現今海運已成為國際間運輸的主流，全球貿易有90%都透過海上運輸，然而大部分的商用船舶多使用重油為燃料，造成大量環境汙染。船舶運輸產生的SOX、NOX及CO2e排放量分別佔全球的12%、13%、2.8%，對於環境的影響衝擊甚大。液化天然氣(LNG)因具有環保、安全性高且符合國際排放量標準，在國際上已成為船舶替代燃料的最佳選擇。
因此，本研究探討台灣區域兩岸及近海五艘營運中的客貨滾裝船(下稱客滾船)，以EPA及洛杉磯港模型導出船舶以LNG替代傳統燃料對環境影響之差異，並以SOX及NOX每延噸海浬排放量進行載運率與排放量之情境分析。實證分析結果為，不論以EPA模型推估或是以洛杉磯港模型推估，以LNG替代傳統燃料，SOX排放量將降低90%以上、NOX排放量將降低70%以上、CO2排放量將降低13%以上，顯示出LNG對於降低環境汙染確有明顯效益。在情境分析中，研究結果得出，以航線類型區分，應以兩岸航線優先推動LNG較具效益；若以船舶類型區分，應以傳統船優先推動LNG較具效益。
關鍵詞: 重油、硫氧化物、LNG、客貨滾裝船、兩岸航線

In Today world, maritime transportation is increasing becoming an international mainstream business. Currently over 90% of global trade depends on maritime transport, but most of the merchant vessels use Heavy Fuel Oils (HFOs) for shipping propulsion, Subsequently causing a lot of environmental pollution. The contribution of ships to global emissions can be identify as follows in the following components: sulfur oxides(SOX), 12%；nitrogen oxides(NOX), 13%；carbon dioxide equivalent(CO2e), 2.8%. Liquefied natural gas (LNG), due to its environmental friendliness, safety and its fulfillment of the international emissions standards, has become the best choice for ships alternative fuel. The aim of this research is to analyze the five offshore ships that are currently operating in Taiwan and also to explore the environmental influences of using LNG alternative to traditional fuels by EPA and PLOA models, and further conduct a scenario analysis of SOX and NOX emissions of per ton-miles. The results show that LNG leads to a reduction of 90% of SOX emissions and 70% of NOX emissions and 10% of CO2 emissions in at least both modes. In the scenario analysis, the results show that in order to distinguish the type of route, then cross-strait routes should be a priority to promote LNG fuel and in order to distinguish the type of ship, then traditional vessels should be a priority to promote the LNG fuel.
Key words: Heavy Fuel Oils (HFOs), sulfur oxides (SOX), Liquefied natural gas (LNG), offshore ships, the cross-strait routes

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