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Numerical simulation of the combustion characteristics of a low NO_x swirl burner: Influence of the primary air pipe

机译：低NO_x旋流燃烧器燃烧特性的数值模拟：一次风管的影响

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摘要

Numerical investigations of the combustion process and NO_x emission were conducted for two swirl burners (a prototype swirl burner and an optimised swirl burner) and a 600 MWe wall-fired boiler. The predicted results and the measured information from the full-scale boiler were found to be in good agreement. The flow field, particle distribution, temperature pattern, and species concentration of two burners were discussed and analysed in detail. The species distributions in a furnace equipped with the prototype swirl burners were compared with those for optimised swirl burners. Simulation results showed that particles ejected from the prototype swirl burner diffused to the secondary air quickly, whereas particles of the optimised swirl burner recirculated for a long distance and then diffused into the secondary air passing through the recirculation zone. The gas particle field of the optimised swirl burner favours the formation of a large reducing atmosphere zone, contributing to NO_x reduction. When the prototype swirl burners were replaced by optimised swirl burners, NO_x emission decreased from 440 to 265 mg/Nm~3 at 6% O_x, but the unburnt carbon content of the fly ash increased from 1.02% to 1.33%. The detailed results of this work promotes a full understanding of NO_x formation characteristics, and helps to reduce NO_x emission in pulverised-coal furnaces.
机译：对两个旋流燃烧器（原型旋流燃烧器和优化的旋流燃烧器）和一台600 MWe壁燃锅炉进行了燃烧过程和NO_x排放的数值研究。大型锅炉的预测结果与实测信息吻合良好。讨论并分析了两个燃烧器的流场，颗粒分布，温度模式和物质浓度。将配备原型旋流燃烧器的熔炉中的物种分布与优化旋流燃烧器的物种分布进行了比较。仿真结果表明，从原型旋流燃烧器喷出的颗粒迅速扩散到二次空气中，而优化旋流燃烧器的颗粒再循环很长一段距离，然后扩散到通过再循环区域的二次空气中。优化的旋流燃烧器的气体颗粒场有利于形成大的还原气氛区，有助于NO_x的还原。当用优化的旋流燃烧器代替原型旋流燃烧器时，NO_x排放在6％O_x时从440降低到265 mg / Nm〜3，但是粉煤灰的未燃烧碳含量从1.02％增加到1.33％。这项工作的详细结果促进了对NO_x形成特性的全面理解，并有助于减少粉煤炉中的NO_x排放。

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  • 来源
    《Fuel》 |2014年第15期|168-176|共9页
  • 作者

    Hao Zhou; Yu Yang; Haize Liu; Qingjun Hang;

  • 作者单位

    State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China;

    State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China;

    State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China;

    Technical Support Department, China Resource Power (Changshu) Co. Ltd., Suzhou 215536, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Swirl burner; Primary air pipe; NO_x emission; Simulation;

    机译：旋流燃烧器;一次风管;NO_x排放;模拟;

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