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Issue No.Vol. No. 1 Issue No. 2 - Publication Year 2012

AuthorKen-ichiro TonueYoshimitsu UemuraTatsuo NishimuraMiki TaniguchiKen-ichi Sasauchi

Article TitleNumerical Simulation Of Heat Transfer And Heterogenous Chemical Reactions In A Biomass Particle During Pyrolysis

From Page No.39

To Page No.47

Release Date31-12-2012

Abstract

Heat transfer and heterogeneous chemical reactions in a biomass particle during pyrolysis were investigated using numerical simulation. Theradiation heat transfer through the pores and the secondary tar cracking exhibited considerable eects on the results including theintraparticle temperature prole and the product yields. Time course of the temperature at the center of biomass particle didn’t depend onthe lignin content of the biomass. However, the higher lignin content of biomass resulted in the higher yields of tar and solid and the loweryield of gas at the setting temperatures between 673 and 1073 K. The Arrhenius plot of the maximum gas generation rate exhibited tworegimes having dierent activation energies regardless of biomass type. These two regions may be attributed to cellulose and hemicellulosedecomposition at lower temperatures and lignin decomposition at higher temperatures, respectively. The maximum gas generation ratedepended on the volume of the particle below a certain particle size (3.5 mm), and depended on the external surface area of the particle above 3.5 mm.Heat transfer and heterogeneous chemical reactions in a biomass particle during pyrolysis were investigated using numerical simulation. The radiation heat transfer through the pores and the secondary tar cracking exhibited considerable eects on the results including the intraparticle temperature prole and the product yields. Time course of the temperature at the center of biomass particle didn’t depend on the lignin content of the biomass. However, the higher lignin content of biomass resulted in the higher yields of tar and solid and the lower yield of gas at the setting temperatures between 673 and 1073 K. The Arrhenius plot of the maximum gas generation rate exhibited two regimes having dierent activation energies regardless of biomass type. These two regions may be attributed to cellulose and hemicellulose decomposition at lower temperatures and lignin decomposition at higher temperatures, respectively. The maximum gas generation rate depended on the volume of the particle below a certain particle size (3.5 mm), and depended on the external surface area of the particle above 3.5 mm.

 

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