Abstract:

The nitrogen oxides produced during combustion process of the distributed energy system driven by natural gas are still difficult to satisfy the requirements of China’s increasingly stringent environment emission standard.Meanwhile,the layout of denitrification system has to be compact according to the structural of gas distributed energy system.The software Fluent is used to simulate the selective catalytic reduction and denitrification device of a buildingtype distributed energy station.Flow deflector,aerodynamic grid and airflow distribution board are briefly introduced,and 3 different improvement schemes are proposed.Quantitative analyses on the distribution of velocity,composition and temperature fields in the gas ducts are made.The results show that the flow deflector and aerodynamic grid can effectively improve the uniformity of the flow field in the mixer and the reactor.The airflow distribution board promote the uniformity of the flow field in the inlet of the first catalyst layer.Compared with the original scheme,the uniformity of velocity,mass distribution and temperature uniformity of the NO and NH3 on the first catalyst layer are improved obviously,and the velocity nonuniformity is only 20.81%, which satisfied the requirements.The results can provide reference for denitrification of buildingtype distributed energy system,and set a foundation for the following optimization design.

Key words:

">">distributed energy system, selective catalytic reduction denitrification, structural improvement, numerical simulation