摘要
在管式反应炉上实验研究以尿素为还原剂,以乙酸、乙酸钠为添加剂的选择性非催化还原(SNCR)低温脱硝增效性能。结果显示:在氨氮比(NSR)为1.5,氧气浓度为4%的条件下,尿素还原NO的最佳脱硝温度为950℃,在850℃~1 030℃内,SNCR脱硝效率高于60%;模拟烟气中添入200μL/L乙酸或50μL/L乙酸钠可有效提升低温条件下(650℃~800℃)SNCR的脱硝效率;低温条件下有添加剂时可适当提高氨氮比,在NSR为1.8时尿素还原剂的利用率达到最大,添加剂对SNCR脱硝效率的提升幅度随氧气浓度的升高而增大。
The SNCR low-temperature denitration synergistic performance with urea as the reducing agent and acetic acid and sodium acetate as additives was investigated on a tubular reactor.The experimental results show that under the conditions of ammonia nitrogen ratio(NSR) of 1.5 and oxygen concentration of 4%,the optimal denitration temperature for NO reduction by urea is 950 ℃,and the denitration efficiency of SNCR is higher than 60% in the range of 850 ℃-1 030 ℃.Adding 200 μL/L acetic acid or 50 μL/L sodium acetate into simulated flue gas can effectively improve the denitration efficiency of SNCR at low temperature(650 ℃-800 ℃).The ammonia-nitrogen ratio can be appropriately increased with additives at low temperature,and the utilization efficiency of urea reductant reaches the maximum when NSR is 1.8.The improvement of SNCR denitration efficiency by additives increases with the increase of oxygen concentration.
作者
张明星
罗晨
马素霞
崔志刚
ZHANG Mingxing;LUO Chen;MA Suxia;CUI Zhigang(Jinneng Datu River Cogeneration Co.,Ltd.,Lishi 033000,China;College of Electrical and Power Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《煤炭技术》
CAS
北大核心
2022年第7期228-231,共4页
Coal Technology
基金
国家重点研发计划(2020YFB0606300)
山西省重大专项(20181102010)。
关键词
选择性非催化还原
尿素
添加剂
低温脱硝
selective non-catalytic reduction
urea
additives
low temperature denitration
