CF₃I/CO₂对掺氢天然气燃爆的抑制作用机理研究

Study on the Inhibition Mechanism of CF₃I/CO₂ on the Combustion and Explosion of Hydrogen-Enriched Natural Gas

摘要: 掺氢天然气中氢气的爆炸风险制约其应用，开发高效清洁的抑爆剂具有重要价值。基于CF₃I与CO₂对甲烷的抑爆协同效应，构建化学动力学模型，研究二者对氢气/甲烷/空气预混爆炸的抑制机理，重点分析了层流燃烧速度及其敏感性和H·在反应中的生成与消耗，筛选出了影响抑爆的基元反应，筛选出了1818、R1788抑制效果与CO₂浓度相关。通过分析获得0.5% CF₃I与15% CO₂为最佳复配比例。同时发现此比例下能高效抑制H·链式反应的同时兼顾经济性，为掺氢天然气安全利用及低耗环保型抑爆剂开发提供了理论依据。

Abstract: The explosion risk associated with hydrogen in hydrogen-enriched natural gas limits its application, making the development of efficient and clean explosion suppressants of great importance. Based on the synergistic suppression effect of CF₃I and CO₂ on methane explosions, this study constructs a chemical kinetic model to investigate the inhibition mechanism of these two agents on the explosion of hydrogen/methane mixtures. The analysis focuses on the laminar burning velocity, its sensitivity, and the production and consumption pathways of key radical H·. Elementary reactions influencing explosion suppression were identified, with reactions R1818 and R1788 showing suppression effects correlated with CO₂ concentration. An optimized mixture of 0.5% CF₃I and 15% CO₂ was determined, which effectively inhibits the H radical chain reaction while maintaining cost efficiency. This research provides theoretical support for the safe utilization of hydrogen-enriched natural gas and the development of low-consumption, environmentally friendly explosion suppressants.