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

Saiman Ding, Efthymios Kantarelis and Klas Engvall
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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

Energies, 2020, vol. 13, issue 19, 1-19

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%).

Keywords: steam gasification; char reactivity; pore structure; ash effects (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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