Experimental Study of Biogas Combustion in a Two-Layer Packed Bed Burner

Biogas is a promising low-calorific fuel composed of 50–80% CH4 and 20–50% CO2 and provides numerous economic and environmental benefits. In this study, biogas combustion in a two-layer porous burner packed with spherical alumina beads was experimentally investigated to provide guidelines for biogas burner design. The equivalence ratios varied from 0.75 to 0.95 at four different CO2 content values (25, 30, 35, and 40%). The flame stability limits at various equivalence ratios and CO2 concentrations were obtained. The range of biogas equivalence ratios for stable flame was at a higher level than the range for pure CH4. The flame tended to move from the upstream to the downstream region as the flame speed increased, resulting in high exhaust gas temperatures. The effects of the biogas CO2 ratio on the flame temperature, pressure drop of reaction flow, and radiation efficiency were also examined in detail. The NOx, CO, and HC emissions and the flame speed at the four CO2 concentrations were also analyzed. Th...

[1]  J. Ellzey,et al.  Modeling of filtration combustion in a packed bed , 1999 .

[2]  Alexei V. Saveliev,et al.  Hydrogen production in ultra-rich filtration combustion of methane and hydrogen sulfide , 2002 .

[3]  J. Ellzey,et al.  Measurements of Emissions and Radiation for Methane Combustion within a Porous Medium Burner , 1994 .

[4]  Ajay K. Agrawal,et al.  Experimental Study of Surface and Interior Combustion Using Composite Porous Inert Media , 2005 .

[5]  J. Ellzey,et al.  COMPUTATIONAL AND EXPERIMENTAL STUDY OF A TWO-SECTION POROUS BURNER , 2004 .

[6]  Janet L. Ellzey,et al.  Flame stabilization, operating range, and emissions for a methane/air porous burner , 2003 .

[7]  J. Ellzey,et al.  SUBADIABATIC AND SUPERADIABATIC PERFORMANCE OF A TWO-SECTION POROUS BURNER , 2005 .

[8]  Tadao Takeno,et al.  An Excess Enthalpy Flame Theory , 1979 .

[9]  F. Weinberg,et al.  Combustion Temperatures: The Future? , 1971, Nature.

[10]  Andrew T. Harris,et al.  Porous burners for lean-burn applications , 2008 .

[11]  Jose C. F. Pereira,et al.  Numerical Study of Combustion and Pollutants Formation in Inert Nonhomogeneous Porous Media , 1997 .

[12]  M. Toledo,et al.  Flame stabilization between two beds of alumina balls in a porous burner , 2010 .

[13]  K. Cen,et al.  Filtration combustion characteristics of low calorific gas in SiC foams , 2010 .

[14]  Robert J. Moffat,et al.  Describing the Uncertainties in Experimental Results , 1988 .

[15]  M. H. Akbari,et al.  Lean flammability limits for stable performance with a porous burner , 2009 .

[16]  J. Howell,et al.  Experimental and Numerical Study of Premixed Combustion Within Nonhomogeneous Porous Ceramics , 1993 .

[17]  L. Kennedy,et al.  Superadiabatic combustion of methane air mixtures under filtration in a packed bed , 1995 .

[18]  Jose C. F. Pereira,et al.  Effect of different downstream temperatures on the performance of a two-layer porous burner , 2010 .

[19]  Amir A. M. Oliveira,et al.  On the Combustion of Hydrogen-Rich Gaseous Fuels with Low Calorific Value in a Porous Burner , 2010 .

[20]  Janet L. Ellzey,et al.  Numerical study of the effects of material properties on flame stabilization in a porous burner , 2003 .

[21]  Susie Wood,et al.  Design and evaluation of a porous burner for the mitigation of anthropogenic methane emissions. , 2009, Environmental science & technology.

[22]  Numerical Study on the Influence of Radiative Properties in Porous Media Combustion , 2001 .

[23]  Mark J. Khinkis,et al.  Experimental study of a high-efficiency, low emission porous matrix combustor—heater☆ , 1995 .

[24]  Dimosthenis Trimis,et al.  Combustion of Low Calorific Gases from Landfills and Waste Pyrolysis Using Porous Medium Burner Technology , 2006 .

[25]  A. Barra,et al.  Heat recirculation and heat transfer in porous burners , 2004 .

[26]  R. Peck,et al.  ANALYSIS OF A BILAYERED POROUS RADIANT BURNER , 1996 .