Use of a transient model to simulate fluidized bed incineration of sewage sludge

This paper presents a mathematical model dedicated to fluidized bed incineration of sludge. The main assumptions as well as the principal equations of the model are presented. Basically, this model relies on instantaneous pyrolysis of sludge and on a five zones description of the hydrodynamics into...

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Bibliographic Details
Published in:Journal of hazardous materials 2006-07, Vol.135 (1), p.200-209
Main Authors: Khiari, B., Marias, F., Zagrouba, F., Vaxelaire, J.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical and Process Engineering
Chemical engineering
Computer Simulation
Engineering Sciences
Environmental Engineering
Environmental Sciences
Exact sciences and technology
Fluidization
Fluidized bed
Hydrodynamics of contact apparatus
Incineration
Modeling
Models, Chemical
Other industrial wastes. Sewage sludge
Pollution
Sewage - chemistry
Sludge
Temperature
Wastes
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Summary:This paper presents a mathematical model dedicated to fluidized bed incineration of sludge. The main assumptions as well as the principal equations of the model are presented. Basically, this model relies on instantaneous pyrolysis of sludge and on a five zones description of the hydrodynamics into the incinerator. Its originality is essentially due to the introduction of a two-dimensional buffer zone between the bubble and the emulsion phase. The chemistry of the gaseous system is described by chemical equilibrium. Results of a start up procedure have been presented in order to illustrate the ability of the model to describe transient behavior. To validate the model from an energetic point of view, different types of sludge (primary, activated and digested) have been computed and compared to industrial data and to results obtained from a simple calculation. The lower dryness limit corresponds to self incineration of the sludge. The higher one corresponds to maximal thermal level that should not be exceeded within the furnace.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2005.11.068