Emissions of nitrogen oxides (NOx) from marine propulsion systems have gained public interest resulting in emission limits as defined by the International Maritime Organization (IMO) with IMO Tier III, especially for vessels operating in Emission Control Areas (ECA). The reduction of greenhouse gas emissions is also increasingly important for marine propulsion. Minimizing NOx while reducing climate impact calls for technologies such as the gas engine with aftertreatment systems, preferably with the ability to run on alternative fuels. A proven technology for reducing NOx in marine engines is the Selective Catalytic Reduction (SCR) aftertreatment system. It is also possible to avoid engine raw emissions by shifting the combustion process to lower temperature levels. Hydrogen is an alternative fuel with combustion properties enabling premixed operation at significantly higher air-fuel ratio than natural gas (NG) and thus, reducing raw NOx emissions. The study uses a systematic approach to compare emissions and efficiency of a lean-burn gas engine with a natural gas and a mild conversion hydrogen setup, utilizing two different strategies: combustion of NG with the assumption of an SCR catalyst and high raw NOx emissions and combustion of pure hydrogen using the NOx reduction potential of higher excess air. The scope of the study makes it possible to illustrate engine concepts for future applications in the displacement class of 4.8 L per cylinder. The highest efficiency of 45.3% was achieved with the natural gas engine and SCR. The concept with the lowest Global Warming Potential (GWP) was the hydrogen fueled engine under the prerequisite of using green hydrogen, accompanied by a reduction in efficiency of 0.6% compared to the efficiency optimum of NG with SCR. Assuming the use of gray hydrogen, the GWP was 48% and 52% higher than with NG and NG with SCR, respectively, at the efficiency-optimal operating points.
JoungT-HKangS-GLeeJ-KAhnJ. The IMO initial strategy for reducing Greenhouse Gas(GHG) emissions, and its follow-up actions towards 2050. J Int Marit Saf Environ Aff Shipp2020; 4(1): 1–7.
2.
DerwentRSimmondsPO’DohertySManningACollinsWStevensonD. Global environmental impacts of the hydrogen economy. Int J Nucl Hydrogen Prod Appl2006; 1(1): 57.
NoussanMRaimondiPPScitaRHafnerM. The role of green and blue hydrogen in the energy transition—a technological and geopolitical perspective. Sustainability2021; 13(1): 298.
5.
OsmanAIMehtaNElgarahyAM, et al. hydrogen production, storage, utilisation and environmental impacts: a review. Environ Chem Lett2022; 20(1): 153–188.
SapraHGodjevacMDe VosPVan SluijsWLindenYVisserK. Hydrogen-natural gas combustion in a marine lean-burn SI engine: A comparitive analysis of Seiliger and double Wiebe function-based zero–dimensional modelling. Energy Convers Manag2020; 207: 112494.
9.
TealdoCDeutschJA. Emissions reduction of a direct injection diesel marine engine by adding hydrogen to the inlet manifold. Volume 8A: Energy. New York, NY: American Society of Mechanical Engineers, 2022. p.11012021.
10.
KorbBKawauchiSWachtmeisterG. Influence of hydrogen addition on the operating range, emissions and efficiency in lean burn natural gas engines at high specific loads. Fuel2016; 164: 410–418.
11.
SapraHDLindenYvan SluijsWGodjevacMVisserK. Experimental investigations of hydrogen-natural gas engines for maritime applications. Volume 1: large bore engines; fuels; advanced combustion. New York, NY: American Society of Mechanical Engineers, 2018. pp.11042018.
12.
ZeldovichYB. Oxidation of nitrogen in combustion and explosions. Acta Physicochim USSR1945; 21: 404–410.
13.
LavoieGAHeywoodJBKeckJC. Experimental and theoretical study of nitric oxide formation in internal combustion engines. Combust Sci Technol1970; 1(4): 313–326.
14.
HansonRKSalimianS. Survey of Rate Constants in the N/H/O System. In: GardinerWC (ed.) Combustion chemistry. New York, NY: Springer US, 1984, pp.361–421.
15.
BowmanCT. Kinetics of pollutant formation and destruction in combustion. Prog Energy Combust Sci1975; 1: 33–45.
16.
DodgeLGKubeshJTNaegeliDWCampbellPF. Modeling NOx emissions from lean-burn natural gas engines. Warrendale, PA: SAE International, 1998.
17.
NovaITronconiE. urea-SCR technology for deNOx after treatment of diesel exhausts. New York, NY: Springer Science+Business Media, 2014.
18.
ToshevP. NOx-Reduzierung in motorischem Abgas durch Ammoniakerzeugung im Teilstromverfahren aus Guanidinium Formiat und Harnstoff. Dissertation, Technischen Universitat Munchen, Munchen, Germany.
19.
PinskyRSabharwallPHartvigsenJO’BrienJ. Comparative review of hydrogen production technologies for nuclear hybrid energy systems. Prog Nucl Energy2020; 123: 103317.
