The Effect of Fluidized-Bed Variables on Attrition of Solid Particles

유동층 공정변수의 고체입자 마모에 미치는 영향

  • Moon, Young-Sub (Department of Chemical Engineering, Konkuk University) ;
  • Yi, Chang-Keun (Korea Institute Energy Research) ;
  • Son, Jae-Ek (Department of New Energy Engineering, Seoul National University of Technology) ;
  • Ryu, Chung-Keol (Korea Electric Power Research Institute) ;
  • Choi, Jeong-Hoo (Department of Chemical Engineering, Konkuk University)
  • Received : 2004.12.29
  • Accepted : 2005.08.23
  • Published : 2005.10.10

Abstract

This study was conducted to investigate particle attrition characteristics in a gas desulfurization using zinc titanate sorbent in a 0.035 m i.d. by 1.34 m height gas fluidized bed reactor. Gas jetting from the distributor and bubbling in the gas fluidized bed were found to be the main causes of particle attrition. The experiment was carried out under a slow attrition rate condition to compare the performance of the batch reactor to that of a continuous reactor. The attrition index (AI) and corrected attrition index (CAI) were measured at various the gas velocity, temperature, pressure, and bed weight, in the gas fluidized bed, during the dexulfurization process. The AI (5) and CAI (5) decreased as the bed weight increased. Particle destruction occurred when the particles started to experience physical fatigue under specific impacts over several iterations. AI (5) and CAI (5) also increased as relative humidity, gas velocity and pressure increased, and as temperature decreased. Particle attrition was mainly affected by gas jetting from the distributor, and abrasion resulted in smaller particles than fragmentation did.

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