The Performance and Emissions of a Conventional Natural Gas/Diesel Dual Fuel Engine at Various Operating Conditions

Kozarac, Darko; Sremec, Mario; Božić, Mladen; Vučetić, Ante

doi:10.4271/2019-01-1158

Cited by 10 publications

(3 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The compiled interpolated maps (Figures 5-10) show the concentration of the exhaust gas's various components as a function of the share of gaseous fuel and the engine load at constant rotational speed (1500 rpm). To better analyze the emissions from the dual-fuel engine, the results of in-cylinder pressure tests under similar conditions are quoted [66], indicating the variation of in-cylinder pressure with respect to the NG share. Additionally, the effect of liquid fuel injection pressure was evaluated, which was negligible for the high NG share, whereas it was significant for the 50% NG share, and accelerated the start of injection (SOI) significance.…”

Section: Emission Characteristic Of Dual Fuel Combustion Processmentioning

confidence: 99%

Multifaceted Comparison Efficiency and Emission Characteristics of Multi-Fuel Power Generator Fueled by Different Fuels and Biofuels

et al. 2021

View full text Add to dashboard Cite

The negative effect of liquid and gaseous fuel combustion is toxic gases (i.e., carbon and nitrogen oxides NOx) and particulate matter (PM) formation. The content of harmful and toxic components of exhaust gases is strongly dependent on the quality and type of burnt fuel. Experimental research is required to verify the use of current technical and technological solutions for the production of electricity on farms, using various types of conventional fuels and biofuels. The aim of the current research was to comprehensively verify the use of commonly available fuels and biofuels without adapting the internal combustion engine. Gaseous fuels—propane-butane mixture (LPG), compressed natural gas (CNG) and biogas (BG)—were added to liquid fuels—methyl esters of higher fatty acids (RME) and diesel fuel (DF)—in six different power configurations to evaluate the effect on the emission of toxic gases: carbon monoxide (CO), nitric oxide (NO), nitric dioxide (NO2) and particulate matter (PM), and the efficiency of fuel conversion. The use of RME in various configurations with gaseous fuels increased the emission of oxides and reduced the emission of PM. Increasing the share of LPG and CNG significantly increased the level of NO emissions. The use of gaseous fuels reduced the efficiency of the generator, particularly in the case of co-firing with DF. For medium and high loads, the lowest decrease in efficiency was recorded for the RME configuration with BG. Taking into account the compromise between individual emissions and the configuration of RME with BG, the most advantageous approach is to use it in power generators.

show abstract

Section: Emission Characteristic Of Dual Fuel Combustion Processmentioning

confidence: 99%

Multifaceted Comparison Efficiency and Emission Characteristics of Multi-Fuel Power Generator Fueled by Different Fuels and Biofuels

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The lower reactivity of the natural gas Energies 2023, 16, 7899 2 of 16 causes a delay in the start of combustion at high natural gas premix ratios. Kozarac et al [7] investigated the effect of load and injection timing on hydrocarbon emissions. The fuel-rich zone under low load conditions produced higher hydrocarbon emissions, and the increase in turbulence intensity in the combustion chamber after increasing the load resulted in lower hydrocarbon emissions.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Parameter Sensitivity on Engine Optimization Results

Jiang,

Zeng,

et al. 2023

Energies

View full text Add to dashboard Cite

The effects of six control parameters, intake valve opening timing (IVO), exhaust valve opening timing (EVO), compression ratio (CR), engine speed, intake temperature, and intake pressure on engine output power, indicated specific fuel consumption (ISFC), and nitrogen oxides (NOx) emissions, are analyzed through engine simulation. The six parameters were categorized into two groups based on the degree of influence: high influence (EVO, speed and intake pressure) and low influence (CR, IVO and intake temperature). The relationship between these two groups of parameters and power, ISFC and NOx emissions was explored. Optimization was carried out for each of the two groups of parameters, and the optimization of the high impact parameters resulted in a higher diversity and wider distribution of the solution set. On the other hand, the optimization of the low-impact parameters resulted in a more concentrated distribution of the solution set, while better reflecting the trade-off between the optimization objectives. For the optimal solutions for both sets of parameters, the high-impact parameters provided significant optimization performance compared to the standard operating conditions. Although power and ISFC were optimized, the optimal solution for the low-impact parameter performed poorly with a significant increase in NOx emissions. Therefore, the parameters should be evaluated for optimization using high impact parameters to improve engine performance.

show abstract

“…However, the researchers still have to address some issues, in particular the poor combustion efficiency that characterizes DF operation at low loads. In these operating conditions, the premixed NG-air mixture is too lean to guarantee the propagation of a stable and self-sustaining flame front, determining high CO and Unburnt Hydrocarbons (UHC) emissions and low BTE, as confirmed by Hutter et al 25 and Kozarac et al, 26 which suggest beyond total excess air ratio of 1.65, the switch to CDC mode should be made to obtain higher indicated efficiency. Li et al 27 carried out a detailed CFD-3D investigation on a HD Diesel engine operated in DF NG-diesel mode at 910 rpm, 4.05 bar Brake Mean Effective Pressure (BMEP) in order to quantify the amount of UHC (in particular, methane) emitted by the engine.…”

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

View full text Add to dashboard Cite

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.

show abstract

The Performance and Emissions of a Conventional Natural Gas/Diesel Dual Fuel Engine at Various Operating Conditions

Cited by 10 publications

References 27 publications

Multifaceted Comparison Efficiency and Emission Characteristics of Multi-Fuel Power Generator Fueled by Different Fuels and Biofuels

Multifaceted Comparison Efficiency and Emission Characteristics of Multi-Fuel Power Generator Fueled by Different Fuels and Biofuels

Study on the Effect of Parameter Sensitivity on Engine Optimization Results

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

Contact Info

Product

Resources

About

The Performance and Emissions of a Conventional Natural Gas/Diesel Dual Fuel Engine at Various Operating Conditions

Cited by 10 publications

References 27 publications

Multifaceted Comparison Efficiency and Emission Characteristics of Multi-Fuel Power Generator Fueled by Different Fuels and Biofuels

Multifaceted Comparison Efficiency and Emission Characteristics of Multi-Fuel Power Generator Fueled by Different Fuels and Biofuels

Study on the Effect of Parameter Sensitivity on Engine Optimization Results

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

Contact Info

Product

Resources

About

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