Regulated and Unregulated Emissions from Methanol Fuelled Engines

Valera, Hardikk; Čedík, J.; Pexa, Martin; Ágarwal, Avinash Kumar

doi:10.1007/978-981-16-1224-4_7

Cited by 5 publications

(5 citation statements)

References 45 publications

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“…26 Consequently, the CP peak becomes higher and shifts nearer to TDC, which results in a higher cylinder temperature, which promotes the thermal or zeldovic NOx formation mechanism. 41,53 In the present work also, high NOx emissions were noted when CP was high ((Supplementary Figures 1(a) to (c) and 2(a) to (c)). Moreover, at part load, the lowest NOx was observed at retarded IT of 8.2° BTDC and an IP of 35 MPa, where minimum in-cylinder pressure and temperature were noted (Figures 2(d) and 5(a); Supplementary Figure 1(a)).…”

Section: Resultssupporting

confidence: 74%

An investigation of optimum control of injection timing/injection pressure for a multicylinder common rail direct injection engine fueled with AB20 blend

Singh

Kumar

Sandhu

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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A multicylinder turbocharged common rail direct injection engine was tested at part load (62.4 Nm) and high load (156 Nm) to determine the optimum combination of injection pressure (IP) and injection timing (IT) for AB20 blended fuel. IP and IT were varied from default settings, that is, 9.2° before top dead center (BTDC), 45 MPa at part load; 9.8° BTDC, 95 MPa at high load, as specified in the calibration map of the engine. As a result of the experimental results, brake thermal efficiency (BTE) increased up to 5.36% when IP increased from 35 MPa to 45 MPa and 0.72% when IP increased from 45 MPa to 55 MPa under the part load condition. At high load, the maximum BTE of 38.22% was attained at 105 MPa IP and 9.8° BTDC IT. At this condition, nitrogen oxide (NOx) emission was noted as 1353 ppm, which is 12.28% higher than the NOx noted for diesel fuel at the default IP and IT conditions. When IP increases from 35 to 55 MPa at part load and 85–105 MPa at high load, cylinder pressure, heat release rate, and rate of pressure rise increase at all tested ITs. At high load, the condition of retarded IT (8.8° BTDC) and default IP (95 MPa) shows (a) 2.35% higher BTE and (b) almost similar NOx and improved HC, CO, and smoke emissions for the AB20 blend. Moreover, at the same experimental conditions, premixed heat release for the AB20 blend was noted to be 70.16 J/Deg./C.A, with heat release rate peak at 6° ATDC.

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Section: Resultssupporting

confidence: 74%

An investigation of optimum control of injection timing/injection pressure for a multicylinder common rail direct injection engine fueled with AB20 blend

Singh

Kumar

Sandhu

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…These injection techniques can alter the performance of the compression-ignition (CI) engines. 56 All other injection techniques are mentioned in detail in the literature 47 ; in the context of large-bore marine engines, an essential HPDI technique is discussed in the present editorial. Without compromising the overall engine performance, the HPDI technique displaces a maximum amount of diesel with methanol and reduces exhaust emissions.…”

Section: Technological Route For Methanol Use In Four-stroke Marine E...mentioning

confidence: 99%

“…Methanol combustion with 5% pilot-injected diesel improves the thermal efficiency and emission characteristics. 47 An electronic fuel injection system is needed to improve the performance of existing marine diesel engines operated with mechanical fuel injection systems. Large-bore engines benefit from electronic fuel injection systems to meet strict emission norms by optimizing various injection parameters concerning varying loads and speeds.…”

Section: Technological Route For Methanol Use In Four-stroke Marine E...mentioning

confidence: 99%

The future of ship engines: Renewable fuels and enabling technologies for decarbonization

