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| 瓦斯输送管道内抑爆过程数值模拟研究 |
| Numerical Simulation Research on Explosion Suppression Process in Methane Transmission Pipeline |
| 投稿时间：2013-04-18 修订日期：2013-06-28 |
| DOI： |
| 中文关键词: 抑爆 有限速率燃烧模型 火焰熄灭 幂律模型 |
| 英文关键词: explosion suppression finite rate combustion model frame extinguish power-law model |
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| 中文摘要: |
| 基于流体动力学和燃烧理论,建立了管道直径为500mm的瓦斯爆炸数学模型,借助于Fluent流体力学软件,采用有限速率燃烧模型,对管道内甲烷预混气体爆炸后被惰性气体熄灭的过程进行了数值模拟研究,考察了瓦斯被点燃后,喷入不同流量高压、低温二氧化碳气体后管道内的燃烧流场特性。结果发现,二氧化碳喷入量低于12kg/s不能使管内火焰熄灭；二氧化碳喷入量大于16kg/s时,能大大降低管道内混合气体温度,同时稀释甲烷和氧气浓度,导致火焰在二氧化碳喷入口所在管道截面处熄灭；此过程中管内最大反应速率降低过程可分为三个阶段,其中两个快速降低阶段均符合幂率模型；二氧化碳喷入量在16kg/s至100kg/s之间时,火焰熄灭时间先迅速减低后变化缓慢；模拟结果与试验结果吻合较好。研究为煤矿防爆抑爆研究工作提供理论依据和参考,同时对保障煤矿安全生产和人民的生命安全也具有重要的现实意义。 |
| 英文摘要: |
| based on the theory of fluid dynamics and combustion, the mathematical model of gas explosion in the pipe with diameter of 500mm was established, numerical simulation study on the flame’s quenching process in inert gas was conducted by using of the finite rate combustion model, and the characteristics of explosion field by injecting different flow rate of high pressure and low temperature CO2 was also investigated. The results showed that, when the CO2 injection was less than 12kg/s, it could not extinguish the flame in the pipe, however, when the CO2 injection was greater than 16kg/s, it could greatly reduce the temperature of the mixed gas, and also dilute the concentration of methane and oxygen, and eventually led to the flame extinguished at the carbon dioxide entrance. The reducing process of the maximum reaction rate could be divided into three stages, where two of the high-speed reducing stages satisfied the power-law model. When the CO2 injection is between 16kg/s to 100kg/s, the extinction time reduced rapidly, and then changed slowly; the simulation results were agreement well with the experiment data. Research in this paper could provide theoretical basis and reference for the explosion suppression in coal mine, and also had practical significance to protect the safety of people’s lives during coal mine production. |
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