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首页> 外文期刊>Journal of Energy Engineering >Effects of OFA Ratio on Coal Combustion and NO_X Generation of a 600-MW Downfired Boiler after Changing Air Distribution around Fuel-Rich Flow
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Effects of OFA Ratio on Coal Combustion and NO_X Generation of a 600-MW Downfired Boiler after Changing Air Distribution around Fuel-Rich Flow

机译：富燃料流周围空气分布发生变化后，OFA比率对600兆瓦下火锅炉燃煤和NO_X生成的影响

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摘要

AbstractBoth experimentation and numerical simulations were conducted to study the effects of the overfire air (OFA) ratio on the coal combustion and NOx generation characteristics of a 600-MW downfired boiler after changing the air distribution around the fuel-rich flow. In these experiments, the arrangement of the secondary air ports close to the fuel-rich flow was adjusted to modify the air distribution around the fuel-rich flow. The air distributions in the total air duct at OFA damper openings of 30%, 40%, 50%, 70%, 80%, and 100% were calculated by numerical simulation to determine the theoretical air ratios, and these values were in good agreement with experimental results. The calculated air ratios were used as the inlet boundary conditions in subsequent simulations of the boiler thermal states. The calculated NOx emissions, carbon in fly ash, and gas temperatures in the lower furnace were also in good agreement with experimental data. Increasing the OFA damper opening from 30% to 80% generated both good flow and temperature symmetry while gradually reducing the airflow declination angles in the tertiary air regions, indicating reduced downward airflow depth. The flame kernel was also found to move upward. The OFA was readily drawn into the lower furnace at OFA damper openings below 50%, whereas larger openings gradually enhanced the OFA penetration. The corresponding experimental work demonstrated that increasing the opening from 30% to 80% increased the O2 concentration at the furnace exit from 3.02% to 3.51%, and NOx emissions were decreased from 1,337 to 735??mg/m3 at 6% O2. Reducing the outer secondary air while simultaneously increasing the secondary air ratio between the fuel-rich flow nozzles increased the carbon in fly ash from 4.93% to 5.75%. However, values of 5.94%15.1% where obtained upon increasing the OFA damper opening from 0% to 70% in conjunction with prior secondary air distribution around the fuel-rich flow. Under these conditions, the coal burnout was greatly enhanced and the lower furnace temperature and NOx emissions were slightly increased.
机译：摘要进行了实验和数值模拟，以研究在改变富燃料流周围的空气分布后，过燃空气（OFA）比率对600 MW下燃锅炉燃煤和NOx生成特性的影响。在这些实验中，调节了二次空气端口靠近富燃料流的布置，以改变富燃料流周围的空气分布。通过数值模拟计算了OFA阻尼器开口处总风管中的空气分布，分别为30％，40％，50％，70％，80％和100％，这些空气分布确定了理论空气比，这些值非常吻合具有实验结果。在随后的锅炉热态模拟中，将计算出的空气比用作入口边界条件。计算出的NOx排放量，粉煤灰中的碳以及下部炉膛中的气体温度也与实验数据非常吻合。将OFA风门的开度从30％增加到80％可以产生良好的流量和温度对称性，同时逐渐减小第三空气区域中的气流偏角，表明向下的气流深度减小。还发现火焰核向上移动。在低于50％的OFA阻尼器开口处，OFA很容易被吸入下部炉膛，而较大的开口逐渐提高了OFA的渗透率。相应的实验工作表明，将开孔率从30％增加到80％可使炉子出口处的O2浓度从3.02％增加到3.51％，并且在6％O2下NOx排放量从1,337 mg / m3降低。减少外部二次空气，同时增加富燃料流量喷嘴之间的二次空气比率，将飞灰中的碳从4.93％增加到5.75％。但是，将OFA风门的开度从0％增加到70％，再加上之前围绕富燃料流的二次空气分配，获得的值为5.94％15.1％。在这些条件下，燃煤大大增强，较低的炉温和NOx排放量略有增加。

著录项

  • 来源
    《Journal of Energy Engineering》 |2019年第1期|04018073.1-04018073.16|共16页
  • 作者

    LingyanZeng; XiaoguangLi; ShaofengZhang; JiangtaoPei; MinhangSong; ZhichaoChen; LiangWang; JiaquanWang; ZhengqiLi;

  • 作者单位

    Associate Professor School of Energy Science and Engineering Harbin Institute of Technology No. 92 West Dazhi St. Harbin 150001 China (corresponding author). ORCID: https://orcid.org/0000-0002-4583-002X. Email: zenglingyanhit@126.com;

    Ph.D. Student School of Energy Science and Engineering Harbin Institute of Technology No. 92 West Dazhi St. Harbin 150001 China. Email: stevenlee_hit@163.com;

    M.A. Student School of Energy Science and Engineering Harbin Institute of Technology No. 92 West Dazhi St. Harbin 150001 China. Email: zsfcumt@163.com;

    Senior Engineer Shenyang Academy of Environmental Sciences No. 98 Quanyun Three St. Shenyang 110167 China. Email: peijiangtao@syhky.com;

    Ph.D. Student School of Energy Science and Engineering Harbin Institute of Technology No. 92 West Dazhi St. Harbin 150001 China. Email: songminhang@126.com;

    Associate Professor School of Energy Science and Engineering Harbin Institute of Technology No. 92 West Dazhi St. Harbin 150001 China. Email: chenzc@hit.edu.cn;

    M.A. Student School of Energy Science and Engineering Harbin Institute of Technology No. 92 West Dazhi St. Harbin 150001 China. Email: 18845150328@163.com;

    M.A. Student School of Energy Science and Engineering Harbin Institute of Technology No. 92 West Dazhi St. Harbin 150001 China. Email: 17S102077@stu.hit.edu.cn;

    Professor School of Energy Science and Engineering Harbin Institute of Technology No. 92 West Dazhi St. Harbin 150001 China. Email: green@hit.edu.cn;

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  • 正文语种 eng
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  • 关键词

    Downfired boiler; Multiple injection and multiple staging; Secondary air distribution; Overfire air (OFA); Coal combustion;

    机译：下火锅炉;多次注入和多阶段;二次空气分配;过火空气（OFA）;燃煤;

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