CFDを用いた微粉炭バーナ内の流動および粒子挙動の解明

概要

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The pulverized coal burner developed by the previous work (Kimoto et al., J. Japan Inst. Energy, 78, 404-415 (1999)) is capable of reducing the emissions of both NOx and unburned carbon in fly ash by improving the combustion stability at a low particle load. It is equipped with a function of enhancing the concentration of pulverized coal at the burner nozzle. However, the mechanisms of thickening the pulverized coal particles are not well understood because of the complicated structure of the burner nozzle. In the present work, the mechanisms of the pulverized coal thickening at the burner nozzle are investigated through a CFD simulation using Fluent 6.2 (Fluent, Inc.) . As a result, it was shown that the strong swirl given at the inlet of burner nozzle is restrained not only by the deflector angles attached to the inner wall of burner cylinder but by the concentration control ring installed in the burner nozzle. It was also found that the thickening of pulverized coal is achieved by reducing the distance between the control ring and the burner outlet because the pulverized coal particles tend to diffuse towards the center of burner nozzle by the turbulence generated by the control ring.
日本エアロゾル学会の論文
2007-09-20