Investigation of the Combustion Kinetics Process in a High-Pressure Direct Injection Natural Gas Marine Engine

Li, Jingrui; Liu, Haifeng; Liu, Xinlei; Ye, Ying; Wang, Hu; Yao, Mingfa

doi:10.1021/acs.energyfuels.1c00353

Cited by 14 publications

(7 citation statements)

References 45 publications

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“…6 Besides, in the process of increasing EGR rate, the boost pressure is increased to maintain the equivalent ratio of the combustion process, which leads to higher PCP. 48 Therefore, PCP increases initially with increasing EGR rates because of the higher compression pressure before combustion in a certain range of EGR rates, and when EGR rate is relatively high, PCP starts to decrease because of the slower heat release process and the delay of combustion phase. In the lower part of Figure 2, it is also observed that with an increasing EGR rate, the maximum ROHR decreases, and its position is delayed due to an increase of EGR rate.…”

Section: Effect Of Egr On Combustion Characteristicsmentioning

confidence: 98%

“…Referring to Figure 11, BSFC of the engine decreases before sharply increasing with rising EGR rate. The dilution of inlet mixture reduced in-cylinder thermal and mechanical stresses which prevented surface ignition occurrence and decreased cylinder heat transfer, 48 which allows more advanced spark timing and resulted in a decrease in engine fuel consumption. However, when the EGR rate is large, CA50 moves away from TDC and DOC increases linearly, which increases phasing loss and combustion loss, the thermal efficiency decreases and thus engine fuel consumption is higher.…”

Section: Effect Of Egr On Performance and Emissionmentioning

confidence: 99%

“…This is due to the advance of CA50 and increase of PCP, which increases the thermal efficiency and reduces the after burn of unburned HC. 48 3.4. Effect of Spark Timing on Performance and Emission Characteristics.…”

Section: Effect Of Spark Timing On Combustionmentioning

confidence: 99%

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Study on the Effects of EGR and Spark Timing on the Combustion, Performance, and Emissions of a Stoichiometric Natural Gas Engine

et al. 2020

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This paper involved conducting an experimental investigation on the effects of exhaust gas recirculation (EGR) and spark timing on the combustion, performance, and emission characteristics of a China-VI heavy-duty, natural gas engine fueled with high-methane content. The results showed that increasing the EGR rate extends the spark timing range and slows the combustion. This then increases ignition delay, prolongs combustion duration, and decreases heat release rate. Peak in-cylinder pressure (PCP) and indicated thermal efficiency (ITE) initially increase because of higher boost pressure with increasing EGR rate. However, as EGR rate increases further, PCP and ITE begin to decrease because of the deviation of combustion phasing. Lower in-cylinder temperature caused by higher EGR rate may cause nitrogen oxide (NOx) emissions to reduce significantly, while total hydrocarbon (THC) and carbon monoxide (CO) emissions increase, and THC emissions could increase exponentially at high EGR rates. In-cylinder pressure, temperature, and heat release rate increase with early spark timing, but the rate of increase is reduced at higher engine speeds. Early spark timing causes THC and CO emissions to increase at part-load conditions, whereas there is little change at full-load conditions. NOx emissions also increase with early spark timing because of the higher in-cylinder temperature.

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Section: Effect Of Egr On Combustion Characteristicsmentioning

confidence: 98%

Section: Effect Of Egr On Performance and Emissionmentioning

confidence: 99%

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Study on the Effects of EGR and Spark Timing on the Combustion, Performance, and Emissions of a Stoichiometric Natural Gas Engine

et al. 2020

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“…Biogas is used to power an SI engine that powers a water irrigation pump (Abdel-Galil et al, 2008). The main representative exothermic reactions (REXRs) within the high heat release (HHR) region and the dominant formation reactions of CH 2 O and OH, which are known as the indicators of low heat release (LHR) and high heat release (HHR), respectively, were not significantly affected by the more advanced NG start-of-injection Frontiers in Mechanical Engineering frontiersin.org (SOI) timing, which resulted in a higher heat release rate (HRR) (Li et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Technical and economic evaluation of an engine and irrigation pump using a T-type mixer for natural gas

