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首页> 外文期刊>Fuel Processing Technology >The fate of shrinking boiler nose to improve the flow-field deflection and asymmetric combustion in a 600MW e supercritical down-fired boiler
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The fate of shrinking boiler nose to improve the flow-field deflection and asymmetric combustion in a 600MW e supercritical down-fired boiler

机译：锅炉鼻子的命运，以改善600MW的流场偏转和不对称燃烧 e 超临界下射锅炉

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AbstractThe asymmetric upper furnace configuration effect (mainly relied on the short upper furnace and large boiler nose) and unreasonable burner designs are taken as potential major factors that favoring the asymmetric combustion formation in down-fired boilers. To determine the boiler nose's role in this aspect and weaken the boiler nose's effect, two boiler nose's depth shrunk settings ofCL=0.199 and 0 were compared with the large design setupCL=0.298 within a 600MWesupercritical down-fired boiler. Numerical simulations on coal combustion were carried out for all three settings, plus full-load industrial-size measurements at the boiler's design setup. The boiler's design setup shows badly asymmetric combustion with poor burnout and high NOxemissions, corresponding to its reported, severely deflected gas/particle flow field. Shrinking boiler nose attains limited improvements (such as shortening the front/rear downward coal/air penetration difference, redirecting a little the upward gas flow towards the upper furnace central part, and shrinking the gas-flow stagnation zone below boiler nose), but unfortunately, essentially fails to change the flow-field deflection pattern and meanwhile decreases the gas fullness in the upper furnace's top zone to generate a potential threat on steam parameters. The absence of effective improvements in asymmetric combustion and apparently shortened flame penetration finally develop a worsened burnout, decreased O2at the furnace outlet, and lowered NOxemissions asCLdecreased. Findings in this work thus exclude boiler nose as a potential major factor that favoring the formation of flow-field deflection and asymmetric combustion and meanwhile, provide useful information that under the circumstances with a short upper furnace aggravating the asymmetric upper furnace configuration effect, a relatively large boiler nose should be used for maintaining (i) the boiler nose's suppression effect on the upward gas flow and (ii) gas fullness in the upper furnace's top zone.Highlights?Asymmetric combustion in down-fired boilers.?A boiler nose shrinkage numerically showing a limited asymmetric combustion improvement plus a worsened furnace performance.?Excluding boiler nose as a major factor that favoring asymmetric combustion.?A large boiler nose corresponding to relatively better furnace performance.]]>
机译：<！[cdata [ 抽象 非对称上炉配置效果（主要依赖于短的上炉和大型锅炉鼻子）和不合理的燃烧器设计被视为潜在的主要因素，有利于在燃烧锅炉中的不对称燃烧形成。为了确定锅炉鼻子在这方面的作用，削弱了锅炉鼻子的效果，两个锅炉鼻子的深度缩小 c l = 0.199和0与大型设计设置 c L = 0.298在600MW中 E 超临界下射锅炉。所有三种设置都进行了数值模拟，以及锅炉设计设置的全负荷工业大小测量。锅炉的设计设置显示速度不对称，燃烧不良，高 x 排放，对应于其报告，严重偏转气/粒子流场。收缩锅炉鼻子达到有限的改进（如缩短前/后煤/空气渗透差，重定向向上炉中央部分的向上气流，并缩小锅炉鼻下方的气流停滞区），但不幸的是，基本上未能改变流场偏转模式，同时可以降低上炉顶部区域中的气体充值，以产生对蒸汽参数的潜在威胁。在不对称燃烧中没有有效改善，显然缩短了火焰渗透率最终发育恶化的倦怠，降低了O 2 在炉子出口，降低了NO x 排放为 c l 减少。这项工作中的结果如此排除锅炉鼻子作为潜在的主要因素，主要是有利于流场偏转和不对称燃烧的形成，同时提供有用的信息，即在具有短的上炉的情况下加剧不对称的上炉配置效果，相对大型锅炉鼻部应用于维持（i）锅炉鼻子对上炉顶部区域的向上气流和（ii）气体充满度的抑制效果。 亮点 下射锅炉中的不对称燃烧。 ？ a锅炉鼻子收缩数值显示有限的不对称燃烧改善加上恶化的炉子性能。 ？ 排除锅炉鼻子作为有利于不对称燃烧的主要因素。 ？ 一个大锅炉鼻子对应于相对更好的炉子性能。 ]]>

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