Comparison and Simulation of Fuel System Design for Ammonia and Methanol
According to the regulations of the International Maritime Organization(IMO)for COx,SOx,and NOx emissions from ship engines,a comparative analysis is conducted on the design of clean and low-carbon fuel systems based on the fuel input requirements of MAN engines.The critical problems and solutions are compared for several fuels such as ammonia,methanol and liquefied petroleum gas(LPG),and computational fluid dynamics(CFD)method is used to simulate the return liquid mode of the fuel system.The simulation results show that the adjustable pressure reducing elements designed on the LPG return pipeline can realize fuel reuse in the pressure range of 1.8-2.3 MPa,effectively forming a closed loop.When the loss coefficient K is 500-6 500,the fuel pressure supplied to the LPG host meets 5.1-5.5 MPa requirement.Comparative analysis shows that adjusting the supply pump parameters and return liquid loss coefficient K in the LPG fuel supply system can enable the system to be applied to the design of ammonia fuel supply system.
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