不同粒度煤样高温燃烧特性研究  

Study on high temperature combustion characteristics of coal samples with different particle size

作　　者：文辰辰 张雷林[1,2] 张美琴[3] WEN Chenchen;ZHANG Leiin;ZHANG Meiqin(School of Safety Science and Engineering,Anhui University of Science and Technology,Huainan 232001,China;Key Laboratory of Mining Coal Safety and Efficiently Constructed by Anhui Province and the Ministry of Education,Huainan 232001,China;Sizing Plant of Peigou Coal Mine,Zhengzhou Coal Industry(Group)Co.,Ltd.,Zhengzhou 452382,China)

机构地区：[1]安徽理工大学安全科学与工程学院,安徽淮南232001 [2]煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001 [3]郑煤集团裴沟煤矿筛选厂,河南郑州452382

出　　处：《矿业安全与环保》2023年第6期60-64,71,共6页Mining Safety & Environmental Protection

基　　金：国家自然科学基金项目(51874008)。

摘　　要：为研究不同粒度煤样高温条件下的燃烧特性及燃烧效率,采用锥形量热仪测试了6种粒度煤样在热辐射作用下的燃烧特性参数。研究结果表明,煤样点燃时间与煤颗粒大小总体呈正相关关系;热释放速率峰值随煤样粒径减小而逐渐下降,在热释放速率曲线稳定阶段(>150 s),不同粒径煤样热释放速率由大到小依次为>0~0.12、>0.12~0.15、>0.15~0.18、>0.18~0.25、>0.25~0.38、>0.38~0.83 mm;总热释放量随粒径减小而逐渐增加;总烟释放量随煤样粒径增大而上升,最大粒径煤样(>0.38~0.83 mm)的烟气生成速率和总烟释放量均为最大;煤样燃烧过程中CO生成速率和CO_(2)生成速率均随煤样粒径减小而逐渐增大。引入煤样的火灾性能指数(FFPI)和火灾增长指数(FFGI),对比分析不同粒度煤样的燃烧效率得出:最小粒径煤样(>0~0.12 mm)的燃烧效率最高,FFPI最小(0.27 m^(2)·s/kW),FFGI最大(3.70 kW/(m^(2)·s))。研究结果对揭示高温环境下粒度对煤样燃烧特性的影响具有一定的借鉴意义。In order to study the combustion characteristics and combustion efficiency of coal samples with different particle sizes under high temperature conditions,the combustion characteristics parameters of 6 coal samples with different particle size under thermal radiation were measured by cone calorimeter.The results show that the ignition time is positively correlated with the coal particle size.The peak value of heat release rate gradually decreases with the decrease of coal particle size.In the stable stage of the heat release rate curve(>150 s),the heat release rates of coal samples with different particle sizes in descending order is>0 mm to 0.12 mm,>0.12 mm to 0.15 mm,>0.15 mm to 0.18 mm,>0.18 mm to 0.25 mm,>0.25 mm to 0.38 mm,>0.38 mm to 0.83 mm,and the total heat release rate increases gradually with the decrease of particle size.With the increase of coal particle size,the total smoke release increases,and the flue gas generation rate and total smoke release of the coal sample with the largest particle size(>0.38 mm to 0.83 mm)are the largest.The rates of CO and CO_(2)generation increase with the decrease of coal particle size during coal sample combustion.The fire performance index(FFPI)and fire growth index(FFGI)of coal samples were introduced,and the combustion efficiency of coal samples with different particle sizes was compared and analyzed.The results show that coal sample with the smallest particle size(>0 mm to 0.12 mm)has the highest combustion efficiency.The lowest value of fire performance index(FFPI)is 0.27 m^(2)·s/kW,and the highest value of fire growth index(FFGI)is 3.70 kW/(m^(2)·s).The research results have a certain reference significance for revealing the influence of particle size on the combustion characteristics of coal samples under high temperature environment.

关 键 词：煤样粒度 燃烧特性参数 热释放 烟释放 燃烧效率 

分 类 号：TD75[矿业工程—矿井通风与安全]