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首页> 外文期刊>Environmental Science & Technology >Influence of the Oveifire Air Ratio on the NO_x Emission and Combustion Characteristics of a down-Fired 300-MW_e Utility Boiler
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Influence of the Oveifire Air Ratio on the NO_x Emission and Combustion Characteristics of a down-Fired 300-MW_e Utility Boiler

机译：Oveifire空气比对向下燃烧的300 MW_e电站锅炉NO_x排放和燃烧特性的影响

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摘要

Down-fired boilers used to bum low-volatile coals have high NO_x emissions. To find a way of solving this problem, an overfire air (OFA) system was introduced on a 300 MW, down-fired boiler. Full-scale experiments were performed on this retrofitted boiler to explore the influence of the OFA ratio (the mass flux ratio of OFA to the total combustion air) on the combustion and NO, emission characteristics in the furnace. Measurements were taken of gas temperature distributions along the primary air and coal mixture flows, average gas temperatures along the furnace height concentrations of gases such as O_2, CO, and NO, in the near-wall region and carbon content in the fly ash. Data were compared for five different OFA ratios. The results show that as the OFA ratio increases from 12% to 35%, the NO, emission decreases from 1308 to 966 mg/ Nm~3 (at 6% O_2 dry) and the carbon content in the fly ash increases from 6.53% to 15.86%. Considering both the environmental and economic effect, 25% was chosen as the optimized OFA ratio.
机译：用于燃烧低挥发分煤的向下燃烧的锅炉具有较高的NO_x排放量。为了找到解决此问题的方法，在300兆瓦的向下燃烧的锅炉上引入了过火空气（OFA）系统。在这种改装的锅炉上进行了全面试验，以研究OFA比率（OFA与总燃烧空气的质量通量比）对炉内燃烧和NO排放特性的影响。测量沿主要空气和煤混合物流的气体温度分布，沿炉壁近壁区域的气体（如O_2，CO和NO）浓度的平均气体温度以及飞灰中的碳含量。比较了五个不同OFA比率的数据。结果表明，随着OFA比例从12％增加到35％，NO的排放量从1308降低到966 mg / Nm〜3（在6％O_2干燥时），粉煤灰中的碳含量从6.53％升高到35％。 15.86％。考虑到环境和经济影响，选择25％作为最佳OFA比率。

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  • 来源
    《Environmental Science & Technology》 |2010年第16期|p.6510-6516|共7页
  • 作者

    FENG REN; ZHENGQI LI; ZHICHAO CHEN; SUBO FAN; GUANGKUI LIU;

  • 作者单位

    School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, PR. China;

    rnSchool of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, PR. China;

    rnSchool of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, PR. China;

    rnSchool of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, PR. China;

    rnSchool of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, PR. China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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