Spontaneous ignition characteristics of coal in a large-scale furnace: An experimental and numerical investigation

被引：67
作者：
Wen, Hu [1 ,2 ,3 ]
Yu, Zhijin [1 ,2 ,3 ]
Deng, Jun [1 ,3 ]
Zhai, Xiaowei [1 ,3 ]
机构：
[1] Xian Univ Sci & Technol, Coll Safety Sci & Engn, Xian 710054, Shaanxi, Peoples R China
[2] Xian Univ Sci & Technol, Key Lab Western Mine Explorat & Hazard Prevent, Minist Educ, Xian 710054, Shaanxi, Peoples R China
[3] Xian Univ Sci & Technol, Minist Educ, Engn Res Ctr, Xian 710054, Shaanxi, Peoples R China
来源：
APPLIED THERMAL ENGINEERING | 2017年 / 114卷
基金：
中国国家自然科学基金;
关键词：
Predictive models; Airflow behavior; High temperature zones; Thermal exchange; LOW-TEMPERATURE OXIDATION; SPONTANEOUS COMBUSTION; SEAM FIRES; MODEL; FLOW; STOCKPILES; MECHANISM; CHINA; ROCKS; AIR;
D O I：
10.1016/j.applthermaleng.2016.12.022
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A comprehensive understanding of the spontaneous combustion characteristics of coal in various surroundings is necessary for developing reliable test platform and predictive models. In this study, the characteristics of oxidation and self-heating combining various gas flow equations in loose coal were investigated separately and used to simulate the experimental procedure of spontaneous combustion. The main focus was to investigate the effect of thermal boundary on temperature profiles as well as spontaneous combustion period. The results showed that the numerical approach was validated by comparison with the test data. Furthermore, the model based upon Brinkman equation showed a higher accuracy, which indicated that airflow behavior influences the,balances of coal oxidation and heat dissipation, thus impacts the temperature profiles of loose coal. The areas of high temperature zones would be evidently expanded and the spontaneous ignition time would be significantly accelerated if the thermal exchange between the coal and its surroundings decreased. Our results, especially for the field of engineering, have substantial effects for grasping and controlling coal spontaneous combustion disaster. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：583 / 592
页数：10
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