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This study investigates the influence of ethylene blending on methane explosion characteristics and the suppression mechanism of carbon dioxide (CO?). Experiments and simulations were conducted at ambient temperature and pressure (T=298 K， p0=0.1 MPa) using a standardized 20 L spherical explosion vessel， complemented by Chemkin software employing the USC Mech II detailed reaction mechanism (111 species， 784 reactions). The effects of the ethylene blending ratio (R， ranging from 0 to 1) and CO? addition (0 to 20% by volume) on the explosion characteristics of methane-ethylene-air premixed mixtures were systematically examined， with the equivalence ratio maintained at unity across all tests. Experimental results demonstrate that ethylene blending significantly enhances the explosion intensity and reaction rate of methane. As R increased from 0 to 1， the maximum explosion pressure (pmax) rose by 16.5%， the maximum rate of pressure rise [(dp/dt)max] increased by a factor of 2.3， and the flame propagation velocity accelerated from 2.37 m/s to 5.47 m/s. CO? exhibited a pronounced inhibitory effect on explosions; however， its suppression efficacy diminished at higher ethylene ratios. For instance， at R=0.4， the addition of 20% CO? resulted in a 50% reduction in pmax， a 91.9% decrease in (dp/dt)max， and a 73.8% reduction in laminar burning velocity. Chemical kinetics analysis revealed that ethylene modifies the reaction network by introducing pathways such as R254 (C2H4+OH=C2H3+H2O) and R16 (HO2+H=2OH)， which collectively enhance the concentration of OH radicals and the rate of the crucial chain-branching reaction R1 (H+O2=O+OH). Conversely， CO? participates in reaction R31 (CO2+H =CO+OH)， consuming H radicals and thereby reducing overall reaction intensity. This research elucidates the kinetic mechanisms through which ethylene and CO? respectively enhance and suppress explosions by regulating OH radical concentration and key reaction pathways. The findings provide a theoretical foundation and engineering guidance for risk assessment and explosion suppression design in industrial environments where methane and ethylene coexist.
[1] 贾爱林， 程刚， 陈玮岩， 等. 双碳背景下中国天然气供需形势预测[J]. 石油勘探与开发， 2023， 50(2):431–440.
[2] Li Zhenxi， ?hman M， Nilsson L J， et al. Towards carbon neutrality: transition pathways for the Chinese ethylene industry[J]. Renewable and Sustainable Energy Reviews， 2024， 199: 114540.
[3] GB 50160—2008(2018年版) 石油化工企业设计防火标准[S].
[4] Baalisampang T， Abbassi R， Garaniya V， et al. Modelling an integrated impact of fire， explosion and combustion products during transitional events caused by an accidental release of LNG[J]. Process Safety and Environmental Protection， 2019， 128: 259–272.
[5] 周宁， 张倩， 李雪， 等. 风速对LNG泄漏扩散过程影响的数值模拟[J]. 安全与环境学报， 2021， 21(1): 285–294.
[6] Liu W， Kelley A P， Law C K. Flame propagation and counterflow nonpremixed ignition of mixtures of methane and ethylene[J]. Combustion and Flame， 2010， 157(5):1027–1036.
[7] 罗振敏， 李逵， 毛文龙， 等. 少量乙烯对甲烷爆炸危险性及反应历程的影响[J]. 西安科技大学学报， 2018， 38(1): 17–25.
[8] 聂晓康， 邱冰冰， 任航， 等. 预热温度、乙烯掺混对甲烷/空气层流扩散燃烧特性影响的数值模拟研究[J]. 燃烧科学与技术， 2021， 27(6): 675–686.
[9] 李胜利， 王长禄， 郑义， 等. 惰性气体喷射参数对H_(2)–CH_(4)混合气体爆炸抑制效果的影响[J]. 工矿自动化， 2025， 51(8): 134–140， 147.
[10] Chang Xinyu， Li Yuanfang， Yao Ning， et al. Propagation characteristics and inherent instability of hydrogen-air premixed flame with inert gas dilution[J]. International Journal of Hydrogen Energy， 2024， 84: 132–145.
[11] Mitu M， Prodan M， Giurcan V， et al. Influence of inert gas addition on propagation indices of methane–air deflagrations[J]. Process Safety and Environmental Protection， 2016， 102: 513–522.
[12] Mitu M， Giurcan V， Razus D， et al. Inert gas influence on the laminar burning velocity of methane-air mixtures[J]. Journal of Hazardous Materials， 2017， 321: 440–448.
[13] 李成兵， 吴国栋， 周宁， 等. N_(2)/CO_(2)/H_(2)O抑制甲烷燃烧数值分析[J]. 中国科学技术大学学报， 2010， 40(3): 288–293.
[14] 路长， 刘洋， 王鸿波， 等. CO_(2)、H_(2)对CH_(4)/Air预混气爆炸特性的影响[J]. 安全与环境学报， 2018， 18(5): 1788–1795.
[15] Charles L， Pierre B， Nathalie L， et al. Experimental investigation on laminar burning velocities of ammonia/hydrogen/air mixtures at elevated temperatures[J]. Fuel， 2020， 263: 116653.
[16] Wang H， You X Q， Joshi A V， et al. USC Mech Version II. High-temperature combustion reaction model of H_(2)/CO/C_(1)–C_(4) compounds[DB/OL]. (2007–05–01)[2025–08–15]. http://ignis.usc.edu/USC＿Mech＿II.htm.
[17] Kim H J， Van K， Lee D K， et al. Laminar flame speed， markstein length， and cellular instability for spherically propagating methane/ethylene-air premixed flames[J]. Combustion and Flame， 2020， 214: 464–474.
[18] Wang Tao， Luo Zhenmin， Wen Hu， et al. The explosion enhancement of methane-air mixtures by ethylene in a confined chamber[J]. Energy， 2021， 214: 119042.
[19] Liu Litao， Luo Zhenmin， Eckart S， et al. Investigation of C_(2)H_(6)， C_(2)H_(4)， CO and H_(2) on the explosion pressure behavior of methane/blended fuels[J]. International Journal of Hydrogen Energy， 2023， 48(72): 27978–27991.
[20] Chen Shanshan， Jiang Yong， Qiu Rong， et al. Numerical study on laminar burning velocity and flame stability of premixed methane/ethylene/air flames[J]. Chinese Journal of Chemical Engineering， 2012， 20(5): 914–922.
[21] Yang Fan， Liu Yu， Wang Jingsong， et al. CO substitution for CH_(4 )and H_(2) in CH_(4)/H_(2)-air combustion: effects on flame characteristics， OH/CH radical kinetics， and NO_(x) emissions[J]. Fuel， 2026， 404: 136175.
Basic Information:
DOI：10.13637/j.issn.1009-6094.2025.1864
China Classification Code:X932
Citation Information:
[1]Dong Bingyan,Chen Weiye,He Junwen ,et al.Explosion characteristics of methane-ethylene mixtures and CO? suppression research[J].Journal of Safety and Environment().DOI:10.13637/j.issn.1009-6094.2025.1864.
2026-08-11
2026-08-11
2026-08-11