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http://dx.doi.org/10.15231/jksc.2016.21.4.030

Effect of Co-firing PKS and Coal on Flame Structure in a Pulverized Coal Swirl Burner  

Shin, Minho (School of Mechanical Engineering, Pusan National University)
Sung, Yonmo (School of Mechanical Engineering, Pusan National University)
Choi, Minsung (School of Mechanical Engineering, Pusan National University)
Lee, Gwangsu (Business Development Department, Korea Southern Power Co., Ltd., KOSPO)
Choi, Gyungmin (School of Mechanical Engineering, Pusan National University)
Kim, Duckjool (School of Mechanical Engineering, Pusan National University)
Publication Information
Journal of the Korean Society of Combustion / v.21, no.4, 2016 , pp. 30-38 More about this Journal
Abstract
Flame structure of co-firing coal and palm kernel shell (PKS) was investigated in a pulverized coal swirl burner by particle image velocimetry (PIV). The pulverized coal swirl flame is operated with a PKS blending ratio of 10%, 20%, and 30%. For all operating conditions, flame structures such as internal recirculation zone (IRZ), outer recirculation zone (ORZ), and exhaust tube vortex (ETV) were observed. In the center of flame, the strong velocity gradient is occurred at the stagnation point where the volatile gas combustion actively takes place and the acceleration is increased with higher PKS blending ratio. OH radical shows the burned gas region at the stagnation point and shear layer between IRZ and ORZ. In addition, OH radical intensity increases for a co-firing condition because of high volatile matter from PKS. Because the volatile gas combustion takes place at lower temperature, co-firing condition (more than 20%) leads to oxygen deficiency and reduces the combustibility of coal particle near the burner. Therefore, increasing PKS blending ratio leads to higher OH radical intensity and lower temperature.
Keywords
Flame structure; Particle image velocimetry; Swirl flame; Exhaust tube vortex; Internal recirculation;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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