✦ LIBER ✦

A gas-solid reaction model for flash wood pyrolysis

✍ Scribed by M.A. Hastaoglu; F. Berruti

Publisher: Elsevier Science
Year: 1989
Tongue: English
Weight: 882 KB
Volume: 68
Category: Article
ISSN: 0016-2361
DOI: 10.1016/0016-2361(89)90038-0

No coin nor oath required. For personal study only.

✦ Synopsis

A theoretical modelling study of wood flash pyrolysis has been carried out using the single pellet technique. The model considers the transient behaviour of a single wood particle undergoing a fast thermal decomposition reaction. Mass transfer, pressure gradients in the pellet, heat transfer via convection, conduction and radiation, and structural changes occurring in the particle are accounted for. The wood particle is assumed to consist of libres of hollow cylindrical shape. The pyrolysis reaction occurs at an interface within each fibre, which moves with time. The kinetic mechanism for the reaction assumes the wood to decompose according to two parallel reactions yielding tar and and (gas +char). Tar is then assumed to decompose further by secondary homogeneous cracking reactions to yield gas. The results of the modelling work compare favourably with experimental data of conversion and temperature over a wide range of operating temperatures.

📜 SIMILAR VOLUMES

A model for solid—gas reactions

✍ A.N. Gokarn; L.K. Doraiswamy 📂 Article 📅 1971 🏛 Elsevier Science 🌐 English ⚖ 894 KB

A model for pyrolysis of wet wood

✍ S.S. Alves; J.L. Figueiredo 📂 Article 📅 1989 🏛 Elsevier Science 🌐 English ⚖ 879 KB

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 pf dry particles of wood, and (ii) a simplified drying model. The dry-pyrolysis model assumes a complex r

A model for primary and heterogeneous se

A model for primary and heterogeneous secondary reactions of wood pyrolysis

✍ Pradeep Ahuja; Prof. Dr. Surendra Kumar; Prof. Dr. Prem Chand Singh 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 1022 KB

A single-pore model for gas-solid noncat

A single-pore model for gas-solid noncatalytic reactions

✍ P. A. Ramachandran; J. M. Smith 📂 Article 📅 1977 🏛 American Institute of Chemical Engineers 🌐 English ⚖ 776 KB

## Abstract Analysis of single‐pore behavior in a porous pellet of reactant is used to develop a new model for predicting the conversion‐time relationship for gas‐solid noncatalytic reactions. The model accounts for the influence of pore diffusion, diffusion through the product layer which builds u

A changing grain size model for gas—soli

A changing grain size model for gas—solid reactions

✍ Christos Georgakis; C.W. Chang; J. Szekely 📂 Article 📅 1979 🏛 Elsevier Science 🌐 English ⚖ 363 KB

Parallel plate model for noncatalytic ga

Parallel plate model for noncatalytic gas—solid reactions

✍ Chieh Chu 📂 Article 📅 1972 🏛 Elsevier Science 🌐 English ⚖ 414 KB

A parallel plate model is suggested for describing noncatalytic gas-solid reactions. Based on this model, expressions are developed which relate explicitly the progress of the reaction to porosity of the solid matrix, diffisivities in the pore and in the ash, reactant concentrations in the gas phase