CIESC Journal ›› 2021, Vol. 72 ›› Issue (11): 5883-5892.DOI: 10.11949/0438-1157.20211129

• Process safety • Previous Articles    

Study on enhancing flame stability using zirconia-based coating walls

Fan LI1(),Aolin JIANG2,Haolin YANG1(),Xiaojun ZENG1,Liqiao JIANG1,Xiaohan WANG1   

  1. 1.Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China
    2.Funan Commercial Grain Bureau, Fuyang 236300, Anhui, China
  • Received:2021-08-06 Revised:2021-09-01 Online:2021-11-12 Published:2021-11-05
  • Contact: Haolin YANG

氧化锆基涂层壁面改善火焰稳定性研究

李凡1(),姜奥林2,杨浩林1(),曾小军1,蒋利桥1,汪小憨1   

  1. 1.中国科学院广州能源研究所,广东 广州 510640
    2.阜南县商务粮食局,安徽 阜阳 236300
  • 通讯作者: 杨浩林
  • 作者简介:李凡(1992—),男,博士,lifan@ms.giec.ac.cn
  • 基金资助:
    广州市科技计划项目(201903010019);广东省重点领域研发计划项目(2020B1111360004)

Abstract:

From the perspective of controlling the thermal and chemical properties of the combustion chamber wall, this paper uses atmospheric plasma spraying technology to prepare two ceramic coating walls, ZrO2 and ZrO2+Al2O3, and studies coating material effects on the flame characteristic of methane/air mixtures in a narrow channel based on the planar laser induced fluorescence technique. Coating characterization shows that thermal spraying treatment can realize partial Al-Zr solid solution, and increases the oxygen content distributed on the surfaces. Mixing Al2O3 also renders a larger thermal conductivity of the coating wall and then enhances streamwise heat conduction. Finally, slot combustion tests confirm that using ZrO2+Al2O3 coating wall can effectively reduce the quenching distance and show a better flame stability under various wall temperatures and equivalence ratios rather than pure ZrO2 case. In particular, as the wall temperature increases and channel spacing decreases, the OH radical concentration in the close vicinity of ZrO2+Al2O3 coating wall and in flame core areas are both elevated significantly.

Key words: ZrO2+Al2O3 coating, OH-PLIF, lattice oxygen, quenching distance, enhanced stable combustion

摘要:

从调控燃烧室壁面热和化学性能角度出发,利用大气等离子喷涂技术制备了ZrO2和ZrO2+Al2O3两种陶瓷涂层壁面,并结合OH平面激光诱导荧光(OH-PLIF)技术研究了涂层材料对平板通道内甲烷/空气预混火焰特性的影响。涂层材料表征结果显示,高温热喷涂能使混合材料内部形成部分Zr-Al固溶体,表面分布的晶格氧含量明显增加。ZrO2基混合材料热导率的增加也会增强流向导热作用。狭缝燃烧实验证实相比使用纯ZrO2涂层,混合一定量Al2O3在不同壁温、当量比条件下均能有效降低火焰淬熄间距,表现出更好的燃烧稳定性。特别是随着壁温升高、通道间距缩小,ZrO2+Al2O3近壁面区域以及火焰核心区OH基浓度均显著提高。

关键词: 氧化锆+氧化铝涂层, OH-PLIF, 晶格氧, 淬熄间距, 强化稳燃

CLC Number: