Enhancing the flame stability in a flat plate burner using catalytic coating of CeO2-ZrO2

doi:10.11949/0438-1157.20240710

Abstract

Abstract:

Regulating the interaction between flame and wall based on CeO₂-ZrO₂ 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 CeO₂-ZrO₂ 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 CeO₂-ZrO₂ coating on flame height were related to wall temperature and channel 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 near-wall OH concentration on different wall surfaces was in the order of CeO₂-ZrO₂ 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 CeO₂-ZrO₂ coating greatly reduced the quantity of radical annihilations innear-wall regions, showing promoting effects on stable combustion.

Key words: CeO₂-ZrO₂ catalyst coating, planar laser induced fluorescence, flame-wall interaction, quenching distance, chemical action factor

摘要：

基于具有优异氧离子传输性能的CeO₂-ZrO₂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CeO₂-ZrO₂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，CeO₂-ZrO₂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：CeO₂-ZrO₂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CeO₂-ZrO₂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。

关键词: CeO₂-ZrO₂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

CLC Number:

TK 16

Fan LI, Yanjun YIN, Junchao XU, Liqiao JIANG, Xiaohan WANG, Huaqiang CHU. Enhancing the flame stability in a flat plate burner using catalytic coating of CeO₂-ZrO₂[J]. CIESC Journal, 2025, 76(1): 394-404.

李凡, 尹艳君, 徐俊超, 蒋利桥, 汪小憨, 楚化强. 催化涂层CeO₂-ZrO₂提高平板式燃烧器火焰稳定性研究[J]. 化工学报, 2025, 76(1): 394-404.

Figures/Tables 12

Fig.1 SEM image (a) and EDS result (b) of micron-sized CeO2-ZrO2 spherical particles

Fig.2 Photo of plasma jet

Table 1 Physical parameters of different types of wall materials

涂层壁面材料

涂层厚度/μm

表面粗糙度算术平均值/μm

材料热导率(25℃)/

（W/(m·℃)）

材料热导率

（1000℃）/（W/(m·℃)）

热膨胀系数（25~1000℃）/(10^-6℃^-1)

CeO₂-ZrO₂

Fig.3 Experimental system (a) and the equipment photos (b) for studying flame-wall interaction

Fig.4 Definition diagram (a)[16] and measurement method (b) of flame quenching distance

Fig.5 OH-PLIF images in the parallel narrow channel with varying widths at 100℃ (a) and 700℃ (b)

Fig.6 Flame heights with the presence of different wall materials

Fig.7 Variation of flame quenching distance with wall temperature for different wall materials and comparison of literature data[16,22-24]

Fig.8 Variation of the highest OH fluorescence intensity in flame core with channel width

Fig.9 Variation of heat-loss to heat-generation of flame front with different channel widths

Fig.10 Contours of the normalized OH concentration with different wall temperatures of 100℃ (a) and 700℃ (b) in a 4 mm-width flat channel

Fig.11 Variations of chemical action factor with the wall temperatures of 100℃ (a), 400℃ (b), and 700℃ (c)

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Enhancing the flame stability in a flat plate burner using catalytic coating of CeO₂-ZrO₂

催化涂层CeO₂-ZrO₂提高平板式燃烧器火焰稳定性研究

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References 32

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