8的体积分数逐渐增大,而CO_2先增大后减小,固态残留物挥发分与固定碳含量逐渐增加,灰分含量逐渐减少;煤尘浓度为100g/m^3时,粒径48~75μm的煤尘爆炸残留气体中CO、CO_2、H_2、CH_4等气体的体积分数达到最大值,煤尘浓度为400g/m^3时,CO、CO_2、H_2、CH_4等气体的体积分数随着煤尘粒径的减小而增大,固态残留物挥发分含量随煤尘粒径减小而逐渐减小,灰分含量逐渐增大;随着点火能量增大,气态残留物中CO、H_2、CH_4、C_2H_6、C_3H_8逐渐升高,固态残留物挥发分与固定碳含量逐渐减小,而灰分含量不断增大。

To study the influence of coal dust concentration,particle size and ignition energy on coal dust explosion gas and solid residue composition characteristics, coal dust explosion experiment was carried out using a 20 L spherical explosive device, the residues were collected and analyzed. Research shows that, with the increase of coal dust concentration,CO,H2,CH4,C2H4,C2H6 and C3H8 volume fraction increases,CO2 first increases then decreases,solid residues volatile and fixed carbon content increase,the ash content reduce. When coal dust concentration is 100 g /m^3,the particle size of 48 ～ 75μm coal dust explosion residual gas CO,CO2,H2 and CH4volume fraction reaches maximum,when coal dust concentration is 400 g / m3,CO,CO2,H2,CH4 volume fraction increase with the decrease of coal dust particle size,solid residues volatile content decreases with the decrease of the coal particle size,ash content increases gradually. Increasing the ignition energy, gas residue of CO, H2,CH4,C2H6 and C3H8increases, solid residues volatile and fixed carbon content decrease,while the ash content keeps increasing.