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首页> 外文会议>US Combustion Meeting; 20070325-28; San Diego,CA(US) >Influence of CO_2 on Coal Char Combustion Kinetics in Oxy-Fuel Applications
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Influence of CO_2 on Coal Char Combustion Kinetics in Oxy-Fuel Applications

机译：氧气对CO_2对煤焦燃烧动力学的影响

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摘要

A combustion-driven entrained flow reactor equipped with an optical particle-sizing pyrometer was used to determine the combustion kinetics of pulverized coal chars when burning in both reduced oxygen and oxygen-enriched atmospheres with either a N_2 or CO_2 bath gas. This information is important for understanding and modeling the combustion of coal during oxy-fuel combustion with flue gas recycling, a promising technology for achieving carbon dioxide capture during utilization of coal for power production. Black Thunder, a western low-sulfur subbituminous coal, and Pittsburgh seam medium-sulfur bituminous coal have been investigated over oxygen concentrations ranging from 12 to 36 mole-% and gas temperatures of 1600-1750 K. For both coal chars, the particle temperatures are consistently lower, by approximately 100 ℃ for enhanced oxygen levels, for combustion in the CO_2 bath gas, implying a lower overall combustion rate. However, preliminary analysis of the data shows that the surface-specific kinetic rate of oxidation of the chars is nominally the same in the presence of CO_2 or N_2, suggesting that the decrease in the overall char burning rate in the presence of CO_2 is attributable to the ～ 20% lower rate of oxygen diffusion through the CO_2-rich boundary layer.
机译：使用配备有光学粒径筛分高温计的燃烧驱动气流床反应器，可确定还原的氧气和富氧气氛中使用N_2或CO_2浴气体在燃烧时粉煤焦的燃烧动力学。该信息对于了解和建模含氧燃料烟气与烟气再循环过程中的燃烧非常重要，烟气再循环是一种有前景的技术，可在利用煤炭发电时捕获二氧化碳。西部低硫次烟煤Black Thunder和匹兹堡煤层中硫烟煤的氧浓度范围为12至36摩尔％，气体温度为1600至1750K。为了提高氧气含量，在CO_2浴气体中燃烧，它们始终降低约100℃，这意味着较低的总体燃烧速率。然而，对数据的初步分析表明，在存在CO_2或N_2的情况下，炭的表面比氧化动力学速率名义上是相同的，这表明在存在CO_2的情况下，总体炭燃烧速率的降低归因于氧气通过富CO_2边界层的扩散速率降低了约20％。

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  • 会议地点 San DiegoCA(US)
  • 作者

    C. R. Shaddix; A. Molina;

  • 作者单位

    Combustion Research Facility, Sandia National Labs, Livermore, California 94550, USA;

    Escuela de Procesos y Energia, Facultad de Minas, Universidad Nacional de Colombia, Medellin, Colombia;

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  • 正文语种 eng
  • 中图分类 理论;
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