Biomass Gasification Behavior in an Entrained Flow Reactor: Gas Product Distribution and Soot Formation

Biomass gasification and pyrolysis were studied in a laboratory-scale atmospheric pressure entrained flow reactor. Effects of operating parameters and biomass types on the syngas composition were investigated. In general, the carbon conversion during biomass gasification was higher than 90% at the optimal conditions of 1400 °C with steam addition. The biomass carbon that was not converted to gas in the gasification process only appeared as soot particles in the syngas in all of the experiments, except for the two experiments performed at 1000 °C, where a very small amount of char was also left. In comparison to pyrolysis, lower yields of soot, H2, and CO were produced during gasification. The yield of soot could be reduced by a longer residence time, larger feeder air flow, lower oxygen concentration, higher excess air ratio, higher steam/carbon ratio, and higher reactor temperature. Changes in residence time, feeder air flow, and oxygen concentration did not show a noticeable influence on H2 and CO yield...

[1]  Glassman,et al.  The Effect of Oxygen Concentration on Sooting Diffusion Flames , 1980 .

[2]  Thomas Nussbaumer,et al.  Mechanisms and kinetics of homogeneous secondary reactions of tar from continuous pyrolysis of wood chips , 2002 .

[3]  Peter Glarborg,et al.  Hidden interactions—Trace species governing combustion and emissions , 2007 .

[4]  J. Kent,et al.  The effect of alkali metals on a laminar ethylene diffusion flame , 1993 .

[5]  Peter Arendt Jensen,et al.  High-temperature entrained flow gasification of biomass , 2012 .

[6]  I. Glassman.  Soot formation in combustion processes , 1989 .

[7]  P. A. Jensen,et al.  Production of methanol/DME from biomass: EFP06 , 2011 .

[8]  E. M. Bulewicz,et al.  Effect of metallic additives on soot formation processes in flames , 1975 .

[9]  K. Cen,et al.  Biomass-oxygen gasification in a high-temperature entrained-flow gasifier. , 2009, Biotechnology advances.

[10]  Peter McKendry,et al.  Energy production from biomass (Part 3): Gasification technologies. , 2002, Bioresource technology.

[11]  M. A. Rabah,et al.  Low cost hydrogen production from waste , 1989 .

[12]  B. Haynes,et al.  The effect of metal additives on the formation of soot in premixed flames , 1979 .

[13]  Peter McKendry,et al.  Energy production from biomass (Part 1): Overview of biomass. , 2002, Bioresource technology.

[14]  A. Demirbas,et al.  Combustion characteristics of different biomass fuels , 2004 .

[15]  Yijun Zhao,et al.  Characteristics of rice husk gasification in an entrained flow reactor. , 2009, Bioresource technology.

[16]  T. A. Milne,et al.  Biomass Gasifier "Tars": Their Nature, Formation, and Conversion , 1998 .

[17]  Zhong-yang Luo,et al.  Biomass pyrolysis/gasification for product gas production: the overall investigation of parametric effects , 2003 .

[18]  Prabir Basu,et al.  Biomass Gasification and Pyrolysis: Practical Design and Theory , 2010 .

[19]  Thomas A. Milne,et al.  Molecular characterization of the pyrolysis of biomass , 1987 .

[20]  J. Howard,et al.  Soot control by fuel additives , 1980 .

[21]  C. M. Kinoshita,et al.  Experimental analysis of biomass gasification with steam and oxygen , 1992 .

[22]  Yijun Zhao,et al.  Experimental study on sawdust air gasification in an entrained-flow reactor , 2010 .

[23]  J. J. Hernández,et al.  Gasification and co-gasification of biomass wastes : Effect of the biomass origin and the gasifier operating conditions , 2008 .

[24]  Peter McKendry,et al.  Energy production from biomass (Part 2): Conversion technologies. , 2002, Bioresource technology.

[26]  Branislav Repić,et al.  Experimental investigation of role of steam in entrained flow coal gasification , 2007 .

[27]  Claes Brage,et al.  Guideline for sampling and analysis of tar and particles in biomass producer gases , 2008 .

[28]  Alexander L. Brown,et al.  Soot in coal combustion systems , 1997 .

[29]  A. Bula,et al.  Gasification of biomass wastes in an entrained flow gasifier: Effect of the particle size and the residence time , 2010 .

[30]  A. Demirbas,et al.  Yields of hydrogen-rich gaseous products via pyrolysis from selected biomass samples , 2001 .

[31]  Thomas E. Drennen,et al.  Renewable Energy: Sources for Fuels and Electricity , 1994 .

[32]  B. Stanmore,et al.  The oxidation of soot: a review of experiments, mechanisms and models , 2001 .