Effects of hydrogen enrichment and water vapour dilution on soot formation in laminar ethylene counterflow flames

Kalbhor, Abhijit; Oijen, J.A. van

doi:10.1016/j.ijhydene.2020.06.183

Cited by 31 publications

(3 citation statements)

References 64 publications

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“…In the diffusion flame, soot surface growth is the essential process leading to the increase of soot volume fraction in the flame (Guo et al, 2006;Kalbhor and Oijen, 2020). Temperature, C 2 H 2 , and H concentration are the main factors affecting soot surface growth.…”

Section: The Chemical Effect Of Hmentioning

confidence: 99%

“…The various effects of H 2 addition were separated by adding multiple virtual substances in the gas phase mechanism, and it was found that the chemical effect of H 2 promotes soot formation. Kalbhor and Oijen, 2020 studied the effect of adding H 2 to fuel and H 2 O to oxidant on soot formation in laminar flow counter ethylene diffusion flame through numerical simulation. The results show that H 2 on the fuel side and H 2 O on the oxidant side inhibit soot formation through a chemical effect.…”

Section: Introductionmentioning

confidence: 99%

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Effect of H2/CO addition on soot formation in ethylene diffusion flame

Zhang,

Xue,

et al. 2024

Front. Energy Res.

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Coupling the San Diego gas phase reaction mechanism and the Moss Brookes soot model using FLUENT14.0 software, the effect of adding H2/CO on the fuel side on soot formation in an ethylene/air laminar diffusion flame was studied. A specific analysis was conducted on the effects of H2, CO and its chemical effects on flame temperature, soot volume fraction, mole fractions of important intermediate products OH, H, and C2H2, as well as rate of soot mass nucleation, surface growth, and oxidation. In the numerical calculation, the virtual substances FH2 and FCO are set to separate the chemical effect of H2 and CO and to analyze the chemical effect of adding H2 and CO on soot formation. The results show that the flame temperature increases slightly, and the soot volume fraction decreases monotonically with adding H2 and CO. The chemical effect of H2 increases the temperature, the mole fraction of C2H2 and H, the soot nucleation rate, and the surface growth rate, and finally, it promotes soot formation. The chemical effect of CO increases the temperature and H mole fraction, reduces the OH mole fraction, and then increases the soot surface growth rate and reduces the soot oxidation rate. The higher soot nucleation, surface growth rate, and lower oxidation rate jointly promote soot formation.

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Section: The Chemical Effect Of Hmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of H2/CO addition on soot formation in ethylene diffusion flame

Zhang,

Xue,

et al. 2024

Front. Energy Res.

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“…One of the atmospheric polluting components of hydrocarbon fuel combustion products are soot particles, which are highly stable and, therefore, capable of long-term preservation in ambient conditions [1][2][3][4][5][6][7][8][9][10][11]. This feature, as well as the possibility of adsorption of active and carcinogenic substances on the surface of soot particles, requires the development and implementation of effective environmental measures to reduce soot particle emissions, especially in medium and low power combustion equipment [12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Water is an effective additive to fuel oil to reduce the concentration of soot in the gas phase

Sambaeva¹,

MOLDOBAEV

Kemelov

et al. 2022

MANAS Journal of Engineering

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In this paper, the fuel oil-water-air system at a wide temperature range (T=500-3000K) was studied and the ratio of gas-liquid flows (water content in fuel oil 5-15%) at the maximum entropy of the system and the formation of soot in flue gases was revealed. To reduce the concentration of soot in flue gases, a fuel oil-water emulsion was used. The particle sizes of the fuel oil-water emulsion were determined by sedimentation analysis. It is shown that they have a polydisperse character (diameter from 8.96 to 59.02 μm). The water content in fuel oil during the preparation of fuel oil-water emulsion in the boiler room was controlled by a capacitive sensor. The water flow was automatically maintained by an ejector-dosing device. The thermodynamic parameters of the system (entropy, enthalpy, internal energy) were calculated and their comparative characteristics were obtained. The concentration distribution of hydrogen, carbon, nitrogen, sulfur and oxygen containing molecules, particles and condensed phases in the gas phase has been established. During the combustion of the fuel oil-water emulsion, the concentration of soot in the gas phase decreased due to an increase in hydrogen-containing particles in the gas phase, i.e. an increase in the H/C ratio, as well as a change in the concentration of condensed carbon (mol/kg): (fuel oil without water C(c) = 63.3 mol/kg); fuel oil with water: 5% H2O, C(c) = 54.96; 10% H2O, C(c) = 50.45; 15% H2O, C(c) = 46.3. It is noted that the H/C ratio in the case of burning fuel oil -water emulsion is 2.26 times higher. A technological scheme for the preparation and combustion of fuel oil in the form of fuel oil-water emulsions in industrial boilers of the E-1/9-M(3) type of the Bridge Construction Detachment of the Kyrgyz Railway, Bishkek, has been developed. It has been established that when burning fuel oil-water emulsions in boiler units, the soot content in flue gases is reduced by 75% due to the developed contact surface of the interacting phases and more complete combustion of particles of fuel oil-water emulsions.

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An assessment of the sectional soot model and FGM tabulated chemistry coupling in laminar flame simulations

Kalbhor

Oijen

2021

Combustion and Flame

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Effects of hydrogen enrichment and water vapour dilution on soot formation in laminar ethylene counterflow flames

Cited by 31 publications

References 64 publications

Effect of H2/CO addition on soot formation in ethylene diffusion flame

Effect of H2/CO addition on soot formation in ethylene diffusion flame

Water is an effective additive to fuel oil to reduce the concentration of soot in the gas phase

An assessment of the sectional soot model and FGM tabulated chemistry coupling in laminar flame simulations

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