Advantages and disadvantages of marine low-speed diesel engine

1, unique frame-type main bearing structure, high body stiffness, small vibration amplitude and low noise decibel.

2. One cylinder and one cover are convenient for vehicle maintenance and reduce maintenance cost. The main parts are always purchased from all over the world to achieve high engine configuration.

3. The diesel engine accessories are completely installed, and the air cooler and seawater and fresh water heat exchanger are installed on the diesel engine, which is convenient for engine room layout.

4. The diesel engine cooling system adopts internal and external dual-cycle water cooling mode, in which the internal cycle uses fresh water to cool the diesel engine, and in the external cycle, seawater is used to cool the fresh water through the seawater fresh water heat exchanger, thus improving the service life of the diesel engine.

Disadvantages:

1. Some prototype machines have been successfully manufactured in China, with great technical difficulties and high quality requirements. Moreover, it is bulky and heavy, and there is no machine with a pump, which requires too many external equipment.

2. Due to the change of international and domestic market demand and fierce product competition, China's low-speed diesel engine has been completely replaced by Man -B&; W's MC/MC-C and Wassilyan-Sulzer's RTA series are replaced, and most of them are propulsion power packages for export ships.

Extended data:

Low speed diesel engine

Direct-drive propeller requires lower rotational speed to make the propeller have higher propulsion efficiency. Medium-and high-speed diesel engines drive propellers through gear reducers, and the gearbox is generally equipped with reversing gear to realize propeller commutation, but low-speed diesel engines and some medium-speed diesel engines can commutate themselves.

Medium-speed and high-speed diesel engines are also electrically driven by generator-motor-propeller. When high power is needed, multiple machines can also be operated in parallel, and only one main machine is needed to work when sailing at low speed, thus improving the operation economy and reliability. When two main engines are installed on the same ship, they are divided into left and right engines according to the installation position and propeller direction.

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