CO emission from an impinging non-premixed flame

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• 作者：Yu-Chien Chien ; ^{chieny@uci.edu" class="auth_mail" title="E-mail the corresponding author} ; David Escofet-Martin ; Derek Dunn-Rankin
• 关键词：Carbon monoxide ; Impinging flame ; Diffusion flame ; OH PLIF ; CO PLIF
• 刊名：Combustion and Flame
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：174
• 期：Complete
• 页码：16-24
• 全文大小：2182 K

文摘

Carbon monoxide (CO) results from the incomplete oxidation of hydrocarbon fuels. While CO can be desirable in some syngas processes, it is a dangerous emission from fires, gas heaters, gas stoves, or furnaces where insufficient oxygen in the core reaction prevents complete oxidation of fuel to carbon dioxide and water, particularly when the reaction is interrupted by interaction with relatively cool solid boundaries. This research examines the physico-thermo-chemical processes responsible for carbon monoxide release from a small laminar non-premixed methane/air flame impinging on a nearby surface. We measure the changes in CO emission as correlated with variations in flame structure observed using planar laser induced fluorescence (PLIF of OH and 2-photon CO), and two-line OH PLIF thermometry, as a function of burner-to-plate distance. In particular, this work combines the use of OH and CO PLIF, and PLIF thermometry to describe the relative locations of the CO rich region, the peak heat release zone as indicated by chemiluminescence and OH gradients, and the extended oxidative zone in the impinging flames. The results show that CO release correlates strongly with stagnating flow-driven changes in the location and extent of high concentration regions of OH in surface-impinging diffusion flames.