热板上煤尘着火及引燃煤粉尘云特性试验研究  

Study of ignition of coal dust deposit by hot plate and its capability to ignite coal dust clouds

作　　者：梁运涛 王泠峰 苑春苗[2] 田富超 王敬燕 LIANG Yuntao;WANG Lingfeng;YUAN Chunmiao;TIAN Fuchao;WANG Jingyan(State Key Laboratory of Coal Mine Safety Technology,China Coal Technology&Engineering Group Shenyang Research Institute,Fushun,Liaoning 113122,China;Fire&Explosion Protection Laboratory,Northeastern University,Shenyang,Liaoning 110004,China)

机构地区：[1]中煤科工集团沈阳研究院有限公司煤矿安全技术国家重点实验室,辽宁抚顺113122 [2]东北大学火灾爆炸防治实验室,辽宁沈阳110004

出　　处：《中国矿业大学学报》2022年第5期894-900,共7页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(52174229,52174230);辽宁省自然科学基金项目(2020-KF-13-01)

摘　　要：为了探究堆积煤尘遇高温表面热着火后,内部阴燃颗粒扬起引发煤尘爆炸的致灾机制,以褐煤为试验介质,首先研究了堆积褐煤在高温热板作用下的温升着火规律.结果表明:质量分数为40%的TiO_(2)粉末惰化条件下,褐煤层内峰值温度较纯褐煤高约60℃.粉末惰化程度同时影响堆积褐煤受热时的表层龟裂程度,低惰化程度下表层明显的龟裂现象虽利于煤氧反应、提高温升速率,但也降低层蓄热能力和层内峰值温度.同时,研究了2种不同挥发分堆积褐煤阴燃着火后作为点火源引燃煤粉尘云的能力.结果表明:高挥发分阴燃煤尘扬起后可引燃新鲜煤尘形成的煤尘云,致灾危险性更高.热重和微商热重的分析结果表明:热板作用下褐煤颗粒会经历挥发分热解至固定碳氧化着火的反应过程,从微观角度阐明了褐煤热板着火现象及着火颗粒扬起后的火源特性.In order to study the disaster-causing mechanism of coal dust explosion triggered by the lifting of internal smoldering particles after the ignition of stacked coal dust by high-temperature surface heat,the ignition law of stacked lignite under the action of high temperature hot plate was studied,firstly.The results show that the peak temperature in lignite bed is about 60℃higher than pure lignite after inerting with 40%TiO_(2)powder.At the same time,the degree of inerting affects the degree of surface cracking of stacked lignite when heated.Although the obvious cracking phenomenon of surface layer at low inerting degree is beneficial to coal oxygen reaction and increases the temperature rising rate,it also reduces the heat storage capacity and peak temperature in the layer.At the same time,the ability of two kinds of stacked lignite with different volatile content to ignite coal dust cloud after smoldering ignition were studied.The results show that the smoldering coal dust with high volatile content can ignite the coal dust clouds formed by fresh coal dust,which is more dangerous to cause disasters than the coal dust with low volatile content.The results of TG and DTG analysis show that lignite particles under the action of hot plate go through the reaction process from volatile fraction pyrolysis to fixed carbon oxidation ignition,which clarifies the phenomenon of hot plate ignition of lignite and the characteristics of ignition source after the ignited particles are raised from the microscopic perspective.

关 键 词：煤尘爆炸 火灾 阴燃 热板 惰化作用 

分 类 号：TD714.5[矿业工程—矿井通风与安全]