Numerical Investigation of Flow and Flame Structures in an Industrial Swirling Inverse Diffusion Methane/Air Burner

Fire Pub Date : 2024-07-05 DOI:10.3390/fire7070237
Mengwei Sun, Yali Shao, Yu Gong, Chuanyi Xu, Tao Song, Ping Lu, Ramesh K. Agarwal
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Abstract

In this study, a novel gas burner combining air swirl and an inverse diffusion flame (IDF) is designed for industrial applications. Numerical simulations using the Reynolds-averaged Navier–Stokes (RANS) method and simplified reaction mechanisms are conducted to predict the turbulent flow and combustion performance of the burner. Detailed flow structures, flame structures and effects of burner configurations are examined. The simulation results indicate that the swirl action of the burner creates a central recirculation zone and two external recirculation zones at the burner head, which stabilize combustion. The tangential velocity is minimal at the center of the burner and decreases with increasing distance from the outlet. As the distance from the exit increases, the maximum tangential velocity gradually decreases, and the peak value shifts towards the wall. This decrease in tangential velocity with axial distance signifies the gradual dissipation of the swirl effect, which disappears near the chamber outlet. The comparisons reveal that altering the number of burner fuel nozzles is more effective in reducing NO emissions than changing the inclination angle of the fuel nozzles, in the given conditions. Favorable combustion conditions are achieved when there are 16 fuel nozzles and the nozzle inclination angle is 60°, resulting in a 28.5% reduction in NO emissions at the outlet, compared to the reference condition.
工业漩涡反向扩散甲烷/空气燃烧器中流动和火焰结构的数值研究
本研究为工业应用设计了一种结合了空气漩涡和逆扩散火焰(IDF)的新型燃气燃烧器。使用雷诺平均纳维-斯托克斯(RANS)方法和简化反应机制进行了数值模拟,以预测燃烧器的湍流和燃烧性能。研究了详细的流动结构、火焰结构和燃烧器配置的影响。模拟结果表明,燃烧器的漩涡作用在燃烧器头部形成了一个中央再循环区和两个外部再循环区,从而稳定了燃烧。燃烧器中心的切向速度最小,并随着离出口距离的增加而减小。随着离出口距离的增加,最大切向速度逐渐减小,峰值向炉壁移动。切向速度随轴向距离的增加而减小,表明漩涡效应逐渐消失,在燃烧室出口附近消失。比较结果表明,在给定条件下,改变燃烧器燃料喷嘴的数量比改变燃料喷嘴的倾角更能有效减少氮氧化物的排放。当燃料喷嘴数量为 16 个且喷嘴倾角为 60° 时,燃烧条件良好,与参考条件相比,出口处的氮氧化物排放量减少了 28.5%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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