410 / 2018-12-26 10:22:27

Experimental and numerical research on a novel low-NOx swirl pulverized-coal burner

Swirl burner ; Numerical simulation ; Recirculation zone; Air distribution;Thermal test

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Experimental and numerical research on a novel low-NOx swirl pulverized-coal burner T.Shen,Q.Yu,C.Zhang,Z.Y.Song Harbin Boiler Company Limited；HeilongjiangHarbin150046；Abstract: Swirl combustion can effectively enhance the mixing process of high temperature combustion products and unburned fuels in the recirculation zone,and then form a stable ignition source, thus stabilizing the flame and also one of the effective means to reduce NOxemission.It has the advantages of compact combustion chamber structure ,good combustion flame stability ,energy saving ,high efficiency,lowpollution,high load regulation ratio of burner,and can control the shape of flame ,change theexpansionangle and range of the flame.In this paper,the aerodynamic field of the low NOx swirl burner and the air distribution of the burner in the bellows are calculated by means of numerical simulation, and the effects of different blade angles on the cold back flow zone ,the thermal NOx and CO are studied by the comparision with the experimental data.The experimental results show that the cold recirculationzone of swirl burner increases with the increase of blade angle,The air distribution of each burner in the two-time bellows is uneven, and the thermal NOx decreases with the increase of the blade angle，and increases
and then becomes stable with the increase of the opening degree of two-time damper,and increases with the increase of oxygen concentration.
Keywords:Swirl burner ; Numerical simulation ; Recirculation zone; Air distribution;Thermal test