摘要
为了进一步提高表面涂覆钒基催化剂的蜂窝型SCR反应器的脱硝性能,将蜂窝直通道结构改为扩缩形式.借助Fluent软件容积反应和多孔介质模块描述涂覆层的催化反应,建立了烟气流过蜂窝反应器脱硝过程的数值模型.为验证模型预测精度,模拟了一组直通道蜂窝反应器的烟气对流脱硝实验.借助本文模型,研究了结构和工作参数对新型蜂窝反应器脱硝性能的影响,并结合等值线云图和流线分析了扩缩通道强化脱硝的机理.结果表明:扩缩通道蜂窝SCR反应器比传统直通道结构有更高的脱硝效率(约提高10%);通道扩缩角对蜂窝脱硝性能的影响与烟气温度和雷诺(Re)数密切相关,在较高烟气温度和Re数条件下,增大扩缩角可有效提高蜂窝脱硝效率.
In order to improve the denitration performance of honeycomb-type SCR reactors coated with vanadium catalysts,the straight channels are replaced by expansion and contraction channels in the current work.A numerical model is established for the denitration process of flue gas flowing through honeycomb-type SCR reactors by using volumetric reaction and porous medium modules of Fluent package to describe the catalytic reaction in the catalyst layers.To check the accuracy of present numerical denitration model,convection denitration experiments of a honeycomb-type SCR reactor with straight channels reported in the literature are simulated.With the current model,the effects of structure and process parameters on denitration performance are studied for the new SCR reactors,and the mechanism of enhancing denitration rate with expansion and contraction channels is analyzed by means of contours and streamlines.The current work demonstrates that the new SCR reactors with expansion and contraction channels can improve denitration efficiency by about 10%compared with traditional reactors with straight channels.Besides,the effect of expansion and contraction angle on the denitration performance of SCR reactors is found to be closely related to the temperature and Re number of flue gas.Under the conditions with higher temperature and Re number,one can effectively improve the denitration efficiency of new honeycomb-type SCR reactors by increasing their expansion and contraction angles.
作者
王盛
游永华
邵坤
袁泉
胡绪满
易正明
WANG Sheng;YOU Yonghua;SHAO Kun;YUAN Quan;HU Xuman;YI Zhengming(Key Laboratory of Iron and Steel Metallurgy and Resource Utilization,Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081;National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology,Wuhan University of Science and Technology,Wuhan 430081)
出处
《环境科学学报》
CAS
CSCD
北大核心
2022年第3期393-399,共7页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.12072245)。
关键词
扩缩通道
蜂窝反应器
SCR脱硝
强化传质
数值模拟
expansion and contraction channel
honeycomb reactor
SCR denitration
mass transfer enhancement
numerical simulation
