甲烷对合成气层流预混火焰传播特性的影响

doi:10.16265/j.cnki.issn1003-3033.2019.01.013

中国安全科学学报 ›› 2019, Vol. 29 ›› Issue (1): 74-80.doi: 10.16265/j.cnki.issn1003-3033.2019.01.013

甲烷对合成气层流预混火焰传播特性的影响

尚融雪讲师, 李刚教授, 张培红教授

东北大学火灾&爆炸防治实验室,辽宁沈阳 110819

收稿日期:2018-09-20 修回日期:2018-11-25 出版日期:2019-01-28 发布日期:2020-11-23
作者简介:尚融雪 (1987—),女,辽宁沈阳人,博士,讲师,主要从事工业爆炸机制及防治技术方面的科研和教学工作。E-mail: rongxue.shang@foxmail.com。
基金资助:
国家自然科学基金资助(51804065);国家重点研发计划(2017YFC0804703);中国博士后科学基金资助(2018M631811);中央高校基本科研业务专项资金资助(N170103007)。

Study on propagation of laminar premixed flames of syngas with CH₄ addition

SHANG Rongxue, LI Gang, ZHANG Peihong

Fire & Explosion Protection Laboratory, Northeastern University, Shenyang Liaoning 110819, China

Received:2018-09-20 Revised:2018-11-25 Online:2019-01-28 Published:2020-11-23

摘要/Abstract

摘要： 为研究甲烷对合成气层流预混火焰化学动力学特征及合成气层流预混火焰传播特性的影响,选用GRI3.0-机理,模拟研究300 K条件下含0～70% 甲烷的合成气层流预混火焰传播速度、火焰温度、反应敏感性及重要自由基浓度等。结果表明:合成气层流预混火焰传播速度、绝热火焰温度随甲烷比例的增加非线性下降,火焰传播速度峰值对应的当量比随甲烷增加显著向贫燃侧发展;富燃条件下,随着甲烷少量加入(≤30%),火焰中自由基H浓度显著下降,火焰传播速度受抑制作用显著;随着甲烷的继续增加,不足的自由基OH抑制自由基CH₃的生成,影响自由基H的消耗,削弱CH₄对层流预混火焰传播速度的抑制作用。

关键词: 合成气, 甲烷, 层流预混火焰, 敏感性分析, 化学动力学特征

Abstract: The chemical kinetics of laminar premixed flames of the coal gasification syngas varied significantly with the different volume fractions of methane. The laminar flame speeds and adiabatic flame temperatures of syngas/air mixtures with CH₄ addition (volume fraction 0-70%) in the fuels were numerically studied at 300 K using GRI 3.0-Mech. To investigate the chemical kinetics effect of CH₄ on laminar premixed flame, the sensitivities of mass burning rate of mixtures with various CH₄ addition ratios and the mole fractions of vital radicals were calculated. The numerical results show that laminar flame speed, adiabatic flame temperature and equivalence ration at the peak laminar flame speed are decreased nonlinearly with the increase of CH₄ volume fraction, that when the volume fraction of CH₄ in the fuels is not higher than 30%, the laminar flame speed decreases rapidly due to the significant reductions of H radicals for rich mixtures, and that with the further increase of CH₄ volume fraction in the mixtures, the major decline of laminar flame speed is suppressed due to the deficient of OH radicals and reduction of CH₃ radicals.

Key words: syngas, CH₄, laminar premixed flames, sensitivity analysis, chemical kinetics

中图分类号:

X932

尚融雪, 李刚, 张培红. 甲烷对合成气层流预混火焰传播特性的影响[J]. 中国安全科学学报, 2019, 29(1): 74-80.

SHANG Rongxue, LI Gang, ZHANG Peihong. Study on propagation of laminar premixed flames of syngas with CH₄ addition[J]. China Safety Science Journal, 2019, 29(1): 74-80.

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甲烷对合成气层流预混火焰传播特性的影响

Study on propagation of laminar premixed flames of syngas with CH₄ addition

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甲烷对合成气层流预混火焰传播特性的影响

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Study on propagation of laminar premixed flames of syngas with CH₄ addition