A marine ammonia-electric hybrid power system with dual hosts and dual motors with battery thermal management

Abstract

The purpose of the present invention is to provide a marine ammonia-electric hybrid power system with dual main engines and dual motors with battery thermal management, including ammonia fuel engine, diesel engine, reversible motor, diesel generator set, battery, capacitor, propeller, liquid ammonia storage and supply devices, substation devices, ship power grids and ship cooling systems. The diesel generator set, battery and capacitor are connected to the ship power grid through the frequency conversion device; the ship power grid is connected to the ship's daily load and each reversible motor through the power conversion device; the first reversible motor is connected to the ammonia fuel engine through the belt crankshaft; the first and second The reversible motors are respectively connected to the diesel engine and the ammonia fuel engine through a clutch, and then drive the variable-pitch propeller through a gearbox; the third and fourth reversible motors directly drive the fixed-pitch propeller. The invention can realize the hybrid propulsion of the ammonia fuel engine, the diesel engine and the motor, and the multi-stage utilization of the energy storage unit and the cold energy of the engine.

Description

technical field [0001] The invention relates to the field of ship power systems, in particular to ship hybrid power systems. 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 dif...

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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