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Marine Propulsion Engine, also known as Marine main propulsion engine (referred to as marine main engine), as the main power source of a ship, refers to the engine that directly drives the propeller to provide navigation propulsion power for the ship.
Marine propulsion engines include two categories: Marine internal combustion engines (referred to as Marine engines) and Marine turbines. Among them, the marine internal combustion engines are the most widely used and have high thermal efficiency, occupying an absolute numerical advantage in modern transport ships. The application scope ranges from yachts to commercial transportation and ocean going vessels. The marine propulsion engines operated by our company mainly refer to marine internal combustion engines.
Classification of Marine internal combustion engines:
1. Marine engines can be divided into three categories based on the different fuels used:
■ Marine liquid fuel engines, including Marine fuel oil engines, Marine crude oil engines, Marine liquid biofuel engines, Marine methanol engines, etc.
■ Marine gas engines, mainly refer to liquefied natural gas engines used in ships.
■ Marine dual fuel engines, the dual fuel engine solution allows traditional engines to run on both environmentally friendly main fuel and fuel oil modes. The power output range is from 330 kW to 23000 kW.
2. Marine engines can be divided into two categories based on the number of working cycle strokes:
■ Two-stroke engine, it completes one working cycle by rotating the crankshaft once, with a power output about 80% higher than a four stroke engine at the same cylinder diameter and speed. It is commonly used as the main propulsion power for large ocean going ships.
■ Four stroke engine, with the crankshaft rotating two times to complete one working cycle, accounts for 75% of the total number of marine diesel engines and is commonly used in container ships, bulk carriers, and marine auxiliary engines.
3. Marine engines can be divided into three categories based on their speeds:
■ Low speed propulsion engine, engine speed n ≤ 300 r/min. It is a large cylinder bore, two-stroke engine. The single unit capacity reaches 30 - 80 MW. It is mostly used for large ocean going cargo ships and container ships, and can directly drive propellers without the need for gearboxes. It has a long service life, high propulsion efficiency, and good fuel economy.
■ Medium speed propulsion engine, with engine speed between 300 < n ≤ 1000 r/min. It is a medium-sized cylinder bore, four stroke engine. Single machine capacity of over 20 MW. It is commonly used for passenger ships, medium-sized warships, and inland waterway vessels, and can be adjusted through gearboxes to balance volume, weight, and power output.
■ High speed propulsion engine, the engine speed n > 1000 r/min. It is a small bore, four stroke engine. The single machine capacity is usually below 3 MW. Mostly used for military vessels, speedboats, and submarines, suitable for scenarios with high spatial mobility requirements. It has a small volume and high power density.
Marine Marine Fuel Oil Engines engine's typical applications could include but are not limited to vessels such as harbor tugs, patrol boats, government boats, supply boats, dredgers, barges, shipping vessels, pleasure boats, passenger boats and fishing boats.
了解更多 +Marine gas engines mainly used main propulsion power or electric propulsion systems, and can also be used for driving generator sets. ranges from 300 kW to 7,290 kW.
了解更多 +Marine Dual Fuel Engine solutions allows conventional diesel engines to operate on a mixture of environmentally friendly Main fuel and Fuel oil. We supply the Marine Dual Fuel Propulsion Engines with output rating from 300 kW to 23,000 kW.
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