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主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
超临界墙式切圆锅炉低负荷燃烧特性
  • Title

    Low load combustion characteristics of supercritical wall type tangentially fired boiler

  • 作者

    尤默陈磊尚勇高爱国苏胜向军

  • Author

    YOU Mo;CHEN Lei;SHANG Yong;GAO Aiguo;SU Sheng;XIANG Jun

  • 单位

    国网冀北电力有限公司 华北电力科学研究院有限责任公司华中科技大学煤燃烧国家重点实验室

  • Organization
    North China Electric Power Research Institute Co.,Ltd.,State Grid Jibei Electric Power Co.,Ltd.
    State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology
  • 摘要

    在新能源大规模消纳及国家双碳目标背景下,实现锅炉低负荷稳定燃烧对火力发电机组深度灵活调峰具有重要意义。以国内某660MW超临界墙式切圆燃烧煤粉锅炉为研究对象,对锅炉进行了低负荷下多工况燃烧特性的数值模拟及试验验证,研究了不同燃烧组织方式对炉内燃烧气流速度、温度及氧浓度分布特性的影响。通过对燃烧器区域进行加密网格划分,提高模拟结果的准确性,数值模拟结果与试验结果偏差较小,说明其模拟结果可信。研究结果表明:30%低负荷下,墙式切圆锅炉通过开启底层燃烧器并进行合理配风,煤粉在炉内能形成良好的切圆流场并增加停留时间;同时,通过适当增加运行燃烧器的间距,能够实现炉内部热负荷分布均匀,为锅炉超低负荷下稳定燃烧提供了有利条件。结果表明,模拟提出的墙式切圆锅炉燃烧组织与运行策略合理,可保证锅炉30%低负荷下稳定燃烧及各项主蒸汽参数达到运行要求,结果为该类型超临界机组深度灵活调峰运行提供基础与依据。

  • Abstract

    With the increasing demand for new energy consumption and the national target of double carbon reduction, the stable combustion of boilers under low load conditions is of great significance for the deep and flexible peaking operation of thermal power generatingunits. The numerical simulation and experimental verification of the combustion characteristics of a 660 MW supercritical wall type tangentially combustion pulverized coal boiler under multiple operating conditions at low load were conducted. The impact of different combustionstructures on the distribution characteristics of velocity, temperature, and oxygen concentration in the furnace were studied. By discretizingthe combustion zone with a refined mesh, the accuracy of the simulation results is improved. The deviation between the numerical simulation results and the experimental results is small, indicating that the simulation results are reliable. The results show that a good circularflow field of coal powder can be established and the residence time can be increased by opening the bottom burners and adjusting the airdistribution under 30% ultra-low load. Additionally, by properly increasing the distance between operating burners, the uniform distribution of heat load inside the furnace can be achieved, providing favorable conditions for the safe combustion of boiler under low load. Theexperimental results verify that the proposed combustion structure and operation strategy for the wall type tangentially fired boiler are reasonable, which can ensure stable combustion and meet various main steam parameters at 30% low load. The results can provide a basisand reference for the deep flexiblity operation of this type of ultra-supercritical unit.

  • 关键词

    墙式切圆锅炉低负荷燃烧组织配风方式数值模拟

  • KeyWords

    wall-type tangential boiler;low load;combustion organization;air distribution;numerical simulation

  • 基金项目(Foundation)
    国家重点研发计划资助项目(2022YFB4100801)
  • 文章目录

    0 引言

    1 研究对象

    2 数值计算方法

       2.1 建模与网格划分

       2.2 模型与边界条件

       2.3 模型验证

       2.4 锅炉低负荷模拟工况参数

    3 结果与分析

       3.1 速度场分布

       3.2 温度场分布

       3.3 氧浓度分布

       3.4 低负荷稳定燃烧特性分析

       3.5 锅炉低负荷燃烧性能试验验证

    4 结论


  • DOI
  • 引用格式
    尤默,陈磊,尚勇,等.超临界墙式切圆锅炉低负荷燃烧特性[J].洁净煤技术,2023,29(10):145-152.
  • Citation
    YOU Mo,CHEN Lei,SHANG Yong,et al.Low load combustion characteristics of supercritical wall type tangentially firedboiler[J].Clean Coal Technology,2023,29(10):145-152.
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