[1]张云,赵懿明,谭迎新,等.粒径对煤粉云最低着火温度特性的影响[J].爆破器材,2021,50(06):37-42.[doi:10.3969/j.issn.1001-8352.2021.06.006]
　ZHANG Yun,ZHAO Yiming,TAN Yingxin,et al.Influence of Particle Size on Minimum Ignition Temperature Characteristics of Coal Dust Cloud[J].EXPLOSIVE MATERIALS,2021,50(06):37-42.[doi:10.3969/j.issn.1001-8352.2021.06.006]
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粒径对煤粉云最低着火温度特性的影响()
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《爆破器材》[ISSN:1001-8352/CN:32-1163/TJ]

卷:
50
期数:
2021年06
页码:
37-42
栏目:
爆炸材料
出版日期:
2021-11-26

文章信息/Info

Title:
Influence of Particle Size on Minimum Ignition Temperature Characteristics of Coal Dust Cloud
文章编号:
5610
作者:
张云; 赵懿明; 谭迎新; 尉存娟; 杨振欣; 周庄红; 曹卫国
中北大学环境与安全工程学院（山西太原，030051）
Author(s):
ZHANG Yun;  ZHAO Yiming;  TAN Yingxin;  YU Cunjuan;  YANG Zhenxin;  ZHOU Zhuanghong;  CAO Weiguo
School of Environmental and Safety Engineering, North University of China (Shanxi Taiyuan, 030051)
关键词:
煤粉; 最低着火温度; 粒径; 分解过程; 中间产物
Keywords:
coal dust;  minimum ignition temperature;  particle size;  pyrolysis process;  intermediates
分类号:
X932
DOI:
10.3969/j.issn.1001-8352.2021.06.006
文献标志码:
A
摘要:
为了研究粒径对煤粉云最低着火温度特性的影响，采用粉尘云最低着火温度测试装置测试了不同粒径下煤粉云的最低着火温度，并结合ReaxFF分子动力学对其反应机理进行了微观层面的探讨。结果表明：当煤粉中位径在34 μm时，煤粉云的最佳着火质量浓度为750 g/m3，最低着火温度为550 ℃；随着煤粉粒径的增加，煤粉云最低着火温度逐渐增大，当煤粉中位径达到124 μm，煤粉云最低着火温度上升至650 ℃。通过ReaxFF分子动力学对煤粉热解过程的计算结果表明：随着反应的进行，大分子煤结构逐步分解，芳香环、C—C键、C—O键和C—H键等断裂，产生更小的分子结构，其中，H2、H2O、CO2和CH2O等小分子产生的数量逐渐增多；H·自由基和OH·自由基在反应初期有明显的数量变化，且其含量对于最终稳定产物有重要影响。
Abstract:
To explore the influence of particle size on the minimum ignition temperature characteristics of coal dust cloud, the minimum ignition temperature of coal dust cloud with different particle sizes was tested by using the minimum ignition temperature test device of dust cloud. The reaction mechanism was discussed at micro scopic level using ReaxFF molecular dynamics research method. The results show that when the median diameter of coal particle is 34 μm, the optimum ignition mass concentration and minimum ignition temperature of coal dust cloud are 750 g/m3 and 550 ℃, respectively. The minimum ignition temperature of coal dust cloud gradually increases with the increase of coal particle size. When the median diameter of coal particle reaches 124 μm, the minimum ignition temperature of coal dust cloud rises to 650 ℃. In addition, the pyrolysis result of coal dust calculated by ReaxFF molecular dynamics shows that, with the reaction proceeding, the structure of macro-molecular coal is decomposed step by step, and the aromatic rings, C—C bonds, C—O bonds, and C—H bonds fractures to form the smaller molecular structure. Among them, the numbers of small molecules such as H2, H2O, CO2, and CH2O gradually increase. H· radicals and OH· radicals have obvious quantity changes at the initial stage of the reaction, and its content has an important influence on the final stable product.

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备注/Memo

备注/Memo:
收稿日期：2021-05-25
基金项目：国家自然科学基金（11802272）; 山西省重点研发项目（201903D121028）; 山西省自然科学基金（201901D211228）
第一作者：张云（1986-），女，博士，主要从事能源爆炸能量释放调控规律方向研究。E-mail：zhangyun@nuc.edu.cn
通信作者：曹卫国（1984-），男，博士，副教授，主要从事粉尘/气体多相流燃烧与爆炸研究。E-mail：caoweiguoiem@nuc.edu.cn
更新日期/Last Update: 2021-11-22