Study on marine engine combustion and emissions characteristics under multi-parameter coupling of ammonia-diesel stratified injection mode

Liu, Long; Wu, Jie; Liu, Haifeng; Wu, Yue; Wang, Yan

doi:10.1016/j.ijhydene.2022.12.065

Cited by 39 publications

(6 citation statements)

References 30 publications

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“…The NOx emissions were considerably reduced when the ASR40% combustion operation was used. This was caused by the addition of NH 3 , which caused thermal stratification and absorbed thermal energy, decreasing the local in-cylinder combustion temperature where NOx actively develops …”

Section: Resultsmentioning

confidence: 99%

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Experimental Studies to Reduce Usage of Fossil Fuels and Improve Green Fuels by Adopting Hydrogen–Ammonia–Biodiesel as Trinary Fuel for RCCI Engine

Ramachandran,

Krishnaiah,

Perumal Venkatesan

et al. 2023

ACS Omega

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This study investigates the feasibility of hydrogen addition to achieve lower emissions and higher thermal efficiency in an ammonia−biodiesel-fueled reactivity-controlled compression ignition (RCCI) engine. A single-cylinder light-duty water-cooled compression ignition (CI) engine was adapted to run in RCCI combustion with port-injected ammonia and hydrogen as low reactive fuel (LRF) and direct-injected algal biodiesel as high reactive fuel (HRF). In our earlier study, the ammonia substitution ratio (ASR) was optimized as 40%. To optimize fuel and engine settings, hydrogen is added in quantities ranging from 5 to 20% by energy share. The combustion, performance, and emission characteristics were investigated for the trinary fuel operation. The result shows that the 20% hydrogen premixing with 40% ammonia−biodiesel RCCI operation increased the peak cylinder pressure (CP), peak heat release rate (HRR), and cumulative heat release rate (CHRR) by 15.12, 25.15, and 26.68%, respectively. Ignition delay (ID) and combustion duration (CD) were decreased by 15.53 and 11.24%, respectively. The combustion phasing angle was advanced by 4 °CA. The brake thermal efficiency (BTE) was improved by 15.49%, and brake specific energy consumption (BSEC) was reduced by 21.92%. While the nitrogen oxide (NOx) level was significantly increased by about 31.82%, the hydrocarbon (HC), carbon monoxide (CO), smoke, and exhaust gas temperature (EGT) were reduced by 24.53, 28.16, 25.82, and 17.47% as compared to the optimized ASR40% combustion.

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Section: Resultsmentioning

confidence: 99%

“…This was caused by the addition of NH 3 , which caused thermal stratification and absorbed thermal energy, decreasing the local in-cylinder combustion temperature where NOx actively develops. 37 3.3.4. Smoke Opacity.…”

Section: Nitrogen Oxide Emissionmentioning

confidence: 99%

Experimental Studies to Reduce Usage of Fossil Fuels and Improve Green Fuels by Adopting Hydrogen–Ammonia–Biodiesel as Trinary Fuel for RCCI Engine

Ramachandran,

Krishnaiah,

Perumal Venkatesan

et al. 2023

ACS Omega

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“…Qian et al [26] established a CFD model to quantitatively analyze the formation processes of different types of NOx and optimize the fuel injection timing to improve combustion efficiency for a marine diesel engine with a cylinder diameter of 230 mm. Liu et al [27] studied an ammonia diesel stratified injection (ADSI) mode and found that it had higher thermal efficiency than the original diesel engine, significantly reducing greenhouse gas (GHG) emissions. Nadimi et al [28] used a one-dimensional model to calculate combustion characteristic indicators for ammonia-diesel engines, revealing that N 2 O generated from ammonia combustion offset the reduction in CO 2 emissions.…”

Section: Introductionmentioning

confidence: 99%

Study on the Impact of Ammonia–Diesel Dual-Fuel Combustion on Performance of a Medium-Speed Diesel Engine

