烟煤填料床低温氧化演变特性及影响因素研究  

Research on the evolution characteristics and its influence factors of low-temperature oxidation of bituminous coal in packed bad

作　　者：皇甫文豪 黄瑜 王文达[2] 尤飞 张瑜[1] HUANGFU Wen-hao;HUANG Yu;WANG Wen-da;YOU Fei;ZHANG Yu(Jiangsu Key Laboratory of Urban and Industrial Safety, College of Safety Science and Engineering,Nanjing Tech University,Jiangsu Nanjing 210009,China;Institute of Fire Science and Engineering,Nanjing Tech University,Jiangsu Nanjing 211800,China;Key Laboratory of Mine Thermo-motive Disas- ter and Prevention,Ministry of Education,Liaoning Technical University,Liaoning Fuxin 123000,China)

机构地区：[1]南京工业大学安全科学与工程学院江苏省城市工业与安全重点实验室,江苏南京210009 [2]南京工业大学火灾与消防工程研究所,江苏南京211800 [3]辽宁工程技术大学矿山热动力灾害与防治教育部重点实验室,辽宁阜新123000

出　　处：《消防科学与技术》2019年第1期18-22,共5页Fire Science and Technology

基　　金：国家自然科学基金项目(51376089);矿山热动力灾害与防治教育部重点实验室资助项目(JSK200205)

摘　　要：为了探究粒度及氧浓度对烟煤升温氧化的影响,搭建了中尺度煤炭填料床低温氧化试验系统。利用该系统在2 L/min的进气孔流速,从室温升温至230℃,对5组不同粒径分级煤样及在不同氧浓度下进行升温氧化实验。基于低温氧化曲线,以加速度突变点为基准,获取加速点温度、自燃临界时间和临界升温速率3个过程参量,藉以将其划分为缓慢升温阶段(25～150℃)和快速升温阶段(>150℃),并对其演变特性进行阐述。对临界升温速与粒径平均值以及临界升温速率与进气口氧浓度进行线性拟合,发现其间具有良好的线性关系。临界升温速率随粒径平均值、进气口氧浓度的增大而增大,表明较宽的粒度分级及较大的氧气浓度增加了煤炭的升温氧化诱导自燃的危险性。In order to research the influence of particle sizes and ox ygen concentrations on heating and oxidation of bituminous coal,a mesoscale lowtemperature oxidation system supported by packed bed was established.By using this experiment system under 2 L/min inlet velocity,five size grading samples and different oxygen concentration heating and oxidation experiments were conducted from indoor temperature to 230℃.Based on low-temperature oxidation curve and taking acceleration mutation point as benchmark, three process variables including acceleration point temperature, critical time of spontaneous combustion,critical heating rate were obtained.The evolution process was divided into two stages:slow ly heating stage (25150 ℃)and rapid heating stage (>150℃),in addition,the evolution characteristics were expounded briefly. The linear relationship between critical heating rate and average particle size,critical heating rate and inlet oxygen concentration were linear fitted,and results showed good linear relationship.Re suits demonstrated that critical heating rate increasing with the in crease of average particle size and inlet oxygen concentration,and indicate that the wider size grading and higher oxygen concentra tions increase the risk of spontaneous combustion induced by heat ing of coal.

关 键 词：填料床 烟煤 低温氧化 高温自热诱导燃烧 演变行为 粒度分级 氧浓度 

分 类 号：X936[环境科学与工程—安全科学] TK121[动力工程及工程热物理—工程热物理]