CFD simulation of ash deposit formation in fixed bed biomass furnaces and boilers

M. Forstner; G. Hofmeister; M. Joeller; J. Dahl; M. Braun; S. Kleditzsch; R. Scharler; I. Obernberger

doi:10.1504/PCFD.2006.010034

CFD simulation of ash deposit formation in fixed bed biomass furnaces and boilers

M. Forstner, G. Hofmeister, M. Joeller, J. Dahl, M. Braun, S. Kleditzsch, R. Scharler, I. Obernberger

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Abstract

In order to describe and predict the formation of ash deposits in biomass fired combustion plants, a mathematical model is being developed and implemented into the CFD code Fluent¿ as a post processing tool. At the present state of development the model covers the release of coarse ash particles and ash-forming vapours from the fuel bed, the transport to furnace and boiler surfaces and the deposition of particles and vapours. Changes in the flue gas composition due to chemical reactions are considered by performing thermodynamic equilibrium calculations in order to determine the gas phase composition. The build-up of the deposit layer depending on wall temperature, deposit porosity and chemical composition is also taken into account. First results of modelling deposit formation for the furnace and fire tube of a grate fired combustion unit (boiler capacity 440 kWth) show plausible results but have yet to be validated.

Original language	English
Pages (from-to)	248-261
Number of pages	14
Journal	Progress in computational fluid dynamics
Volume	6
Issue number	4-5
DOIs	https://doi.org/10.1504/PCFD.2006.010034
Publication status	Published - 2006

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title = "CFD simulation of ash deposit formation in fixed bed biomass furnaces and boilers",

abstract = "In order to describe and predict the formation of ash deposits in biomass fired combustion plants, a mathematical model is being developed and implemented into the CFD code Fluent¿ as a post processing tool. At the present state of development the model covers the release of coarse ash particles and ash-forming vapours from the fuel bed, the transport to furnace and boiler surfaces and the deposition of particles and vapours. Changes in the flue gas composition due to chemical reactions are considered by performing thermodynamic equilibrium calculations in order to determine the gas phase composition. The build-up of the deposit layer depending on wall temperature, deposit porosity and chemical composition is also taken into account. First results of modelling deposit formation for the furnace and fire tube of a grate fired combustion unit (boiler capacity 440 kWth) show plausible results but have yet to be validated.",

author = "M. Forstner and G. Hofmeister and M. Joeller and J. Dahl and M. Braun and S. Kleditzsch and R. Scharler and I. Obernberger",

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T1 - CFD simulation of ash deposit formation in fixed bed biomass furnaces and boilers

AU - Forstner, M.

AU - Hofmeister, G.

AU - Joeller, M.

AU - Dahl, J.

AU - Braun, M.

AU - Kleditzsch, S.

AU - Scharler, R.

AU - Obernberger, I.

PY - 2006

Y1 - 2006

N2 - In order to describe and predict the formation of ash deposits in biomass fired combustion plants, a mathematical model is being developed and implemented into the CFD code Fluent¿ as a post processing tool. At the present state of development the model covers the release of coarse ash particles and ash-forming vapours from the fuel bed, the transport to furnace and boiler surfaces and the deposition of particles and vapours. Changes in the flue gas composition due to chemical reactions are considered by performing thermodynamic equilibrium calculations in order to determine the gas phase composition. The build-up of the deposit layer depending on wall temperature, deposit porosity and chemical composition is also taken into account. First results of modelling deposit formation for the furnace and fire tube of a grate fired combustion unit (boiler capacity 440 kWth) show plausible results but have yet to be validated.

AB - In order to describe and predict the formation of ash deposits in biomass fired combustion plants, a mathematical model is being developed and implemented into the CFD code Fluent¿ as a post processing tool. At the present state of development the model covers the release of coarse ash particles and ash-forming vapours from the fuel bed, the transport to furnace and boiler surfaces and the deposition of particles and vapours. Changes in the flue gas composition due to chemical reactions are considered by performing thermodynamic equilibrium calculations in order to determine the gas phase composition. The build-up of the deposit layer depending on wall temperature, deposit porosity and chemical composition is also taken into account. First results of modelling deposit formation for the furnace and fire tube of a grate fired combustion unit (boiler capacity 440 kWth) show plausible results but have yet to be validated.

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DO - 10.1504/PCFD.2006.010034

M3 - Article

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VL - 6

SP - 248

EP - 261

JO - Progress in computational fluid dynamics

JF - Progress in computational fluid dynamics

IS - 4-5

ER -

CFD simulation of ash deposit formation in fixed bed biomass furnaces and boilers

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