et al. 2023

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Energy is regarded as one of the most crucial resources in the industrial process. Numerous measurements were made in the year 2021 in the workshops of the Agricultural Engineering Department, Faculty of Agriculture, Ain Shams University, Egypt, using a gasoline engine (single cylinder with air-cooling) that was used to power an irrigation pump with a discharge diameter of 2 inches, which was manufactured in Egypt. To combine natural gas and air before entering the engine, a variety of mixers were created. Four different types of mixers were employed with iron pipes of various sizes: 90° angle T-mixer (T90), 45° angle T-mixer (T45), 30° angle T-mixer (T30), and venture mixer (VM). The engine shift speeds were set at 1,750, 2,300, 2,900, and 3,500 rpm. The water pump was powered by natural gas and gasoline. The findings in this study focused on the evaluation of technical indicators for several types of mixers that combine natural gas and air to power an irrigation pump, where the actual power (braking power) is superior to all types while operating with gasoline (3.07 kW). A commensurability on every side the report of on the up steam, in the mixer type (T45) (2.83 kW) was 7.8% about than gasoline. The lowest specific fuel consumption (S.fc) for gasoline was 219.025 gm/Kw.h at an engine speed of 2,900 rpm. The T45 mixer had the lowest S.fc of 234.612 gm/KW.h, compared with other types of mixers at an engine speed of 2,900 rpm, an increase of 6.6% compared with gasoline. The T45 mixer had the highest pump discharge of 528.133 L/min, an increase of 2.1% compared with gasoline. Compared with other types of T-mixers, the T45 mixer had the highest actual hydraulic power of 0.6 kW, which was 10.5% lower than that of gasoline. As for the economic indicators, the T90 mixer had the lowest net present value (NPV) of 77219.5, and the T45 mixer had the highest NPV of 106900.7. The mixer-type VM had the lowest benefit–cost ratio (B/C) of 1.38, and the T45mixer had the highest B/C of 1.54.

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“…Although many works of literature on diesel and NG dual-fuel combustion have been published including the zero-dimensional model [25,26] and the three-dimensional spray study [27,28], however, previous studies mainly focused on the ignition characteristics of diesel and NG mixture when diesel is injected into NG. ere is still an obvious gap in understanding the ignition and flame characteristics of H 2 and CO additives in different combinations of dual-fuel blends.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study of the Effects of Using Reformer Gas on Ignition Characteristics under Dual-Fuel Engine-Relevant Conditions

Junwu

Guo

2022

International Journal of Chemical Engineering

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Natural gas/diesel dual-fuel engine has become an urgent need to alleviate the energy crisis and reduce emissions. As an additive, reforming gas can improve the combustion process of dual-fuel engines because it improves the combustion rate and compensates for the low reactivity of natural gas. Therefore, it is of great significance to study the ignition characteristics of natural gas diesel blends by adding H2 and syngas. Based on ANSYS Chemkin 17.0 software, the ignition delay time was solved by a closed uniform model. The effects of H2 and syngas on the ignition performance of a natural gas/diesel engine were studied. The results showed that the ignition delay time of the methane/n-heptane mixture was prolonged after adding H2 in the range of medium and low temperatures. This was due to the fact that reaction R3 (OH + H2 = H + H2O) was an endothermic reaction, which consumed OH radicals and inhibited the ignition process. In the high-temperature range, adding H2 reduced the ignition delay time of the mixture system, which was because of the significant increase in the sensitivity coefficients of R1(H + O2 = O + OH) and R3 and the generation of OH radicals. Therefore, the reduction in ignition delay caused by H2 addition in the high-temperature regions was mainly attributed to R3 and R1. In syngas, CO reduced the ignition delay time of methane/syngas/n-heptane. However, the addition of CO could reduce the importance of R3 in the reaction process—resulting in the weakening of the influence of H2 on ignition delay. This study can expand the theoretical basis of ignition characteristics of methane/n-heptane mixture with H2 and syngas under dual-fuel engine-relevant conditions.

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Investigation of the Combustion Kinetics Process in a High-Pressure Direct Injection Natural Gas Marine Engine

Cited by 14 publications

References 45 publications

Study on the Effects of EGR and Spark Timing on the Combustion, Performance, and Emissions of a Stoichiometric Natural Gas Engine

Study on the Effects of EGR and Spark Timing on the Combustion, Performance, and Emissions of a Stoichiometric Natural Gas Engine

Technical and economic evaluation of an engine and irrigation pump using a T-type mixer for natural gas

A Numerical Study of the Effects of Using Reformer Gas on Ignition Characteristics under Dual-Fuel Engine-Relevant Conditions

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