An Experimental Study on Submerged Flame in a Two-Layer Porous Burner

Document Type : Research Article

Authors

Department of Mechanical Engineering, University of Kashan, Kashan, Iran

Abstract

Combustion in porous media is an effective method to minimize dissipations and save energy. Therefore, Study on the porous burners has been the focus of many researches in the past decade, due to the favorable features of these burners. The conditions for the formation of a steady-state submerged flame in a ceramic (Silicon Carbide) porous medium were investigated at four firing rates. The results were obtained on a ceramic foam with a cross section area of 63.6 cm2 and pore density of either 10 or 30 ppi. The reactants were air and natural gas with various equivalence ratios. In this experimental study, eight thermocouples were mounted on the burner walls along its axis in order to track the flame position, and the results were presented as temperature profiles of the porous wall. It was observed that the formation of submerged flame depends on firing rate and equivalence ratio. The stability limit of submerged flame (the range between surface flame and flash back limits) is reduced by increasing the firing rate. Results show that, when the mixture velocity is low, the stability limit extends. Finally, the ranges of equivalence ratio and mixture velocity for the formation of submerged flame are presented at various firing rates.

Keywords

Main Subjects

References

[1] W. FJ, Combustion temperature - the future, Nature, 233 (1971) 239–241.
[2] L. Younis, R. Viskanta, Experimental determination of the volumetric heat transfer coefficient between stream of air and ceramic foam, International journal of heat and mass transfer, 36(6) (1993) 1425-1434.
[3] V. Khanna, R. Goel, J. Ellzey, Measurements of emissions and radiation for methane combustion within a porous medium burner, Combustion science and technology, 99(1-3) (1994) 133-142.
[4] J. Randrianalisoa, Y. Bréchet, D. Baillis, Materials selection for optimal design of a porous radiant burner for environmentally driven requirements, Advanced Engineering Materials, 11(12) (2009) 1049-1056.
[5] A. Bakry, A. Al-Salaymeh, H. Ala’a, A. Abu-Jrai, D. Trimis, Adiabatic premixed combustion in a gaseous fuel porous inert media under high pressure and temperature: Novel flame stabilization technique, Fuel, 90(2) (2011) 647-658.
[6] C. Keramiotis, B. Stelzner, D. Trimis, M. Founti, Porous burners for low emission combustion: An experimental investigation, Energy, 45(1) (2012) 213-219.
[7] J.-R. Shi, C.-M. Yu, B.-W. Li, Y.-F. Xia, Z.-J. Xue, Experimental and numerical studies on the flame instabilities in porous media, Fuel, 106 (2013) 674-681.
[8] H. Wang, C. Wei, P. Zhao, T. Ye, Experimental study on temperature variation in a porous inert media burner for premixed methane air combustion, Energy, 72 (2014) 195-200.
[9] H. Gao, Z. Qu, X. Feng, W. Tao, Combustion of methane/ air mixtures in a two-layer porous burner: A comparison of alumina foams, beads, and honeycombs, Experimental Thermal and Fluid Science, 52 (2014) 215-220.
[10] B. Stelzner, C. Keramiotis, S. Voss, M. Founti, D. Trimis, Analysis of the flame structure for lean methane– air combustion in porous inert media by resolving the hydroxyl radical, Proceedings of the Combustion Institute, 35(3) (2015) 3381-3388.
[11] S.A. Shakiba, R. Ebrahimi, M. Shams, Z. Yazdanfar, Effects of foam structure and material on the performance of premixed porous ceramic burner, Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 229(2) (2015) 176-191.
[12] Y. Liu, A. Fan, H. Yao, W. Liu, A numerical investigation on the effect of wall thermal conductivity on flame stability and combustion efficiency in a mesoscale channel filled with fibrous porous medium, Applied Thermal Engineering, 101 (2016) 239-246.
[13] M.D. Emami, H. Atoof, M. Rezaeibakhsh, Flash- Back Phenomenon in a Two-Layer Porous Media: An Experimental Study, Journal of Porous Media, 19(3) (2016).
[14] S.A. Ghorashi, S.A. Hashemi, S.M. Hashemi, M. Mollamahdi, Experimental study on pollutant emissions in the novel combined porous-free flame burner, J Energy, 162 (2018) 517-525.
[15] S.M. Hashemi, S.A. Hashemi, Flame stability analysis of the premixed methane-air combustion in a two-layer porous media burner by numerical simulation, J Fuel, 202 (2017) 56-65.
[16] S.M. Hashemi, S.A. Hashemi, Numerical study of the flame stability of premixed methane–air combustion in a combined porous-free flame burner, J Proceedings of the Institution of Mechanical Engineers, Part A: Journal of PowerEnergy, (2018) 0957650918790662.
[17] R. Catapan, A. Oliveira, M. Costa, Non-uniform velocity profile mechanism for flame stabilization in a porous radiant burner, Experimental Thermal and Fluid Science, 35(1) (2011) 172-179.
[18] J.P. Holman, W.J. Gajda, Experimental methods for engineers, McGraw-Hill New York, 2001.
AUT Journal of Mechanical Engineering
Volume 4, Issue 1
March 2020
Pages 79-88

Files

Share

How to cite

Statistics