Abstract The burner swirl intensity plays an important role in membrane wall safety and the gasification performance of pulverized coal, swirl gasifiers. The comprehensive gasification model (CGM), having two reaction regions and one radial heat transfer region, was used to simulate the influence of the swirl number (SN) on gasification performance, multiphase flow, reactions in the space, and reactions regarding the membrane wall. The results show that an SN of 0.66 is a critical point to divide low-swirl and high-swirl flows for the single-swirl-burner gasifiers of this study. Gasifier performance increases sharply with increased SN for low-swirl burners, whereas SN has little influence on gasifier performance (and multiphase flow) for high-swirl cases. In this paper, we examine the relationship between burner swirl and flow fields, temperature distributions in the space and on membrane wall, slag thickness, and the molten slag velocity distribution on the membrane wall. The influence of SN on these parameters is more remarkable at the top of the reattachment point than below it. The slag layer formed on the membrane wall isolates high-temperature gas effectively, except around the reattachment point. To guarantee gasifier performance and membrane wall safety, the burner SN should be between 0.66 and 0.9 for the single-swirl-burner gasifiers of this study.

中文翻译：

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基于综合气化模型的旋流对粉煤气化炉的影响

摘要 燃烧器旋流强度对膜壁安全和煤粉旋流气化炉的气化性能起着重要作用。采用具有两个反应区和一个径向传热区的综合气化模型 (CGM) 来模拟涡旋数 (SN) 对气化性能、多相流、空间反应和膜壁反应的影响. 结果表明，对于本研究的单旋流燃烧器气化炉，SN 为 0.66 是区分低旋流和高旋流的关键点。气化器性能随着低涡流燃烧器 SN 的增加而急剧增加，而 SN 对高涡流情况下的气化器性能（和多相流）几乎没有影响。在本文中，我们研究了燃烧器涡流和流场之间的关系，空间和膜壁上的温度分布、熔渣厚度和膜壁上的熔渣速度分布。SN 对这些参数的影响在重附着点的顶部比在其下方更显着。除重附着点周围外，膜壁上形成的渣层有效地隔离了高温气体。为了保证气化炉性能和膜壁安全，本研究的单旋流燃烧器气化炉的燃烧器 SN 应在 0.66 和 0.9 之间。除了重连点周围。为了保证气化炉性能和膜壁安全，本研究的单旋流燃烧器气化炉的燃烧器 SN 应在 0.66 和 0.9 之间。除了重连点周围。为了保证气化炉性能和膜壁安全，本研究的单旋流燃烧器气化炉的燃烧器 SN 应在 0.66 和 0.9 之间。