| 英文摘要 |
This study investigated biomass and the derived fuel gasification to produce syngas and clean energy using a fixed bed and fluidized bed reactor, respectively. The major objectives of this research were to (1) establish the technical characteristics and optimum operating conditions for biomass and waste-derived-fuel co-gasification; (2) enhance the syngas quality and energy conversion efficiency in biomass and waste-derived-fuel co-gasification; (3) assess the characteristics of lightweight bricks manufactured from char and water treatment plant sludge. The experiments using different biomass blends in the thermo-gravimetric test were investigated. According to the kinetic parameter analysis results, the sawdust thermo-reaction and burnout were better than those of rice husks and paper rejects derived fuel (P-RDF). The thermo-characteristics would change as one biomass was blended with another. That is, under these gasification conditions, those blends reacted at controlled interaction conditions. The biomass blending burnout characteristics decreased when the sawdust blending ratio was increased. This indicates that added sawdust could improve the gas yield in co-gasification.
The gas yield and energy production efficiency in sawdust and P-RDF gasification were discussed. The gasification temperature is a critical factor for improving the gas yield and quality. In general, a higher temperature provides more favorable conditions for thermal cracking and enhanced the gas yield and quality. In the case of the fluidized bed reactor temperature operated at 600℃, the lower heating value of syngas were higher than that of syngas produced from a fixed bed reactor. A clay containing silica and calcium oxide (CaO) were used as the gasification catalyst in this research. The catalyst effect on the gas yield and energy production efficiency was evaluated in fixed bed and fluidized bed gasification. According to the gas yield results, the catalytic gasification has good gas yield performances, lower heating value, carbon conversion rate and cold gas efficiency.
The feasibility of eco-building materials manufactured from char and water treatment plant sludge using sintering was also discussed. The experiments were conducted at a temperature of 1080℃ with char content addition varying from 10% to 40%. All sintered specimens made from char and water treatment plant sludge were in compliance with current Taiwan building bricks criteria. These results confirm the feasibility of using char and water treatment plant sludge to produce sintered construction brick.
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