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低负荷下运行氧量对锅炉燃烧及NOx生成特性的影响研究

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为探究低负荷工况下运行氧量对双切圆锅炉燃烧效率及NOx生成特性的影响,结合实际案例,对某1000 MW双切圆锅炉开展了低负荷工况下运行氧量(5.6%、6.0%、6.4%)对燃烧效率及NOx生成特性影响的模拟与试验研究.模拟结果表明:低负荷工况下,运行氧量从5.6%增加到6.0%时,锅炉燃烧飞灰含碳量显著降低,NOx浓度有所增加;进一步增加运行氧量到6.4%,锅炉燃烧飞灰含碳量降低幅度相对较小,NOx有轻微增加.现场试验结果表明:运行氧量控制在6.0%左右,锅炉燃烧飞灰含碳量较低且燃烧效率较高,汽温可维持在相对较好的水平.综合考虑,在低负荷运行条件下,建议将锅炉燃烧的运行氧量控制在6.0%左右,可达到高效低NOx的燃烧目的.
Study on the Influence of Oxygen Content on Boiler Combustion and NOx Generation Characteristics Under Low Load Operation
In order to explore the influence of operating oxygen levels on the combustion efficiency and NOx generation characteristics of a double tangential boiler under low load conditions,this paper combines practical cases and conducts simulation and experimental research on the impact of operating oxygen levels (5.6%,6.0%,6.4%)on the combustion efficiency and NOx generation characteristics of a 1000 MW double tangential boiler under low load conditions.The simu-lation results show that under low load conditions,when the operating oxygen content increases from 5.6% to 6.0%,the carbon content of boiler combustion fly ash significantly decreases and the NOx concentration increases.Further increasing the operating oxygen content to 6.4% results in a relatively small decrease in carbon content in boiler combustion fly ash along with a slight increase in NOx .The on-site test results show that the operating oxygen content is controlled at around 6.0%,the carbon content of boiler combustion fly ash is low and the combustion efficiency is high,and the steam temper-ature can be maintained at a relatively good level.Considering all factors,it is recommended to control the operating oxy-gen content of boiler combustion at around 6.0% under low load operating conditions,in order to achieve efficient combus-tion and low NOx generation.

1000 MW double tangential boileroperating oxygen levelcombustion characteristicsNOx

周尧天

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上海电力建设启动调整试验所有限公司,上海 200050

1000 MW双切圆锅炉 运行氧量 燃烧特性 NOx

2024

电工技术
重庆西南信息有限公司(原科技部西南信息中心)

电工技术

影响因子:0.177
ISSN:1002-1388
年,卷(期):2024.(13)