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[1]步允川,牛会永,邱天,等.预氧化浸水煤体表面结构变化及复燃特性*[J].中国安全生产科学技术,2021,17(11):32-39.[doi:10.11731/j.issn.1673-193x.2021.11.005]
　BU Yunchuan,NIU Huiyong,QIU Tian,et al.Surface structure changes and re-ignition characteristics of pre-oxidized and water-immersed coal[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2021,17(11):32-39.[doi:10.11731/j.issn.1673-193x.2021.11.005]
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预氧化浸水煤体表面结构变化及复燃特性*
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
17
期数:
2021年11期
页码:
32-39
栏目:
学术论著
出版日期:
2021-11-30

文章信息/Info

Title:
Surface structure changes and re-ignition characteristics of pre-oxidized and water-immersed coal
文章编号:
1673-193X(2021)-11-0032-08
作者:
步允川; 牛会永; 邱天; 李硕鹏; 杨雁晓; 徐永亮
（1.北京科技大学 土木与资源工程学院，北京 100080；
2.北京化工大学 机电工程学院，北京 100080；
3.河南理工大学 安全科学与工程学院，河南 焦作 454000）
Author(s):
BU Yunchuan;  NIU Huiyong;  QIU Tian;  LI Shuopeng;  YANG Yanxiao;  XU Yongliang
(1.School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100080,China;
2.School of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100080,China;
3.College of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo Henan 454000,China)
关键词:
高温预氧化; 浸水; 孔隙结构; 煤自燃; 特征参数; 氧浓度
Keywords:
high-temperature pre-oxidation;  water-immersed;  pore structure;  coal spontaneous combustion;  characteristic parameter;  oxygen concentration
分类号:
X936
DOI:
10.11731/j.issn.1673-193x.2021.11.005
文献标志码:
A
摘要:
为研究预氧化长期浸水煤体孔隙结构变化及贫氧复燃特性，以长焰煤原煤（RC）、浸水煤(S200)、预氧化200浸水煤(O200I200)、预氧化300浸水(O300I200)煤为研究对象，采用N2吸附、电镜扫描、热重实验手段，在21%,15%,10%,5%氧浓度下进行实验分析。结果表明：浸水后煤样比表面积增大，低温氧化最大质量变化率（DTG）较高，促进低温氧化过程煤氧复合反应；预氧化浸水煤样平均孔径增加，初始放热温度较小，总放热量增加，其中O200I200煤样热参数相对较大。随氧浓度增加，各煤样着火点温度减小，活化能增加，O200I200煤样的这2个参数较小；随氧浓度降低，煤样初始放热温度增加，最大放热量与总放热量减小。O200I200煤体孔隙较发达，锁水能力较强，持续升温后氧化能力较强，更易复燃。
Abstract:
To study the change of pore structure of the pre-oxidized and long-term water-immersed coal and its oxygen-lean re-ignition characteristics,taking the raw long flame coal (RC),water-immersed coal (S200),pre-oxidized 200 and water-immersed coal (O200I200),pre-oxidized 300 and water-immersed coal (O300I200) as the research objects,the experimental analysis were conducted under the oxygen concentration of 21 %,15 %,10 % and 5 % respectively by means of the nitrogen adsorption,scanning electron microscopy and thermogravimetric experiments.The results showed that the specific surface area of coal samples increased after immersion in water,and the maximum mass change rate (DTG) of low-temperature oxidation was higher,which promoted the coal-oxygen composite reaction in the low-temperature oxidation process.The average pore diameter of pre-oxidized and water-immersed coal samples increased,the initial heat release temperature was smaller,and the total heat release increased.The thermal parameters of the O200I200 coal sample were larger than those of the other coal samples.As the oxygen concentration increased,the ignition temperature of each coal sample decreased,and the activation energy increased,while these two parameters of the O200I200 coal sample were smaller.With the decrease of oxygen concentration,the initial heat release temperature of coal samples increased,the maximum heat release and total heat release decreased.The O200I200 coal body had more developed pores,stronger water-locking ability,and stronger oxidation ability after the continuous heating,which was easier to occur the re-ignition.

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备注/Memo

备注/Memo:
收稿日期： 2021-06-01
* 基金项目： 国家自然科学基金项目（51474106，51874131，52174163）
作者简介： 步允川，博士研究生，主要研究方向为矿井火灾防治。
通信作者： 牛会永，博士，教授，主要研究方向为矿井火灾防治理论与技术、矿山灾害救援与事故调查分析技术。
更新日期/Last Update: 2021-12-08