Combustion and soot characteristics of hydrotreated vegetable oil compression-ignited spray flames

Bjørgen, Karl Oskar Pires; Emberson, David R.; Løvås, Terese

doi:10.1016/j.fuel.2019.116942

Cited by 23 publications

(5 citation statements)

References 37 publications

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“…However, the flashing frequency of the LED was set as quarter of the camera frame rate to capture a LED image between every three consecutive dark images. This configuration was used to deal with the non-ideal CMOS sensor behavior, that occurs when the camera is exposed to a sudden change in light intensity between two consecutive frames [18]. The flame luminosity from dark image before the LED image (third dark image) was quantified and used to isolate the transmitted LED light from the total registered radiation.…”

Section: Diffused Back Illumination (Dbi) Extinction Imagingmentioning

confidence: 99%

“…Even though, these alternative fuels have proved to be environmentally friendly, the study of their spray characteristics and combustion behavior is of importance for a complete understanding of their effects on the exhaust emissions [18]. In this sense, optical techniques are very helpful and effective tools to evaluate combustion progress and soot formation and oxidation [7,19].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of the Effect of Hydrotreated Vegetable Oil and Oxymethylene Ethers on Main Spray and Combustion Characteristics under Engine Combustion Network Spray A Conditions

et al. 2020

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The stringent emission regulations have motivated the development of cleaner fuels as diesel surrogates. However, their different physical-chemical properties make the study of their behavior in compression ignition engines essential. In this sense, optical techniques are a very effective tool for determining the spray evolution and combustion characteristics occurring in the combustion chamber. In this work, quantitative parameters describing the evolution of diesel-like sprays such as liquid length, spray penetration, ignition delay, lift-off length and flame penetration as well as the soot formation were tested in a constant high pressure and high temperature installation using schlieren, OH∗ chemiluminescence and diffused back-illumination extinction imaging techniques. Boundary conditions such as rail pressure, chamber density and temperature were defined using guidelines from the Engine Combustion Network (ECN). Two paraffinic fuels (dodecane and a renewable hydrotreated vegetable oil (HVO)) and two oxygenated fuels (methylal identified as OME1 and a blend of oxymethylene ethers, identified as OMEx) were tested and compared to a conventional diesel fuel used as reference. Results showed that paraffinic fuels and OMEx sprays have similar behavior in terms of global combustion metrics. In the case of OME1, a shorter liquid length, but longer ignition delay time and flame lift-off length were observed. However, in terms of soot formation, a big difference between paraffinic and oxygenated fuels could be appreciated. While paraffinic fuels did not show any significant decrease of soot formation when compared to diesel fuel, soot formed by OME1 and OMEx was below the detection threshold in all tested conditions.

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Section: Diffused Back Illumination (Dbi) Extinction Imagingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Effect of Hydrotreated Vegetable Oil and Oxymethylene Ethers on Main Spray and Combustion Characteristics under Engine Combustion Network Spray A Conditions

et al. 2020

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“…Biodiesel being highly viscous faces issues of cold flow property which may affect cold start performance and fuel injection in the engine. 101,102 monoglycerides, and diglycerides) which are further converted into alkanes via pathways namely 103 (i) Hydrodeoxygenation (HDO) (ii) Hydrogenation (iii) Hydrodecarboxylation (HDC). HVO has a higher combustion value attributing to low density due to paraffinic nature, improved hydrogen content, and low lubricity due to absence of oxygen and sulfur.…”

Section: Hydrotreated Vegetable Oils (Hvo)mentioning

confidence: 99%

Nanomaterials: stimulants for biofuels and renewables, yield and energy optimization

et al. 2021

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“…Green diesel has no cycloalkanes and aromatic compounds, which results in less soot emissions. In addition, it is mainly based on isoalkanes, resulting in a high cetane number, making it highly adequate for CI engines . Several studies have addressed the effects of using green diesel as a substitute or a mixture to mineral diesel.…”

Section: Green Diesel On Compression Ignition (Ci) Engine Performancementioning

confidence: 99%

“…Bjørgen et al 89 evaluated characteristics of combustion and soot of hydrotreated vegetable oil compression-ignited spray flames compared to mineral diesel and biodiesel from alkaline transesterification. They found higher soot production for the mineral diesel, and the biodiesel and green diesel presented similar soot concentrations.…”

Section: Green Diesel On Compression Ignition (Ci)mentioning

confidence: 99%

Potential of Green Diesel To Complement the Brazilian Energy Production: A Review

2020

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The introduction of biodiesel to the energy production of Brazil occurred mainly because of a legislative incentive that delimits minimum contents of this biofuel to be added to conventional diesel in the whole country. Despite the growth prospects for this sector, there are several difficulties related to the use of biodiesel in combustion engines. Hydroprocessed diesel or green diesel is a viable alternative of renewable biofuel to complement the conventional diesel production; it presents several technical and economic advantages over the biodiesel produced through the transesterification process. Therefore, the purpose of this work was to gather technical information about green diesel, compare it to biodiesel, and analyze the potential of introducing this biofuel to the energy production in Brazil as a substitute or a complementary alternative to conventional diesel. Green diesel stands out technically, mainly when produced from residual raw materials. Considering green diesel production only from fatty waste, it is estimated to serve approximately 55% of the biodiesel demand in Brazil, today produced mostly from crude soybean oil. In addition, the production of this biofuel may occur in existing plants of oil processing through minor adaptations, which ensures reduced installation costs, production, and logistics, especially when considering the current installed capacity in the country. The biggest deadlock related to large-scale production of green diesel in oil refineries in Brazil is the lack of specific legislation that regulates and defines parameters and conditions for the marketing of biofuel.

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Combustion and soot characteristics of hydrotreated vegetable oil compression-ignited spray flames

Cited by 23 publications

References 37 publications

Experimental Study of the Effect of Hydrotreated Vegetable Oil and Oxymethylene Ethers on Main Spray and Combustion Characteristics under Engine Combustion Network Spray A Conditions

Experimental Study of the Effect of Hydrotreated Vegetable Oil and Oxymethylene Ethers on Main Spray and Combustion Characteristics under Engine Combustion Network Spray A Conditions

Nanomaterials: stimulants for biofuels and renewables, yield and energy optimization

Potential of Green Diesel To Complement the Brazilian Energy Production: A Review

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