Numerical Simulation And Study Of SCR De-NO_x System Of Flue Gas

With the promulgation of the new emission standard of air pollutants, the flue gas denitration faces great pressure and challenges. How to improve the denitrated efficiency economically and effectively, and reduce the quantity of NO_x emission become research focuses. With the development of numerical calculation techniques, the numerical simulation becomes a means to solve these problems gradually. Effective CFD software is used to simulate the SCR De-NO_x system, which offers important parameters for the design and alteration of the mixing device and airflow distribution. It shortens engineering period and reduces blindness in experiment in SCR DE-NO_x system, which is beneficial to our environment, society, and economy.Under the equipmental conditions and development directions of our laboratory, numerical simulation methods is utilized to study mass transfer and airflow distribution in SCR De-NO_x system in this subject. Finally, this subject also explores the suitable methods and rules of numerical simulation of SCR DE-NO_x system.In this paper, the main conclusions are as follows:(1) The computational fluid dynamics software - FLUENT software, standardκ-εmodel, and multi-holes medium model are used to simulate the flow field, material transport, and pressure field of SCR DE-NO_x system, which shows reliable and rational simulation results.(2) The original model of mixer layout consisting of eight consecutive pieces causes too much pressure loss, increased fan load and higher manufacturing cost. Simulation results show that mixer layout consisting of four pieces with spacing of 250mm can achieve mixing effect and reduce pressure loss and manufacturing cost.(3) The satisfying layout model is the combination of multi-diversion. Simulation results of the model show that the flow conditions meet the requirements of operating mode. The velocity mean square root meets requirements and is close to the United States RMS standard.