An Experimental Study on the Effect of Exhaust Gas Recirculation on a Natural Gas-Diesel Dual-Fuel Engine

Dev, Shouvik; Guo, Hongsheng; Lafrance, Simon; Liko, Brian

doi:10.4271/2020-01-0310

Cited by 11 publications

(4 citation statements)

References 27 publications

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“…Dev et al [19]. investigated the impact of external EGR on a natural gas-diesel dual-fuel engine and reported a decrease in hydrocarbon emissions due to the longer combustion duration.…”

Section: Exhaust Gas Recirculationmentioning

confidence: 99%

“…Regarding the burn rate for the 75 % methane case, the curve shows two distinct sections. The first section represents the combustion of the injected diesel fuel, which in turn ignites the methane of the base mixture, thereby initiating the second part of the combustion [19]. This second phase of the combustion process is more rapid, which explains the difference of only 2 °CA in burn duration despite of the difference of 4 °CA in diesel injection timing.…”

Section: Nox -Soot Trade-off In Dual-fuel Combustionmentioning

confidence: 99%

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Investigation of a Second Exhaust Valve Lift to Improve Combustion in a Methane - Diesel Dual-Fuel Engine

Mueller¹,

Guenthner²,

Weigel³

et al. 2022

SAE Technical Paper Series

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In recent years, the utilization of dual-fuel combustion has gained popularity in order to improve engine efficiency and emissions. With its high knock resistance, methane allows operation in high compression diesel engines with lower risk of knocking. With the use of diesel fuel as an ignition source, it is possible to exploit the advantages of lean combustion without facing problems to provide the high amount of ignition energy necessary to burn methane under such operating conditions. Another advantage is the variety of sources from which the primary fuel can be obtained. In addition to fossil sources, methane can also be produced from biomass or electrical energy.

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“…Dev et al [19]. investigated the impact of external EGR on a natural gas-diesel dual-fuel engine and reported a decrease in hydrocarbon emissions due to the longer combustion duration.…”

Section: Exhaust Gas Recirculationmentioning

confidence: 99%

Section: Nox -Soot Trade-off In Dual-fuel Combustionmentioning

confidence: 99%

Investigation of a Second Exhaust Valve Lift to Improve Combustion in a Methane - Diesel Dual-Fuel Engine

Mueller¹,

Guenthner²,

Weigel³

et al. 2022

SAE Technical Paper Series

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show abstract

“…Second, EGR control would typically be outside the scope of a simple conversion of a diesel engine to operate as an NG-diesel dual-fuel engine. However, the importance of EGR in optimizing NG-diesel combustion cannot be overstated and EGR effects have been evaluated in a separate study (Dev et al, 2020). The test procedure involved the following steps for each load condition.…”

Section: Experimental Procedures and Conditionsmentioning

confidence: 99%

A Study on the High Load Operation of a Natural Gas-Diesel Dual-Fuel Engine

2020

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Diesel fueled compression ignition engines are widely used in power generation and freight transport owing to their high fuel conversion efficiency and ability to operate reliably for long periods of time at high loads. However, such engines generate significant amounts of carbon dioxide (CO2), nitrogen oxides (NOx), and particulate matter (PM) emissions. One solution to reduce the CO2 and particulate matter emissions of diesel engines while maintaining their efficiency and reliability is natural gas (NG)-diesel dual-fuel combustion. In addition to methane emissions, the temperatures of the diesel injector tip and exhaust gas can also be concerns for dual-fuel engines at medium and high load operating conditions. In this study, a single cylinder NG-diesel dual-fuel research engine is operated at two high load conditions (75% and 100% load). NG fraction and diesel direct injection (DI) timing are two of the simplest control parameters for optimization of diesel engines converted to dual-fuel engines. In addition to studying the combined impact of these parameters on combustion and emissions performance, another unique aspect of this research is the measurement of the diesel injector tip temperature which can predict potential coking issues in dual-fuel engines. Results show that increasing NG fraction and advancing diesel direct injection timing can increase the injector tip temperature. With increasing NG fraction, while the methane emissions increase, the equivalent CO2 emissions (cumulative greenhouse gas effect of CO2 and CH4) of the engine decrease. Increasing NG fraction also improves the brake thermal efficiency of the engine though NOx emissions increase. By optimizing the combustion phasing through control of the DI timing, brake thermal efficiencies of the order of ∼42% can be achieved. At high loads, advanced diesel DI timings typically correspond to the higher maximum cylinder pressure, maximum pressure rise rate, brake thermal efficiency and NOx emissions, and lower soot, CO, and CO2-equivalent emissions.

