The thermal deformation of membrane walls is a severe safety issue in the arch-fired boilers, which is closely related to the combustion and flame inside the furnace. In this paper, various combustion schemes were conducted on a laboratory-scaled arch-fired boiler, exploring the correlations between the working status on membrane walls and the arrangement of burners. The influence mechanisms of the burners on the membrane walls were experimentally determined, with strong impact regions found on the front/rear wall in a relative wide of 0.6. The asymmetric combustion obtained in the furnace increased the temperature and strain/stress on the front wall with greater deformation risk, which should be avoided in the practical operation. The flameout of burners dramatically changed the local temperature and enhances the tearing risk of membrane walls with tension stress, which is consistent with the tearing track in the prototype boiler. Great correlations between the operation parameters (T_g, T_w, T_c, ε₁ and σ₁) and the and volumetric thermal load (P_v) were experimentally determined and considered applicable to the prototype boiler. While the impact range of burners helps estimating the uniformity of temperature and strain/stress on membrane walls, providing reference to the design and operation of similar boilers.

膜片壁的热变形在拱形锅炉中是一个严重的安全问题，与炉内的燃烧和火焰密切相关。在本文中，对实验室规模的拱形锅炉进行了各种燃烧方案，探讨了膜壁工作状态与燃烧器布置之间的关系。实验确定了燃烧器对膜壁的影响机理，在前/后壁上发现了强烈的冲击区域，其相对宽度为0.6。炉中获得的不对称燃烧增加了前壁的温度和应变/应力，并具有较大的变形风险，在实际操作中应避免使用。燃烧器的熄火极大地改变了局部温度，并增加了带有拉应力的膜壁的撕裂风险，这与原型锅炉的撕裂轨迹一致。操作参数之间的相关性很大（Ť_克，Ť_瓦特，Ť _Ç，ε ₁和σ ₁）和与体积热负荷（P _v）实验测定，并认为适用于原型锅炉。燃烧器的冲击范围有助于估算膜壁上温度和应变/应力的均匀性，为类似锅炉的设计和运行提供参考。