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Effects of Porous Structure Development and Ash on the Steam Gasification Reactivity of Biochar Residues from a Commercial Gasifier at Different Temperatures

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  • Saiman Ding

    (Department of Chemical Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden)

  • Efthymios Kantarelis

    (Department of Chemical Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden)

  • Klas Engvall

    (Department of Chemical Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden)

Abstract

The present study aims at investigating the effects of porous structure development and ash content on the observed reactivity during steam gasification of biochar residues from a commercial gasifier. The experiments were conducted at a temperature range of 700 to 800 °C using biochar, derived from entrained flow gasification of biomass, under isothermal conditions using a thermogravimetric analyzer. The pore size distribution, surface area and morphology of char samples were determined by N 2 physiosorption and scanning electron microscopy (SEM). The results showed that the gasification temperature does not affect the porous structure development considerably. The total surface area of char exhibits a threefold increase, while the total pore volume increase ranges between 2.0 and 5.3 times, at all temperatures. Both properties are directly proportional to the observed reactivity, especially at conversions up to 70%. Catalytic effects of the mineral matter of the char (mainly potassium) become predominant at the later stages of conversion (conversion greater than 70%).

Suggested Citation

  • Saiman Ding & Efthymios Kantarelis & Klas Engvall, 2020. "Effects of Porous Structure Development and Ash on the Steam Gasification Reactivity of Biochar Residues from a Commercial Gasifier at Different Temperatures," Energies, MDPI, vol. 13(19), pages 1-19, September.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:19:p:5004-:d:418012
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    Cited by:

    1. Anna Trubetskaya, 2022. "Reactivity Effects of Inorganic Content in Biomass Gasification: A Review," Energies, MDPI, vol. 15(9), pages 1-36, April.

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