title: Investigating the morphology and reactivity of chars from Triplochiton scleroxylon pyrolysed under varied conditions.
abstract: A gasifier may be optimised via a good understanding of the char formation, morphology and reactivity. The effects of varying the pyrolysis pressure and heating rate on the morphology of the char were investigated using a thermogravimetric analyser (TGA), scanning electron microscope (SEM) and micrograph spot analyser. The gasified chars were produced at heating rates of 5, 10 and 20°C/min and pressures of 0.1, 0.4 and 0.6 MPa. All the chars have different degrees of apparent gasification reactivity. The random pore model (RPM) provided a better description of the experiment, with low average error values, θ, in all of the cases considered. The alkaline and alkaline earth metals (AAEM) in the tropical wood biomass Arere (Triplochiton scleroxylon) consist predominantly of calcium and could altogether be partly responsible for the noticeably high reactivity nature of the tropical Arere chars.
authors.affiliation: Swedish Centre for Resource Recovery (SCRR), University of Borås, SE-501 90 Borås, Sweden. Electronic address: kehinde.oluoti@hb.se.
authors.forename: Kehinde
authors.initials: K
authors.lastname: Oluoti
authors.affiliation: Swedish Centre for Resource Recovery (SCRR), University of Borås, SE-501 90 Borås, Sweden.
authors.forename: Anita
authors.initials: A
authors.lastname: Pettersson
authors.affiliation: Swedish Centre for Resource Recovery (SCRR), University of Borås, SE-501 90 Borås, Sweden.
authors.forename: Tobias
authors.initials: T
authors.lastname: Richards
mesh_terms: D018533:Biomass; D002118:Calcium / Q000032:analysis; D005740:Gases; D006361:Heating; D019660:Malvaceae / Q000737:chemistry*; D008673:Metals, Alkaline Earth / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D008962:Models, Theoretical; D011312:Pressure; D013818:Thermogravimetry; D014934:Wood / Q000737:chemistry*
chemical_list: D005740:Gases; D008673:Metals, Alkaline Earth; D002118:Calcium
keywords: Calcium crystals; Char morphology; Gasification kinetics; Pyrolysis; Tropical biomass