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首页> 外文期刊>Energy Conversion & Management >Effect of overfire air angle on flow characteristics within a small-scale model for a deep-air-staging down-fired furnace
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Effect of overfire air angle on flow characteristics within a small-scale model for a deep-air-staging down-fired furnace

机译：在深空分段式炉膛小规模模型中，过火风角对流动特性的影响

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摘要

A deep-air-staging combustion technology consisting of special combustion organization and overfire air (OFA) application, has been developed previously for the particularly high NO_x emissions, severely asymmetric combustion, and serious slagging that were found in a 350 MW_e down-fired furnace. To evaluate the flow characteristics with respect to the OFA angle and thus establish an optimal OFA angle for the furnace, cold airflow experiments were conducted by recording flow field data within a l:15-scaled model of the furnace at different OFA angle settings (i.e., 30°, 35°, 40°, 45°, and 50°, respectively). Various data such as the flow field pattern, velocity distribution in the furnace throat region where OFA flows, and the decay in the OFA jet, were compared among different angle settings. No negative effect on the flow field could be found with increasing the OFA angle except for 50°. As the angle increased, the vertical reach of the OFA flow increased continually, whereas the transverse spread of OFA increased initially but then decreased in the furnace throat region. To establish a symmetric flow field along with an appropriate OFA penetration depth, an optimal setting of 40° was found for the OFA angle. Our published numerical results uncovered that applying the deep-air-staging combustion technology with the optimized OFA angle, well-formed symmetric combustion developed and NO_x emissions could be reduced by 50%, without increasing levels of carbon in fly ash.
机译：以前已经开发出一种由特殊燃烧组织和超速燃烧空气（OFA）应用组成的深空燃烧技术，用于在350 MW_e下火炉中发现特别高的NO_x排放，严重不对称燃烧和严重结渣的情况。 。为了评估相对于OFA角的流动特性，从而为炉子确定最佳的OFA角，通过在不同的OFA角设置（即， 30°，35°，40°，45°和50°）。比较了不同角度设置下的各种数据，例如流场模式，OFA流动的炉喉区域中的速度分布以及OFA射流的衰减。除50°外，随着OFA角度的增加，对流场没有负面影响。随着角度的增加，OFA流量的垂直范围会持续增加，而OFA的横向展宽最初会增加，但随后在炉喉区域减小。为了建立对称的流场以及适当的OFA穿透深度，发现OFA角的最佳设置为40°。我们发表的数值结果表明，采用具有最佳OFA角的深层空气燃烧技术，可以形成良好的对称燃烧，并减少NO_x排放50％，而不会增加飞灰中的碳含量。

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  • 来源
    《Energy Conversion & Management》 |2014年第3期|367-376|共10页
  • 作者

    Min Kuang; Zhengqi Li; Zhongqian Ling; Xinjing Jing; Qunyi Zhu;

  • 作者单位

    Institute of Thermal Engineering, China Jiliang University, Hangzhou 310018, PR China;

    School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;

    Institute of Thermal Engineering, China Jiliang University, Hangzhou 310018, PR China;

    School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;

    School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR 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

    Down-fired furnace; Deep-air-staging; Overfire air angle; Flow field; Penetration depth;

    机译：炉底炉;深空演出;过火空气角;流场穿透深度;

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