20.
DvoynikovMBuslaevGKunshinASidorovDKraslawskiABudovskayaM. New concepts of hydrogen production and storage in Arctic region. Resources2021; 10(1): 3.
21.
WhiteCSteeperRLutzA. The hydrogen-fueled internal combustion engine: a technical review. Int J Hydrogen Energy2006; 31(10): 1292–1305.
22.
ChristophKCartellieriWPfeiferU. Die Bewertung der Klopffestigkeit von Kraftgasen mittels Methanzahl und deren praktische Anwendung bei Gasmotoren 1971. MTZ1971; 33: 391–403.
23.
ChenYRaineR. Engine Knock in an SI engine with hydrogen supplementation under stoichiometric and lean conditions. SAE Int J Engines2014; 7(2): 595–605.
24.
YipHLSrnaAYuenACY, et al. A review of hydrogen direct injection for internal combustion engines: towards carbon-free combustion. Appl Sci2019; 9(22): 4842.
25.
YiPLongWFengLWangWLiuC. An experimental and numerical study of the evaporation and pyrolysis characteristics of lubricating oil droplets in the natural gas engine conditions. Int J Heat Mass Transf2016; 103: 646–660.
26.
KoeserPDinkelackerF. Investigation of anomalous combustion behavior of medium speed natural gas engines and their impact on future engine efficiency potentials. In: 29. Deutscher Flammentag, 2019.
27.
EicheldingerSKarmannSPragerMWachtmeisterG. Optical screening investigations of backfire in a large bore medium speed hydrogen engine. Int J Engine Res2022; 23: 893–906.
28.
DuanJLiuFSunB. Backfire control and power enhancement of a hydrogen internal combustion engine. Int J Hydrogen Energy2014; 39(9): 4581–4589.
29.
HuynhTCKangJKNohKCLeeJTCatonJA. Controlling backfire for a hydrogen-fueled engine using external mixture injection. J Eng Gas Turbine Power2008; 130: 6.
30.
LuoQHSunBG. Inducing factors and frequency of combustion knock in hydrogen internal combustion engines. Int J Hydrogen Energy2016; 41(36): 16296–16305.
31.
DhyaniVSubramanianKA. Fundamental characterization of backfire in a hydrogen fuelled spark ignition engine using CFD and experiments. Int J Hydrogen Energy2019; 44(60): 32254–32270.
32.
EicheldingerSBartkowskiTSchröderAPragerDIMWachtmeisterPDIG. Experimental investigation on the influence of brake mean effective pressures up to 30 bar on the behavior of a large bore otto gas engine. SAE technical paper 2019-01-2224, 2019.
33.
EicheldingerSPragerMWachtmeisterGNguyenHDDohrmannSDinkelackerF. Development of a combustion process for gas engines with mean effective pressure above 30 bar while complying with the TA-Luft. In: 11th Dessau gas engine conference 2019, 2019, pp.44–56
34.
SchröderASchedlbauerTWachtmeisterG, et al. Abschlussbericht Formaldehyd. Frankfurt am Main: FVV eV, 2017.
35.
EicheldingerSWachtmeisterGNguyenHDDinkelackerF. Combustion development for gas engines with extreme BMEPs above 30 bar. MTZ Worldw2019; 80(6): 96–103.
36.
WeberSStegmannRPragerMWachtmeisterG. The effect of inlet valve timing and engine speed on dual fuel NG-Diesel combustion in a large bore engine. SAE Int J Engines2018; 11(2): 229–246.
37.
KorbBKuppaKNguyenHDDinkelackerFWachtmeisterG. Experimental and numerical investigations of charge motion and combustion in lean-burn natural gas engines. Combust Flame2020; 212: 309–322.
38.
GleisSFranklSPragerMWachtmeisterG. Optical analysis of the combustion of potential future E-Fuels with a high pressure dual fuel injection system. In: 14. Internationales AVL Powertrain Diagnostik 2020, 23–24June2020.
39.
BartkowskiTEicheldingerSPragerMWachtmeisterG. Effects of ambient air humidity on emissions and efficiency of large-bore lean-burn otto gas engines in development and application. In: ASME 2020 power conference, p.08042020. New York, NY: American Society of Mechanical Engineers.
40.
HuyskensPvan OostSGoemaerePJBertelsKPecqueurM. The technical implementation of a retrofit hydrogen PFI system on a passenger car. SAE technical paper 2011-01-2004, 2011.
JanssonJ. Vanadia-based catalysts for Mobile SCR. In: NovaITronconiE (eds) Urea-SCR technology for deNOx after treatment of diesel exhausts. Fundamental and applied catalysis. New York, NY: Springer, 2014, pp.65–96.
44.
ChoCPPyoYDJangJYKimGCShinYJ. NOx reduction and N2O emissions in a diesel engine exhaust using Fe-zeolite and vanadium based SCR catalysts. Appl Therm Eng2017; 110: 18–24.
