Influence of Asphaltene Concentration on the Combustion of a Heavy Fuel Oil Droplet

Khateeb, Abdulrahman A.; Elbaz, Ayman M.; Guida, Paolo; Roberts, William L.

doi:10.1021/acs.energyfuels.8b03260

Cited by 32 publications

(28 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This result is not answered by either the smaller SMD, shown in Tables 4 and 5, or the slightly slower evaporation of R [36]. Hence, this is a probable root cause of the crust formation on the larger droplets, already observed for HFO [34,35]. The emissions of BL-R, BL-D, and Q15-D cases, shown in Figure 9, are shown in Figure 11.…”

Section: Pollutant Emissionmentioning

confidence: 90%

“…The evaporation of heavy fuels is still less known, since the outer surface of the droplet might solidify even for kerosene gel [33]. Significant crust formation was similarly observed for HFO [34], featuring pores on the surface [35] where the oil inside left the droplet when evaporated. To overcome this issue, atomization with steam [30] might help, substituting air with an H 2 O atmosphere in the vicinity of the fuel nozzle.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Comparison of Diesel and Crude Rapeseed Oil Combustion in a Swirl Burner

Józsa

2020

Applied Sciences

View full text Add to dashboard Cite

In pursuing maximum energy efficiency, local utilization of various crude fuels came into view. The present paper compares the combustion characteristics of standard diesel oil and crude rapeseed oil; the latter is an excellent model for high-viscosity liquid fuels. The combustion tests were performed in a 15 kW atmospheric turbulent swirl burner; the liquid fuels were atomized by a plain-jet airblast atomizer. Firstly, the acoustic signal is evaluated, since the instabilities of swirl combustion are accompanied by characteristic pressure fluctuations. The spectral analysis was performed by Wavelet transform, which fits excellently to the acoustic spectrum of combustion noise. This multi-scale technique features increased spectral resolution at lower frequencies at the expense of lower temporal resolution, providing excellent performance at both low-frequency, well-localized components and high-frequency, broadband phenomena. The joint probability density function of two characteristic frequencies was plotted with the result that flame acoustics match for the two fuels. Secondly, their pollutant emissions were compared and evaluated under similar conditions with the conclusion that crude rapeseed oil can substitute diesel oil in a limited operating range. Note that the distinct material properties already mean differences in all atomization, evaporation, and mixing characteristics, hence, the latter result is not intuitive.

show abstract

Section: Pollutant Emissionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Experimental Comparison of Diesel and Crude Rapeseed Oil Combustion in a Swirl Burner

Józsa

2020

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Further downstream, the temperature again shows a gradual increase. Recently, the TGA analysis on the same HFO sample provided the information that the fuel evaporation occurred in two consecutive steps, where the low boiling gases left out the fuel, while the second phase of the devolatilization occurs at higher temperature [41]. This explained the first flame peak temperature located close to the fuel spray nozzle, which is associated with the first phase of evaporation.…”

Section: Accepted Manuscript N O T C O P Y E D I T E Dmentioning

confidence: 99%

Heavy Fuel Oil Combustion Characteristics Evaluation in Various Swirling Flow Conditions

Pei

Elhagrasy

Jiang

et al. 2021

Journal of Engineering for Gas Turbines and Power

Self Cite

View full text Add to dashboard Cite

Heavy fuel oil (HFO) is an economical fuel alternative for power generation as its low production cost and high energy density. However, its incomplete combustion induced by the presence of long-chain petroleum molecules in the fuel results in high levels of emissions. Here, we investigate the influence of the swirl flow on the combustion and emissions of a spray HFO swirling flame. To this end, HFO is sprayed into a hot swirling air, using an air-blast nozzle. The flame blowout limits are tested under different swirl flows. An investigation of the in-flame temperature fields, gaseous emissions including CO, CO2, O2, NOX, SOX, UHC (Unburned Hydrocarbon) and solid particles in the form of cenospheres are used to quantify the performance of the HFO combustion. The influence of the HFO swirling flame is tested under different conditions of global equivalence ratio, swirling number, and tangential and axial airflow rates. A comparison of two different flame regimes that fuel-jet dominate flame and air-driven vortex flows are investigated and compared in various swirling flow conditions. The results show that the tangent air is the primary factor for preheating and evaporating the fuel, thus defining the flame operating regimes.

show abstract

“…Fundamental research on HFO combustion reported in the literature has mostly been carried out using suspended [21][22][23][24][25] and falling droplet [25][26][27][28] techniques, beside numerical modeling [29][30][31][32][33][34][35]. These droplet experiments are unable to reproduce the spray properties seen in combustors, whereas large scale industrial furnaces on the other hand lack the experimental accuracy such that meaningful interpretation of the combustion processes can be made.…”

Section: Accepted Manuscript N O T C O P Y E D I T E Dmentioning

confidence: 99%

“…In the present work, spray combustion of HFO was carried out using a high swirl, turbulent jet flame by using a novel burner design. Due to the high residual content, HFO has a significant quantity of asphaltenes and resins that make it difficult to burn [9,21,42] and this requires longer residence times and higher temperatures for better combustion. The high swirl, turbulent jet flame produced by the burner results in a stabilized flame that can efficiently burn HFO by providing a long residence time and good mixing between fuel and air.…”

Section: Accepted Manuscript N O T C O P Y E D I T E Dmentioning

confidence: 99%

Swirling Flame Combustion of Heavy Fuel Oil: Effect of Fuel Sulfur Content

Pei

Jameel

Chen

et al. 2020

Journal of Energy Resources Technology

Self Cite

View full text Add to dashboard Cite

In the present work, an experimental investigation on the effect of sulfur content in heavy fuel oil (HFO) on the gaseous emissions under swirling flame conditions was carried out. The sulfur content in HFO was varied by blending with ultra-low sulfur diesel and four fuel samples containing 3.15, 2.80, 1.97 and 0.52 % sulfur (by mass) were prepared. The fuels were then fired in a high-swirl stabilized, turbulent spray flame. The combustion performance of the fuels was evaluated by measuring flame temperature distribution, gaseous emissions (SOx, NOx, CO, CO2, and flue gas pH) and particulate matter (PM) emissions (morphology, composition, and pH). The results showed a significant reduction in the SO2 emissions and acidity of the flue gas when the sulfur content in the fuel was reduced, as expected. Flue gas SO2 concentration reduced from 620 ppm to 48 ppm when the sulfur content in the fuel was reduced from 3.15 to 0.52 % (by mass). Sulfur balance calculations indicate that nearly 97.5% of the sulfur in the fuel translates into gaseous emissions and the remaining 2.5% appears in PM emissions. Ninety-five percent of gaseous sulfur emissions are SO2, whereas the rest appears as SO3. Varying the sulfur content in the fuel did not have a major impact on the flame temperature distribution or NOx emissions. The morphologies and size distribution of the PM did not change significantly with sulfur content as asphaltenes content of the fuels remained the same.

show abstract

Influence of Asphaltene Concentration on the Combustion of a Heavy Fuel Oil Droplet

Cited by 32 publications

References 44 publications

Experimental Comparison of Diesel and Crude Rapeseed Oil Combustion in a Swirl Burner

Experimental Comparison of Diesel and Crude Rapeseed Oil Combustion in a Swirl Burner

Heavy Fuel Oil Combustion Characteristics Evaluation in Various Swirling Flow Conditions

Swirling Flame Combustion of Heavy Fuel Oil: Effect of Fuel Sulfur Content

Contact Info

Product

Resources

About