Numerical simulation of the influence of vent conditions on H2/air explosion characteristics

doi:10.16085/j.issn.1000-6613.2020-1744

Chemical Industry and Engineering Progress ›› 2021, Vol. 40 ›› Issue (7): 3656-3663.DOI: 10.16085/j.issn.1000-6613.2020-1744

• Chemical processes and equipment • Previous Articles Next Articles

Numerical simulation of the influence of vent conditions on H₂/air explosion characteristics

ZHOU Ning¹(), XU Yingying¹, CHEN Bing², LI Xue¹, QIAO Shiwei¹, YUAN Xiongjun¹, LIU Jun¹, HUANG Weiqiu¹, ZHAO Huijun¹

^1.Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology, Changzhou University, Changzhou 213164, Jiangsu, China
^2.China Academy of Safety Science and Technology, Beijing 100012, China

Received:2020-08-31 Revised:2020-09-30 Online:2021-07-19 Published:2021-07-06
Contact: ZHOU Ning

泄爆条件对预混H₂/空气燃爆特性影响的数值模拟

周宁¹(), 徐莹莹¹, 陈兵², 李雪¹, 乔世伟¹, 袁雄军¹, 刘俊¹, 黄维秋¹, 赵会军¹

^1.常州大学江苏省油气储运技术重点实验室，江苏常州 213164
^2.中国安全生产科学研究院，北京 100012

通讯作者: 周宁
作者简介:周宁（1977—），男，教授，研究生导师，研究方向为安全工程。E-mail：zhouning@cczu.edu.cn。
基金资助:
国家重点研发计划重点专项(2017YFC0805100);中国安全生产科学研究院基本科研业务费专项资金项目(2019JBKY08);第十六批“六大人才高峰”创新人才团队项目(TD-JNHB-013);江苏省高校自然科学研究重大项目(17KJA440001)

Abstract

Abstract:

To study the influence of broken membrane pressure on combustible gas explosion characteristics, the large eddy simulation (LES) and Zimont combustion model were used to simulate the combustion process of H₂/air premixed gas under different broken membrane pressure conditions at the vent (0.1MPa, 0.3MPa, 0.5MPa, 0.7MPa). The results showed that there were three peaks and two troughs in the flame propagation velocity curve under each working condition in the pipeline with a large aspect ratio due to wall effect, acoustic shock, and flame instability. Except for the working condition with the broken membrane pressure of 0.1MPa, the opening of the vent produced a deceleration effect, which made the flame propagation speed lower than that of the closed pipeline in each condition. The pressure in the pipeline of each working condition suggested a general downward trend after the opening of the vent, and the lower the broken membrane pressure, the smaller the pressure peak. Compared with the closed pipeline, the rate of pressure rises of each working condition decreased, and the intensity of the explosion decreased. When the broken membrane pressure was 0.3MPa, the pressure rise rate dropped to the largest extent, and the venting effect was the best.

Key words: hydrogen explosion, vent, broken membrane pressure, flame propagation speed, pressure

摘要：

为研究泄爆口处破膜压力对管道内可燃气体燃爆特性的影响，基于大涡模拟（LES）和Zimont燃烧模型，在泄爆口不同破膜压力条件下（0.1MPa、0.3MPa、0.5MPa、0.7MPa），对预混H₂/空气燃爆过程开展三维数值模拟。结果表明：在大长径比管道内，由于管壁作用、声波震荡作用及火焰的不稳定性，各工况条件下火焰传播速度曲线存在3个波峰、2个波谷；除破膜压力为0.1MPa工况外，泄爆口开启产生减速效应，使各工况条件下的火焰传播速度相比于密闭管道均下降；各工况的管内压力在泄爆口开启后整体呈下降趋势，且泄爆口的破膜压力越小，管内压力峰值越小；对比密闭管道，各工况的压力上升速率均有不同程度的降低，爆炸强度减弱，破膜压力为0.3MPa时，压力上升速率的下降幅度最大，泄爆效果最好。

关键词: 氢气爆炸, 泄爆, 破膜压力, 火焰传播速度, 压力

CLC Number:

X932

ZHOU Ning, XU Yingying, CHEN Bing, LI Xue, QIAO Shiwei, YUAN Xiongjun, LIU Jun, HUANG Weiqiu, ZHAO Huijun. Numerical simulation of the influence of vent conditions on H₂/air explosion characteristics[J]. Chemical Industry and Engineering Progress, 2021, 40(7): 3656-3663.

周宁, 徐莹莹, 陈兵, 李雪, 乔世伟, 袁雄军, 刘俊, 黄维秋, 赵会军. 泄爆条件对预混H₂/空气燃爆特性影响的数值模拟[J]. 化工进展, 2021, 40(7): 3656-3663.

Figures/Tables 9

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