Marine diesel engine is a kind of diesel engine specially used for ship propulsion and power generation. It uses diesel as fuel and converts diesel into power during the working process of the internal combustion engine, thereby driving the ship forward or generating electricity.

Marine diesel engine has the following characteristics:

1. Performance: Marine diesel engine has good fuel combustion efficiency and low fuel consumption. They can provide greater power output with less fuel consumption, thereby improving the economy and sustainability of the ship.

2. Powerful power output: Marine diesel engines usually have high power and torque output, which can provide enough power to drive large ships. They can be adapted to the needs of different ship types and sizes, including freighters, passenger ships, tankers, fishing boats, etc.

3. Reliability and durability: Marine diesel engines are designed to be robust and capable of operating in harsh marine environments. They have a long service life and low maintenance frequency, and can maintain stable performance under long-term navigation and heavy load conditions.

Low emissions and environmental protection: Marine diesel engines have low emission levels and meet the environmental protection requirements and emission standards of the International Maritime Organization. Modern marine diesel engines use advanced emission control technologies, including exhaust gas recirculation, particulate matter traps, etc., to reduce environmental pollution.

5. Versatility: Marine diesel engines can not only be used to push ships forward, but also as generator sets. Ships usually need to generate electricity to supply power to a variety of equipment and systems, such as lighting, communications, navigation, air conditioning, marine diesel engines can provide reliable power support.

In short, marine diesel engines are reliable and environmentally friendly diesel engines specifically used for ship propulsion and power generation. They play an important role in the field of navigation, providing power support for the ship and ensuring the smooth operation of the ship.