Investigations on unconfined large-scale methane explosion with the effects of scale and obstacles

被引:41
作者
Zhou, Yonghao [1 ]
Li, Yanchao [1 ]
Jiang, Haipeng [1 ]
Zhang, Kai [1 ]
Chen, Xiangfeng [1 ]
Huang, Lei [1 ]
Gao, Wei [1 ]
机构
[1] Dalian Univ Technol, Dept Chem Machinery & Safety Engn, State Key Lab Fine Chem, 2 Linggong Rd, Dalian 116024, Peoples R China
基金
中国博士后科学基金;
关键词
Unconfined methane explosion; Obstacle disturbance; Scale effect; Overpressure prediction; SELF-SIMILAR PROPAGATION; FLAME ACCELERATION; CLOUD EXPLOSION; RENEWABLE ENERGY; BLAST WAVE; AIR; DEFLAGRATION; TRANSITION; DETONATION; BIOGAS;
D O I
10.1016/j.psep.2021.09.004
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The strong pressure wave in gas explosion accident could cause great casualties and property loss, which has become the main threat to safety of chemical process and further popularization of clean energy. In this research, unconfined explosion experiments under different methane concentrations at 27 m(3) scale were performed with internal and external obstacles. The results showed that the flame buoyant effect was more obvious for the rich-fuel flame due to the excess methane accumulation. The reflection of the pressure wave could cause higher overpressure near the ground and the external obstacle enhanced the overpressure in the neighborhood. For 27 m(3) scale explosion, the critical flame radius for the flame acceleration was larger than 1 m(3) scale, because of the longer travelling distance for the reflection wave from the bottom. In addition, the acceleration exponent rose to 1.5 due to the full development of the hydrodynamic instability. The flame radius for peak overpressure, RM, was found to be at a certain distance from the outer obstacle bar center, which was 1.8 for N-b = 6, 1.35 for N-b = 4 and 0.9 for N-b = 2. The predicted results of peak overpressure agreed well with the experimental results, which extended the prediction model to the larger scale. (C) 2021 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:1 / 10
页数:10
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