Energy-saving ship-handing method for all-gyration tugboat assisting large ship in berthing and departing

Abstract

The invention discloses an energy-saving ship-handling method based on an all-gyration tugboat, which is an improvement on the prior ship-handling method. The energy-saving ship-handling method is characterized by comprising the steps of detecting a revolution meter of a host machine of the energy-saving ship-handling method according to the condition of the tugboat, adjusting the rotational frequency of the tugboat at dead slow speed, low speed, middle speed and high speed according to the revolution meter and keeping the output power of the host machine to basically stable at different speeds so as to realize that single-host-machine operation mode replaces double-host-machine operation mode to complete steps of navigation, towing navigation and pushing or towing operation for port working. The practice shows that the ship-handling method has remarkable effect on energy saving and can be popularized and applied to various all-gyration tugboats in any navigation area.

Description

technical field [0001] The invention belongs to a fuel-saving (energy-saving) method for a full-turn tugboat engaged in port operations (port operations), navigation, and towing navigation. Background technique [0002] Azimuth tugboat is an independent type of ship. It was gradually introduced into China in the 1970s and is mainly used for port operations and long-distance towing operations. At present, it has become the absolute main force for ships in major domestic ports. [0003] The steering system and main mechanical parts of the full-turn tugboat are currently produced by Japan and Germany. Its power plant is composed of two marine diesel engines, each main engine drives a propeller, and the propeller and the rudder function are designed as a whole, which can rotate 360 ​​degrees, so when operating this kind of ship, it can be in situ 360-degree rotation, so it is called full-turn tugboat. [0004] When tugboats are engaged in port operations, they often need to ...

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Problems solved by technology

[0005] Due to its unique design and generally high power, the full-turn tugboat is very flexible to maneuver, but this design is also accompanied by a defect, that is, it causes a part of inactive power to be generated - fuel consumption

[0006] Practice has shown that in daily navigation and operation, a phenomenon will occur in full-turn tugboats: when the tugboat is running with dual main engines with the same number of revolutions, the speed of the ship will be the same as turning off one of the main engines and keeping the other main engine at the same speed. The speeds during the operation are almost the same, no matter in the low speed, slow speed, medium speed or fast state, if the above methods are used to operate, the speed will differ by at most about 2 nautical miles, but the fuel consumption will vary greatly.

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