Article (Scientific journals)
Investigation on Convective Drying of Mixtures of Sewage Sludge and Sawdust in a Fixed Bed
Li, Jie; Fraikin, Laurent; Salmon, Thierry et al.
2014In Drying Technology
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Keywords :
Sewage sludge; Sawdust; Convective drying; Mixing; Shrinkage; X-ray tomography
Abstract :
[en] This work is a part of a project aiming at developing a renewable fuel for gasification purposes, through convective drying of sludge/wood mixtures. The first step consists of characterizing the behavior of sawdust/sludge mixtures during the application of convective drying. The influence of the mixing step (no mixing against 30 s at 40 rpm), as well as the sawdust/sludge ratio (1/9, 2/8, 3/7 and 4/6 on a dry basis) and the effect of the drying temperature (50 °C, 80 °C and 110 °C) have been investigated. In this study, X-ray tomography, a non-invasive imaging technique, is used to assess changes in the volume, void and exchange surface at the beginning and the end of the drying process. Results first confirm the importance of the mixing step on the drying behavior: the drying rate of the mixed sludge is lower than that of the original sludge. Nevertheless the addition of sawdust is shown to have a positive impact on the drying process from a mass ratio of 2/8, with drying rates higher than that of the original sludge. With increasing amount of sawdust, the initial and final bed volumes, initial and final total exchange surfaces, and initial void fraction increase linearly, but the bed volume shrinkage and final void fraction decrease linearly.
Disciplines :
Chemistry
Author, co-author :
Li, Jie ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Procédés et développement durable
Fraikin, Laurent ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Procédés et développement durable
Salmon, Thierry ;  Université de Liège - ULiège > Département de chimie appliquée > Département de chimie appliquée
Bennamoun, Lyes;  University of New Brunswick > Department of Mechanical Engineering
Toye, Dominique  ;  Université de Liège - ULiège > Département de chimie appliquée > Génie de la réaction et des réacteurs chimiques
Schreinemachers, Raphael;  Industrie du Bois Vielsalm & Cie SA
Language :
English
Title :
Investigation on Convective Drying of Mixtures of Sewage Sludge and Sawdust in a Fixed Bed
Publication date :
October 2014
Journal title :
Drying Technology
ISSN :
0737-3937
eISSN :
1532-2300
Publisher :
Taylor & Francis Ltd, New York, United States - New York
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 12 December 2014

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