A dual-shaft dual-motor marine ammonia-electric hybrid power system

Abstract

The purpose of the present invention is to provide an ammonia-electric hybrid power system for a ship with two shafts and two motors, which includes an ammonia fuel engine, a first reversible motor, a second reversible motor, a third reversible motor, a diesel generator set, a storage battery, a capacitor, a propeller, Liquid ammonia storage and supply devices, power transformation devices, ship power grids, ship loads, and ship cooling systems. The invention can realize the mixed propulsion of the ammonia fuel engine and the dual motors to propel the double variable pitch propellers. The redundant arrangement of the propellers can be driven jointly or separately. Constant speed propeller variable pitch. The coordinated power supply of the diesel generator set and the energy storage unit realizes the multi-stage utilization of the energy storage unit and the engine cold energy at the same time, which reduces the energy consumption of the ship, improves the efficiency of the whole ship, and improves the scope of application of the system.

Description

technical field [0001] The invention relates to a ship power system, in particular to a ship hybrid power system. Background technique [0002] With the emission regulations formulated by the International Maritime Organization and the energy efficiency design index becoming more stringent, it is imminent to solve the problems of high energy consumption and high pollution of ships. Under the background of advocating green, efficient and sustainable development, the country is actively promoting the greening of ships in the field of ships. Construction and the realization of energy diversification have put forward new requirements for the development of ships. [0003] Electric propulsion, as the development trend of ship power in the future, has the advantages of high efficiency, cleanliness and reliability. However, the limitation of battery capacity leads to high manufacturing cost, long charging time, short battery life, and low redundancy, which are still difficult to m...

AI Technical Summary

Problems solved by technology

However, the limitation of battery capacity leads to high manufacturing cost, long charging time, short battery life, and low redundancy. It is still difficult to meet the actual needs at present.

Moreover, due to the influence of power generation methods, power density and energy storage technology, pure electric ships at this stage cannot achieve high-performance speed, acceleration and self-control, and their battery life is also restricted by their battery capacity. Provide continuous energy output, but the traditional power grid diesel generator sets have low power generation efficiency at a constant speed, and they are in low-load conditions for a long time, resulting in serious waste of fuel

[0004] The reduction of petroleum resources makes it difficult to meet the needs of traditional diesel engine propulsion. On the other hand, diesel engine propulsion has the disadvantages of high emissions and high pollution. Although measures such as installing after-treatment devices and optimizing fuel injection can improve emissions, it will be difficult to meet more stringent requirements in the future. Although the pure natural gas engine or dual-fuel engine propulsion can greatly reduce the emission of sulfur and nitrogen compounds, it is still difficult to solve the problem of CO 2 Emission problems, and the natural gas engine has disadvantages such as poor low-working condition characteristics, insufficient torque loading, etc., and there are obvious deficiencies in power performance

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