木、竹廢料之生質燃料應用與儲存技術研發Research and develop on biofuel application and storage technology from woody and bamboo wastes

氣候變遷持續性地威脅全球生態環境，諸多學者紛紛提出各項指標來檢視自己國家的安全程度，其中「糧食安全」與「能源安全」為多年來備受關注之議題；反觀我國不論是糧食或能源皆需高度依賴國外進口，欠缺自主性，因而高成本地投資建置風力及太陽光電等各項再生能源，卻忽略了我國亦為林木資源極豐富的海島型國家，全島蒼鬱林木每年所剩餘之廢棄餘材，在國外早已發展成高效率效能的木質燃料，以替補昂貴、易汙染且終將竭盡的化石能源。
本年度研究結合「糧食安全」與「能源安全」之戰略概念，藉以評估我國在戰備時期能源遭限制性進口，導致能源供給短缺，為維持烹煮糧食需求的情況下，使用木質能源替補供氣燃料之量能。經情境模擬敏感度分析結果顯示，利用全國廢棄樹枝年產量轉製木質顆粒，在回收利用率100%情況下，替補於液化天然氣糧食燃料失衡時，使用天數約為41-68天；替補於液化石油氣糧食燃料失衡時，使用天數約5-8天。 對此，說明木質能源雖未能完全替代進口供氣燃料，卻可即時因應緊急所需，再加上若能有效規劃已達收穫期之人工造林定期定量轉能機制，勢必更具其價值。未來應研擬相關木質能源發展策略，以提供多元化再生低碳燃料之運用，並期研究結果可提供能源政策主管機關在制訂生質能源發展政策時參考之用。
Climate change has threatened the global ecological environment. Many researchers have proposed various indicators to examine the level of security in their countries.Among the indicators, both food security and energy security have been highly concerned for many years.Food and energy in Taiwan are heavily reliant on foreign imports that lack of autonomy.Thus, Taiwan stimulates high investment cost in developing renewable energy such as wind power, solar energy and others, but overlooks the abundant forest resources.The wood residues from luxuriant forests each year have long been developed highly efficient and effective wood fuels in foreign countries in order to replace the expensive, high pollution and ultimately depleted fossil fuels. This research combined the strategic concepts of food security and energy security this year to assess utilization of wood energy that substitutes capacity of gas fuels
during the war preparation ,in order to maintain the demand for cooking food that energy would face in restricting import ,which led to an energy supply shortage in Taiwan.The results of sensitivity analysis that simulated situations showed that utilization of national waste twigs annual yield generated wood pellets, under the condition of recovery and utilization rate was 100%, the service days was around 41-68 days that wood pellets substituted liquefied natural gas as food fuels unbalanced, and the service days was around 5-8 days when wood pellets substituted liquefied petroleum gas as food fuels unbalanced. Wood energy could not completely replace imported gas fuels, but it could immediately to cope with emergency real time.In addition, if artificial afforestation that has reached harvesting season can be planned effectively by an energy transformation mechanism quantitatively and regularly, wood energy would be more valuable.Development strategy of woody energy should be surveyed and drawn up in the future that providing not only utilization of diversified low carbon fuels, but also findings as a reference for developing bioenergy policies to competent authority of energy strategy.