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Catalytic Carbonization of Biomass and Nonisothermal Combustion Reactivity of Torrefied Biomass

바이오매스 촉매 탄화 및 반탄화 바이오매스의 비등온 연소 반응 특성

  • Bak, Young-Cheol (Department of Chemical Engineering, Engineering Research Institute, Gyeongsang National University) ;
  • Choi, Joo-Hong (Department of Chemical Engineering, Engineering Research Institute, Gyeongsang National University)
  • 박영철 (경상대학교 화학공학과, 공학연구원) ;
  • 최주홍 (경상대학교 화학공학과, 공학연구원)
  • Received : 2018.06.19
  • Accepted : 2018.08.31
  • Published : 2018.10.01

Abstract

The effects of catalysts addition on the carbonization reaction of biomass have been studied in a thermogravimetric analyzer (TGA). The sample biomasses were Bamboo and Pine. The catalysts tested were K, Zn metal compounds. The carbonization reactions were tested in the nonisothermal condition from the room temperature to $850^{\circ}C$ at a heating rate $1{\sim}10^{\circ}C/min$ on the flowing of $N_2$ purge gases. Also, the effects of catalyst on the torrefaction were tested in the temperature condition of 220, 250, $280^{\circ}C$ at 30 min. Combustion characteristic for the torrefied catalyst biomass were studied in the nonisothermal conditions of $200{\sim}850^{\circ}C$. As the results, the initial decomposition temperatures of the volatile matters ($T_i$) and the temperature of maximum reaction rate ($T_{max}$) were decreased with increasing the catalyst amounts in the sample biomass. The char amounts remained after carbonization at $400^{\circ}C$ increased with the catalyst amounts. Therefore catalysts addition can be decreased the energy for carbonization process and improved the heating value of product char. The catalysts reduced the optimum torrefaction conditions from $250^{\circ}C$ to $220^{\circ}C$. The torrefied catalyst biomass have lower activated energy from 46.5~58.7 kJ/mol to 25.1~27.0 kJ/mol in the nonisothermal combustion reaction.

Keywords

Catalyst;Carbonization;Biomass;Torrefaction;Combustion;TGA

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