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Modeling, simulation and optimization of downdraft gasifier: Studies on chemical kinetics and operating conditions on the performance of the biomass gasification process

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  • Chaurasia, Ashish

Abstract

The cracking of tar from rice husk pyrolysis is examined using tar reaction conditions similar to gasification and combustion because of the practical importance of tar cracking in the modeling of biomass gasification processes. Experiments have been performed in a two-stage gasifier to determine the kinetics of the tar cracking reaction. A new kinetic scheme is proposed for secondary tar cracking of biomass. The model is developed for downdraft biomass gasification and incorporates crucial effects of the pyrolysis fraction and char reactivity factor in its simulations. The model equations are solved using COMSOL Multiphysics. This model provides better agreement with experimental data than the model proposed by other researcher. This model is used to examine the influence of operating conditions in the gasifier, such as the length of the gasification zone, initial gas temperature, air flowrate, and mole fraction of oxygen in primary air, on product compositions (CO, CO2, H2, CH4, and tar). The result concludes that the increase in temperature leads to higher composition of carbon monoxide and lower composition of tar, and consequently higher low heating value (LHV). In addition, sensitivity analysis has been conducted to determine the influence of these parameters on product compositions.

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  • Chaurasia, Ashish, 2016. "Modeling, simulation and optimization of downdraft gasifier: Studies on chemical kinetics and operating conditions on the performance of the biomass gasification process," Energy, Elsevier, vol. 116(P1), pages 1065-1076.
    • Handle: RePEc:eee:energy:v:116:y:2016:i:p1:p:1065-1076
    DOI: 10.1016/j.energy.2016.10.037
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    1. Fagbemi, L & Khezami, L & Capart, R, 2001. "Pyrolysis products from different biomasses: application to the thermal cracking of tar," Applied Energy, Elsevier, vol. 69(4), pages 293-306, August.
    2. Beenackers, A.A.C.M., 1999. "Biomass gasification in moving beds, a review of European technologies," Renewable Energy, Elsevier, vol. 16(1), pages 1180-1186.
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    1. Smith Lewin, Caroline & Fonseca de Aguiar Martins, Ana Rosa & Pradelle, Florian, 2020. "Modelling, simulation and optimization of a solid residues downdraft gasifier: Application to the co-gasification of municipal solid waste and sugarcane bagasse," Energy, Elsevier, vol. 210(C).
    2. Gautam, Neha & Chaurasia, Ashish, 2020. "Study on kinetics and bio-oil production from rice husk, rice straw, bamboo, sugarcane bagasse and neem bark in a fixed-bed pyrolysis process," Energy, Elsevier, vol. 190(C).
    3. Taheri, M.H. & Mosaffa, A.H. & Farshi, L. Garousi, 2017. "Energy, exergy and economic assessments of a novel integrated biomass based multigeneration energy system with hydrogen production and LNG regasification cycle," Energy, Elsevier, vol. 125(C), pages 162-177.
    4. Stanislaw Szwaja & Anna Poskart & Monika Zajemska & Magdalena Szwaja, 2019. "Theoretical and Experimental Analysis on Co-Gasification of Sewage Sludge with Energetic Crops," Energies, MDPI, vol. 12(9), pages 1-15, May.
    5. Qian, Hongliang & Chen, Wei & Zhu, Weiwei & Liu, Chang & Lu, Xiaohua & Guo, Xiaojing & Huang, Dechun & Liang, Xiaodong & Kontogeorgis, Georgios M., 2019. "Simulation and evaluation of utilization pathways of biomasses based on thermodynamic data prediction," Energy, Elsevier, vol. 173(C), pages 610-625.
    6. Chaurasia, Ashish, 2019. "Modeling of downdraft gasification process: Part I - Studies on shrinkage effect on tabular, cylindrical and spherical geometries," Energy, Elsevier, vol. 169(C), pages 130-141.
    7. Safarian, Sahar & Unnþórsson, Rúnar & Richter, Christiaan, 2019. "A review of biomass gasification modelling," Renewable and Sustainable Energy Reviews, Elsevier, vol. 110(C), pages 378-391.
    8. Chaurasia, Ashish, 2018. "Modeling of downdraft gasification process: Studies on particle geometries in thermally thick regime," Energy, Elsevier, vol. 142(C), pages 991-1009.
    9. Martínez, Laura V. & Rubiano, Jairo E. & Figueredo, Manuel & Gómez, María F., 2020. "Experimental study on the performance of gasification of corncobs in a downdraft fixed bed gasifier at various conditions," Renewable Energy, Elsevier, vol. 148(C), pages 1216-1226.
    10. Chaurasia, Ashish, 2020. "Modeling of downdraft gasification process: Part II - Studies on the effect of shrinking and non-shrinking biomass geometries on the performance of gasification process," Energy, Elsevier, vol. 207(C).
    11. Alejandro Lyons Cerón & Alar Konist & Heidi Lees & Oliver Järvik, 2021. "Effect of Woody Biomass Gasification Process Conditions on the Composition of the Producer Gas," Sustainability, MDPI, vol. 13(21), pages 1-17, October.
    12. Yuan, Peng & Shen, Boxiong & Duan, Dongping & Adwek, George & Mei, Xue & Lu, Fengju, 2017. "Study on the formation of direct reduced iron by using biomass as reductants of carbon containing pellets in RHF process," Energy, Elsevier, vol. 141(C), pages 472-482.
    13. Yepes Maya, Diego Mauricio & Silva Lora, Electo Eduardo & Andrade, Rubenildo Vieira & Ratner, Albert & Martínez Angel, Juan Daniel, 2021. "Biomass gasification using mixtures of air, saturated steam, and oxygen in a two-stage downdraft gasifier. Assessment using a CFD modeling approach," Renewable Energy, Elsevier, vol. 177(C), pages 1014-1030.

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