Effect of Velocity Difference of Two Channels in Biased Pulverizedcoal Concentration Burners on NOx Emissions

Abstract:

Combustion in a 350MW tangentially coalfired boiler and gassolid flow of pulverizedcoal burners are simulated.The numerical results show that the velocity difference of two channels are 6~9 m·s-1 in conventional biased pulverizedcoal concentration burners.A biased pulverizedcoal concentration burner with the same velocity of two channels is proposed, NOx emissions of which is 21.8%lower than that of the conventional linear flow pulverized coal burners,11.3% lower than that of the conventional biased pulverized coal concentration burners.