Impact of different levels of biodiesel oxidation on its emission characteristics

Liu, Zuowen; Wang, Wenchao; Wang, Bican

doi:10.1016/j.joei.2018.06.012

Cited by 13 publications

(4 citation statements)

References 31 publications

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“…Misleading and controversial results are usually easy to find in the scientific literature. With the term NO x -penalty [15], researchers and technicians usually refer to the NO x emissions increase related to the use of oxygenated fuels (such as biodiesel), primarily due to a higher flame temperature and to the presence of fuel-bound oxygen, which is characteristic of biodiesel fuels in particular [15,24,25]. Other main issues related to the biodiesel NO x -penalty are: (i) the changes in spray characteristics due to differences in viscosity, surface tension, and fuel boiling point [15,26]; (ii) the absence of soot particles, due to leaner combustion thanks to the fuel-bound oxygen [15,26]; (iii) the influence of fuel and spray properties on the ignition delay, independently of fuel cetane number [15,26]; and (iv) the fuel chemical effects on the formation of the so-called prompt NO x [15,26].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and RSM Modeling of the Effects of Injection Timing on the Performance and NOx Emissions of a Micro-Cogeneration Unit Fueled with Biodiesel Blends

et al. 2022

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The (partial or total) substitution of petro-diesel with biodiesel in internal combustion engines (ICEs) could represent a crucial path towards the decarbonization of the energy sector. However, critical aspects are related to the controversial issue of the possible increase in Nitrogen Oxides (NOx) emissions. In such a framework, the proposed study aims at investigating the effects of biodiesel share and injection timing on the performance and NOx emissions of a diesel micro combined heat and power (CHP) system. An experimental campaign has been conducted considering the following operating conditions: (i) a reference standard injection timing (17.2° BTDC), an early injection timing (20.8° BTDC), and a late injection timing (12.2° BTDC); (ii) low (0.90 kW), partial (2.45 kW), and full (3.90 kW) output power load; and (iii) four fuel blends with different biodiesel (B) shares (B0, B15, B30, and B100). Experimental data were also elaborated on thanks to the response surface modelling (RSM) technique, aiming at (i) quantifying the influences of the above-listed variables and their trends on the responses, and (ii) obtaining a set of predictive numerical models that represent the basis for model-based design and optimization procedures. The results show: (i) an overall improvement of the engine performance due to the biodiesel presence in the fuel blend —in particular, B30 and B100 blends have shown peak values in both electrical (29%) and thermal efficiency (42%); (ii) the effective benefits of late SOI strategies on NOx emissions, quantified in an overall average NOx reduction of 27% for the early-to-late injection, and of 16% for the standard-to-late injection strategy. Moreover, it has emerged that the NOx-reduction capabilities of the late injection strategy decrease with higher biodiesel substitution rates; through the discussion of high-prediction-capable, parametric, data-driven models, an extensive RSM analysis has shown how the biodiesel share promotes an increase of NOx whenever it overcomes a calculated threshold that is proportional to the engine load (from about 66.5% to 85.7% of the biodiesel share).

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation and RSM Modeling of the Effects of Injection Timing on the Performance and NOx Emissions of a Micro-Cogeneration Unit Fueled with Biodiesel Blends

et al. 2022

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“…From an environmental point of view, the use of biodiesel offers benefits that make motor vehicles more sustainable and less harmful to environment [8]. However, biodiesel is more susceptible to degradation and consequently has a shorter shelf life compared to petroleum diesel [9], [10]. Therefore, there is a big demand for mechanisms that increase the biodiesel and diesel/biodiesel blends stability, for a better cost-benefit, which includes antioxidant and antibacterial additives development for diesel and biodiesel blends [11].…”

Section: Introductionmentioning

confidence: 99%

Aplicação de Chalconas e Análogos com Aditivos Antioxidantes em Misturas de Diesel e Biodiesel

Faria¹,

Oliveira²,

Duarte³

et al. 2022

Blucher Engineering Proceedings

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The fossil fuels are precursors of a large share of pollutants gas emissions into atmosphere. Thus, there is a growing demand for renewable and less polluting energy sources. The biodiesel represents a promising alternative for Brazilian and global energy matrices diversification as well as for reducing the environmental impacts of internal combustion engines. However, the biodiesel using can generate some technical problems associated with its lower stability and greater susceptibility to degradation in relation to petroleum diesel. As an alternative to the aforementioned problems, additives improve the physicochemical properties maintenance for biodiesel and its blends with mineral diesel, during storage and transport operations. This work includes the structural, energetic and reactional analysis associated to a chalcone molecule that presented a potential application as additive for diesel/biodiesel blends. Stability tests of S10 B20 diesel blended with C18H18O4 chalcone, during storage for 140 days, indicated an increase of up 50% in the accelerated oxidation stability time by modified Rancimat test method in relation to lower concentrations of same compound, according to data extracted from literature. The GAP, calculated from HOMO and LUMO energy also indicate high reactional stability for C18H18O4, confirming its antioxidant potential and being in accordance with some information for other antioxidant compounds, recommended like fuel and oils antioxidant additives. The results also indicated antibacterial activity associated to C18H18O4 chalcone.

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“…Also the honge biodiesel blend minimise the engine emissions such as CO and PM, except NOx [10] . The composition of the biodiesel affects the fuel oxidation during combustion [11] . The biodiesel is an oxygenated fuel contains reactive radicals.…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies On Reduction of Nox Emission of Biodiesel Fuelled Engine Using A Novel Natural Additive

Natesan

Reddy²,

Ahmed

2021

Preprint

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The world’s energy demand increases because of increase in human population. The conventional fossil energy resources will be depleted and burning of these conventional fuels increases greenhouse gases and causes global warming. These problems can be overcome using renewable alternative energy resources such as biofuels. In recent years biodiesel is considered as a renewable alternative to the fossil diesel. The utilisation of biodiesel as a fuel in compression ignition engine results in lower CO, HC and Smoke emissions as the biodiesel is an oxygenated fuel. The major problem with the biodiesel is its higher NOx emission and different techniques were used to minimise NOx emission. The use of synthetic and nano-metal additives to the biodiesel may affect the environment and hence it is necessary to identify non-toxic, low cost, biodegradable, and sustainable additives to reduce the NOx emission. Hence an attempt was made to use clove oil as a natural additive for the honge oil biodiesel as it has better antioxidant property. The engine tests were conducted with various dosages of clove oil such as 1000 and 2000 ppm and the engine load were increased with an increment of 25% up to full load. The addition of clove oil to the honge oil biodiesel significantly affects the engine NOx and clove oil can be substituted as an additive to reduce the NOx emission of the biodiesel fuelled CI engine and without altering the engine hardware. The clove oil enhances the oxidation stability of the honge oil biodiesel.

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Impact of different levels of biodiesel oxidation on its emission characteristics

Cited by 13 publications

References 31 publications

Experimental Investigation and RSM Modeling of the Effects of Injection Timing on the Performance and NOx Emissions of a Micro-Cogeneration Unit Fueled with Biodiesel Blends

Experimental Investigation and RSM Modeling of the Effects of Injection Timing on the Performance and NOx Emissions of a Micro-Cogeneration Unit Fueled with Biodiesel Blends

Aplicação de Chalconas e Análogos com Aditivos Antioxidantes em Misturas de Diesel e Biodiesel

Experimental Studies On Reduction of Nox Emission of Biodiesel Fuelled Engine Using A Novel Natural Additive

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