Dual Fuel Engine｜VISION01｜Technology｜About YANMAR

船用引擎與柴油和天然氣燃料結合使用，具有更潔淨的排放和更多能源。

大型能源產品管理部，能源解決方案業務: From the perspective of global environmental protection, emission regulations have been stricter in the marine world, and reduction of environmental pollutants such as NO_X and SO_X has become a challenge. To reduce environmental impacts, Yanmar has developed a dual fuel engine that can switch between diesel and natural gas fuel (LNG). The installation of Dual Fuel Engines on tugboats and other are increasing.

考慮全球環境並以高經濟效益運轉的引擎

Large vessels operating in the seas around the world are equipped with engines with high power. An issue confronting our world today is the air pollutants from the emission of those large engines. In recent years, the use of natural gas has attracted attention. Liquefied natural gas (LNG) is environmentally friendly and can reduce greenhouse gases. Therefore, Yanmar has begun developing the dual-fuel engine that can flexibly use both LNG and diesel fuel to take advantage of eco-friendliness and wider availability. We set the goal high to develop a new engine complying with The International Marine Organization (IMO) Tier 3 NO_X (IMO3) and SO_X regulations for all sea areas based on a reliable model that can pursue improvements in the life cycle value (LCV) for customers.

Effective since January 1, 2016, the 3rd tier regulation (IMO3) is that IMO requires on the standard of NO_X emission control. IMO3 to regulate 80% lower emissions than the primary regulation, is applied within a designated sea area called NO_X Emission Control Area (N-ECA). The US and Canadian coasts, the U.S. Caribbean, the North Sea and the Baltic Sea have already been regulated for SO_X, while the U.S. and Canadian coasts have already been regulated for NO_X. The North Sea and the Baltic Sea will be subject to regulation from January 1, 2021.

利用洋馬的科技實現安全穩定的航行

洋馬開發的雙燃料引擎採用了精準的氣流控制技術。時刻保持最佳燃燒狀況，這使得在同時使用天然氣和柴油時，運作更加可靠和穩定。此外，採用了獨特的控制系統以確保在海上作業時的安全性。通過對設備進行多路復用，我們實現了安全性和冗餘性，使得每個軸僅需一台機器即可實現安全航行。此外，它還配備了自己的空燃比控制和爆震偵測系統。即使在使用甲烷含量低的天然氣燃料時，也會有異常燃燒（爆震）的憂慮，氣缸壓力會被實時分析。通過高速控制，可以避免爆震。雙燃料引擎可與世界各地的天然氣兼容，並且可以不受能源限制地運行。在航行過程中，即使在最大輸出時，也可以從柴油模式切換到天然氣模式。在緊急情況下，它可以安全即時地從天然氣模式切換到柴油模式。

符合嚴格的環境法規

In the gas mode of the developed model, 6EY26DF, we achieved approximately 80% of NO_X (nitrogen oxide) , 25% of CO₂, 99% of SO_X (sulfur oxide) and PM (particulate matter) reduction compared to our previous model in the same engine class, 6EY26W. Meeting the 3rd tier IMO standard while maintaining its advantages such as high fuel efficiency and power, we created new technologies that address the global issues of reducing environmental impacts and fluctuating fuel prices. Yanmar has been driving the evolution of engines, and will continue to diversify technologies for the next generation.

安裝在Ishin拖船上
凝聚人心成為項目的動力

自2019年3月以來，名為Ishin的拖船一直為在大阪灣和瀨戶內海航行的大型貨船進行安全工作，並從港口拖船進出。作為日本第一艘以液化天然氣為燃料，並符合IGF Code（*）標準的拖船，它受到了人們的關注。洋馬的雙燃料引擎6EY26DF是Ishin的主推進引擎。

拖船及其工作性質使它會突然加重引擎負擔，因為它可能會拖拉比它更重的船舶或貨物。負責測試的洞井回顧道：「洋馬沒有生產船用天然氣引擎的歷史，而且天然氣模式通常易受負載波動的影響。作為首件相關產品，我覺得這個項目真的很困難。」「在與合作夥伴的會議上，我們被問到是否可以繼續進行，又被告知他們不會使用不符合標準的拖船。即使面對難聽的說話，我們仍共同努力以達到期望，並不斷解決問題，」洞井先生和系統設計經理久保先生說。負責引擎設計的西村說，「我們徹底評估了各安全性，以便機組人員也可以安全使用天然氣模式，對環境亦同時是安全的。」

首航時，服務部門和開發部門的成員登上了拖船。每個合作夥伴都稱讚，團結的感覺隨著船的形成而建立起來。那是純粹的喜悅和令人印象深刻的工作。該項目是通過客戶和洋馬的共同推廣而實現的。

* IGF Code：2017年發布的使用氣體或其他低閃點燃料的船舶的國際安全規範指定安全要求。