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Three-dimensional computational fluid dynamics simulations are performed for a 650 ℃ grade 1 000 MW ultra-supercritical swirl-opposed firing boiler with low NOx combustion in the furnace. The flow and combustion characteristics in the furnace and the NOx concentration in the flue gas are investigated under various conditions of overfire air. It is shown that setting a staggered overfire air and injecting the lower OFA with the angle 15°downward into the furnace is helpful to reduce NOx concentration and improve the burnout rate. A lower overfire air ratio results in a higher temperature in the region of the combustor and a shorter distance between the high-temperature region and the heating surface. As the overfire air ratio increases, the NOx concentration of the flue gas at the exit of the furnace first decreases and then increases, and the optimal overfire air ratio is around 33.9%.

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针对1台650 ℃等级超超临界1 000 MW机组旋流对冲锅炉的炉内低氮燃烧问题,建立三维计算流体力学数值模拟,探究其在燃尽风变化的情况下,炉膛内流动、燃烧与传热变化以及燃尽风率对烟气中NOx体积分数的影响。结果表明:设置错位燃尽风,并将前墙低位燃尽风向下15°喷入炉膛有利于降低NOx体积分数,提高燃尽率;较低燃尽风率会造成炉内主燃区温度高、范围大,受热面与炉内高温区距离减小;炉膛出口NOx体积分数随燃尽风率增加呈现先下降再升高的变化规律,最佳燃尽风率约为33.9%。

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周科(1984),男,博士,研究员,主要研究方向为锅炉燃烧与节能环保技术,

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周科(1984),男,博士,研究员,主要研究方向为锅炉燃烧与节能环保技术,

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周科(1984),男,博士,研究员,主要研究方向为锅炉燃烧与节能环保技术,

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超超临界1 000 MW机组锅炉燃尽风对炉膛内燃烧及NOx生成特性的影响
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周科 1 , 刘明昱 2 , 陈胜军 3 , 陈晟 2
热力发电 | 发电技术论坛 2023,52(9): 138-146
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热力发电 | 发电技术论坛 2023, 52(9): 138-146
超超临界1 000 MW机组锅炉燃尽风对炉膛内燃烧及NOx生成特性的影响
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周科1 , 刘明昱2, 陈胜军3, 陈晟2
作者信息
  • 1.西安热工研究院有限公司,陕西 西安 710054
  • 2.华中科技大学煤燃烧国家重点实验室,湖北 武汉 430074
  • 3.华能(浙江)能源开发有限公司玉环分公司,浙江 台州 317604
  • 周科(1984),男,博士,研究员,主要研究方向为锅炉燃烧与节能环保技术,

Effect of overfire air on combustion and NOx formation characteristics in a 1 000 MW ultra-supercritical boiler
Ke ZHOU1 , Mingyu LIU2, Shengjun CHEN3, Sheng CHEN2
Affiliations
  • 1.Xi'an Thermal Power Research Institute Co., Ltd., Xi'an 710054, China
  • 2.Skate Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
  • 3.Huaneng (Zhejiang) Energy Development Co., Ltd., Yuhuan Branch Company, Taizhou 317604, China
出版时间: 2023-09-25 doi: 10.19666/j.rlfd.202212241
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针对1台650 ℃等级超超临界1 000 MW机组旋流对冲锅炉的炉内低氮燃烧问题,建立三维计算流体力学数值模拟,探究其在燃尽风变化的情况下,炉膛内流动、燃烧与传热变化以及燃尽风率对烟气中NOx体积分数的影响。结果表明:设置错位燃尽风,并将前墙低位燃尽风向下15°喷入炉膛有利于降低NOx体积分数,提高燃尽率;较低燃尽风率会造成炉内主燃区温度高、范围大,受热面与炉内高温区距离减小;炉膛出口NOx体积分数随燃尽风率增加呈现先下降再升高的变化规律,最佳燃尽风率约为33.9%。

旋流对冲锅炉  /  燃尽风率  /  数值模拟  /  燃烧特性  /  NOx排放

Three-dimensional computational fluid dynamics simulations are performed for a 650 ℃ grade 1 000 MW ultra-supercritical swirl-opposed firing boiler with low NOx combustion in the furnace. The flow and combustion characteristics in the furnace and the NOx concentration in the flue gas are investigated under various conditions of overfire air. It is shown that setting a staggered overfire air and injecting the lower OFA with the angle 15°downward into the furnace is helpful to reduce NOx concentration and improve the burnout rate. A lower overfire air ratio results in a higher temperature in the region of the combustor and a shorter distance between the high-temperature region and the heating surface. As the overfire air ratio increases, the NOx concentration of the flue gas at the exit of the furnace first decreases and then increases, and the optimal overfire air ratio is around 33.9%.

swirl-opposed firing boiler  /  overfire air ratio  /  numerical simulation  /  combustion characteristics  /  NOx emission
周科, 刘明昱, 陈胜军, 陈晟. 超超临界1 000 MW机组锅炉燃尽风对炉膛内燃烧及NOx生成特性的影响. 热力发电, 2023 , 52 (9) : 138 -146 . DOI: 10.19666/j.rlfd.202212241
Ke ZHOU, Mingyu LIU, Shengjun CHEN, Sheng CHEN. Effect of overfire air on combustion and NOx formation characteristics in a 1 000 MW ultra-supercritical boiler[J]. Thermal Power Generation, 2023 , 52 (9) : 138 -146 . DOI: 10.19666/j.rlfd.202212241
  • 中国华能集团有限公司总部科技项目(HNKJ20-H73)
2023年第52卷第9期
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doi: 10.19666/j.rlfd.202212241
  • 首发时间:2026-01-26
  • 出版时间:2023-09-25
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  • 修回日期:2022-12-14
基金
Science and Technology Project of China Huaneng Group Co., Ltd.(HNKJ20-H73)
中国华能集团有限公司总部科技项目(HNKJ20-H73)
作者信息
    1.西安热工研究院有限公司,陕西 西安 710054
    2.华中科技大学煤燃烧国家重点实验室,湖北 武汉 430074
    3.华能(浙江)能源开发有限公司玉环分公司,浙江 台州 317604
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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