The combustion of droplets of high-asphaltene heavy oils

Bartle, Keith D.; Jones, James C. Peyton; Lea‐Langton, Amanda; Pourkashanian, Mohamed; Ross, Andrew B.; Thillaimuthu, J.S.; Waller, Peter; Williams, Alan

doi:10.1016/j.fuel.2012.07.004

Cited by 22 publications

(42 citation statements)

References 34 publications

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“…Increasing the viscosity of the fuel increases both the sizes of droplets and the resulting cenospheres. This is not surprising considering the formulations of the droplet breakup models and is also consistent with experimental findings in literature [29]. As the viscosity of the droplets influences atomization, and consequently cenosphere emissions, taking viscosity into account in a reasonable way is important in the present context.…”

Section: A Well Working Atomization Model Is Important For Accurate Rsupporting

confidence: 90%

“…Their hypothesis was that this was due to better burnout of carbon due to better availability of oxygen at high loads [28]. Bartle et al found that the size distribution of emitted cenospheres seems to depend on the size distribution of droplets in the fuel spray [29]. This supports the fact that each droplet forms an cenosphere.…”

Section: Resultsmentioning

confidence: 96%

“…This supports the fact that each droplet forms an cenosphere. They also found that the asphaltene content of the fuel influenced both the sizes of the droplets and the resulting cenospheres due to its influence on the viscosity of the fuel [29]. Villasenor et al studied the effects of asphaltenes on HFO droplet combustion and found that while coke formation is not only dependent on asphaltene content of the fuel, high asphaltene content increases the burnout time for created cenospheres [30].…”

Section: Resultsmentioning

confidence: 99%

“…The assumption of every droplet forming a cenosphere is supported by the findings of Bomo et al [4] and could thus be concidered reasonable. Bartle et al [29] also reported a strong similarity between droplet size distributions in the fuel spray and resulting cenosphere emissions. The finding that influencing droplet size distributions influences cenosphere sizes would indicate that emissions of cenospheres could conceivably be influenced by modifying spray atomization.…”

Section: A Well Working Atomization Model Is Important For Accurate Rmentioning

confidence: 88%

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A New Approach for Modeling Coke Particle Emissions from Large Diesel Engines Using Heavy Fuel Oil

Hentelä

Kaario

Garaniya

et al. 2017

SAE Technical Paper Series

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In the present study, a new approach for modelling emissions of coke particles or cenospheres from large diesel engines using HFO (Heavy fuel oil) was studied. The model used is based on a multicomponent droplet mass transfer and properties model that uses a continuous thermodynamics approach to model the complex composition of the HFO fuel and the resulting evaporation behavior of the fuel droplets. Cenospheres are modelled as the residue left in the fuel droplets towards the end of the simulation. The mass-transfer and fuel properties models were implemented into a cylinder section model based on the Wärtsilä W20 engine in the CFD-code Star CD v.4.24. Different submodels and corresponding parameters were tuned to match experimental data of cylinder pressures available from Wärtsilä for the studied cases. The results obtained from the present model were compared to experimental results found in the literature. The performance of the model was found to be promising although conclusive validation of the model would require more detailed experimental results about cenosphere emissions from the specific case studied here. According to the results obtained from this model the emissions of cenospheres are a function of both operating conditions and fuel properties. While the droplet evaporation and properties models were used in this study to model cenosphere emissions, the approach could also be used to study the combustion behavior of HFO in a broader sense.

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Section: A Well Working Atomization Model Is Important For Accurate Rsupporting

confidence: 90%

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: A Well Working Atomization Model Is Important For Accurate Rmentioning

confidence: 88%

See 2 more Smart Citations

A New Approach for Modeling Coke Particle Emissions from Large Diesel Engines Using Heavy Fuel Oil

Hentelä

Kaario

Garaniya

et al. 2017

SAE Technical Paper Series

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“…The asphaltenes content is 8.2 wt %, while previous studies showed asphaltenes contents ranging from 2.6 to 12.12 wt % . 37 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 10 steep descent line corresponding to a rapid mass loss is observed in the TG curve. In the LTO region, the side chains of heavy compounds are split and subject to low-temperature oxidation.…”

Section: Ft-icr Massmentioning

confidence: 98%

TG/DTG, FT-ICR Mass Spectrometry, and NMR Spectroscopy Study of Heavy Fuel Oil

Elbaz

Gani²,

Hourani³

et al. 2015

Energy Fuels

103

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ABSTRACT:There is an increasing interest in comprehensive study of heavy fuel oil (HFO) due to its growing use in furnaces, boilers, marines, and recently in gas turbines. In this work, the thermal combustion characteristics and chemical composition of HFO were investigated using a range of techniques. Thermogravimetric analysis (TGA) was conducted to study the non-isothermal HFO combustion behavior. Chemical characterization of HFO was accomplished using various standard methods in addition to direct infusion atmospheric pressure chemical ionization Fourier transform ion cyclotron resonance mass spectrometry (APCI-FTICR MS), high resolution 1 H nuclear magnetic resonance (NMR), 13 C NMR, and two dimensional hetero-nuclear multiple bond correlation (HMBC) spectroscopy. By analyzing thermogravimetry and differential thermogravimetry (TG/DTG) results, three different reaction regions were identified in the combustion of HFO with air, specifically, low temperature oxidation region (LTO), fuel deposition (FD) and high temperature oxidation (HTO) region. At the high end of the LTO region, a mass transfer resistance (skin effect) was evident. Kinetic analysis in LTO and HT|O regions was conducted using two different kinetic models to calculate the apparent activation energy. In both models, HTO activation energies are higher than those for LTO. The FT-ICR MS technique resolved thousands of aromatic and sulfur containing compounds in the HFO sample and provided compositional details for individual molecules of three major class species. The major classes of compounds included species with one sulfur atom (S 1 ), with two sulfur atoms 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 (S 2 ), and purely hydrocarbons (HC). The DBE (double bond equivalent) abundance plots established for S 1 and HC provided additional information on their distributions in the HFO sample. The 1 H NMR and 13 C NMR results revealed that nearly 59% of the 1 H nuclei were distributed as paraffinic CH 2 and 5% were in aromatic groups. Nearly 21% of 13 C nuclei were distributed in aromatic groups indicating that most paraffinic CH 2 groups are attached to aromatic rings. A negligible amount of olefins was present and an appreciable quantity of monoaromatic and poly-aromatic content were observed. Molecular connectivity between the hydrogen and carbon atoms using HMBC spectra was utilized to propose several plausible skeletal structures in HFO.

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