FEATURES OF CALCULATING THE PARAMETERS OF AUXILIARY-EMERGENCY TRAFFIC ON SEA-GOING SHIPS WITH COMBINED DIESEL-ELECTRIC PROPULSOR

The traditional method for calculating the parameters of the electric movement of sea vessels in auxiliary-emergency modes at low vessel speeds, which is supplemented by design ratios that allow the correct calculation taking into account the power of the ship’s power plant and fuel consumption, is considered in the paper. Other, simplified methods do not require a lot of information and auxiliary diagrams to determine the power of the drive motor, depending on the resistance to the vessel movement. As an example, a container ship with a capacity of 16,000 containers with the 12 RTflex-96C main engine from WÄRTSILÄ-SULZER with a power of 61776 kW, the synchronous shaft generator/motor from SIEMENS with a electrical power of up to 6.6 MW is considered. The calculation is performed in accordance with the considered methods and the possibility of providing auxiliary-emergency electric propulsion of the vessel for the considered schemes is substantiated. Thus, when modernizing a propulsion system or designing new ships, it is advisable to compare the results of methods for calculating the power of diesel generators on the verge of the minimum stable speed of the main engine and choose a higher value. Comparison of specific and absolute fuel consumptions, carried out on the basis of well-known approximation polynomials for low- and high-speed diesel engines during auxiliary-emergency driving, has shown that fuel consumption when driving in the considered mode to ensure the minimum stable speed of the main engine is less, which also allows you to save the main engine service life. This ratio is observed on most sea transport vessels. Considering also that diesel generators operate at almost optimal load, and the main engine is idling, electric propulsion provides a significant reduction in harmful emissions into the atmosphere. The paper will be useful for specialists involved in the technical operation of the fleet.

main engine, ship propulsion, diesel generator, shaft motor/generator, auxiliary-emergency ship movement, fuel consumption, Froude number, Papmel diagram

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