基于空气分级燃烧与SCR脱硝的燃煤锅炉NOx排放控制
NOx Emission Control of Coal-Fired Boilers Based on Fractional Air Combustion and SCR Denitrification
潘世汉 1金必都 2张溢江1
作者信息
- 1. 浙能阿克苏热电有限公司,新疆 阿克苏 843000
- 2. 浙江浙能临海海上风力发电有限公司,浙江 临海 317000
- 折叠
摘要
350 MW燃煤发电机组四角切圆锅炉在实际运行过程中,存在炉内NOx生成量大、选择性催化还原法(SCR)脱销反应器入口NOx浓度高、影响脱硝效率等问题.根据空气分级燃烧原理,在煤炭燃烧过程中控制空气的供给量,减少锅炉内NOx生成量,在此基础上运用SCR脱硝技术,进一步控制燃煤烟气中NOx的排放浓度.通过分析煤炭燃烧过程中NOx的生成特性,对燃煤锅炉进行了实验研究.实验结果表明,在常用煤种与不同锅炉负荷条件下,尤其在低负荷时,采用联合控制方法的脱硝效率达到85%,有效降低了NOx排放浓度.
Abstract
In the actual operation of the 350 MW coal-fired four-corner tangential boiler,there are some problems such as large NOx generation in the furnace and high concentration at the inlet of the SCR reactor affecting the denitration efficiency.According to the principle of air classification combustion,the supply of air is controlled during the coal combustion process to reduce the amount of NOx generated in the furnace.On this basis,SCR denitrification technology is used to further control the emission concentration of NOx in the coal flue gas.By analyzing the characteristics of NOx generation in coal combustion,the coal boiler is tested.Test results show that under the conditions of common coal and different boiler loads,especially at low loads,the denitrification efficiency reaches 85%by using the joint control method,which effectively reduces the emission concentration of NOx.
关键词
燃煤锅炉/空气分级燃烧/SCR脱硝/NOx排放浓度Key words
coal-fired boiler/air staged combustion/SCR flue gas denitration/emission concentration of NOx引用本文复制引用
出版年
2024
NETL
NSTL
万方数据