催化涂层CeO_(2)-ZrO_(2)提高平板式燃烧器火焰稳定性研究  

Enhancing the flame stability in a flat plate burner using catalytic coating of CeO_(2)-ZrO_(2)

作　　者：李凡 尹艳君 徐俊超 蒋利桥[3] 汪小憨[3] 楚化强 LI Fan;YIN Yanjun;XU Junchao;JIANG Liqiao;WANG Xiaohan;CHU Huaqiang(School of Energy and Environment,Anhui University of Technology,Ma’anshan 243002,Anhui,China;School of Chemistry and Material Engineering,Chaohu University,Hefei 238024,Anhui,China;Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China)

机构地区：[1]安徽工业大学能源与环境学院,安徽马鞍山243002 [2]巢湖学院化学与材料工程学院,安徽合肥238024 [3]中国科学院广州能源研究所,广东广州510640

出　　处：《化工学报》2025年第1期394-404,共11页CIESC Journal

基　　金：国家自然科学基金项目(52406120);安徽省自然科学基金项目(2408085QE165);广东省基础与应用基础研究基金项目(2023A1515012317)。

摘　　要：基于具有优异氧离子传输性能的CeO_(2)-ZrO_(2)涂层材料调控火焰与壁面相互作用是实现强化稳燃的一种新策略。利用平面激光诱导荧光技术研究了催化涂层CeO_(2)-ZrO_(2)和普通不锈钢(STS304)壁面对平板式燃烧器内化学当量比的甲烷/空气预混火焰性能的影响,获取了火焰形态变化特征、熄火特性以及OH自由基分布规律。研究结果表明,CeO_(2)-ZrO_(2)涂层的热-化学效应对火焰高度的影响与壁温和通道间距条件相关。该催化涂层干预下的熄火间距随壁温升高呈单调下降趋势;相比于STS304壁面,高壁温条件下火焰核心区OH基最高荧光强度值明显增长,显示出燃烧强度的大幅提升。对于通道间距为4 mm、壁温为700℃工况,不同壁面材料对应的近壁OH基浓度由高到低依次为:CeO_(2)-ZrO_(2)涂层>惰性STS304>活性STS304,这与温度补偿的化学作用因子(表征气固界面上自由基吸附失活程度)顺序恰好相反,表明催化活性CeO_(2)-ZrO_(2)涂层的使用能够大大减少近壁区域的自由基化学湮灭数量,对强化燃烧具有一定促进作用。Regulating the interaction between flame and wall based on CeO_(2)-ZrO_(2)coating material with excellent oxygen ion transport performance is a new strategy to achieve enhanced stable combustion.In this study,the effects of catalytically active CeO_(2)-ZrO_(2)coating and ordinary stainless steel(STS304)wall surfaces on the performance of methane/air premixed flames with a stoichiometric ratio in parallel channels were studied by using planar laser induced fluorescence(OH-PLIF)technology.The characteristics of flame morphology changes,flame quenching properties,and the fluorescence signal distribution of OH radicals were obtained.The results showed that the thermal and chemical effects of CeO_(2)-ZrO_(2)coating on flame height were spacing conditions.The quenching distance intervened by catalytically active coating decreased monotonically with wall temperatures increase.Compared with STS304 wall,under a high wall temperature condition,the highest OH fluorescence intensity in the flame core region showed an increasing trend,indicating a significant improvement in combustion intensity.For the condition with a channel spacing of 4 mm and a wall temperature of 700℃,the nearwall OH concentration on different wall surfaces was in the order of CeO_(2)-ZrO_(2)coating>inert STS304>reactive STS304,which was exactly opposite to the order of the temperature-compensated chemical action factors(the degree of radical deactivation at gas-solid interfaces),indicating that the modified wall surface with catalytically active CeO_(2)-ZrO_(2)coating greatly reduced the quantity of radical annihilations innear-wall regions,showing promoting effects on stable combustion.

关 键 词：CeO_(2)-ZrO_(2)催化涂层 平面激光诱导荧光 火焰-壁面相互作用 熄火间距 化学作用因子 

分 类 号：TK16[动力工程及工程热物理—热能工程]