Development of a Manufacturing Process of Biomass Solid Fuel with Wasted Coffee Beans and its CO_2 Assessment

概要

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A new manufacturing process of biomass solid fuel derived from wasted coffee beans and wasted plastics was proposed in this study. A biomass sample and wasted plastics were used discharged from the certain coffee beans processing factory. At the biomass proportion of 60wt% the calorific value was 29,750 kJ/kg and corresponded to sub bituminous coal. The contents of water, ash and chlorine were 5.08wt%, 4.00wt% and 0.14wt%, respectively and these values satisfied the acceptable standard of RPF in a papermaking company. In the CO2 assessment, the amount of discharged CO2 of biomass solid fuel was calculated by fixing the functional unit and the calculated data were compared with the amount of discharged CO2 of coal for fuel. When biomass and wasted plastics are mixed at the mixture ratio of 60 to 40 and is manufactured by 1 ton/hour, CO2 is generated at the amount of 0.108 tons/hour. Concerning transportation, the distance between the place where wastes are generated and the manufacturing place of biomass solid fuel was fixed to be 200 km. Consequently CO2 of 0.0523 tons is generated in the raw material transportation. The combustion of this material must emit CO2 of 0.412 tons. As the final results, it was found that CO2 of about 0.999 tons can be reduced comparing combustion of coal for power generation when 1 ton of biomass solid fuel is manufactured and combusted.
環境資源工学会の論文
2009-04-05