| Summary: | 碩士 === 國立臺灣大學 === 環境工程學研究所 === 105 === Since the decrease of fossil fuel, the development of renewable energy is concerned around the world. In this research, co-liquefaction, which is thermochical methods, was applied for transforming the waste bamboo chopsticks and tung oil into bioenergy. The affecting factors of co-liquefaction include reaction temperature(TC), reaction time(trcT), heating rate, type of materials, size of materials, initial gas in reactor and the type of catalysts. The products of co-liquefation contain bio-crude oil (BO), solid product (SP) and gas product (GP). Effects of reaction temperature, reaction time and use of catalysts on the system performance were emphasized.
The most important product of co-liquefaction is BO. At TC = 573-623 K with trcT = 0-30 min, the highest of BO yield(YBO) reached is 58.52 wt%, while the others are between 40 and 50 wt%. After adding the catalyst (γ-Al2O3), YBO decreases with the highest YBO of 46 wt%. Thus, adding the catalyst results in the vigorous decomposition of liquid intermediat products into gaseous products, reducing the YBO. However, adding catalyst makes the heating value slightly rise to 40.86 MJ/kg from 39.25 MJ/kg without adding catalyst. So adding the catalyst can lead to a big change of BO yield.
The main composition of tung oil is unsaturated fatty acid with carbon number between C16 to C20. Whether adding the catalyst or not, the results indicate that the pyrolysis is effective via co-liquefaction, cracking the BO into small fragments of low carbons. Without adding the catalyst, the fractions of components of C6 to C14 in the BO could reach about 45, 60 and 53% at 573, 603 and 623 K, respectively. They are close to that of C10 to C14 in aviation fuels which is around 61%. Howerver, the properties of BO including acid value, heating value and so on do not conform the standard of aviation fuels. Further upgrading of BO would be needed.
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