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Marine Diesel Engines, also known as Marine fuel oil engines, usually refer to the internal combustion engine that uses marine fuel oil as fuels. The most widely used, with high thermal efficiency, and an absolute numerical advantage in modern transport ships.
Marine diesel engines can be used from yachts to commercial transport and ocean going ships, and typical applications could include but are not limited to vessels such as cargo vessels, offshore engineering vessel, container ships, cruise ships, ferries, tugboats, dredgers, passenger ships, pleasure boats, fishing boats, patrol boats, fire boats. Combustible diesel fuel or heavy fuel oil. For detailed fuel oil information, please visit: Marine Fuel Oil.
Marine auxiliary engines are mainly used as generator set engines; however, they can be used for electrically driven pumps, winches, conveyors, thrusters, etc. Engines can be radiator cooled or heat exchanger/keel cooled.
Classification of Marine diesel engines:
1. Marine diesel engines can be divided into two categories according to their purposes:
1) Marine main diesel engines, also known as Marine propulsion diesel engines, serve as the primary power source for ships, directly driving propellers to provide propulsion power for navigation. According to the different types of fuel oil, it can be divided into two categories:
■ Diesel propulsion engines, mainly referring to high-speed and medium-speed diesel engines.
■ HFO propulsion engines, including two types: medium-speed and low-speed HFO engines.
2) Marine auxiliary diesel engines, it do not directly participate in the propulsion of ship navigation, but are used to drive various supporting equipment on board and ensure the daily operation of the entire ship. Most of them are medium to high speed, four stroke engines. According to different functions, it can be divided into two categories:
■ Auxiliary engines for power generation, namely marine diesel generator sets, including marine main generator sets and marine emergency generator sets. To provide stable power for the entire ship, it is required to maintain a constant speed when the load changes.
■ Equipment driven auxiliary engines, it drives auxiliary equipment such as air compressors, fire pumps, water pumps, hydraulic oil pumps, etc., to support the operation of various auxiliary systems on ships.
2 Marine diesel engines can be divided into three categories based on their speeds:
■ High speed diesel engines, namely marine high-speed diesel engines. The engine speed n > 1000 r/min. They are small bore, four stroke engine. The single machine capacity is usually below 3 MW.
■ Medium speed diesel engines, including medium speed diesel engines and medium speed heavy fuel oil engines. The engine speed 300 < n ≤ 1000 r/min. It is a medium-sized cylinder bore, four stroke engine. Single machine capacity of over 20 MW.
■ Low speed diesel engines, mainly refer to low-speed heavy fuel oil engines. The engine speed n ≤ 300 r/min. They are large bore, two-stroke engines. The single unit capacity reaches 30 MW - 80 MW.