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“…Detailed studies have also been carried out to better understand the patterns of DF combustion: Niki et al 11 investigated the effects of methane on pilot-fuel ignition by means of chemical-kinetics simulations and imaging diagnostics; Rochussen and Kirchen 12 characterized the reaction zone growth rate through the premixed natural gas using high-speed imaging of OH*-chemiluminescence; Rochussen et al 13 were able to identify five distinct DF combustion phases thanks to combined heat release rate and OH*-chemiluminescence reaction zone analysis. Furthermore, investigations have been conducted in order to analyze the influence of fundamentals parameters affecting DF combustion, such as: NG composition, 14,15 Exhaust Gas Recirculation (EGR), 16 diesel injection strategy (number of shots, 17 injection timing, 18 injection duration, 19 post injection strategy 20 ), injector spray included angle, 21 diesel injector nozzle hole size, 22 swirl ratio, 23 combustion chamber shape 24 ). However, the researchers still have to address some issues, in particular the poor combustion efficiency that characterizes DF operation at low loads.…”

Section: Introductionmentioning

confidence: 99%

Influence of H₂ enrichment for improving low load combustion stability of a Dual Fuel lightduty Diesel engine

Mattarelli

Rinaldini

Caprioli

et al. 2021

International Journal of Engine Research

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Dual Fuel (DF) combustion can help to reduce the environmental impact of internal combustion engines, since it may provide excellent Brake Thermal Efficiency (BTE) combined with ultra-low emissions. This technique is particularly attractive when using biofuels, or fuels with a low Carbon content, such as Natural Gas (NG). Unfortunately, as engine load decreases and the homogeneous NG-air mixture tends to become very lean, the high chemical stability of NG can be a serious obstacle to the completion of combustion. As a result, BTE drops and UHC and CO emissions become very high. A possible way to address this problem could be the addition of hydrogen (H2) to the NG-air mixture. In this paper, a numerical study has been carried out on an automotive Diesel engine, modified by the authors in order to operate in both conventional Diesel combustion and DF NG-diesel mode. A previous experimental characterization of the engine is the basis for the CFD-3D modeling and calibration of the DF combustion process, using a commercial software. The effects on combustion stability and emissions of different NG-H2 mixtures (six blends with 5%, 10%, 15%, 20%, 25%, and 30% by volume of hydrogen) are numerically investigated at a low load (BMEP = 2 bar, engine speed 3000 rpm). The results of the CFD-3D simulations demonstrate that NG-H2 blends are able to decrease strongly CO, UHC, and CO2 emissions at low loads. Advantages are also found in terms of thermal efficiency and NOx emissions.

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An Experimental Study on the Effect of Exhaust Gas Recirculation on a Natural Gas-Diesel Dual-Fuel Engine

Cited by 11 publications

References 27 publications

Investigation of a Second Exhaust Valve Lift to Improve Combustion in a Methane - Diesel Dual-Fuel Engine

Investigation of a Second Exhaust Valve Lift to Improve Combustion in a Methane - Diesel Dual-Fuel Engine

A Study on the High Load Operation of a Natural Gas-Diesel Dual-Fuel Engine

Influence of H₂ enrichment for improving low load combustion stability of a Dual Fuel lightduty Diesel engine

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An Experimental Study on the Effect of Exhaust Gas Recirculation on a Natural Gas-Diesel Dual-Fuel Engine

Cited by 11 publications

References 27 publications

Investigation of a Second Exhaust Valve Lift to Improve Combustion in a Methane - Diesel Dual-Fuel Engine

Investigation of a Second Exhaust Valve Lift to Improve Combustion in a Methane - Diesel Dual-Fuel Engine

A Study on the High Load Operation of a Natural Gas-Diesel Dual-Fuel Engine

Influence of H2 enrichment for improving low load combustion stability of a Dual Fuel lightduty Diesel engine

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Influence of H₂ enrichment for improving low load combustion stability of a Dual Fuel lightduty Diesel engine