Effects of inclined jets on turbulent oxy-flame characteristics in a triple jet burner

Boushaki, Toufik; Mergheni, Mohamed Ali; Sautet, Jean-Charles; Labegorre, Bernard

doi:10.1016/j.expthermflusci.2007.11.009

Cited by 27 publications

(9 citation statements)

References 13 publications

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“…As is well known, the production of NO x can be dramatically reduced through staging combustion technology, even without flue gas recirculation (Boushaki et al, 2008;. Much more NO x reduction can be achieved by staging compared with the air-fuel combustion process (Cao et al, 2010;Watanabe et al, 2011).…”

Section: Introductionmentioning

confidence: 87%

Effect of dilution of fuel in CO2 on the conversion of NH3 to NO x during oxy-fuel combustion

Qiu

Yang

You

et al. 2015

J. Zhejiang Univ. Sci. A

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Abstract:The indirect chemical effects of fuel dilution by CO 2 on NO formation were investigated numerically in this paper. CH 4 doped with NH 3 was used as fuel, while CO 2 and O 2 were mixed as oxidant. The dilution effect of CO 2 was then investigated through adding extra CO 2 to the reaction system. An isothermal plug flow reactor was used. An unbranched chain reaction mechanism is proposed to illustrate the chemical effects of CO 2 on the H/O/OH radical pool and NO x . Due to the reaction between CO 2 and H, extra NO will be formed in fuel-rich conditions, while NO will be inhibited in fuel-lean conditions and high CO 2 dilution conditions. The reaction affected the radical pools of OH, H, and O of the branched chain reaction, and then the formation and reduction of NO. The pool of H had the greatest effect on NO reduction. The results suggest that the indirect chemical effects on NO formation differ between diluted fuel oxy-fuel combustion conditions and normal oxy-fuel conditions.

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Section: Introductionmentioning

confidence: 87%

Effect of dilution of fuel in CO2 on the conversion of NH3 to NO x during oxy-fuel combustion

Qiu

Yang

You

et al. 2015

J. Zhejiang Univ. Sci. A

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“…A new generation of highly separated fuel and oxidant injection burners is of great interest to industrialists. The idea of this burner consists of separating combustible and oxidant to dilute the reactants with combustion products before the mixing of the reactants [2,4,9].…”

Section: Introductionmentioning

confidence: 99%

A New Combustion Method in a Burner with Three Separate Jets

Mergheni¹,

Belhajbrahim²,

Boushaki³

et al. 2020

Numerical and Experimental Studies on Combustion Engines and Vehicles

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Oxy-flames from burners with separated jets present attractive perspectives because the separation of reactants generates a better thermal efficiency and reduction of pollutant emissions. The principal idea is to confine the fuel jet by oxygen jets to favor the mixing in order to improve the flame stability. This chapter concerns the effect of equivalence ratio on characteristics of a non-premixed oxy-methane flame from a burner with separated jets. The burner of 25 kW power is composed with three aligned jets, one central methane jet surrounded by two oxygen jets. The numerical simulation is carried out using Reynolds Average Navier-Stokes (RANS) technique with k-ε as a turbulence closure model. The eddy dissipation model is applied to take into account the turbulence-reaction interactions. The study is performed with different global equivalence ratios (0.7, 0.8 and 1). The validation of the numerical tools is done by comparison with experimental data of the stoichiometric regime (Ф = 1). The two lean regimes of Ф = 0.7 and 0.8 are investigated only by calculations. The velocity fields with different equivalence ratio are presented. It yields to increase of longitudinal and transverse velocity, promotes the fluctuation in interaction zone between fuel and oxygen also a better mixing quality and a decrease of the size of the recirculation zone.

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“…Several researches documented the flame control using the inclined oxygen jets [24]. This notion improves the premixed fuel-oxidants and thus lowers the NOx emissions.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Effect of Air Velocity in Turbulent Non-Premixed Flames

Namazian

Hashemi

Namazian

2016

Archive of Mechanical Engineering

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In this study, the turbulent non-premixed methane-air flame is simulated to determine the effect of air velocity on the length of flame, temperature distribution and mole fraction of species. The computational fluid dynamics (CFD) technique is used to perform this simulation. To solve the turbulence flow, k-ε model is used. In contrast to the previous works, in this study, in each one of simulations the properties of materials are taken variable and then the results are compared. The results show that at a certain flow rate of fuel, by increasing the air velocity, similar to when the properties are constant, the width of the flame becomes thinner and the maximum temperature is higher; the penetration of oxygen into the fuel as well as fuel consumption is also increased. It is noteworthy that most of the pollutants produced are NOx, which are strongly temperature dependent. The amount of these pollutants rises when the temperature is increased. As a solution, decreasing the air velocity can decrease the amount of these pollutants. Finally, comparing the result of this study and the other work, which considers constant properties, shows that the variable properties assumption leads to obtaining more exact solution but the trends of both results are similar.

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Effects of inclined jets on turbulent oxy-flame characteristics in a triple jet burner

Cited by 27 publications

References 13 publications

Effect of dilution of fuel in CO2 on the conversion of NH3 to NO x during oxy-fuel combustion

Effect of dilution of fuel in CO2 on the conversion of NH3 to NO x during oxy-fuel combustion

A New Combustion Method in a Burner with Three Separate Jets

Investigation on Effect of Air Velocity in Turbulent Non-Premixed Flames

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