earticle

영어

As the Paris Convention on Climate Change takes effect as international law, Korea should reduce 37% greenhouse gases emission Business As Usual (BAU) by 2030. Because Forestry biomass is a carbon-neutral fuel and can be used for conventional thermal power plant, interest of forestry biomass have been increasing. But comparing with coal, its calorific value is low and it makes lots of impurities during combustion. So, in order to use this biomass more efficiently, torrefaction process would be suggested Torrefaction is the process which makes the energy density higher under low temperature (200℃~300℃), a relatively short time (10~60 minutes) and lean or without oxygen condition. After torrefaction process, biomass has the benefit as follows: increased calorific value of biomass, increased water resistance, and advantages of storing and transporting by mass reduction. But characteristics of biomass rely on process time and temperature and there is not enough analysis of process condition. In this study, a mass reduction and heating value prediction model during the torrefaction process was established and characteristics as fuel (hydrophobic property, calorific value) were analyzed. Using wood pellet, torrefaction experiments were performed at 200℃, 230℃, 270℃. After process, to prevent rapid reaction with oxygen, amount of mass reduction was measured after 30minutes cooling. From the experiments, 7.24~31.21% of mass reduction and 4880~5400kcal/kg of heating value were achieved under the different setting temeprtures and times. In simulation, mass reduction and heating value were observed in the range of 3.07~40.24% and 4748~6014kcal/kg respectively which were good agreement with the experimental results.