Entrained-flow gasification of torrefied tomato peels: Combining torrefaction experiments with chemical equilibrium modeling for gasification

Abstract The purpose of the present study is to quantify the impact of torrefaction pretreatment on the quality of the product gas arising from the gasification with steam and steam-oxygen mixtures of non-woody biomass in high-temperature entrained flow reactors. To this aim, a chemical equilibrium model for biomass gasification was adopted, which allowed predicting the product gas composition as a function of process temperature, equivalence ratio, steam-to-biomass ratio and biomass elemental composition. A global sensitivity analysis with respect to the model input parameters was performed to assess the impact of torrefaction and gasification operating conditions on the quality of the product gas in terms of heating value and composition metrics typically adopted in the process industry (H2/CO ratio, stoichiometric module, etc.). In particular, the gasification of raw tomato peels and related torrefied solids resulting from fluidized bed torrefaction tests performed under light (200 °C and 30 min), medium (240 °C and 30 min) and severe (285 °C and 30 min) conditions was investigated using ultimate analysis data in the model. Results of this analysis highlighted that the quality of product gas arising from the oxygen-steam gasification of torrefied and untreated tomato peels did not differ very much, although torrefied feedstocks produced more H2 and CO and less CO2 than the parent one. This suggests that, despite the significant benefits it determines in biomass feeding, grinding and storage, the torrefaction pretreatment provides only a marginal improvement in the product gas quality. Equilibrium simulations made available in the present study can be useful for a better understanding of the controlling variables that rule gasification processes in addition to act as a point of reference for more complex simulations of the high temperature entrained flow gasification of biomass with oxygen-steam mixtures.

[1]  M. Miccio,et al.  Pressurized steam torrefaction of biomass: Focus on solid, liquid, and gas phase distributions , 2017 .

[2]  Prabir Basu,et al.  Biomass Gasification, Pyrolysis and Torrefaction: Practical Design and Theory , 2013 .

[3]  Dimitrios P. Tassios,et al.  Solid waste plasma gasification: Equilibrium model development and exergy analysis , 2006 .

[4]  T. O. Rodrigues,et al.  The fluidization behaviour of torrefied biomass in a cold model , 2012 .

[5]  M. Miccio,et al.  Torrefaction of Tomato Peel Residues in a Fluidized Bed of Inert Particles and a Fixed-Bed Reactor , 2016 .

[6]  H. Spliethoff,et al.  Air-Blown Entrained Flow Gasification of Biomass: Influence of Operating Conditions on Tar Generation , 2017 .

[7]  M. Miccio,et al.  Fluidized bed co-gasification of biomass and polymeric wastes for a flexible end-use of the syngas: Focus on bio-methanol , 2014 .

[8]  P K Senapati,et al.  Experimental investigation on an entrained flow type biomass gasification system using coconut coir dust as powdery biomass feedstock. , 2012, Bioresource technology.

[9]  E. Furusjö,et al.  Reduction of Tar and Soot Formation from Entrained-Flow Gasification of Woody Biomass by Alkali Impregnation , 2017 .

[10]  A. Bridgwater.  The technical and economic feasibility of biomass gasification for power generation , 1995 .

[11]  Marcelo Echegaray,et al.  Equilibrium model of the gasification process of agro-industrial wastes for energy production , 2014 .

[12]  V. Sadykov,et al.  Water–Gas Shift Reaction over Ni/CeO2 Catalysts , 2017 .

[13]  Paola Brachi,et al.  Pseudo-component thermal decomposition kinetics of tomato peels via isoconversional methods , 2016 .

[14]  M. Vaezi,et al.  Gasification of heavy fuel oils: A thermochemical equilibrium approach , 2009 .

[15]  Paola Lettieri,et al.  Two stage fluid bed-plasma gasification process for solid waste valorisation: technical review and preliminary thermodynamic modelling of sulphur emissions. , 2012, Waste management.

[16]  Dimitrios P. Tassios,et al.  Applied Chemical Engineering Thermodynamics , 2014 .

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

[18]  Alina Żogała,et al.  Critical Analysis of Underground Coal Gasification Models. Part I: Equilibrium Models – Literary Studies , 2014, Journal of Sustainable Mining.

[19]  Chuang-zhi Wu,et al.  Hydrogen-rich gas production from biomass air and oxygen/steam gasification in a downdraft gasifier , 2007 .

[20]  Xueli Chen,et al.  Pyrolysis pretreatment of biomass for entrained-flow gasification , 2010 .

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

[22]  Jianzhong Lin,et al.  Influence of Torrefaction on Biomass Gasification Performance in a High-Temperature Entrained-Flow Reactor , 2016 .

[23]  Y. Lwin,et al.  Chemical Equilibrium by Gibbs Energy Minimization on Spreadsheets , 2000 .

[24]  Anders Nordin,et al.  Entrained flow gasification of torrefied wood residues , 2014 .

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

[26]  E. Furusjö,et al.  Thermodynamic equilibrium analysis of entrained flow gasification of spent pulping liquors , 2018 .

[27]  Carlos Roberto Altafini,et al.  Prediction of the working parameters of a wood waste gasifier through an equilibrium model , 2003 .

[28]  J. C. Bruno,et al.  MODIFIED THERMODYNAMIC EQUILIBRIUM MODEL FOR BIOMASS GASIFICATION: A STUDY OF THE INFLUENCE OF OPERATING CONDITIONS , 2012 .

[29]  G. Cornacchia,et al.  Theoretical and experimental procedure for scaling-up RDF gasifiers: The Gibbs Gradient Method , 2016 .

[30]  L. I. Darvell,et al.  Combustion and gasification characteristics of chars from raw and torrefied biomass. , 2012, Bioresource technology.

[31]  G. Aranda,et al.  Effect of steam content in the air–steam flow on biomass entrained flow gasification , 2012 .

[32]  Mehrdji Hemati,et al.  Biomass steam gasification in fluidized bed of inert or catalytic particles: Comparison between experimental results and thermodynamic equilibrium predictions , 2011 .

[33]  Enrique Salaices,et al.  Biomass Catalytic Steam Gasification Thermodynamics Analysis and Reaction Experiments in a CREC Riser Simulator , 2010 .

[34]  Morvin Savio Martis.  Validation of simulation based models: A theoretical outlook , 2006 .

[35]  N. A. Adewole,et al.  Charcoal Yield from Urban-Tree Residues Generated in University of Ibadan, Nigeria using Earth Mound Method , 2016 .

[36]  S. Kong,et al.  Combustion and NOx emissions of biomass-derived syngas under various gasification conditions utilizing oxygen-enriched-air and steam , 2013 .

[37]  R. Chirone,et al.  Fluidized Bed Gasification of Biomass and Biomass/Coal Pellets in Oxygen and Steam Atmosphere , 2013 .

[38]  Animesh Dutta,et al.  Thermodynamic Equilibrium Model and Second Law Analysis of a Downdraft Waste Gasifier , 2007 .

[39]  Yulianto Sulistyo Nugroho,et al.  Experimental Gasification of Biomass in an Updraft Gasifier with External Recirculation of Pyrolysis Gases , 2014 .

[40]  M. Miccio,et al.  Valorization of sugar beet pulp via torrefaction with a focus on the effect of the preliminary extraction of pectins , 2017 .

[41]  Ke Qin,et al.  Biomass Gasification Behavior in an Entrained Flow Reactor: Gas Product Distribution and Soot Formation , 2012 .