• 论文
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
基于GRI-Mech3.0机理的甲烷/空气多孔介质燃烧特性数值分析
  • Title

    Numerical analysis of CH4/air porous media combustion characteristics based on GRI-Mech 3.0 mechanism

  • 作者

    王鹏涛贾楠刘鹏中崔豫泓牛芳

  • Author

    WANG Pengtao,JIA Nan,LIU Pengzhong,CUI Yuhong,NIU Fang

  • 单位

    煤科院节能技术有限公司煤炭资源高效开采与洁净利用国家重点实验室国家能源煤炭高效利用与节能减排技术装备重点实验室

  • Organization
    China Coal Research Institute Company of Energy Conservation;State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources;National Energy Technology & Equipment Laboratory of Coal Utilization and Emission Control
  • 摘要

    多孔介质燃烧火焰相比于常规自由火焰,具有功率密度高、可燃性极限宽、燃烧速率高和污染物排放少等优点。为了探究甲烷多孔介质燃烧火焰面及污染物排放特性,采用计算流体力学方法,结合GRI-Mech 3.0机理,针对三维氧化铝小球堆积床多孔介质燃烧器内预混气体燃烧特性进行数值模拟。分析了当量比对甲烷多孔介质燃烧火焰面、燃烧反应速率以及CO和NOx排放特性的影响。结果表明,甲烷/空气多孔介质燃烧经历了预热—燃烧—燃尽3个阶段,并在主燃区达到了温度峰值以及燃烧反应速率峰值,而在主燃区后程及燃尽区内,燃烧温度趋于均匀,这是多孔介质燃烧与传统燃烧的重要区别。当量比对甲烷/空气多孔介质燃烧整体特性的影响不存在线性关系,化学当量比Φ=1.0时,整体燃烧特性较优。NO生成特性方面,受热力型NO生成机制的影响,多孔介质燃烧场内NO浓度先迅速上升,而后由于还原性气氛增强,GRI-Mech 3.0机理中涉及NO还原反应消耗了一定浓度的NO。

  • Abstract

    Compared with conventional free flame,porous medium combustion flame has higher power density,wider flammability limit,higher combustion rate and lower pollutant emission. In order to investigate the combustion flame and pollutant emission characteristics of methane porous medium,the combustion characteristics of premixed gas in three-dimensional alumina pellet porous medium burner were numerically simulated by using computational fluid dynamics (CFD) method and GRI-Mech 3.0 mechanism. The effects of equivalence ratio on flame surface,combustion reaction rate and emission characteristics of CO and NOx were analyzed. The results show that the CH4/air combustion goes through three stages:preheating-combustion-burnout,and reaches the peak of temperature and combustion reaction rate in the main combustion zone. In the second half of the main combustion zone and the burn out zone,the combustion temperature tends to be uniform,which is an important difference between porous medium combustion and traditional combustion. There is no linear relationship between the effect of chemical equivalence ratio on the overall combustion characteristics of methane/air porous media,when the stoichiometric ratio is 1.0,the overall combustion characteristics are better. The NO concentration in porous media combustion field first increases rapidly due to the influence of thermal NO generation mechanism,and then a certain concentration of NO is consumed by the reduction reaction involving NO in GRI-Mech 3.0 mechanism due to the enhancement of reducing atmosphere.

  • 关键词

    多孔介质燃烧甲烷GRI-Mech 3.0反应速率燃烧污染物

  • KeyWords

    porous medium combustion;methane;GRI-Mech 3.0;reaction rate;combustion pollutant

  • 基金项目(Foundation)
    煤科院节能技术有限公司科技发展基金资助项目(2021JNCX-02)
  • 文章目录

    0 引言

    1 计算模型及网格划分

       1.1 物理模型

       1.2 网格划分及网格无关性检验

    2 计算方法

    3 燃烧模拟结果分析

       3.1 燃烧火焰形状分析

       3.2 燃烧化学反应速率特性

       3.3 燃烧污染物组分分布特性

    4 结论

  • 引用格式
    王鹏涛,贾楠,刘鹏中,等.基于GRI-Mech 3.0机理的甲烷/空气多孔介质燃烧特性数值分析[J].洁净煤技术,2022,28(4):26-32.
    WANG Pengtao,JIA Nan,LIU Pengzhong,et al.Numerical analysis of CH4/air porous media combustion characteristics
    based on GRI-Mech 3.0 mechanism[J].Clean Coal Technology,2022,28(4):26-32.
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