Analysis of Reverse Smoldering Propagation in a Horizontally Packed Bed of Porous Medium

摘要：

Based on a one-step kinetic mechanism (only including fuel oxidation), a one-dimensional, unsteady, numerical model is presented for reverse smoldering propagation in horizontally packed beds of porous media. By simplifying the model parameters and using asymptotic methods, two simplified equations are obtained to qualitatively describe the reverse smoldering propagation. The results show that the smoldering temperature increases with increasing the gaseous mass flux, but the increasing amplitude is reduced due to the convective cooling of preheat zone. With increasing the gaseous mass flux. the smoldering velocity increases to a maximum and decreases until quenching occurs at the maximum inlet airflow velocity. The qualitative analysis shows that the smoldering wave is also sustained by the oxygen already present in the porous medium through the diffusion of gaseous species though the supplied airflow is zero, namely, Mg=0. Moreover, the key points of reverse smoldering combustion and its quenching arc analyzed.

关键词： porous medium reverse smoldering quenching smoldering velocity smoldering temperature

作者: JIA Baoshan CHEN Jing LIANG Yuntao XIE Maozhao

作者单位: School of Safety Science and Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China Fnshun Branch,China Coal Mining Research Institute,Fushun 113001,Liaoning,China School of Energy and Power,Dalian University of Technology,Dalian 116024,Liaoning,China

会议类型: 国际会议

会议名称: The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)

会议地点: 北京

会议语种:英文

页码: 1277-1282

在线出版日期: 2008-09-24（万方平台首次上网日期，不代表论文的发表时间）