Interactions between gas-phase reaction and catalytic reaction in methane microscale combustion

doi:10.16085/j.issn.1000-6613.2017.06.018

Abstract

Abstract: In previous studies of CH₄ microscale catalytic combustion,CH₄ gas-phase reaction usually was not paid enough attention and even was ignored sometimes. To know the role of CH₄ gas-phase reaction playing in CH₄ microscale catalytic combustion,a simulation of CH₄/air premixed gas catalytic combustion in microscale parallel plate combustor was done in computational fluid dynamics software. CH₄ catalytic combustion inmicro scale parallel plate combustors of 0.2mm and 1mm distance were compared. The interactions between CH₄ gas-phase reaction and CH₄ catalytic reaction were investigated,and the effect of CH₄gas-phase reaction on CH₄ catalytic reaction was investigated particularly. Several regularities were revealed by simulation results. First,CH₄ gas-phase reaction was caused by CH₄ catalytic reaction in microscale parallel plate combustors of 0.2mm and 1mm distance. Second,in microscale parallel plate combustor of 0.2mm distance,OH produced from CH₄ gas-phase reaction promoted CH₄ catalytic reaction. Third,in microscale parallel plate combustor of 1mm distance,CH₄ gas-phase reaction still had positive effect on CH₄ catalytic reaction,but its negative effect was more remarkable. The results can be used to provide reference to the development of efficient and stable microscale parallel plate combustor.

Key words: catalysis, methane, microscale, simulation

摘要： 以往对甲烷微尺度催化燃烧的研究中，甲烷的气相反应往往没有受到足够的重视，有时候甚至被忽略。为了了解气相反应在甲烷的微尺度燃烧中所起的作用，本文使用了计算流体力学软件Fluent对CH₄和空气的预混气体在微尺度平板燃烧器中的催化燃烧过程进行了数值模拟，对比在0.2mm和1mm两种间距的微尺度平板燃烧器内CH₄的催化燃烧过程，研究了微尺度平板燃烧器内CH₄气相反应与CH₄催化反应的相互影响，其中重点研究了CH₄气相反应对CH₄催化反应的影响。模拟结果显示：①在间距为0.2mm和1mm 的微尺度平板燃烧器中，CH₄气相反应均是由CH₄催化反应所引起；②在0.2mm间距的微尺度平板燃烧器中，CH₄气相反应产生的OH促进了CH₄催化反应的进行；③在1mm间距的微尺度平板燃烧器中，CH₄气相反应对CH₄催化反应仍然具有促进作用，但对CH₄催化反应的抑制作用更为显著。研究结果可以为设计和开发高效稳定的微尺度平板燃烧器提供参考。

关键词: 催化, 甲烷, 微尺度, 模拟

CLC Number:

TK16

LIU Zikun, ZHOU Junhu, YANG Weijuan, WANG Yefeng, CEN Kefa. Interactions between gas-phase reaction and catalytic reaction in methane microscale combustion[J]. Chemical Industry and Engineering Progress, 2017, 36(06): 2094-2100.

刘子琨, 周俊虎, 杨卫娟, 王业峰, 岑可法. 甲烷微尺度燃烧中气相反应与催化反应间的相互作用[J]. 化工进展, 2017, 36(06): 2094-2100.

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