Structural Optimization And Numerical Simulation Of A New Low NO_x Burner

In order to reduce the emission of nitrogen oxides from industrial boilers,a new type of low NO_x burner was proposed.However,existing new burners often have problems such as wall slagging and excessive concentration of nitrogen oxides during use.By analyzing the existing new burners,it was found that the above phenomenon occurred due to the unreasonable size of the burner structure.Based on this problem,this paper optimizes the structure based on the existing new burner.In this paper,the SolidWorks software is used to simulate the new burner in three dimensions,and the fluid simulation software Fluent is used to simulate the pulverized coal combustion of the new burner.First,a simple model was constructed to study the effects of the outer ring of the new burner,the elevation angle and the angle of inclination of the pulverized coal ring on the airflow.Under the condition of cold flow field,the comparative analysis shows that the range of the recirculation zone gradually decreases with the increase of the angle of elevation or inclination.Under the angle of elevation angle,the swirling wind is generated in the furnace;under the angle of inclination,the direct current is generated in the furnace..Through the design of orthogonal test,the coal powder ring with different angles and the outer wind ring are combined and a three-dimensional model is established to simulate the pulverized coal combustion.The orthogonal results are analyzed to obtain the elevation angle of the through hole on the pulverized coal ring and the outer ring.For the significant influencing factors,the angle of inclination is a secondary factor,and a set of more reasonable angles is obtained.Based on a more reasonable angle scheme,the influence of the size of the premixing chamber on the combustion process of pulverized coal was analyzed,and a better premixing chamber size was obtained.Based on this,the adaptation of the new burner to the pulverized coal type was studied.And the influence of pulverized coal particle diameter on the combustion process of pulverized coal.