Abstract
In recent years and with the increasing rigor of the International Maritime Organization (IMO) emission regulations, the shipping industry has focused more on environment-friendly and efficient power. Low-pressure dual-fuel (LP-DF) engine technology with high efficiency and good emissions has become a promising solution in the development of marine engines. This engine often uses pre-combustion chamber (PCC) to ignite natural gas due to its higher ignition energy. In this paper, a parametric study of the LP-DF engine was proceeded to investigate the design scheme of the PCC. The effect of PCC parameters on engine performance and emissions were studied from two aspects: PCC nozzle diameter and PCC nozzle angle. The results showed that the PCC nozzle diameter affected the propagation of the flame in the combustion chamber. Moreover, suitable PCC nozzle diameters helped to improve flame propagation stability and engine performance and reduce emissions. Furthermore, the angle of the PCC nozzle had a great influence on flame propagation direction, which affected the flame propagation speed and thus the occurrence of knocking. Finally, optimizing the angle of the PCC nozzle was beneficial to the organization of the in-cylinder combustion.
Highlights
Since January 1, 2016, the Tier III emission standard have been implemented by the InternationalMaritime Organization (IMO) [1,2]
With the fuel Sulphur global limit of 0.5% entering into force on January 1, 2020, the liquefied natural gas (LNG) has gradually become a promising alternative fuel for vessels sailing inside and outside the Emission Control Areas (ECAs) [3,4]
The marine 2-stroke Low-pressure dual-fuel (LP-DF) engine can change its working mode freely, as it can switch from diesel mode using heavy fuel oil (HFO) or Light Fuel Oil (LFO) as fuel to dual-fuel mode using natural gas as fuel
Summary
Since January 1, 2016, the Tier III emission standard have been implemented by the InternationalMaritime Organization (IMO) [1,2]. With the fuel Sulphur global limit of 0.5% entering into force on January 1, 2020, the liquefied natural gas (LNG) has gradually become a promising alternative fuel for vessels sailing inside and outside the Emission Control Areas (ECAs) [3,4]. When natural gas is used as the only fuel of the engine, the power of the gas engine will decrease compared to the same size diesel engine [8]. Using diesel-ignited natural gas is considered as an effective way to solve the power reduction problem [9]. Under such measures, the problem of power reduction when using natural gas can be better solved, and the latest emission regulations can be fulfilled [10]
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