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利用热显微镜和摄像系统,研究了气氛、煤粉粒径、氧气流量和氧气浓度对超细煤粉在O2/CO2气氛中的着火特性的影响。试验表明煤粉在N2/O2中比在CO2/O2更容易着火,颗粒粒径在20μm及以下的煤粉着火温度及过程差别不大,挥发分析出比较平稳,而颗粒粒径较大的煤粉着火温度稍高。在纯氧中,氧气流量在大于一定值(200mL/min)后对着火影响不大。O2/CO2气氛中氧气浓度对煤粉着火影响较大,随着氧气浓度的降低,煤粉着火方式从均相着火变成非均相着火;且氧气浓度越低,着火越困难。
The effect of atmosphere, pulverized coal particle size, oxygen flow rate and oxygen concentration on the ignition characteristics of ultrafine pulverized coal in O2 / CO2 atmosphere was studied by using thermal microscope and camera system. The results show that the pulverized coal is easier to ignite in N2 / O2 than CO2 / O2. The ignition temperature and process of pulverized coal with particle size of 20μm and below are not different, and the volatilization is relatively stable. However, coal with larger particle size Powder ignition temperature slightly higher. In pure oxygen, oxygen flow greater than a certain value (200mL / min) after the fire had little effect. The oxygen concentration in O2 / CO2 atmosphere has a great influence on the ignition of coal. With the decrease of oxygen concentration, the ignition mode of coal powder changes from homogeneous ignition to heterogeneous ignition; and the lower the oxygen concentration, the more difficult it is to fire.