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* Ship engine: redefine the power of the sea since humans began to use ships for ocean trade and importers and exportersexploration, the power of ships has been a key issue.From the original sails, paddlers and man-shaking, to steam engines, diesel engines and nuclear power, the development of ship power has gone through a long and transformative history. In this long history, ship engines are undoubtedly an important milestone in ship power. Here, this article will discuss the great contribution of ship engines to the human navigation industry as a revolutionary sea navigation force. The ship engine was invented by British scientist James Watt in 1776. The original engine used steam as a power source, but in actual use, ships often could not carry too much fuel, so they used easy-to-carry fuels such as gas and white alcohol. Later, Watt's principle was improved, and American navigator John Friedley applied the steam engine to the ship for the first time, giving it a larger range and carrying capacity.In the end, the research results of ship engines evolved into a variety of steam engines, internal combustion engines and electric engines, laying the foundation for human ocean navigation. Compared with the power development of ships in the past hundred years and the current use of modern navigation technology, as an important component of the core of navigation, the realization of the ship engine needs to solve three key problems: 1. Efficiency: that is, the balance between the speed of the ship and the fuel consumed, to give full play to sufficient power, and at the same time be more thrifty, It can meet its operation and maintenance costs during its life cycle. 2. Sustainability: In order to meet the requirements of global warming, environmental protection and energy saving, ships must minimize their impact on the marine environment. 3. Reliability: The reliability of the engine is the guarantee for the smooth operation of the ship. Once the engine fails, the occupants and property will be in great danger.In response to the above three key issues, modern ship engines show incomparable advantages over the previous generation of ship engines. Among them, it is especially worth mentioning that in recent years, environmental protection and energy saving have become a universal demand, and the engines used in ships also need to be rapidly transformed. The International Maritime Organization (IMO), which came into force on January 1, 2021, issued an order to restrict the import of fuel and sulfur-free fuel in global ports, aiming to reduce the harm of ship emissions to air and health. In response, engine manufacturers around the world have also responded and launched a series of marine engines that can control NOx, SOx and PARTICLES substances. Compared with traditional diesel engines, the new generation of ship engines adopts new fuel injection and injection technology, which can achieve clean emissions in the atmosphere.The giant cargo ship Oriana, which participates in the international environmental organization, is the world's first giant cargo ship to adopt a new technology ship engine. It is believed that as more ships adopt environmentally friendly ship engines, human navigation activities will be more efficient, sustainable and reliable. In a word, the ship engine is an important part of modern navigation technology, and its invention and evolution have made great contributions to the human navigation industry. In the future, with the progress of science and technology and the continuous improvement of environmental awareness, ship engines will continue to be improved and perfected, redefining the future of human navigation power with efficient, sustainable and reliable characteristics.

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