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Effects of oxygen concentration and inlet velocity on pulverized coal MILD combustion

机译：氧气浓度和进气速度对煤粉轻度燃烧的影响

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摘要

The inlet velocity is an important parameter in the Moderate or Intense Low-Oxygen Dilution (MILD) combustion. Different inlet velocities not only change the flow of the flue gas, but also affect the dilution effect of the circulating flue gas and the temperature distribution of the furnace. In coal MILD-oxy combustion, different oxygen concentrations change the amount of flue gas and inlet velocity when the excess oxygen coefficient is fixed. Therefore, the change of inlet velocity is worthy of attention in MILD-oxy combustion. In this work, the MILD combustion characteristics with different inlet velocities at different oxygen concentrations are discussed by changing the burner diameter. The results show that increasing the inlet velocity suppresses the temperature peaks in both MILD-air and MILD-oxy combustion. When the inlet velocity is fixed, the flame temperature is increased with the O_2 concentration. The facilitation of char gasification reaction with increasing oxygen concentration is also partly due to the increase of temperature and char gasification is also partially affected by the O_2 concentration. In terms of heat transfer, the inlet velocity has a large effect on convective heat transfer.
机译：进气速度是中度或强烈低氧稀释（MILD）燃烧的重要参数。不同的入口速度不仅会改变烟道气的流量，还会影响循环烟道气的稀释效果和炉子的温度分布。在煤轻度氧化燃烧中，当过剩的氧气系数固定时，不同的氧气浓度会改变烟气量和进气速度。因此，进气速度的变化在轻度氧化燃烧中值得关注。在这项工作中，通过改变燃烧器直径，讨论了在不同氧气浓度下具有不同入口速度的MILD燃烧特性。结果表明，增加进气速度会抑制MILD空气燃烧和MILD氧气燃烧中的温度峰值。当入口速度固定时，火焰温度随O_2浓度的升高而升高。随着温度升高，促进炭化反应也部分归因于温度的升高，炭化也受到O_2浓度的部分影响。在传热方面，入口速度对对流传热影响很大。

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  • 来源
    《Energy》 |2020年第may1期|117376.1-117376.15|共15页
  • 作者

    Yucheng Kuang; Boshu He; Wenxiao Tong; Chaojun Wang; Zhaoping Ying;

  • 作者单位

    Institute of Combustion and Thermal Systems School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing 100044 China;

    Institute of Combustion and Thermal Systems School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing 100044 China School of Mechanical and Power Engineering Haibin College of Beijing Jiaotong University Huanghua 061199 Hebei Province China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    MILD combustion; Oxy-fuel combustion; Inlet velocity; Char gasification; Heat transfer;

    机译：轻度燃烧;含氧燃料燃烧;进风速度焦炭气化;传播热量;

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