Study of pollutant emissions and dynamics of non-premixed turbulent oxygen enriched flames from a swirl burner

Boushaki, Toufik; Merlo, Nazim; Chauveau, Christian; Gökalp, İskender

doi:10.1016/j.proci.2016.06.046

Cited by 24 publications

(13 citation statements)

References 19 publications

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“…Boushaki et al investigated the effect of the added O 2 on the generation of CO, NO x , and CO 2 . 13 The results show that oxygen enrichment is favorable for the increase of CO 2 and NO x and the decrease of CO emissions. Alabaş B et al 14 found that the oxygen enrichment of air reduces the CO and increases the NO generation for the H 2 /CO/CH 4 mixture in a swirl burner.…”

Section: Introductionmentioning

confidence: 91%

Experimental Study of the Laminar Flame Speeds of the CH₄/H₂/CO/CO₂/N₂ Mixture and Kinetic Simulation in Oxygen-Enriched Air Condition

Bai

et al. 2020

ACS Omega

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The experimental study on the laminar flame speeds of the CH4/H2/CO/CO2/N2 mixture was carried out in oxygen-enriched air condition. The laminar flame propagation velocities of the blended gas were measured in a range of equivalence ratios (from 0.6 to 1.4) and oxygen concentrations (from 21 to 33%) using a Bunsen flame. Comparisons between the experiments and calculations show that the GRI Mech 3.0 mechanism can well predict the laminar flame speed of the blended gas in oxygen-enriched conditions. The laminar flame propagation velocities were enhanced by the increasing oxygen concentration, while the reaction pathway of fuel changed little. The effects of each species of the CH4/H2/CO/CO2/N2 mixture on the laminar flame speeds were discussed. Results show that the laminar flame speed is promoted by the increase of H2 and CO, while the laminar flame speed is decreased by the increasing CH4, CO2, and N2 concentrations. The inhibition effect of CO2 on the laminar flame speed is bigger than that of N2, which is due to the difference in the properties of CO2 and N2.

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Section: Introductionmentioning

confidence: 91%

Experimental Study of the Laminar Flame Speeds of the CH₄/H₂/CO/CO₂/N₂ Mixture and Kinetic Simulation in Oxygen-Enriched Air Condition

Bai

et al. 2020

ACS Omega

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“…Their study was interested to identify the presence of vortex breakdown, the central recirculation zone (CRZ) and the precessing vortex core (PVC). Boushaki et al [13] investigated turbulent flames on a swirl burner with a radial injection of fuel (Figure 2). The burner consists of two concentric tubes with a swirler placed in an annular part supplying the air.…”

Section: Swirl Effects On Flamesmentioning

confidence: 99%

“…Boushaki et al [13] and Nazim et al [41] reported the effect of the swirl number on the NOx and CO emissions. They found that in the case of a swirl number of 1.4, the EICO rate is slightly lower than in the case of a swirl number of 0.8.…”

Section: Swirling Flows and Flamesmentioning

confidence: 99%

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Introductory Chapter: Swirling Flows and Flames

Boushaki¹

2019

Swirling Flows and Flames

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Swirling flows are used in a very wide range of industrial applications. In non-reacting cases, examples of applications include vortex amplifiers and reactors, heat exchangers, jet pumps, cyclone separators, whirlpools, tornadoes, etc. In reacting cases, swirlers are widely used in combustion systems, such as gas turbines, industrial furnaces, boilers, gasoline and diesel engines and many other practical heating devices. Effects of using swirl on flow and combustion are significant and various and concern, for example, aerodynamics, mixing, flame stability, intensity of combustion and pollutant emissions. In this chapter, we are interested in the use of swirling flows in combustion systems. In industrial plants, the geometric methods of flame stabilization are based on increasing the residence time of reactive gases either by the wake effect bluff-body burner, by the flow rotation of reactants swirl burner or by a combination of these two mechanisms. Burners with helical flows generally referred to as the swirl burner have very wide applications in the industrial field. In the literature, many examples of uses of swirling jets are found as a means of controlling combustion [1-4]. Other studies focused on the swirl effect on the characteristics of lifted flames [5], stabilization and blow-out phenomenon [6-8] and pollutant emissions [9-13]. 2. Swirl generation techniques There are several ways to generate the rotation of a flow. They can be classified into three main categories:

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“…Various parameters affect the IRZ flow structure, which include the swirl number, burner geometry, equivalence ratio, and mixture composition. These parameters have been investigated by several researchers [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effect of the wall thermal boundary condition on the structure of a confined swirling diffusion flame

Ahdy

Boraey

Hameed

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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The present study focuses on the effect of the wall heat loss on a confined swirling diffusion flame. The objective is to assess the effect of changing the wall thermal boundary condition (i.e., from isothermal to adiabatic) on the flow structure, the flame shape, and the mixing behavior. Reynolds-averaged Navier-Stokes equations are solved. The diffusion flamelet model is employed in the simulation. The comparison of the numerical and experimental axial wall heat flux distributions shows a good agreement. The inner recirculation zone (IRZ) is shorter in the case of the adiabatic wall. It features higher negative axial velocities. The radial gradient of the axial velocity is higher which could enhance mixing and flame stability. The outer recirculation zone (ORZ) size does not change with the wall thermal boundary condition. Generally, the exit flow from the furnace decelerates due to the formation of the IRZ. This effect is more pronounced when the IRZ is longer, as the case when there is a wall heat loss. The flame is longer in the adiabatic wall case. However, its position relative to the burner exit does not change compared to the isothermal wall. In both cases, the flame is stabilized on the boundary of the IRZ. The mixing behavior is similar for the two wall thermal boundary conditions. However, the adiabatic wall case features a more fuel-rich mixture in the flame stabilization region, mainly due to the different velocity fields. Pockets of very fuel-rich mixtures are formed in the ORZ.

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Study of pollutant emissions and dynamics of non-premixed turbulent oxygen enriched flames from a swirl burner

Cited by 24 publications

References 19 publications

Experimental Study of the Laminar Flame Speeds of the CH₄/H₂/CO/CO₂/N₂ Mixture and Kinetic Simulation in Oxygen-Enriched Air Condition

Experimental Study of the Laminar Flame Speeds of the CH₄/H₂/CO/CO₂/N₂ Mixture and Kinetic Simulation in Oxygen-Enriched Air Condition

Introductory Chapter: Swirling Flows and Flames

Effect of the wall thermal boundary condition on the structure of a confined swirling diffusion flame

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Study of pollutant emissions and dynamics of non-premixed turbulent oxygen enriched flames from a swirl burner

Cited by 24 publications

References 19 publications

Experimental Study of the Laminar Flame Speeds of the CH4/H2/CO/CO2/N2 Mixture and Kinetic Simulation in Oxygen-Enriched Air Condition

Experimental Study of the Laminar Flame Speeds of the CH4/H2/CO/CO2/N2 Mixture and Kinetic Simulation in Oxygen-Enriched Air Condition

Introductory Chapter: Swirling Flows and Flames

Effect of the wall thermal boundary condition on the structure of a confined swirling diffusion flame

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Product

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Experimental Study of the Laminar Flame Speeds of the CH₄/H₂/CO/CO₂/N₂ Mixture and Kinetic Simulation in Oxygen-Enriched Air Condition

Experimental Study of the Laminar Flame Speeds of the CH₄/H₂/CO/CO₂/N₂ Mixture and Kinetic Simulation in Oxygen-Enriched Air Condition