碳酸钾改性干水-六氟丙烷抑制甲烷爆炸特性  

Coupling Inhibition Effects of Dry Water Modified by Potassium Carbonate and Hexafluoropropane on Methane Explosion

作　　者：王涛 孟帆 弋伟斋 田晓月 李睿康 苏彬 刘利涛 罗振敏 WANG Tao;MENG Fan;YI Weizhai;TIAN Xiaoyue;LI Ruikang;SU Bin;LIU Litao;LUO Zhenmin(School of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,Shaanxi,China)

机构地区：[1]西安科技大学安全科学与工程学院,陕西西安710054

出　　处：《高压物理学报》2025年第4期77-88,共12页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(52004208,52304252)。

摘　　要：爆炸抑制技术是减轻瓦斯爆炸事故灾后影响的重要手段。为探究两相复合抑爆剂的抑制效果,选取碳酸钾改性干水粉体和六氟丙烷(C_(3)H_(2)F_(6))气体为抑爆介质,通过试验研究了二者复配影响下甲烷爆炸压力和时间参数的变化规律,并对其协同抑爆机理开展了理论分析。试验结果表明,在富燃工况下,甲烷爆炸的快速燃爆时间和持续燃烧时间随着碳酸钾改性干水和C_(3)H_(2)F_(6)配比的增加而增加,碳酸钾改性干水大幅提升了C3H2F6的抑制效果。贫燃、化学当量比和富燃工况下,气-固两相抑制剂的临界抑爆配比分别为5%-6 g、3%-6 g、1%-4 g。理论分析结果显示:复配抑爆剂对甲烷爆炸的物理抑制作用表现为稀释可燃物浓度、降低反应体系温度和稀释氧浓度;化学抑制作用方面,碳酸钾和C_(3)H_(2)F_(6)热解产生的KCO_(3)、KOH、OH和含氟基团降低了甲烷爆炸链式反应产生的关键自由基浓度。研究结果可为清洁抑爆材料及相应抑爆技术的研发提供理论依据。Explosion suppression technology plays a vital role in reducing the hazardous effect of gas explosion incidents.This study aimed to investigate the explosion suppression effect of two-phase composite inhibitor mixtures of hexafluoropropane and dry water modified by potassium carbonate.The explosion pressure and time parameters of methane-air mixtures were obtained experimentally.Then the synergistic mechanisms on methane explosion suppression was analyzed theoretically.Results of the experiments shows that the combustion time of methane-air mixtures increase with the rising ratio of dry water modified by potassium carbonate in the coupled inhibitors.Dry water modified by potassium carbonate greatly enhanced the explosion suppression effect of C_(3)H_(2)F_(6).The critical inhibition ratios of gas-solid inhibitors are 5%-6 g,3%-6 g,and 1%-4 g for fuel-lean,stoichiometric,and fuel-rich methane-air mixtures,respectively.Moreover,the physical inhibition effects of the dilution in the premixed mixtures and the reduction in the flame temperature,as well as the chemical suppression effect,synergistically inhibit the deflagration of methane-air mixtures.In terms of the chemical inhibition,it is KCO_(3),KOH,OH and fluorine-containing groups that produced by the pyrolysis of potassium carbonate and C_(3)H_(2)F_(6) reduce the concentration of key radicals of methane explosion.The results of the work will help to providing the theoretical basis for the development of more effective explosion-suppressant and promoting the related explosion-suppressing technology.

关 键 词：甲烷爆炸 改性干水 六氟丙烷 爆炸特性 抑制机理 

分 类 号：O389[理学—流体力学] O521.9[理学—力学] X932[环境科学与工程—安全科学]