Home Sciences & Innovations Sciences Modelling Fume Deposit Growth in Recovery Boilers: Effect of Flue Gas and Deposit Temperature

Modelling Fume Deposit Growth in Recovery Boilers: Effect of Flue Gas and Deposit Temperature

Technical Paper published in J-FOR* Vol.4, No1, 2014

ABSTRACT

The high ash content of black liquor causes fouling problems in the Kraft recovery boiler. The ash-forming elements condense into submicronsized fume particles in the superheater area and the boiler bank and can deposit on heat-transfer surfaces. The fume deposits can then lower heat-transfer rate, plug flue gas flow, and expose surfaces to corrosion.

This paper presents the results of a sensitivity analysis obtained using a CFD (computational fluid dynamics)-based sub-model of the formation of fume particles and deposits, showing how flue gas and deposit surface temperatures affect instantaneous fume deposit growth. The results indicate that fume deposit growth is a selflimiting process because the growth rate decreases as the deposit surface temperature increases. On the other hand, increasing the flue gas temperature increases the fume deposition rate when the element release factors are kept constant.

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AUTHORS:

 AINO LEPPÄNEN
Tampere University of Technology,
Finland
 HONGHI TRAN
Pulp & Paper Centre University of Toronto,
Toronto, ON,
Canada
ERKKI VÄLIMÄKI
Valmet Power
Finland 
ANTTI OKSANEN
Tampere University of Technology,
Finland

* J-FOR - The Journal of Science & Technology for Forest Products and Processes, is a PAPTAC's flagship publication, incorporating high-quality peer-reviewed papers dealing with the technology and science of traditional and emerging areas that are pertinent to the forest industry.

 

 
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