煤尘
点火系统
煤
燃烧
最小点火能量
粉尘爆炸
自燃
机械
环境科学
材料科学
自燃温度
废物管理
工程类
化学
物理
航空航天工程
有机化学
作者
Xiaoxuan Shi,Xiaokun Chen,Yutao Zhang,Yuanbo Zhang,Ruizhi Guo,Tenglong Zhao,Rui Liu
出处
期刊:Energy
[Elsevier]
日期:2022-01-01
卷期号:239: 122227-122227
被引量:46
标识
DOI:10.1016/j.energy.2021.122227
摘要
In industries related to fossil energy, coal dust is often deposited at an angled position. A two–step parallel coal dust oxidation reaction mechanism is used to study the self–ignition and combustion characteristics of coal dust under inclination conditions. The consumption and transfer of multiple substances are considered. In addition, the gravity direction is used to simulate the influence of the inclination conditions on ignition characteristics of coal dust. Firstly, the reliability of the numerical model is verified, and the time series characteristics of the self–ignition and combustion of coal dust are studied. Then the characteristic parameters and evolution of self–ignition and combustion under different inclination are analyzed. The results show that under hot plate conditions, the ignition and combustion process of coal dust can be divided into five stages. The minimum ignition temperature of the coal dust layer (MITL) changes sinusoidally with the inclination angle. Coal dust deposited under the ceiling is easier to be ignited. As the temperature of the hot plate increases, the ignition delay time (IDT) is shortened. It is necessary to adjust the fire safety management according to the inclination conditions of the coal dust, especially in the area with an inclination angle of 150°–180°.
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