Steam co-gasification of biomass and coal in decoupled reactors

Abstract Steam co-gasification of pine sawdust and bituminous coal was conducted in a lab-scale external circulating radial-flow moving bed (ECRMB) gasification system. The system is composed of three decoupled reactors, i.e., a gas–solid countercurrent moving bed pyrolyzer, a radial-flow moving bed gasifier and a riser-type combustor. Calcined olivine was used as circulating heat carrier and in-situ tar destruction catalyst as well. The influences of biomass blending ratio (BR), pyrolyzer temperature, gasifier temperature and steam to carbon mass ratio (S/C) on the gasification performance were investigated. The results indicated that the gas and tar yields increased with the increase of BR. Synergetic effect based on gas composition was found during co-gasification. At the S/C range of 0 to 1.3, the gas yield and H 2 content in product gas increased but CO 2 decreased with the increase of S/C. Higher gasifier temperature promoted the gas yield, H 2  + CO in product gas, carbon conversion and chemical efficiency of the process. A gas yield of 0.60 Nm 3 /kg daf and a tar yield of 5.8 g/Nm 3 in the gas were obtained at the gasifier temperature of 850 °C, BR of 50% and S/C of 1.3. Pyrolyzer temperature at the range of 500 to 700 °C had no remarkable influence on the product gas composition.

[1]  Guangwen Xu,et al.  Decoupled thermochemical conversion - Preface , 2013 .

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

[3]  S. Pang,et al.  Co-gasification of blended lignite and wood pellets in a dual fluidized bed steam gasifier: The influence of lignite to fuel ratio on NH3 and H2S concentrations in the producer gas , 2015 .

[4]  X. Bi,et al.  Co-gasification of biosolids with biomass: Thermogravimetric analysis and pilot scale study in a bubbling fluidized bed reactor. , 2015, Bioresource technology.

[5]  X. Bi,et al.  From fossil fuels towards renewables: Inhibitory and catalytic effects on carbon thermochemical conversion during co-gasification of biomass with fossil fuels , 2015 .

[6]  Li-gang Wei,et al.  Catalytic steam gasification of lignite with olivine as solid heat carrier , 2013 .

[7]  Shiqiu Gao,et al.  Technical Review on Thermochemical Conversion Based on Decoupling for Solid Carbonaceous Fuels , 2013 .

[8]  Carlos F. Valdés,et al.  Co-gasification of Colombian coal and biomass in fluidized bed: An experimental study , 2009 .

[9]  H. Fredriksson,et al.  Chemical looping capabilities of olivine, used as a catalyst in indirect biomass gasification , 2014 .

[10]  Hermann Hofbauer,et al.  Comparison of the performance behaviour of silica sand and olivine in a dual fluidised bed reactor system for steam gasification of biomass at pilot plant scale. , 2011 .

[11]  G. Cheng,et al.  Co-gasification of wet sewage sludge and forestry waste in situ steam agent. , 2012, Bioresource technology.

[12]  H. Hofbauer,et al.  Co-Gasification of Wood and Lignite in a Dual Fluidized Bed Gasifier , 2013 .

[13]  Li Dong,et al.  Decoupling Gasification: Approach Principle and Technology Justification , 2010 .

[14]  Guangyong Wang,et al.  Tar formation during co-gasification of biomass and coal under different gasification condition , 2015 .

[15]  D. Baxter,et al.  Combined gasification of coal and biomass in internal circulating fluidized bed , 2012 .

[16]  Rong Zhang,et al.  Experimental study on syngas production by co-gasification of coal and biomass in a fluidized bed , 2010 .

[17]  RajenderKumar Gupta,et al.  Co-gasification of Biomass with Coal and Oil Sand Coke in a Drop Tube Furnace† , 2010 .

[18]  G. Guan,et al.  Steam co-gasification of brown seaweed and land-based biomass , 2014 .

[19]  F. Pinto,et al.  Co-gasification of coal and wastes in a pilot-scale installation. 2: Effect of catalysts in syngas treatment to achieve sulphur and nitrogen compounds abatement , 2010 .

[20]  K. Sjöström,et al.  Promoted reactivity of char in co-gasification of biomass and coal : synergies in the thermochemical process , 1999 .

[21]  Rafael Kandiyoti,et al.  Co-pyrolysis and co-gasification of coal and biomass in bench-scale fixed-bed and fluidised bed reactors , 1999 .

[22]  G. A. Norton,et al.  Catalytic effects observed during the co-gasification of coal and switchgrass , 2000 .

[23]  S. Pang,et al.  Co-gasification of blended lignite and wood pellets in a 100 kW dual fluidised bed steam gasifier: the influence of lignite ratio on producer gas composition and tar content , 2013 .

[24]  A. Smoliński,et al.  Effect of fuel blend composition on the efficiency of hydrogen-rich gas production in co-gasification of coal and biomass , 2014 .

[25]  Aadu Paist,et al.  Atmospheric fluidized bed gasification of untreated and leached olive residue, and co-gasification of olive residue, reed, pine pellets and Douglas fir wood chips , 2012 .

[26]  Hermann Hofbauer,et al.  Co-gasification of coal and wood in a dual fluidized bed gasifier , 2011 .

[27]  Myung Won Seo,et al.  Gasification Characteristics of Coal/Biomass Blend in a Dual Circulating Fluidized Bed Reactor , 2010 .

[28]  S. Rapagnà.  Steam-gasification of biomass in a fluidised-bed of olivine particles. , 2000 .

[29]  Yan Zhang,et al.  Co-gasification Reactivity of Coal and Woody Biomass in High-Temperature Gasification† , 2010 .

[30]  Changhou Liu,et al.  A novel process of biomass gasification for hydrogen-rich gas with solid heat carrier : Preliminary experimental results , 2006 .

[31]  Shaoping Xu,et al.  Biomass gasification in an external circulating countercurrent moving bed gasifier , 2013 .

[32]  Luis Puigjaner,et al.  Fluidized-bed co-gasification of residual biomass/poor coal blends for fuel gas production , 2000 .

[33]  J. Xiang,et al.  Interaction and kinetic analysis for coal and biomass co-gasification by TG-FTIR. , 2014, Bioresource technology.

[34]  H. Hofbauer,et al.  Biomass steam gasification--an extensive parametric modeling study. , 2001, Bioresource technology.

[35]  Isabel Cabrita,et al.  Fluidised bed co-gasification of coal and olive oil industry wastes , 2005 .

[36]  Li Wang,et al.  Co-pyrolysis behaviors of saw dust and Shenfu coal in drop tube furnace and fixed bed reactor. , 2013, Bioresource Technology.