The effect of elevated reactant temperatures on soot nanostructures in a coflow diffusion ethylene flame

Chu, Carson; Naseri, Ali; Mitra, Tirthankar; Dadsetan, Mehran; Sediako, Anton D.; Thomson, Murray J.

doi:10.1016/j.proci.2020.06.348

Cited by 21 publications

(4 citation statements)

References 56 publications

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“…The D1 band, located at 1350cm -1 , was attributed to the A1g modes of crystalline graphite, which was attributed to the disordered graphitic structure such as defects or heteroatoms [45]. The D2 band (1610cm -1 ), D3 band (1550cm -1 ), and D4 band (1180cm -1 ) were typical for graphene surface defects, amorphous carbon compounds, and mixed hybridization carbon structures respectively [46]. STEM characterization was performed on a ThermoFisher Themis Z microscope equipped with two aberration correctors under 300 kV.…”

Section: Characterizationmentioning

confidence: 99%

“…The maturity increase of soot samples leads to the increase of the average graphitization degree of the samples, which in turn affects the oxidation reactivity. The value of ID1/IG was related to the length of the aromatic layer in soot [46]. Studies [71][72][73] have reported that there is a linear relationship between ID1/IG and fringe length La.…”

Section: Relationship Between Oxidation Model and Soot Propertiesmentioning

confidence: 99%

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Non-catalytic oxidation mechanism of industrial soot at high temperature

Wang

Gao

Jiang

et al. 2023

Preprint

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The elimination of soot is particularly crucial in the pursuit of reducing pollutant emissions and achieving a circular economy. The generation of soot is a significant challenge in industries. The most effective approach to eliminate soot is to oxidize it in the high-temperature furnace. In this study, soot with different properties was produced the by non-catalytic partial oxidation process at high temperatures. The real-time oxidation processes of soot nanoparticles at 900°C were studied by in situ transmission electron microscopy (TEM). The industrial soot performs various oxidation models. The corresponding mathematical expressions of different oxidation models were developed. The incipient soot of shrinking core model (SCM) has a faster reaction rate than the partially matured soot of internal oxidation model (IOM) and the mature soot of SCM. A rare core-shell separation model (CSM) was studied. The nanostructures of soot in different oxidation models were characterized, and the relationship between macroscopic properties and nanostructures was established by Raman results and lattice fringe analysis, effective in the prediction of soot oxidation behavior.

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Section: Characterizationmentioning

confidence: 99%

Section: Relationship Between Oxidation Model and Soot Propertiesmentioning

confidence: 99%

Non-catalytic oxidation mechanism of industrial soot at high temperature

Wang

Gao

Jiang

et al. 2023

Preprint

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“…Several studies are available to investigate the influence of combustor pressure and reactant temperature on soot formation, although mostly for laminar flames [1][2][3][4][5][6][7][8]. Mishra and Kumar [1] investigated the effect of preheated oxidizer (air) temperature in laminar LPG+H2/air diffusion flame.…”

Section: Introductionmentioning

confidence: 99%

“…However, no information on soot formation was reported with an increase in air temperature. Chu et al [4] evaluated the relationship between the soot surface growth, soot nanostructure, and air temperature in a co-flow ethylene/air diffusion flame using multiple experimental techniques. A recent investigation by Qi et al [5] on the influence of gas preheat temperature in a series of methane, ethylene, and nitrogen diluted ethylene co-flow diffusion flame suggested that both the soot formation and soot oxidation were increased with an increase in gas preheat temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Preheated Oxidizer Temperature on Soot Formation and Flame Structure in Turbulent Methane-Air Diffusion Flames at 1 and 3 atm: A CFD Investigation

et al. 2021

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This article presents the results of computations on pilot-based turbulent methane/air co-flow diffusion flames under the influence of the preheated oxidizer temperature ranging from 293 to 723 K at two operating pressures of 1 and 3 atm. The focus is on investigating the soot formation and flame structure under the influence of both the preheated air and combustor pressure. The computations were conducted in a 2D axisymmetric computational domain by solving the Favre averaged governing equation using the finite volume-based CFD code Ansys Fluent 19.2. A steady laminar flamelet model in combination with GRI Mech 3.0 was considered for combustion modeling. A semi-empirical acetylene-based soot model proposed by Brookes and Moss was adopted to predict soot. A careful validation was initially carried out with the measurements by Brookes and Moss at 1 and 3 atm with the temperature of both fuel and air at 290 K before carrying out further simulation using preheated air. The results by the present computation demonstrated that the flame peak temperature increased with air temperature for both 1 and 3 atm, while it reduced with pressure elevation. The OH mole fraction, signifying reaction rate, increased with a rise in the oxidizer temperature at the two operating pressures of 1 and 3 atm. However, a reduced value of OH mole fraction was observed at 3 atm when compared with 1 atm. The soot volume fraction increased with air temperature as well as pressure. The reaction rate by soot surface growth, soot mass-nucleation, and soot-oxidation rate increased with an increase in both air temperature and pressure. Finally, the fuel consumption rate showed a decreasing trend with air temperature and an increasing trend with pressure elevation.

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