COMPUTATIONAL FLUID DYNAMIC MODELING OF COMBUSTION AND ASH DEPOSITION IN A BIOMASS-COFIRED BUBBLING FLUIDIZED BED BOILER

International Journal of Energy for a Clean Environment

FORMERLY KNOWN AS CLEAN AIR: INTERNATIONAL JOURNAL ON ENERGY FOR A CLEAN ENVIRONMENT

ISSN: 2150-3621 Print

ISSN: 2150-363X Online


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Year 2007, Volume 8 / Issue 2

DOI: 10.1615/InterJEnerCleanEnv.v8.i2

Pages: 89

DOI: 10.1615/InterJEnerCleanEnv.v8.i2.50

Article price - $35.00

COMPUTATIONAL FLUID DYNAMIC MODELING OF COMBUSTION AND ASH DEPOSITION IN A BIOMASS-COFIRED BUBBLING FLUIDIZED BED BOILER

Dan Lundmark
Åbo Akademi Process Chemistry Centre, Biskopsgatan 8, FI-20500 Åbo, Finland

Christian Mueller
Åbo Akademi Process Chemistry Centre, Biskopsgatan 8, FI-20500 Åbo, Finland

Bengt-Johan Skrifvars
Åbo Akademi Process Chemistry Centre, Biskopsgatan 8, FI-20500 Åbo, Finland

Mikko Hupa
ABO Akademi University, Department of Chemical Engineering, Lemmlnkaisenkatu 14-18 В FIN-20520 Turku, Finland

ABSTRACT

Biomass mixtures currently used in heat and power production are, despite their environmental and economical advantages, also combined with ash-related operational problems, such as slagging, fouling, and corrosion. To improve boiler efficiency, reliable ash deposition prediction is essential. In this work a computational fluid dynamic-based ash behavior prediction tool is used to model combustion and ash deposition tendencies in a 295-MW_t bubbling fluidized bed combustor fired with mixtures of peat and forest residue. Special focus is put on new modeling approaches for fuel distribution and the bubbling bed. The overall simulation results show good agreement with the conditions found experimentally in the boiler.

pages 155-169