摘要
针对烧结烟气低温、含硫、含尘的特性,可采用"湿法脱硫+湿电+GGH+热风炉+SCR"废气处理工艺流程。本文运用Aspen Plus软件,结合脱硝动力学方程,对烧结机烟气脱硝进行工艺模拟,模拟了换热器、热风炉、喷氨和脱硝塔的组合。研究表明热风炉补热量与脱硝温度无关,GGH热负荷随温升增加,由200℃升至280℃脱硝活性逐渐升高,因脱硝为放热反应,280℃~350℃脱硝效率基本不变,温度高于350℃时,脱硝效率逐渐降低,最佳脱硝温度为280℃;氨氮摩尔比由0升至2时,脱硝效率不断提高,但氨逃逸逐渐增大,最佳氨氮摩尔比为0.8~1;烟气中氧含量远高于NOx含量,氧含量由0%升至20%时,脱硝效率仅增加2.5%;气态水含量0~18%变化,脱硝效率基本不变;催化剂孔道停留时间0.2~0.28s,脱硝即可完成反应。
Due to the characteristics of low temperature, containing sulfur and dust in sintering flue gas, the waste gas treatment process of "wet desulfurization + wet electrostatic precipitator + GGH + hot balst stove + SCR" can be adopted. In this paper, the process of flue gas denitrification of sintering machine is simulated by the Aspenplus software combined with denitrification kinetics equation. Especially, the combination of heat exchanger, hot blast stove, ammonia injection and denitrification tower were simulated to study the reasonable waste gas treatment process. The results show that the heating capacity of hot blast stove has nothing to do with denitrification temperature and GGH heat load increases with the temperature rising. In addition, the denitrification activity increases as the denitrification temperature rises from 200 to 280 degrees. However, denitrification is exothermic reaction, the denitrification efficiency remains basically unchanged at 280~350 degrees centigrade. And the denitrification efficiency decreases gradually when the temperature is higher than 350 C, thus the optimal denitrification temperature is 280 degrees centigrade. Secondly, the denitrification efficiency increases continuously, and the ammonia slip increases gradually as the molar ratio of ammonia to nitrogen rises from 0 to 2, thus the optimum molar ratio of ammonia to nitrogen is 0.8-1. Thirdly, as the oxygen content in flue gas is much higher than that of NOx, the denitrification efficiency increases by only 2.5% when the oxygen content increases from 0% to 20%. And the denitrification efficiency basically remains unchanged when the gas water content changes from 0% to 18%. Lastly, the denitrification reaction can be completed at the residence time of 0.2-0.28 s.
作者
陈玉龙
吴涛
戴子剑
邹静
刘英杰
金海波
CHEN Yulong;WU Tao;DAI Zijian;ZOU Jing;LIU Yingjie;JIN Haibo(Jiangsu WELLE Environmental Co.,Ltd.,Changzhou 312125,Jiangsu,China;Changzhou ELEX Environmental Co.,Ltd.,Changzhou 213125,Jiangsu,China;Jiangsu Key Laboratory of Fine Petrochemical Engineering,Changzhou University,Changzhou 213164,Jiangsu,China)
出处
《计算机与应用化学》
CAS
北大核心
2019年第4期353-357,共5页
Computers and Applied Chemistry
关键词
Aspen
Plus
脱硝动力学
工艺模拟
换热器
热风炉
Aspen Plus
Kinetics of denitrification
Process simulation
Heater exchanger
Hot blast stove
作者简介
联系人:陈玉龙(1989-),男,江苏宿迁,硕士研究生,工程师,研究领域:废气治理,E-mail:chenyulong1124@163.com。
