Double-host and double-motor ship ammonia-electricity hybrid power system with battery thermal management function

Abstract

The invention aims to provide a double-host and double-motor ship ammonia-electricity hybrid power system with a battery thermal management function. The system comprises an ammonia fuel engine, a diesel engine, reversible motors, diesel generator sets, a storage battery, a capacitor, propellers, a liquid ammonia storage and supply device, power transformation devices, a ship power grid and a whole ship cooling system; the diesel generator sets, the storage battery and the capacitor are connected with the ship power grid through frequency conversion devices; the ship power grid is connected with ship daily load and each reversible motor through the power transformation devices; the first reversible motor is connected with the ammonia fuel engine through a belt crankshaft; the first reversible motor and the second reversible motor are respectively connected with the diesel engine and the ammonia fuel engine through clutches and then drive the variable-pitch propeller through a gear box;and the third reversible motor and the fourth reversible motor directly drive the fixed-pitch propellers. Hybrid propulsion of the ammonia fuel engine, the diesel engine and the motors and multi-stage utilization of cold energy of an energy storage unit and the engines can be achieved.

Description

Technical field [0001] The invention relates to the field of marine power systems, in particular to marine hybrid power systems. Background technique [0002] With the stricter emission regulations and energy efficiency design index formulated by the International Maritime Organization, it is urgent to solve the problem of high energy consumption and high pollution of ships. Under the background of advocating green, efficient and sustainable development, the country actively promotes the ship industry to accelerate the green ship Construction, to realize the diversified development of energy, puts forward new requirements for the development of ships. [0003] Electric propulsion, as the future development trend of ship power, has the advantages of high efficiency, cleanliness and reliability. However, the limitation of battery capacity has led to high manufacturing costs, long charging time, short endurance, and low redundancy. It is still difficult to meet actual needs. Moreove...

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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