Numerical investigation of turbulent combustion with hybrid enrichment by hydrogen and oxygen

Riahi, Z.; Hraiech, Ibtissem; Sautet, Jean-Charles; Nasrallah, Sassi Ben

doi:10.1016/j.ijhydene.2019.11.151

Cited by 6 publications

(3 citation statements)

References 34 publications

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“…Costa Rocha (2014) calibrated a model for a small-scale horizontal axis wind turbine. In contrast, Riahi et al (2020) stated in their paper the use of the SST k-ω for a turbulent combustion with hybrid enrichment by hydrogen and oxygen. In their work, a turbulent diffusion flame from a coaxial burner is analyzed by investigating the impact of hydrogen amount variation on the flame structure, on the temperature distribution and on the emissions of atmospheric pollutants.…”

Section: Introductionmentioning

confidence: 98%

Flame temperature analysis in the oxycut process using acetylene gas: a numerical study

et al. 2020

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To cut metals, the oxycut process uses a preheating flame, usually composed of oxygen and a combustible gas, in addition to a flame-independent jet of oxygen. In the present work, the partially premixed combustion model of a finite volume-based software was applied to analyze the flame temperature in a cutting tip of acetylene. At the torch inlet boundary, the flow rates of oxygen and acetylene were adjusted to sweep a wide range of fuel-oxygen ratio. The results pointed a peak surrounding the stoichiometric ratio, at 3106 °C for the literature and 2650.93 °C for the numerical model, contrasting a deviation of 14.65%. The maximum temperature occurs at 52.38% of oxygen volume for the literature and 50.03% for the model, a difference of 2.35 percentage points only. It is concluded that the results of the numerical approach attained the ends of the research.

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Section: Introductionmentioning

confidence: 98%

Flame temperature analysis in the oxycut process using acetylene gas: a numerical study

et al. 2020

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“…The results obtained show that hydrogen addition to natural gas improves the mixing between the reactants, reduces their residence time, and reduces the length and thickness of the flame. On the other hand, the hydrogen enrichment minimizes the CO 2 and CO production and increases the NO x level …”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the hydrogen enrichment minimizes the CO 2 and CO production and increases the NO x level. 11 Recently, Pio et al studied the safety parameters for O 2enriched flames. The heat flux burner was adopted for measuring the laminar burning velocity of methane in O 2enriched air at different equivalence ratios.…”

Section: Introductionmentioning

confidence: 99%

Combustion Using Oxygen-Lancing in a Reheating Furnace

2021

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Fuel economy has been a primary issue in the steel industry because it uses large amounts of energy, such as the gaseous fuel of byproduct gas. Furthermore, reheating throughput capacity has been a key issue because it can improve furnace efficiency, leading to fuel economy. Many attempts have tried improving fuel economy using oxygen in a reheating furnace. Oxygen-lancing technology was developed to increase fuel economy and maintain the same level of NO x concentration simultaneously. Mechanisms that inject oxygen into flames locally causing flame quenching and at the same time suppressing the increase in NO x concentration due to recirculation of reheating furnace-burned gases are key to this study. Various oxygen concentrations for its lancing were used to investigate its effects on furnace temperature and NO x concentration in a test furnace. It was determined that 30% of oxygen was optimal regarding fuel economy and NO x concentrations. Oxygen was injected into the flame using two lancing pipes at 11° in a design capacity of 125 MW. The results showed a 3–5% increase in fuel economy and the same level of NO x concentration in the furnace.

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Effects of hydrogen-enriched methane combustion on latent heat recovery potential and environmental impact of condensing boilers

Bălănescu

Homutescu

2021

Applied Thermal Engineering

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Numerical investigation of turbulent combustion with hybrid enrichment by hydrogen and oxygen

Cited by 6 publications

References 34 publications

Flame temperature analysis in the oxycut process using acetylene gas: a numerical study

Flame temperature analysis in the oxycut process using acetylene gas: a numerical study

Combustion Using Oxygen-Lancing in a Reheating Furnace

Effects of hydrogen-enriched methane combustion on latent heat recovery potential and environmental impact of condensing boilers

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