Study on Flow Field Optimization of SCR Denitrification Reactor Based on CFD Numerical Simulation Technology

Abstract

CFD numerical simulation method was used to simulate and diagnose the flow field in SCR reactor and connecting flue. The characteristics of the smoke flow field in the system before and after the layout of the guide plate were studied. The flow field distribution and data at different positions in the calculation model were obtained, and the flow field in the system before and after the layout of the guide plate was compared. By optimizing the setting of the flow guide plate in the system, it is proved that: due to the lack of flow guide plate to correct the airflow, the flue gas velocity distribution in the flue duct section and reactor section is uneven. The uniform velocity of flue gas in SCR system can be significantly improved by proper distribution of guide plate, and the relative standard deviation of the velocity of the inlet surface of the first layer catalyst can be reduced to 4.47%. Most of the speed relative to the standard deviation of the reference section shows different degree of decrease. Layer 1 catalyst entrance section (500 mm) above the first layer of catalyst average velocity angle of absolute value reduced to 4.39°, while local position angle was still slightly larger, but had no significant effect on the whole flow field.