Xiao,

Ying,

Chen

et al. 2024

JMSE

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The combustion of diesel fuel in internal combustion engines faces challenges associated with excessive emissions of pollutants. A direct solution to this issue is the incorporation of cleaner energy sources. In this study, a numerical model was constructed to investigate the characteristics of ammonia–diesel dual-fuel application in a medium-speed diesel engine. Effects of ammonia–diesel blending ratios on engine performance and emissions were investigated. The results indicate that for this engine model, the optimal diesel energy ratio is about 22%. When the diesel energy ratio is less than 22%, the engine’s output performance is significantly affected by the diesel energy ratio, while above 22%, the influence of the intake becomes more pronounced. When the diesel energy ratio is below 16%, the cylinder cannot reach combustion conditions. Diesel energy ratios below 22% can cause ammonia leakage. With increasing diesel energy ratio, the final emissions of carbon oxides increase. With a higher diesel energy ratio, NO emissions become lower. When the diesel fuel energy ratio exceeds 22%, the N2O emissions can be almost neglected, while below 22%, with poor combustion conditions inside the cylinder, the N2O emissions will increase.

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“…Applying the dual-fuel (DF) combustion mode is an effective way to improve the combustion stability. It is a practical strategy to burn ammonia in marine engines. , The low-reactivity fuel, ammonia, is ignited by high-reactivity fuels, such as diesel. Ammonia can be injected into the intake manifold, forming a premixed mixture, which is subsequently compressed during the compression stroke.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Ignition and Flame Propagation of Ammonia/n-Heptane Dual Fuels

Zhao,

Li,

Sun

et al. 2023

Energy Fuels

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Ammonia is carbon-free and thus is a promising renewable fuel for carbon neutrality. However, because ammonia has low reactivity and narrow flammability range, blended fuels of ammonia/n-heptane are often used to trigger high-temperature combustion in internal combustion engines. In this study, the ignition and flame propagation of ammonia/n-heptane dual-fuels were investigated in a specified mixing layer using a skeletal mechanism via a high-fidelity simulation. The results showed that auto-ignition was initiated at the locations of the most reactive mixture fraction ξmr calculated by the zero-dimensional homogeneous reactor model. Two cool and hot flame fronts were observed to propagate both toward the fuel-lean and fuel-rich regions. A stabilized hot flame front identified by the temperature isoline was observed in the fuel-rich region as a result of the low reaction rates and adiabatic flame temperatures. The temperature of the pilot fuel (T Fuel) significantly affected the flame structures in the presence of compositional stratification. When T Fuel was increased, the dual-fuel flame structure transitioned from quadruple peaks in the heat release rate (HRR) profiles at 800 K to double peaks at 900 K and to a single peak at 1000 K. The propagation of the flame front was controlled by the cool flame during the early stage and the gradient of the ignition delay times. Subsequently, it transformed into a diffusion-driven flame. Finally, the average HRR profiles had double peaks at 800–1000 K owing to the presence of cool and hot flames. Ammonia is expected to promote the oxidization of n-heptane via the active reaction NO+HO2 ⇌ NO2 + OH at 800 K, causing a high peak of HRR.

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Study on marine engine combustion and emissions characteristics under multi-parameter coupling of ammonia-diesel stratified injection mode

Cited by 39 publications

References 30 publications

Experimental Studies to Reduce Usage of Fossil Fuels and Improve Green Fuels by Adopting Hydrogen–Ammonia–Biodiesel as Trinary Fuel for RCCI Engine

Experimental Studies to Reduce Usage of Fossil Fuels and Improve Green Fuels by Adopting Hydrogen–Ammonia–Biodiesel as Trinary Fuel for RCCI Engine

Study on the Impact of Ammonia–Diesel Dual-Fuel Combustion on Performance of a Medium-Speed Diesel Engine

Numerical Study on the Ignition and Flame Propagation of Ammonia/n-Heptane Dual Fuels

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