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Development of a semi-empirical equilibrium model for downdraft gasification systems

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  • Aydin, Ebubekir Siddik
  • Yucel, Ozgun
  • Sadikoglu, Hasan

Abstract

This study proposes a stoichiometric equilibrium model (SEM) to predict the chemical composition of the syngas, yield of tar and char produced by a downdraft gasifier for various wood based fuels for different equivalence ratios (ER). Equivalence ratio is a measure of the amount of external air supplied to the gasifier and one of the crucial operating variables in biomass gasification. Global stoichiometric equilibrium approach is used to model a downdraft gasifier. In order to predict dry gas composition, three different SEM models have been developed. Those models were validated and modified through comparison with the large amount of data collected from various sources. We have introduced two correction factors for altering the equilibrium constant of methanation and the water-gas shift reaction as a function of gasification temperature, equilibrium temperature and ER. Those correction factors were obtained by comparison of the theoretical models with experimental data of downdraft gasification of woody biomass from literature by using Levenberg-Marquadt algorithm. The modified model shows a clear enhancement in the prediction of the concentration for all gaseous species in the producer gas and tar yield. Furthermore, sensitivity analysis for SEM models has been performed using different higher heating value correlation for woody biomass.

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  • Aydin, Ebubekir Siddik & Yucel, Ozgun & Sadikoglu, Hasan, 2017. "Development of a semi-empirical equilibrium model for downdraft gasification systems," Energy, Elsevier, vol. 130(C), pages 86-98.
    • Handle: RePEc:eee:energy:v:130:y:2017:i:c:p:86-98
    DOI: 10.1016/j.energy.2017.04.132
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    Cited by:

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    2. Silva, Isabelly P. & Lima, Rafael M.A. & Silva, Gabriel F. & Ruzene, Denise S. & Silva, Daniel P., 2019. "Thermodynamic equilibrium model based on stoichiometric method for biomass gasification: A review of model modifications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 114(C), pages 1-1.
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    5. Safarian, Sahar & Unnthorsson, Runar & Richter, Christiaan, 2020. "The equivalence of stoichiometric and non-stoichiometric methods for modeling gasification and other reaction equilibria," Renewable and Sustainable Energy Reviews, Elsevier, vol. 131(C).
    6. Sérgio Ferreira & Eliseu Monteiro & Paulo Brito & Cândida Vilarinho, 2019. "A Holistic Review on Biomass Gasification Modified Equilibrium Models," Energies, MDPI, vol. 12(1), pages 1-31, January.
    7. David Antonio Buentello-Montoya & Miguel Ángel Armenta-Gutiérrez & Victor Manuel Maytorena-Soria, 2023. "Parametric Modelling Study to Determine the Feasibility of the Co-Gasification of Macroalgae and Plastics for the Production of Hydrogen-Rich Syngas," Energies, MDPI, vol. 16(19), pages 1-18, September.
    8. Hafiz Muhammad Uzair Ayub & Sang Jin Park & Michael Binns, 2020. "Biomass to Syngas: Modified Stoichiometric Thermodynamic Models for Downdraft Biomass Gasification," Energies, MDPI, vol. 13(20), pages 1, October.
    9. Mutlu, Ali Yener & Yucel, Ozgun, 2018. "An artificial intelligence based approach to predicting syngas composition for downdraft biomass gasification," Energy, Elsevier, vol. 165(PA), pages 895-901.
    10. 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.
    11. HajiHashemi, MohammadSina & Mazhkoo, Shahin & Dadfar, Hossein & Livani, Ehsan & Naseri Varnosefaderani, Aliakbar & Pourali, Omid & Najafi Nobar, Shima & Dutta, Animesh, 2023. "Combined heat and power production in a pilot-scale biomass gasification system: Experimental study and kinetic simulation using ASPEN Plus," Energy, Elsevier, vol. 276(C).
    12. Zhou, Hua & Xie, Taili & You, Fengqi, 2018. "On-line simulation and optimization of a commercial-scale shell entrained-flow gasifier using a novel dynamic reduced order model," Energy, Elsevier, vol. 149(C), pages 516-534.
    13. Huang, Y.W. & Chen, M.Q. & Li, Q.H. & Xing, W., 2018. "Hydrogen-rich syngas produced from co-gasification of wet sewage sludge and torrefied biomass in self-generated steam agent," Energy, Elsevier, vol. 161(C), pages 202-213.
    14. Gambarotta, Agostino & Morini, Mirko & Zubani, Andrea, 2018. "A non-stoichiometric equilibrium model for the simulation of the biomass gasification process," Applied Energy, Elsevier, vol. 227(C), pages 119-127.
    15. Ibrahim, A. & Veremieiev, S. & Gaskell, P.H., 2022. "An advanced, comprehensive thermochemical equilibrium model of a downdraft biomass gasifier," Renewable Energy, Elsevier, vol. 194(C), pages 912-925.
    16. Silva, Isabelly P. & Lima, Rafael M.A. & Santana, Hortência E.P. & Silva, Gabriel F. & Ruzene, Denise S. & Silva, Daniel P., 2022. "Development of a semi-empirical model for woody biomass gasification based on stoichiometric thermodynamic equilibrium model," Energy, Elsevier, vol. 241(C).
    17. Hafiz Muhammad Uzair Ayub & Sang Jin Park & Michael Binns, 2020. "Biomass to Syngas: Modified Non-Stoichiometric Thermodynamic Models for the Downdraft Biomass Gasification," Energies, MDPI, vol. 13(21), pages 1-17, October.
    18. Upadhyay, Darshit S. & Sakhiya, Anil Kumar & Panchal, Krunal & Patel, Amar H. & Patel, Rajesh N., 2019. "Effect of equivalence ratio on the performance of the downdraft gasifier – An experimental and modelling approach," Energy, Elsevier, vol. 168(C), pages 833-846.
    19. Tomasz Chmielniak & Leszek Stepien & Marek Sciazko & Wojciech Nowak, 2021. "Effect of Pyrolysis Reactions on Coal and Biomass Gasification Process," Energies, MDPI, vol. 14(16), pages 1-21, August.
    20. Ramos, Vinícius Faria & Pinheiro, Olivert Soares & Ferreira da Costa, Esly & Souza da Costa, Andréa Oliveira, 2019. "A method for exergetic analysis of a real kraft biomass boiler," Energy, Elsevier, vol. 183(C), pages 946-957.

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