A MODEL FOR PYROLYSIS OF WET WOOD

• Type: Article in International Scientific Journal
• Date: 1989

Authors

S. S. Alves (Author) Other; José Luís Figueiredo (Author) FEUP

Journal

Title: Chemical Engineering Science

Vol. 44 No. 10

Pages: 2861-2869

ISSN: 0009-2509

Publisher: Elsevier

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ISI Web of Knowledge - 85 Citations

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Other information

Authenticus ID: P-001-SW9

DOI: 10.1016/0009-2509(89)85096-1

Abstract (EN): A mathematical model of the pyrolysis of wet particles of wood is presented. The model integrates: (i) a conventional description of the physical and chemical phenomena involved in the pyrolysis of dry particles of wood, and (ii) a simplified drying model. The dry-pyrolysis model assumes a complex reaction scheme independently determined. The most important parameters were experimentally measured, including the thermal conductivities and all the kinetic parameters; other parameters were taken as average values from the literature. The drying model neglects bound-water diffusion, air/vapour diffusion and pressure gradients inside the solid. Free-water movement is not described. Drying is theredore controlled by heat supply. These assumptions restrict the model validity range to:(a) temperatures higher than 150°C, (b) initial moisture content below the free-water continuity point (¿45%), and (c) sample dimension in the wood longitudinal direction not much greater than the dimensions in the transversal directions. The combined wet pyrolysis model has been experimentally validated in the simulation of: (i) drying of pine wood cylinders of variable diameter above 150°C, and (ii) pyrolysis of dry and wet cylinders pine wood of variable diameter between 300 and 800°C. No parameters optimization was required. © 1989.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9