Experimental study on pollutant emissions in the novel combined porous-free flame burner

Ghorashi, Seyed Amin; Hashemi, Seyed Ali; Mollamahdi, Mahdi

doi:10.1016/j.energy.2018.08.005

Cited by 32 publications

(13 citation statements)

References 21 publications

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“…The idea of this kind of burner was developed, and some numerical and experimental studies on the diverse aspects of PFF burner were conducted. 27–30 The results indicated that in the PFF burner, the flame can be stabilized at higher inlet velocities (higher firing rate) in comparison with the porous burner. In addition, emission of CO in the PFF burner was lower than the porous burner.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the combustion characteristics in a porous-free flame burner for lean mixtures

Ghorashi

Hashemi

Mollamahdi

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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The present work implements a numerical simulation to investigate the combustion process in a porous-free flame burner. The non-equilibrium thermal condition is performed, and discretization and solving of the governing equations are conducted in a two-dimensional axisymmetric model. In order to simulate the combustion process, a reduced chemical kinetic mechanism of GRI 3.0, which includes 16 species and 41 reactions, is used. In order to prove the precision of the numerical method, some experimental tests are carried out and the numerical results are in a good agreement with the experimental measurements. The numerical results demonstrate that the porous-free flame burner has a higher flame stability compared to the conventional porous burner and the radiative efficiency of the porous-free flame burner is less than the porous burner. In addition, an increase in thermal conduction of the porous medium leads to an extension in the flame stability. In addition, the results show that with decreasing the pore density of porous medium, the flame stability is extended.

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Section: Introductionmentioning

confidence: 99%

Numerical study on the combustion characteristics in a porous-free flame burner for lean mixtures

Ghorashi

Hashemi

Mollamahdi

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…One of these methods is the use of efficient burners. In this regard, porous burner has been proposed by many researchers 1‐11 . The porous burner has several advantages compared with conventional burners, such as increasing flame stability, reducing pollutant emissions, uniform heat distribution, and preheating of unburned mixture 12 .…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of the effects of porous wall on flame stability and temperature distribution in a premixed natural gas/air combustion

2020

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In the present analysis, the flame stabilization and temperature distribution within a premixed burner contain porous wall are studied experimentally. The effects of inner diameter, length, and pore density of the porous wall, thermal load, equivalence ratio, and the inlet velocity of the fuel-air mixture on these are studied.The fuel used in this study is natural gas and the porous wall is SiC (silicon carbide) ceramic foam. The experimental results clearly indicate that the axial temperature along the porous wall increases when the inner diameter of the porous wall decreases and its length increases. The porous wall temperature with an inner diameter of 40 mm, length of 66 mm, and pore density of 30 PPI (pores per inch) has the highest temperature among the examined states. The results of studying the effect of the porous wall on flame stability show that the flame stability limit has a direct relationship with the length and pore density of porous wall and an inverse relationship with the inner diameter of the porous wall. Also, it is found that the porous wall has the highest temperature causes the maximum flame stability limit.

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“…Then, heat is transferred from the downstream to the upstream by conduction and convection mechanisms and preheating the unburned mixture of fuel–air mixture by convection heat transfer. 14–16 In some situation, the porous medium has the same effect of bluff body and improves the flame stability limits. In recent decades, the use of the porous medium has been attracted interest in improving flame stability.…”

Section: Introductionmentioning

confidence: 99%

The effects of porous wall as a novel flame stabilization method on flame characteristics in a premixed burner for CH₄/air mixture by numerical simulation

Mollamahdi

Hashemi

2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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In the present investigation, the effects of inner diameter and length of porous wall on flame stability limits, temperature distribution, methane conversion, and pressure drop in a premixed burner are numerically analyzed. The governing equations are solved by the control volume method, considering Re-Normalization Group k-ɛ for turbulence modeling and eddy dissipation concept for turbulence–chemistry interaction modeling. The simulations are performed for various porous walls with the inner diameter of 30, 40, and 50 mm and the length of 22, 44, and 66 mm. The results demonstrate that the increase in inner diameter of porous wall causes an increase in the lower flame stability limit and a decrease in the upper flame stability limit, gas and solid temperatures, pressure drop, and methane conversion. Also, the maximum solid and gas temperatures in the porous wall and methane conversion are related to the porous wall with 44 mm length. Furthermore, the methane conversion and pressure drop increase with the rise in the equivalence ratio. Finally, it can be said that the change in inner diameter of porous wall is more important than the length of porous wall in the studied phenomena.

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Experimental study on pollutant emissions in the novel combined porous-free flame burner

Cited by 32 publications

References 21 publications

Numerical study on the combustion characteristics in a porous-free flame burner for lean mixtures

Numerical study on the combustion characteristics in a porous-free flame burner for lean mixtures

Experimental analysis of the effects of porous wall on flame stability and temperature distribution in a premixed natural gas/air combustion

The effects of porous wall as a novel flame stabilization method on flame characteristics in a premixed burner for CH₄/air mixture by numerical simulation

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Experimental study on pollutant emissions in the novel combined porous-free flame burner

Cited by 32 publications

References 21 publications

Numerical study on the combustion characteristics in a porous-free flame burner for lean mixtures

Numerical study on the combustion characteristics in a porous-free flame burner for lean mixtures

Experimental analysis of the effects of porous wall on flame stability and temperature distribution in a premixed natural gas/air combustion

The effects of porous wall as a novel flame stabilization method on flame characteristics in a premixed burner for CH4/air mixture by numerical simulation

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The effects of porous wall as a novel flame stabilization method on flame characteristics in a premixed burner for CH₄/air mixture by numerical simulation