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Solar pyrolysis of biomass - part II: The physicochemical structure evolution of char by Dian Zhong; Zheshao Chang; Kuo Zeng; Jun Li; Yi Qiu; Qiang Lu; Gilles Flamant; Haiping Yang; Hanping Chen is a Engineering article available to read on EtoBox.

What is Solar pyrolysis of biomass - part II: The physicochemical structure evolution of char about?

Dynamic solar pyrolysis experiments of willow pellets with different thicknesses (3 mm, 1 mm and 0.5 mm) were conducted at heat flux densities of 0.5 and 1.1 MW/m2 to study the physicochemical structure evolution of char. Characterizations of the physical structure showed that the reflectivity of char surface firstly reached the minimum value of 7.3 % and then rebounded to 15.3 %. The specific surface area decreased with reaction time from 13.2 to 2.0 m2/g, indicating its poor microscale pore structure (pore size ≤500 nm). The 3D scanning conducted by computed tomography (micro-CT system) showed that the residue pellet has unique hierarchical layers with different density and porosity. The lamellar structure can be also found inside the char layer which may be due to the increasing temperature gradient and the internal pressure caused by the volatile release. Concerning the chemical structure evolution, the secondary coking of the heavy compounds in volatiles introduced more oxygen-containing groups and alkyl side chains into the char layer. The aromatic rings system in the inner part of char was developed through removal of side-chains and functional groups. Further structure orde

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Author

Dian Zhong; Zheshao Chang; Kuo Zeng; Jun Li; Yi Qiu; Qiang Lu; Gilles Flamant; Haiping Yang; Hanping Chen

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)