Happened twice in the 1970 s energy crisis, soaring oil prices, shipping companies operating costs. Especially in recent years, rising oil prices rapidly, resulting in a marked change vessel operating cost factors, the proportion of fuel increases sharply, is now more than 50%. Ship energy saving, reduce fuel consumption and fuel costs, improve plant economy has become an important subject, makes the energy conservation work of much attention. So from diesel engine manufacturers to shipyards and shipping companies, have been reducing fuel costs, to improve its economic benefit.
Ship energy saving one rely on technological progress, and two by strengthening the basic management. Technological progress is the use of energy saving technology to promote the ship to carry out the energy conservation work, for example, when a new build ship design for ships, machine, blade optimization design on energy saving and rational allocation of propulsion diesel engine and power plant, try to reduce the ship resistance and improve the propulsive efficiency; Propulsion diesel engine using long stroke, less number of cylinders and miniaturization of the diesel engine, and optimize the pressurization system improvement, improve the scavenging pressure, optimizing the combustion chamber and using the new combustion system, improve the fuel injection system, improve the maximum combustion pressure, etc., in order to reduce the fuel consumption of diesel engine directly. Propulsion diesel engine power plant aspects including host shaft generator, using tandem propellers, waste heat recycling and energy saving technology to improve the overall thermal efficiency of the ship. Strengthening the basic management includes: ship reasonable scheduling; Economic channel and using meteorological navigation; Take slow steaming and energy-saving speed; Using poor quality fuel oil; To strengthen the management efficiency, reasonable maintenance of equipment, keep the diesel engine and its power equipment in good working condition and so on.