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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/88428
標題: | 柑橘果樹剩餘資材之碳匯潛力與經濟價值評估 Assessment of The Carbon Removal Potential and Economic Value of Residue Branches of Citrus Fruit Tree |
作者: | 賴彥銘 Yen-Ming Lai |
指導教授: | 邱祈榮 Chyi-Rong Chiou |
關鍵字: | 剩餘資材,生物炭,碳匯,熱裂解, Residue Materials,Biochar,Carbon Sequestration,Fast Pyrolysis, |
出版年 : | 2023 |
學位: | 碩士 |
摘要: | 台灣於2021年宣布2050淨零排放目標,並且在淨零轉型路徑中強調負碳技術是補足淨零排放的一環。同時,我國也積極發展再生能源,落實能源轉型願景。在減碳與增能之架構下,農業廢棄物是解決問題的潛在方法。果樹農業剩餘資材由於缺乏妥善處理方式,經常被露天焚燒,造成空氣汙染。然而,將修剪之廢棄枝條以循環經濟之概念用於熱裂解可以產生生物炭、生質油和生質氣,用於創造碳匯並產生生質能。
過往之生物炭碳匯研究缺乏一致認可之生物炭碳匯計算方法。此外,亦未有研究評估系統之成本與產出,藉此了解循環經濟模式的具體可行性。因此,本研究期望透過評估雲林柑橘枝條熱裂解之碳匯潛力與整體之經濟價值,了解果樹農業剩餘資材對於台灣淨零轉型與能源轉型之助益。雲林縣每年產出約7,000公噸之乾燥柑橘枝條,經快速熱裂解後可產生1,400公噸之生物炭、4,200公噸生質油、1,400公噸生質氣。生物炭每年可以減少2,344公噸二氧化碳當量排放,但是快速熱裂解之過程與運輸距離的變動對整體之碳匯有較大影響。在經濟價值方面,以15年為營運週期,雲林柑橘枝條快速熱裂解系統之淨現值為1.02億元,內部報酬率為1.28%,還本期約需要9年。在這之中,熱裂解設備成本和再生能源躉購費率對於系統之經濟價值影響較大。最後,系統至少每年需要處理5,453公噸之乾燥柑橘枝條才能達到損益平衡,而雲林縣之柑橘枝條產量足夠供應系統運作。 Taiwan announced its net-zero emissions target for 2050 in 2021, and stated that negative carbon technologies are essential to achieve net-zero emissions. At the same time, Taiwan is developing renewable energy for energy transition. Within the framework of carbon reduction and increased renewable energy, agricultural residue resource presents a potential solution. Utilizing pruned waste branches through fast pyrolysis can produce biochar, bio-oil, and bio-gas, which contribute to carbon sequestration and generating bioenergy. Previous research on biochar carbon sequestration lacks a universally recognized calculation method. Additionally, there has been no study assessing the costs and outputs of the system to understand the feasibility of the circular economy model. Therefore, this study aims to evaluate the carbon removal potential and economic value of pyrolysis of citrus branches in Yunlin County. Yunlin County produces approximately 7,000 metric tons of dried citrus branches annually, which, through fast pyrolysis, can generate 1,400 metric tons of biochar, 4,200 metric tons of bio-oil, and 1,400 metric tons of bio-gas. The biochar can reduce CO2 equivalent emissions by 2,344 metric tons annually, but it is sensitive to the variability in the pyrolysis process and transportation distance. In terms of economic value, with a 15-year operational period, the net present value of the Yunlin citrus branch fast pyrolysis system is 102 million NT dollars, with an internal rate of return of 1.28%, and a payback period of approximately 9 years. The costs of the pyrolysis equipment and the rate of purchasing renewable energy have a greater impact on the economic value of the system. Finally, the system needs to process at least 5,453 metric tons of dried citrus branches annually to achieve break-even, and the citrus branch production in Yunlin County is sufficient to supply the system. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/88428 |
DOI: | 10.6342/NTU202302188 |
全文授權: | 同意授權(限校園內公開) |
顯示於系所單位: | 氣候變遷與永續發展國際學位學程(含碩士班、博士班) |
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