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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Numerical simulation of the combustion characteristics and NOx emission of a swirl burner: Influence of the structure of the burner outlet
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Numerical simulation of the combustion characteristics and NOx emission of a swirl burner: Influence of the structure of the burner outlet

机译：旋流燃烧器燃烧特性和NOx排放的数值模拟：燃烧器出口结构的影响

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摘要

Numerical simulations on coal combustion and NOx emissions were performed for a centrally fuel-rich pulverized-coal swirl burner. By varying cone lengths of primary air, inner secondary air and outer secondary air, the burner outlet structure effect was disclosed in detail. The new findings which can deepen the understanding of the swirl burner performance are as follows. The ignition performance and NOx reduction capacity of burner increases as primary air cone length decreases. As the inner secondary air cone length increased, ignition performance of burners becomes poor and the NOx reduction capacity increases. The ignition performance and NOx reduction capacity of burners become stronger with increases in outer secondary air cone length. Under the conditions including that (i) outer secondary air cone length is three times of the outer secondary air duct diameter, (ii) inner secondary air cone length is 50-100% of outer secondary air cone length and (iii) primary air cone length is 0 mm, the burner presents an excellent performance on NOx emissions and pulverized-coal combustion characteristics with air-staging conditions. (C) 2016 Elsevier Ltd. All rights reserved.
机译：对中央富燃料的粉煤旋流燃烧器进行了煤燃烧和NOx排放的数值模拟。通过改变一次空气，内部二次空气和外部二次空气的锥体长度，详细公开了燃烧器出口结构的效果。可以加深对旋流燃烧器性能的了解的新发现如下。燃烧器的点火性能和NOx还原能力随着初级空气锥长度的减小而增加。随着内部二次空气锥体长度的增加，燃烧器的点火性能变差并且NOx还原能力增加。随着外部二次空气锥体长度的增加，燃烧器的点火性能和NOx还原能力变得更强。在以下条件下：（i）外部二次空气锥长度是外部二次空气导管直径的三倍;（ii）内部二次空气锥长度是外部二次空气锥长度的50-100％，并且（iii）一次空气锥长度为0毫米时，燃烧器在空气分级条件下表现出出色的NOx排放和粉煤燃烧特性。 （C）2016 Elsevier Ltd.保留所有权利。

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