Curran,

Onorati,

Payri

et al. 2023

International Journal of Engine Research

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Shipping is one of the most efficient transportation modes for moving freight globally. International regulations concerning decarbonization and emission reduction goals drive rapid innovations to meet the 2030 and 2050 greenhouse gas reduction targets. The internal combustion engines used for marine vessels are among the most efficient energy conversion systems. Internal combustion engines dominate the propulsion system architectures for marine shipping, and current marine engines will continue to serve for several decades. However, to meet the aggressive goals of low-carbon-intensity shipping, there is an impetus for further efficiency improvement and achieving net zero greenhouse gas emissions. These factors drive the advancements in engine technologies, low-carbon fuels and fueling infrastructure, and emissions control systems. This editorial presents a perspective on the future of ship engines and the role of low-life cycle-carbon-fuels in decarbonizing the marine shipping sector. A selection of zero-carbon, net-zero carbon, and low-lifecycle-carbon-fuels are reviewed. This work focuses on the opportunities and challenges of displacing distillate fossil fuels for decarbonizing marine shipping. Enabling technologies such as next-generation air handling, fuel injection systems, and advanced combustion modes are discussed in the context of their role in the future of low-CO2 intensity shipping.

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“…7–11 It has been demonstrated in several studies that LTC combustion techniques combined with renewable higher RON fuel could achieve high BTE while producing ultra-low NO X levels and smoke in most CI engines under most operating conditions. 2,11–13 The researchers discovered that higher alcohol levels in biodiesel reduced density and ignition quality, but BTE improved by 30% with 8.9% biodiesel blending. 14 Aoyama et al 15 indicated that the PPC method, which offers coupling across the start of combustion (SOC) and SOI, might be used to decrease the rapid pressure rise rate (PRR).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the increasing scarcity of fossil fuels, energy security concerns, and environmental pollution have intensified research into the use of clean renewable fuels in a variety of power plants and daily life sectors, such as automotive and transportation sectors, urban traffic transportation, and power generating devices. 1–3 Among all sectors, the transportation industry has been one of the significant consumers of fossil fuels and contributors to environmental pollution. ICE is the key prime movers for automotive and transportation vehicles.…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation into the combustion stability and emissions of an n-butanol/diesel blended fueled partially premixed compression ignition (PPCI) engine

Kumar

Sandhu

2022

International Journal of Engine Research

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Higher cyclic variability in internal combustion engines (ICE) increases driveability problems, specific fuel consumption, and exhaust emissions. Consequently, quantification of the combustion stability in different combustion parameters is essential for the design of closed-loop control for a partially premixed combustion (PPC). This research examines the impacts of a PPC strategy on the spectral features of IMEP combustion parameters for early, and late injection timings of a 4-cylinder CRDI engine using wavelet transforms (WT). Furthermore, operating points were optimized based on the combustion and emissions characteristics of the partially premixed compression ignition engine. Results indicated that the early start of injection (SOI) timing of 12° CA BTDC has a lower standard deviation in the time-series data of IMEP than the late SOI timing. Moreover, when the amount of n-butanol in diesel fuel was increased from 0% to 20% at a load of 2 bar BMEP, COVIMEP decreased from 3.1% to 2.75% at early SOI timing. The WT results reveal that the continuous strong intensity band pattern changes irregularly when the injection timing is advanced. It was also found that at lower cyclic variability conditions (SOI = 12°CA BTDC), CO and smoke emissions decreased, and there was a noticeable increase in NOx emissions.

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Regulated and Unregulated Emissions from Methanol Fuelled Engines

Cited by 5 publications

References 45 publications

An investigation of optimum control of injection timing/injection pressure for a multicylinder common rail direct injection engine fueled with AB20 blend

An investigation of optimum control of injection timing/injection pressure for a multicylinder common rail direct injection engine fueled with AB20 blend

The future of ship engines: Renewable fuels and enabling technologies for decarbonization

An experimental investigation into the combustion stability and emissions of an n-butanol/diesel blended fueled partially premixed compression ignition (PPCI) engine

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