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Numerical Study on the Evaporation Characteristics of Biocrude-oil Produced by Fast Pyrolysis

급속열분해를 통하여 생산된 바이오오일 액적의 증발 특성에 관한 수치해석적 연구

  • Received : 2016.11.11
  • Accepted : 2016.11.17
  • Published : 2016.12.10

Abstract

Biomass is regarded as one of the promising energy sources to deal with the depletion of fossil fuels and the global warming issue. Biocrude-oil can be produced through the fast pyrolysis of biomass feedstocks such as wood, crops, agricultural and forestry residues. It has significantly higher viscosity than that of conventional petroleum fuel and contains solid residues, which can lower the spray and atomization characteristics when applied to the burner. In addition, biocrude-oil consists of hundreds of chemical species derived from cellulose, hemicellulose and lignin, and evaporation characteristics of the biocrude-oil droplet are distinct from the conventional fuels. In the present study, a numerical study was performed to investigate the evaporation characteristics of biocrude-oil droplet using a simplified composition of the model biocrude-oil which consists of acetic acid, levoglucosan, phenol, and water. The evaporation characteristics of droplets were compared at various surrounding air temperatures, initial droplet diameters, and ethanol mixing ratios. The evaporation time becomes shorter with increasing air temperature, and it is much sensitive to the air temperature particularly in low temperature ranges. It was also found that the biocrude-oil droplet evaporates faster in cases of the smaller initial droplet diameter and larger ethanol mixing ratio.

Keywords

biocrude-oil;droplet;evaporation;simulation;ethanol

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Cited by

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Acknowledgement

Grant : 바이오원유 생산 고도화 활용기술 개발

Supported by : 한국기계연구원