우드칩 반탄화와 부생가스의 특성 분석
The Characterization of Woodchip Torrefaction and Byproduct Gas
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초록
Torrefaction is considered as a promising pre-treatment for thermochemical utilization of biomass. Torrefaction temperature and time are the criticaloperation parameters. In this study, investigated were the effects of reaction temperature and time on product composition of torrefaction. scanningelectron microscope (SEM) images and thermo gravimetric analyzer (TGA) results were also compared for the effects of the operating parameters. SEMimages showed that the pores were observed at the temperature of 250 ℃ for 30 minutes. Rapid decreases in weight were observed the temperaturebetween 200 and 400 ℃. Higher heating value of the torrefied biomass was over 5,000 kcal/kg at the temperature of 250 ℃ for 45 minutes. Energy density,which is defined as the ratio of the energy yield over the mass yield was 1.36 at the temperature of 250 ℃ for 45 minutes. The energy density was higherup to 1.6 at the temperature of 280 ℃, which indicates greater loss in mass. The major components of the gas produced in the torrefaction were CO2 andCO, with traces of methane. The total amount of gas was 31.54 l/kg and the calorific value of the gas was 1,164.4 Kcal/Nm3 at the temperature of 250 ℃for 30 minute reaction time. Based on the results of this study, the temperature of effective torrefaction is about 250 ℃ for 30 to 45 minutes of reactiontime. Considering the heating value, it is desirable to utilize the gas for efficient process of torrefaction.
Abstract
Torrefaction is considered as a promising pre-treatment for thermochemical utilization of biomass. Torrefaction temperature and time are the criticaloperation parameters. In this study, investigated were the effects of reaction temperature and time on product composition of torrefaction. scanningelectron microscope (SEM) images and thermo gravimetric analyzer (TGA) results were also compared for the effects of the operating parameters. SEMimages showed that the pores were observed at the temperature of 250 ℃ for 30 minutes. Rapid decreases in weight were observed the temperaturebetween 200 and 400 ℃. Higher heating value of the torrefied biomass was over 5,000 kcal/kg at the temperature of 250 ℃ for 45 minutes. Energy density,which is defined as the ratio of the energy yield over the mass yield was 1.36 at the temperature of 250 ℃ for 45 minutes. The energy density was higherup to 1.6 at the temperature of 280 ℃, which indicates greater loss in mass. The major components of the gas produced in the torrefaction were CO2 andCO, with traces of methane. The total amount of gas was 31.54 l/kg and the calorific value of the gas was 1,164.4 Kcal/Nm3 at the temperature of 250 ℃for 30 minute reaction time. Based on the results of this study, the temperature of effective torrefaction is about 250 ℃ for 30 to 45 minutes of reactiontime. Considering the heating value, it is desirable to utilize the gas for efficient process of torrefaction.
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