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首页> 美国卫生研究院文献>ACS Omega >Development of Subair Technique for CombustibilityEnhancement and NOx Reductionin a Pulverized Coal-Fired Boiler
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Development of Subair Technique for CombustibilityEnhancement and NOx Reductionin a Pulverized Coal-Fired Boiler

机译：地下空气可燃技术的发展增强和减少NOx在煤粉锅炉中

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摘要

In this work, subair injection was proposed to improve the combustibility and NOx emission in a 500 MW tangentially fired coal boiler. The location of injection ports was determined based on the coal particle trajectory and its effect was investigated numerically. The flow rate of subair was set to 0, 5, and 10% of the total combustion air. The secondary air flow rate was decreased appropriately to ensure that the total quantity of combustion air remained constant. The over-fire air was not adjusted to retain the effect of an air-staged combustion. The simulation results showed that the subair improved the combustibility of coal particles originating from burners A and B in the lower part of the furnace. Particles from other burners were not affected significantly. In addition, this method achieved reduction of NOx by 6.3 and 13.2% when the subair accounted for 5 and 10% of the combustion air, respectively. This reduction was attributed to the decrease in the peak temperature as a result of a wider combustion region. The proposed subair technique improved the coal combustibility and reduced the NOx emissions successfullyin the furnace.
机译：在这项工作中，有人建议使用空气喷射来改善500 MW切向燃烧煤锅炉的可燃性和NOx排放。根据煤粉弹道确定喷油口位置，并对其影响进行数值研究。子空气的流量设置为总燃烧空气的0％，5％和10％。适当降低二次空气流量，以确保燃烧空气总量保持恒定。过度燃烧的空气未进行调节以保留空气分级燃烧的效果。模拟结果表明，地下空气改善了来自炉下部燃烧器A和B的煤颗粒的可燃性。其他燃烧器的颗粒没有受到明显影响。此外，当次空气分别占燃烧空气的5％和10％时，此方法可将NOx减少6.3％和13.2％。这种降低归因于由于较宽的燃烧区域导致的峰值温度降低。拟议中的水下技术成功改善了煤的可燃性并减少了NOx排放在炉子里。

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