低负荷下运行氧量对锅炉燃烧及NO_(x)生成特性的影响研究  

Study on the Influence of Oxygen Content on Boiler Combustion and NO_(x) Generation Characteristics Under Low Load Operation

作　　者：周尧天 ZHOU Yaotian(Shanghai Electric Power Construction Start Adjustment Testing Institute Co.,Ltd.,Shanghai 200050,China)

机构地区：[1]上海电力建设启动调整试验所有限公司,上海200050

出　　处：《电工技术》2024年第13期131-133,136,共4页Electric Engineering

摘　　要：为探究低负荷工况下运行氧量对双切圆锅炉燃烧效率及NO_(x)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NO_(x)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,NO_(x)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,NO_(x)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NO_(x)的燃烧目的。In order to explore the influence of operating oxygen levels on the combustion efficiency and NO_(x) 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 NO_(x) generation characteristics of a 1000 MW double tangential boiler under low load conditions.The simulation 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 NO_(x) 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 NO_(x).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 temperature can be maintained at a relatively good level.Considering all factors,it is recommended to control the operating oxygen content of boiler combustion at around 6.0% under low load operating conditions,in order to achieve efficient combustion and low NO_(x) generation.

关 键 词：1000MW双切圆锅炉 运行氧量 燃烧特性 NO_(x) 

分 类 号：TM611[电气工程—电力系统及自动化]