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Improvement in The Fuel Characteristics of Empty Fruit Bunch by Leaching and Wet Torrefaction

용탈처리와 습식 반탄화에 의한 Empty Fruit Bunch의 연료적 특성 향상

  • Received : 2016.01.28
  • Accepted : 2016.03.14
  • Published : 2016.05.25

Abstract

In this study, sequential leaching and wet torrefaction were performed to improve the fuel characteristics of empty fruit bunch (EFB). Leaching was carried out at $25{\sim}90^{\circ}C$ for 5~30 min. The highest ash removal efficiency of 55.99% was achieved when leaching was performed at $90^{\circ}C$ for 10 min. The ash removal efficiency was dependent more on leaching temperature than time. Wet torrefaction was carried out at $180{\sim}200^{\circ}C$ for 5~40 min, following the leaching. Most of the inorganic compounds were removed at removal efficiencies of 41.05~63.58% during sequential leaching and wet torrefaction, while silica remained in the biomass. Chloride, calcium, magnesium, and phosphorus showed more than 80% removal efficiencies. The calorific value of EFB increased to 7.96% (4730 kcal/kg) in comparison to the raw material (4390 kcal/kg) when wet torrefaction was performed at $200^{\circ}C$ for 40 min following leaching.

Keywords

empty fruit bunch;leaching;wet torrefaction;ash

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