化工学报2019，Vol.70Issue(8)：2981-2990,10.DOI:10.11949/j.issn.0438-1157.20181438
低温烟气脱硝催化剂适用条件与动力学
Application conditions and kinetics simulation over SCR catalyst for flue gas denitrification under low temperature
摘要
Abstract
With the more stringent requirements of atmospheric pollutant emission standards, medium and low temperature catalyst would have larger market and greater challenge. In order to further clarify the application characteristics of the low temperature denitration catalyst, the denitration activity of the industrialized honeycomb catalyst was systematically investigated under different temperatures, flue gas flow rate, catalyst length and water vapor content. The applicable temperature range and kinetic parameters of the catalyst under low temperature window were also determined. These results showed that theoretical denitrification rate of NH3/NO can be achieved above 160℃ by adjustments of gas velocity and length of honeycomb catalyst. Moreover, it was found that NO conversion gradually decreased with the increase of steam content, and the negative impact become more severely below 180℃ with less than 70% DeNOx efficiency at 160℃ and 35% steam content in flue gas. According to the relationship between denitrification rate and residence time (at 2－4 m/s gas velocity), the reaction activation energy was calculated to be 22.7 kJ/mol, suggesting that the reaction is limited by the external diffusion. The industrial DeNOx demonstration of flue gas with 180000 m3/h over this catalyst exhibits more than 90% DeNOx efficiency at 180℃and promising industrialization prospect.关键词
选择性催化还原/低温催化剂/操作范围/工业示范/动力学参数Key words
SCR/ low temperature catalyst/ operating range/ industrial application/ kinetic parameters分类
化学化工引用本文复制引用
李萍,李长明,段正康,高士秋,许光文,余剑..低温烟气脱硝催化剂适用条件与动力学[J].化工学报,2019,70(8):2981-2990,10.基金项目
国家自然科学基金青年基金项目(21601192) （21601192）
中日政府间国际合作项目(2016YFE0128300) （2016YFE0128300）
多项复杂系统国家重点实验室自主研究课题项目(MPCS-2017-A-06,MPCS-2017-D-11) （MPCS-2017-A-06,MPCS-2017-D-11）
