茶滓等を180C-20MPa条件で高密度固形燃料化する技術開発

摘要

Bio-cokes,developed by Kinki University(domestic patent No.4089933),can utilize unused biomass and be used as a coal-coke substitute in large-scale industrial processes such as foundry cupola furnaces.Bio-cokes are expected to serve as a technologycorresponding to(1)reduction in the amount of the CO_2 generation for the global warming prevention;and(2)rise of the price ofcoal coke. In preliminary tests conducted at Kinki University,it was confirmed that Bio-cokes could be manufactured from various rawmaterials such as used tea leaves,wood waste,etc.This paper reports our current effort to optimize manufacturing conditions of amass-production facility of Bio-cokes.This study confirms the pressured solidification characteristics of biomass(using tea scum as the raw material)with variedparameters such as heat process temperature,smashed size,pressure,and initial water content.Thermal analysis of the materialexplains why the manufacturing process does not change material weight when setting the heat process temperature at 180°C .Theoptimum pressure for effectively obtaining a high specific gravity is constantly around 20MPa in spite of different smashed materialsizes.There is the optimum initial water content to achieve the highest specific gravity,which is very close to the value based on thetrue-densiy.