煤质指标对煤尘云最低着火温度影响研究

为研究不同煤质煤尘的着火性能,首先,选取不同矿区9种煤样,分析其水分、挥发分、灰分、固定碳煤等工业成分;然后开展煤尘云最低着火温度试验;最后,对工业分析指标和煤尘云最低着火温度进行统计学和灰色关联分析。结果表明:煤样的最低着火温度介于405~515℃,着火温度值差异较大;煤的工业分析指标均与最低着火温度呈现出较强相关性:挥发分和固定碳含量与最低着火温度负相关,灰分和水分含量与最低着火温度呈正相关,即挥发分含量、固定碳含量越高,煤尘越易出现着火现象,灰分含量、水分含量越高,煤尘越不易着火;挥发分含量与最低着火温度关联度最大。

Influence of coal metamorphism on minimum ignition temperature of coal dust clouds

In order to study combustion characteristics of coal dust of different metamorphism,9 kinds of coal samples from various mines were selected and their industrial components such as moisture,volatiles,ash and fixed carbon were analyzed.Secondly,minimum ignition temperature experiments of coal dust clouds were performed.Finally,statistical and gray correlation analysis was conducted between industrial analysis index and minimum ignition temperature.The results show that the minimum ignition temperature differ sharply,varying from 405 to 515℃,and it is strongly correlated with industrial analysis index.Volatile and fixed carbon content are negatively correlated with it while ash and moisture content positively correlated with it.In other words,The higher volatile and fixed carbon content,the more likely coal dust is to catch fire,and the higher ash and moisture content,the more unlikely coal dust is to ignite.In addition,volatile content is mostly linked to minimum ignition temperature.