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Evaluation of Bioresource Information for Decentralized Bioenergy and Establishment of Pretreatment

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The main objective of this project is to assist EPA to set up bioresource map for bioenergy, to build a mobile pelletizing pilot facility, to evaluate LCA of biomass torrefaction processes, and to evaluate feasibilities of bioenergy application in Taiwan. The waste-to-energy technology could not only solve problems of waste treatment and disposal but also produce bio-fuel which can reduce CO2 emission by the replacement of fossil fuel.. The information for the high-rate thermochemical fertilizer-making technology is also gathered and analyzed for EPA’s reference. In the final report, four main compelted works were described as following:(1) bioresource database and bioresource map have been completed. The amounts of municipal wastes, general industrial wastes, agriculture residues and forest residues were analyzed in this report. The bioenergy potential in Taiwan was estimated about 45,445.8 TJ/Y (2)the detailed design of mobile pelletizing pilot facility which includes shredding unit, pelletizing unit, bag house and transportation unit have been completed. Additionally, the rice straw and sawdust pelletizing tests have been completed. The energy consumption of two pelletized material was 177.6 kWh/ton-pellet and 261.1 kWh/ton-pellet, respectively. The characteristics of raw and pelletized rice straw and sawdust material were also analyzed such as the bulk density, the water content and the lower heating value. These results showed that the biomass pelletizing process could reduce the transportation cost of biofuels due to the bulk density of pelletized rice straw and sawdust material increases about 20 times and 3.2 times higher than the raw materials, respectively.(3)the two biomass torrefaction process scenarios for the LCA were evaluated. The first scenario suggests using natural gas for providing torrefaction heat demand. The results showed that the energy output-input ratio is about 2.99 and the net CO2 emission reduction is about 1,234.37 kg-CO2-eq/ton-biocoal. The other scenario suggests using rice pellet for providing torreaction heat demand. The results showed that the energy output-input ratio is about 4.72 and the net CO2 emission reduction is about 1,385.25 kg-CO2-eq/ton-biocoal. Therefore, both two scenarios of bio-coal are beneficial to the environment (4)the information for the high-rate thermochemical fertilizer-making technology was gathered and analyzed. It suggests that this technology has the advantages of the fast reaction rate and the efficient conversion from the bio-waste to the usable fertilizer.
Keyword
Biomass;Rice Straw;Torrefaction;Pilot Plant;Pre-treatment
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