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Experimental investigation of NO_x emissions in O_xycoal combustion

机译:O_xycoal燃烧过程中NO_x排放的实验研究

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摘要

This work presents the results of an experimental investigation on NO_x emissions from coal combustion in a pilot scale test facility. Three O_xidiser atmospheres have been compared, namely air, CO_2/O_2, and O_2 enriched recirculated flue gas. NO_x emissions from two different combustion modes have been studied, swirl flame and flameless combustion. The influence of the burner O_xygen ratio and the O_xidiser O_2 concentration on NO_x formation and reduction have been analysed. With increasing burner O_xygen ratio, an increase of NO_x emissions has been obtained for air and CO_2/O_2 in both, swirl flame and flameless combustion. In case of the swirl flame, flue gas recirculation leads to a reduction of NO_x emissions up to 50%, whereas in case of flameless combustion this reduction is around 40% compared to CO_2/O_2. No significant impact of the O_xidiser O_2 concentration in the CO_2/O_2 mixture on NO_x emissions is observed in the range between 18 and 27 vol.% in swirl flames. An analysis of NO_x formation and reduction mechanisms showed, that the observed reduction of NO_x emissions by flue gas recirculation cannot be attributed to the reduction of recirculated NO_x alone, but also to a reduced conversion of fuel-N to NO.
机译:这项工作介绍了在中试规模的测试设施中对煤燃烧产生的NO_x排放进行实验研究的结果。比较了三种O_xidiser气氛,即空气,CO_2 / O_2和富含O_2的再循环烟道气。已经研究了两种不同燃烧模式的NO_x排放,即旋流火焰和无焰燃烧。分析了燃烧器氧比和O_xidiser O_2浓度对NO_x生成和还原的影响。随着燃烧器氧比的增加,在旋流火焰和无焰燃烧中,空气和CO_2 / O_2的NO_x排放均增加。在旋流火焰的情况下,烟道气再循环导致NO_x排放减少多达50%,而在无焰燃烧的情况下,与CO_2 / O_2相比,这种减少约40%。在旋涡火焰中,在18%至27%(体积)范围内,未观察到CO_2 / O_2混合物中O_xidiser O_2浓度对NO_x排放的显着影响。对NO_x形成和还原机理的分析表明,观察到的烟道气再循环减少的NO_x排放量不仅可归因于再循环NO_x的减少,还不能归因于燃料N转化为NO的减少。

著录项

  • 来源
    《Fuel》 |2011年第4期|p.1604-1611|共8页
  • 作者单位

    Institute of Heat and Mass Transfer, RWTH Aachen University, Eilfschornsteinstraße 18, 52056 Aachen, Germany;

    Institute of Heat and Mass Transfer, RWTH Aachen University, Eilfschornsteinstraße 18, 52056 Aachen, Germany;

    Institute of Heat and Mass Transfer, RWTH Aachen University, Eilfschornsteinstraße 18, 52056 Aachen, Germany;

    Institute of Heat and Mass Transfer, RWTH Aachen University, Eilfschornsteinstraße 18, 52056 Aachen, Germany;

    Institute of Heat and Mass Transfer, RWTH Aachen University, Eilfschornsteinstraße 18, 52056 Aachen, Germany;

    Institute of Heat and Mass Transfer, RWTH Aachen University, Eilfschornsteinstraße 18, 52056 Aachen, Germany;

    Institute of Heat and Mass Transfer, RWTH Aachen University, Eilfschornsteinstraße 18, 52056 Aachen, Germany;

    Institute of Heat and Mass Transfer, RWTH Aachen University, Eilfschornsteinstraße 18, 52056 Aachen, Germany;

  • 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

    oyfuel; no_x; emissions; coal combustion; flameless combustion;

    机译:燃料no_x;排放燃煤无焰燃烧;

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