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›› 2011, Vol. 11 ›› Issue (5): 812-817.

• 过程与工艺 • 上一篇    下一篇

定容体系中氮气影响瓦斯爆炸反应的动力学模拟

贾宝山 李艳红 曾文 梁运涛 温海燕   

  1. 辽宁工程技术大学安全科学与工程学院 辽宁工程技术大学 安全科学与工程学院 沈阳航空工业学院 动力与能源工程学院 煤炭科学研究总院沈阳研究院煤矿安全技术国家重点实验室 辽宁工程技术大学 安全科学与工程学院
  • 收稿日期:2011-03-28 修回日期:2011-07-01 出版日期:2011-10-20 发布日期:2011-10-20
  • 通讯作者: 贾宝山

Kinetic Simulation for the Effect of N2 Content on Gas Explosion in an Constant Volume System

JIA Bao-shan LI Yan-hong ZENG Wen LIANG Yun-tao WEN Hai-yan   

  1. College of Safety Science and Engineering, Liaoning Technical University College of Safety Science & Engineering, Liaoning Technical University School of Engine and Energy Engineering, Shenyang Aeronautical University State Key Laboratory of Coal Mine Safety Technology, Shenyang Branch of China Coal Research Institute College of Safety Science & Engineering, Liaoning Technical University
  • Received:2011-03-28 Revised:2011-07-01 Online:2011-10-20 Published:2011-10-20
  • Contact: JIA Bao-shan

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被引次数

31

摘要： 为考察惰性气体(N2)对瓦斯爆炸过程的影响，建立了受限空间(定容弹)中瓦斯爆炸反应的计算模型，化学反应采用详细反应机理(包括53种组分、325个反应). 结果显示，影响瓦斯爆炸及爆炸后部分致灾性气体生成的关键反应步有R32, R53, R98, R155, R156, R158, R161, R170，瓦斯爆炸会产生瞬间高温和高压，爆炸持续时间仅为0.0001 s左右；惰性气体(N2)对瓦斯爆炸有抑制作用，混合气中N2浓度越大，瓦斯引爆时间越延迟，且随N2浓度增长，爆炸强度也越弱(充入10%, 15%, 20% N2，爆炸时间分别延迟0.0009, 0.0013, 0.0019 s，爆炸后压力以约5.065 kPa递减，爆炸温度以约35 K递减)；在混合气体中充注N2能在一定程度上抑制CO, CO2, NO, NO2等有害气体的生成，含N2量增加抑制作用更明显.

关键词: 瓦斯爆炸, N2, 反应动力学, 链式反应, 数值模拟, 敏感性分析

Abstract: In order to seek the effect of inert gas (N2) on the process of gas explosion in enclosed space, the computational model of gas explosion in enclosed space (constant volume bomb) is built, and the detailed reaction mechanisms (including 53 species and 325 reactions) are adopted. The process is analyzed by applying this model. Through the sensitivity analysis of the reaction mechanisms of gas explosion, the key reactions that affect gas explosion and the formation of catastrophic gases are R32, R53, R98, R155, R156, R158, R161 and R170. And the inhibition mechanism of N2 on gas explosion and formation of catastrophic gases are analyzed. The results show that the gas explosion can produce transient high temperature and high pressure, and the duration of gas explosion is only 0.0001 s. The inert gas (N2) can inhibit the process of gas explosion, and the ignition time of gas explosion is more delayed with increasing of the mole fraction of N2 in the mixed gas. Correspondingly, the explosion intension is weaker (adding 10%, 15% and 20% N2, the gas explosion time delays 0.0009, 0.0013, and 0.0019 s respectively, the pressure decreases about 5.065 kPa progressively, the temperature decreases about 35 K progressively). Furthermore, the inert gas (N2) will inhibit the formations of CO, CO2, NO and NO2. At the same time, with the mole fraction of N2 in the mixed gas increasing, the inhibition will be more distinct.

Key words: gas explosion, N2, chemical reaction kinetics, chain reaction, numerical simulation, sensitivity analysis

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