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The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Numerical Study on 300 MW Shell-Type One-Stage Entrained Flow Bed Gasifier : Effect of Coal·Biomass Blending Ratio on CO2 Gasification

300MW급 Shell형 1단 분류층 가스화기 성능에 대한 전산수치해석 : 석탄·바이오매스 혼합비에 따른 CO2 가스화 반응

  • Received : 2012.04.03
  • Accepted : 2012.06.22
  • Published : 2012.06.30
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Abstract

Recently, gasification technology for coal blended with biomass has been an issue. Especially, An advantages of coal blended with biomass are 1) obtaining high cold gas efficiency, 2) obtaining syn-gas of high-high heating value (HHV), and 3) controlling occurrence of $CO_2$. In this study, the efficiency and characteristic of 300 MW Shell type gasifier were predicted using CFD simulation. The CFD simulation was performed for biomass coal blending ratios of 0~0.2, 0.5, 1 and $O_2$/fuel ratios of 0.5~0.84. Kinetic parameters (A, $E_a$) obtained by $CO_2$ gasification experiment were used as inputs for the simulation. In results of CFD simulation, residence times of particle in 300MW Shell type gasifer presented as 7.39 sec ~ 13.65 sec. Temperature of exit increased with $O_2$/fuel ratio as 1400 K ~ 2800 K, while there is not an effects of biomass coal blending ratios. Considering both aspects of temperature for causing wall slagging and high cold gas efficiency, the optimal $O_2$/fuel ratio and blending ratio were found to be 0.585 and 0.05, respectively.

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References

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