Attrition Characteristics of Korean Antracite Ash in Fluidized Bed Combustors

유동층 연소로에서 국내탄 회재의 마모 특성

  • Lee, See Hoon (Korea Institute of Energy Research, Coal Conversion Research Center) ;
  • Kim, Sang Done (Department of Biomolecular-chemical Engineering, KAIST) ;
  • Kim, Jae Sung (Power Generation Lab., KEPRI, KEPCO) ;
  • Lee, Jong Min (Power Generation Lab., KEPRI, KEPCO)
  • 이시훈 (한국에너지기술연구원 석탄전환연구센터) ;
  • 김상돈 (한국과학기술원 생명화학공학과) ;
  • 김재성 (한전 전력연구원 수화력발전연구소) ;
  • 이종민 (한전 전력연구원 수화력발전연구소)
  • Received : 2006.08.07
  • Accepted : 2006.08.29
  • Published : 2006.10.10

Abstract

In the reactor following the American standard test method (ASTM) D5757-95 and lab-scale fluidized bed combustor, the attrition characteristics of sand and ash of Korean anthracite were investigated. The attrition characteristics, such as particle size distribution of fly ash, attrition rate, and attrition ratio etc, were studied with variation of gas velocities. The particle attrition of ash was more active than sand which was generally used as a fluidized material and also the attrition index of ash taken by ASTM D5757-95 was 5 times higher than that of sand. The formation of fine particles continuously occurred due to particle attrition with increasing gas velocities. The following equation has been suggested for attrition rate of ash. $$\frac{dW}{dt}=-3.18{\times}10^{-7}(U-U_{mf})W$$.

Keywords

attrition;ash;fluidized bed;combustor

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