Effect of the Shape of SCR Reaction Tower and the Internal Guiding Plates on the Airflow Uniformity

Selective Catalytic Reduction (SCR) technology is currently the most widely used DeNO x technology in coal boilers. However, the nonuniform distribution of flue gas decreases the utilization efficiency of catalysts, which leads to great economic losses, so improving the airflow uniformity in the DeNO x reaction tower has great significance. In this research, the velocity distribution of airflow in gas flue was measured in a lab-scale SCR system, and the uniformity was shown in isovelocity graphs. The results show: the airflow distribution of the wedge reaction tower was better than of the flat-top reaction tower and the transition-type reaction tower; in the range of the equivalent length Le from 0 to 0.4, the velocity distribution was more and more uniform as the increase of Le.