Double-shaft double-motor ship ammonia-electricity hybrid power system with fuel cell

Abstract

The invention aims to provide a double-shaft double-motor ship ammonia-electricity hybrid power system with a fuel cell. The system comprises an ammonia fuel engine, a first reversible motor, a secondreversible motor, a third reversible motor, a diesel generator set, a storage battery, a super capacitor, a fuel cell, a propeller, a liquid ammonia storage and supply device, a power transformationdevice, a ship power grid, a ship load, a whole ship cooling system and an exhaust gas recirculation system. Hybrid propulsion of the ammonia fuel engine and the motor and coordinated power supply ofthe diesel generator set and the energy storage unit can be achieved. Meanwhile, multi-stage utilization of cold energy of the energy storage unit and the engine is achieved, waste gas of the fuel cell supplements gas for the waste gas turbine, the gas inlet efficiency is improved, ship energy consumption is reduced, the whole ship efficiency is improved, and the application range of the system iswidened.

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...

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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 Emissions problems, and natural gas engines have disadvantages such as poor low-working conditions, insufficient torque loading, etc., and there are obvious deficiencies in power performance. Ammonia-fueled engines can achieve carbon-free but increase the emission of nitrogen oxides

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