Optimization of separated overfire air to reduce NO_x emissions under combustion stability for the retrofit of a 500 MW tangentially pulverized coal boiler

Jiang Yu; Ahn Seokgi; Oh Dong-Hun; Lee Byoung-Hwa; Jeon Chung-Hwan

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Optimization of separated overfire air to reduce NO_x emissions under combustion stability for the retrofit of a 500 MW tangentially pulverized coal boiler

机译：分离的过火空气优化，减少500 MW切向煤锅炉改造的燃烧稳定性下的NO_X排放

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Retrofitting of an aging 500 MW tangential coal-fired boiler with high pollutant emissions in South Korea was investigated to achieve low nitrogen oxide (NOX) emissions and high combustion efficiency. This study evaluated and analyzed the combustion and emission characteristics of five arrangements to optimize the position and direction of a separated overfire air (SOFA) installation using a computational fluid dynamics (CFD) simulation. The results show that the air injection of SOFA at the center of the boiler wall causes substantial obstruction of the rising airflow below, causing unstable combustion behavior in the boiler, and increasing the amount of unburned carbon (UBC). However, combining the wall injection with corner SOFA helps reduce the formation of NOX and has the effect of promoting the burnout of UBC. For the direction of the wall injection under combined conditions, a clockwise airflow helps to reduce the formation of NOX with increasing UBC. Otherwise, the counter-clockwise airflow weakens the flow rate of the ascending airflow, increasing the residence time of unburned particles, increasing the coal burnout rate, and increasing the furnace exit gas temperature (FEGT). Among the five SOFA arrangements studies, this study recommends Case 4, which has a clockwise wall SOFA (30%) with corner SOFA (70%). This case has the best performance in terms of combustibility, NOX emission, UBC, and FEGT. The proposed condition was verified through a field test, and the results indicate that NOX emissions decreased from 169 ppm to 57 ppm, the UBC content decreased from 3.64% to 0.7%, and the boiler efficiency increased by 2%.

机译：研究了韩国高500兆瓦切向燃煤锅炉的改造，实现了低氮氧化物（NOx）排放和高燃烧效率。该研究评估和分析了五种布置的燃烧和排放特性，以优化使用计算流体动力学（CFD）模拟的分离的过度空气（沙发）安装的位置和方向。结果表明，锅炉墙中心的沙发空气喷射导致下面升高的气流阻塞，在锅炉中引起不稳定的燃烧行为，并增加未燃烧的碳（UBC）的量。然而，将壁注入与角落沙发相结合有助于减少NOx的形成，并具有促进UBC倦怠的效果。对于组合条件下壁注射的方向，顺时针气流有助于减少NOx的形成随着UBC的增加。否则，逆时针气流削弱了上升气流的流速，增加了未燃烧颗粒的停留时间，增加煤燃烧率，并增加炉出口气温（FEGT）。在五个沙发安排研究中，本研究建议案例4，其具有圆形墙体沙发（30％），带有角落沙发（70％）。这种情况在可燃性，NOx排放，UBC和FEGT方面具有最佳性能。通过现场试验验证了所提出的病症，结果表明，NOx排放量从169ppm降低至57ppm，UBC含量从3.64％降至0.7％，锅炉效率增加了2％。

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来源
《Fuel》 |2021年第1期|119764.1-119764.14|共14页
作者
Jiang Yu; Ahn Seokgi; Oh Dong-Hun; Lee Byoung-Hwa; Jeon Chung-Hwan;
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作者单位

Pusan Natl Univ Sch Mech Engn Busan 46241 South Korea;

Pusan Natl Univ Sch Mech Engn Busan 46241 South Korea;

Korea Midland Power Co Boryeong Si 33439 South Korea;

Doosan Heavy Ind & Construct Corp R&D Inst Volvoro 22 Chang Won 51711 South Korea|Pusan Natl Univ Pusan Clean Coal Ctr Busan 46241 South Korea;

Pusan Natl Univ Sch Mech Engn Busan 46241 South Korea|Pusan Natl Univ Pusan Clean Coal Ctr Busan 46241 South Korea;

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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
Tangential firing boiler; Retrofit; NOX emission control; SOFA system; Clockwise/Counter-clockwise airflow;

机译：切向烧制锅炉;改造;NOx排放控制;沙发系统;顺时针/逆时针气流;

Optimization of separated overfire air to reduce NO_x emissions under combustion stability for the retrofit of a 500 MW tangentially pulverized coal boiler

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