Abstract
This paper presents research on the combustion and emission characteristics of a four-stroke Natural gas–Diesel dual-fuel marine engine at full load. The AVL FIRE R2018a (AVL List GmbH, Graz, Austria) simulation software was used to conduct three-dimensional simulations of the combustion process and emission formations inside the engine cylinder in both diesel and dual-fuel mode to analyze the in-cylinder pressure, temperature, and emission characteristics. The simulation results were then compared and showed a good agreement with the measured values reported in the engine’s shop test technical data. The simulation results showed reductions in the in-cylinder pressure and temperature peaks by 1.7% and 6.75%, while NO, soot, CO, and CO2 emissions were reduced up to 96%, 96%, 86%, and 15.9%, respectively, in the dual-fuel mode in comparison with the diesel mode. The results also show better and more uniform combustion at the late stage of the combustions inside the cylinder when operating the engine in the dual-fuel mode. Analyzing the emission characteristics and the engine performance when the injection timing varies shows that, operating the engine in the dual-fuel mode with an injection timing of 12 crank angle degrees before the top dead center is the best solution to reduce emissions while keeping the optimal engine power.
Highlights
This study focuses on the combustion process and emission characteristics inside the engine cylinder of a four-stroke Natural gas (NG) port injection and diesel pilot direct injection dual-fuel engine that uses NG as primary fuel and diesel oil as pilot fuel
In order to investigate the effects of the start of injection (S.O.I) timings on the combustion and emission formations of the engine, some simulations of the combustion when changing the S.O.I timing were conducted
This reduction tendency gives us a remarkable solution to further reduce NO emissions by retarding the S.O.I angle, considering the engine power, we find that the engine powers were changed as the S.O.I angle changed, the engine reached the optimal power at the S.O.I angle of 348 crank angle degree (CAD), the designed S.O.I angle of this simulated engine
Summary
Van Chien Pham 1 , Jae-Hyuk Choi 2 , Beom-Seok Rho 3 , Jun-Soo Kim 3 , Kyunam Park 4 , Sang-Kyun Park 5 , Van Vang Le 6 and Won-Ju Lee 7,8, *. Division of Marine Engineering, Korea Maritime and Ocean University, 727, Taejong-ro, Yeongdo-gu, Busan 49112, Korea. Interdisciplinary Major of Maritime AI Convergence, Korea Maritime and Ocean University, 727, Taejong-ro, Yeongdo-gu, Busan 49112, Korea. Gas-Diesel Dual-Fuel Marine Engine at Full Load.
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