Simulation & Model Validation of Torrefaction Process and Analysis of the Fuel Properties for Pepper Stem

In this study, a mass reduction model during the torrefaction process was established and characteristics as fuel were analyzed. A naturally-dried pepper stem sample was crushed and thermogravimetric analysis was performed. Based on the experimental results, activation energy and frequency factor were induced and then the rate constant was driven. Mass decrease was predicted at 200℃, 230℃, 270℃ by mathematical model and compared with the experimental results. To investigate the properties of pepper stem as fuel, elementary analysis (EA) and Calorimetric measurement were performed. Result of elementary analysis, composition of carbon was increased from 40.11% at raw material to 57.3% at 270℃ 40min process, but case of oxygen and hydrogen, they were decreased from 35.12%, 5.7% at raw materials to 20.5%, 5.7% at 270℃ 40min process respectively. Caloric value was increased from 4,405 cal/g to 6,038 cal/g. But higher caloric value, less energy yield was shown by mass reduction during process.