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首页> 外文期刊>Applied Energy >Effect of different inner secondary-air vane angles on combustion characteristics of primary combustion zone for a down-fired 300-MWe utility boiler with overfire air
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Effect of different inner secondary-air vane angles on combustion characteristics of primary combustion zone for a down-fired 300-MWe utility boiler with overfire air

机译：不同内二次风叶片角度对带过火空气的300MWe下火锅炉主燃烧区燃烧特性的影响

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摘要

To achieve significant reductions in NO emissions without increasing the levels of unburnt carbon in the fly ash, a new combustion system was applied to a 300-MWe Babcock & Wilcox (B&W) down-fired boiler installed with swirl burners. The unit featured introduced overfire air (OFA) and decreased outlet area of the inner and outer secondary-air ducts of the swirl burners. Full-scale measurements (adjusting the inner secondary-air vane angle to 35 degrees, 45 degrees, and 55 degrees) revealed that the influence of the high temperature recirculating region under the arch upon the combustion and NOx emission characteristics of the boiler is greater than that of the high-temperature flue gas entrained by the swirl burner itself. The ignition distance of the coal/air flow is reduced by at least 1.8 m compared with that of the original combustion system. For the inner secondary-air vane angle of 35 degrees, the coal/air flow ignites earlier than for the vane angles of 45 degrees and 55 degrees. The measurements of the gas species concentrations in the zone near the sidewall indicates that at inspection port 1, the coal flame of the burners does not spread across the entire furnace cross-section for all three vane angles; however, for the vane angle of 35 degrees the flame is spread across the entire furnace cross-section at inspection port 2. For this optimal (35 degrees) inner secondary-air vane angle, the NOx emissions and carbon content in the fly ash reached levels of 674 mg/m(3) (6% O-2), and 11.4%, respectively, achieving a significant NOx reduction of 51.9% without increasing the levels of unburnt carbon in the fly ash. (C) 2016 Elsevier Ltd. All rights reserved.
机译：为了显着减少NO排放而又不增加飞灰中未燃烧的碳含量，新的燃烧系统应用于安装了旋流燃烧器的300 MWe Babcock＆Wilcox（B＆W）下燃锅炉。该装置的特点是引入了过度燃烧空气（OFA），并减少了旋流燃烧器的内部和外部二次风道的出口面积。满量程测量（将内部二次风叶片角度调整为35度，45度和55度）表明，拱下的高温再循环区域对锅炉的燃烧和NOx排放特性的影响大于旋流燃烧器本身夹带的高温烟气与原始燃烧系统相比，煤/空气流的点火距离至少减少了1.8 m。对于35度的内部二次风叶片角，煤/空气流的点火要早于45度和55度的叶片角。对侧壁附近区域中气体种类浓度的测量表明，在检查口1处，燃烧器的煤焰并未在所有三个叶片角处都散布在整个炉膛横截面上。但是，当叶片角度为35度时，火焰会在检查口2的整个熔炉横截面上散布。对于此最佳（35度）内部二次空气叶片角度，粉煤灰中的NOx排放量和碳含量达到了分别达到674 mg / m（3）（6％O-2）和11.4％的水平，实现了显着的NOx降低51.9％，而又不增加飞灰中未燃烧碳的水平。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Applied Energy》 |2016年第15期|29-38|共10页
  • 作者

    Wang Qingxiang; Chen Zhichao; Che Miaomiao; Zeng Lingyan; Li Zhengqi; Song Minhang;

  • 作者单位

    Harbin Inst Technol, Sch Energy Sci & Engn, 92 West Dazhi St, Harbin 150001, Peoples R China;

    Harbin Inst Technol, Sch Energy Sci & Engn, 92 West Dazhi St, Harbin 150001, Peoples R China;

    Harbin Inst Technol, Sch Energy Sci & Engn, 92 West Dazhi St, Harbin 150001, Peoples R China;

    Harbin Inst Technol, Sch Energy Sci & Engn, 92 West Dazhi St, Harbin 150001, Peoples R China;

    Harbin Inst Technol, Sch Energy Sci & Engn, 92 West Dazhi St, Harbin 150001, Peoples R China;

    Harbin Inst Technol, Sch Energy Sci & Engn, 92 West Dazhi St, Harbin 150001, Peoples R China;

  • 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

    Down-fired boiler; Swirl burner; Vane angles; Overfire air; Pulverized coal combustion; NOx emissions;

    机译：向下燃烧的锅炉;旋流燃烧器;叶片角度;过火的空气;煤粉燃烧;NOx排放;

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