Emissions and performance of diesel–natural gas dual-fuel engine operated with stoichiometric mixture

Vávra, Jiří; Bortel, Ivan; Takáts, Michal; Diviš, Marcel

doi:10.1016/j.fuel.2017.07.057

Cited by 48 publications

(15 citation statements)

References 19 publications

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“…At 80% substitution rate at low load, longer ignition delay periods resulting from more lean mixtures might produce more zones with high temperature in the cylinder compared to medium load, thereby increasing the emissions of NOx and CO2. The reduction of CO2 with the increase of substitution rate is due to the low carbon content in natural gas under the condition of constant energy input [33]. In terms of the characteristic soot emissions, with the increase of substitution rate the soot increases to a small extent at low load (see Figure 10).…”

Section: Emissions Characteristicsmentioning

confidence: 98%

Experimental Study on the Effects of Air Supply Control on Combustion and Emissions Performance at Medium and Low Load for a Dual-Fuel Diesel Engine

et al. 2018

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Lowering the amount of excess air is believed to increase the density of the air-fuel mixture and help improve the combustion rate for compression ignition engines. This paper proposes an approach of adding a throttle body at the intake pipe to control the excess air ratio with reduction of air supply to achieve a better balance between the power, emissions and fuel efficiency at medium and low load of a natural gas dual-fuel diesel engine converted from a conventional diesel engine. Various experiments in both pure diesel and dual-fuel mode under intermediate engine speed are performed with the proposed critical method of excess air ratio control. The experimental results reveal that better excess air ratio is very beneficial for the power output and brake specific energy consumption in dual-fuel combustion under medium and low load conditions. Moreover, the substitution rate can reach as high as 40% under low load conditions with throttle control.

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Section: Emissions Characteristicsmentioning

confidence: 98%

Experimental Study on the Effects of Air Supply Control on Combustion and Emissions Performance at Medium and Low Load for a Dual-Fuel Diesel Engine

et al. 2018

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“…Only liquid phase properties can be measured/evaluated as it is a cold device. More details can be found in [25]. Regarding the calibration procedure itself for the case of LES spray, the outcome was found satisfactory - Figure 4 shows the comparison of a calibrated model versus the experimental data.…”

Section: Model Calibrationmentioning

confidence: 95%

Application of Advanced Combustion Models in Internal Combustion Engines Based on 3-D CFD Les Approach

et al. 2021

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This paper deals with the application of advanced simulation techniques for combustion modeling in the case of an internal combustion engine. The main focus is put on models with a high predictive ability hence 3-D CFD was selected while using LES (turbulence model) and detailed chemistry (both SI and CI ICE) or turbulent flame propagation (SI ICE). Both engine types are considered – spark ignited ICE and a compression ignited engine. Examples are shown and comparison with available experimental data is presented. The main conclusion is that such models are capable of high quality predictions while very little tuning is needed. This is desired as such models could be applied in the early phases of ICE development. On the other hand, such calculations are very demanding in terms of computational power.

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“…Emission factors depend strongly on engines specifics and the operating conditions which largely vary in consequence of the different applications. Therefore, a broad range of emissions factors has been reported in literature (Maji et al 2008;Coppola and Quaranta 2014;Vávra et al 2017;Zheng et al 2019). In order to compare SOFC to DF engine, just for a rough evaluation, we considered average values and the variability range of emissions factors of DF engine depending only by the fuel consumption that are obtained from literature data.…”

Section: Emissionsmentioning

confidence: 99%

A Case Study of a Solid Oxide Fuel Cell Plant on Board a Cruise Ship

Micoli

Coppola

Turco

2021

J. Marine. Sci. Appl.

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The work is a case study of a cruise ship supplied by liquefied natural gas (LNG) and equipped with a solid oxide fuel cell (SOFC). It is supposed that a 20 MW SOFC plant is installed on-board to supply hotel loads and assisting three dual-fuel (DF) diesel/LNG generator sets. LNG consumption and emissions are estimated both for the SOFC plant and DF generator sets. It results that the use of LNG-SOFC plant in comparison to DF generator sets allows to limit significantly the SOx, CO, NOx, PM emissions and to reduce the emission of CO2 by about 11%. A prediction of the weight and volume of the SOFC plant is conducted and a preliminary modification of the general arrangement of the cruise ship is suggested, according to the latest international rules. It results that the SOFC plant is heavier and occupies more volume on board than a DF gen-set; nevertheless, these features do not affect the floating and the stability of the cruise ship.

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Emissions and performance of diesel–natural gas dual-fuel engine operated with stoichiometric mixture

Cited by 48 publications

References 19 publications

Experimental Study on the Effects of Air Supply Control on Combustion and Emissions Performance at Medium and Low Load for a Dual-Fuel Diesel Engine

Experimental Study on the Effects of Air Supply Control on Combustion and Emissions Performance at Medium and Low Load for a Dual-Fuel Diesel Engine

Application of Advanced Combustion Models in Internal Combustion Engines Based on 3-D CFD Les Approach

A Case Study of a Solid Oxide Fuel Cell Plant on Board a Cruise Ship

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