Modelling the behaviour of ash in a BFB boiler by combining CFD and thermodynamic equilibrium calculations

Johanna Nieminen, Cyril Bajamundi

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

Inorganic compounds from molten and vaporised ash in biomass combustion can cause slagging, fouling and corrosion in the boiler. In this study, the behaviour of ash is modelled by combining CFD and thermodynamic equilibrium calculations. This was done by linking the CFD code Ansys Fluent and the thermodynamic phase equilibrium calculation code ChemApp. Two test cases were calculated: a BFB boiler of 107 MWth burning bark and the same boiler burning a mixture of bark and sludge. The model was used to predict vaporisation, melting, gas phase reactions and condensation of the ash in the boiler. In the test cases, the model predicted a risk of slagging as well as fouling and corrosion for bark, while during the co-combustion of bark and sludge the risks were predicted to be somewhat lower.
Original languageEnglish
Title of host publicationProceedings of the Nordic Flame Days 2015
PublisherInternational Flame Research Foundation IFRF
Publication statusPublished - 2015
MoE publication typeB3 Non-refereed article in conference proceedings
EventNordic Flame Days 2015 - Copenhagen, Denmark
Duration: 6 Oct 20157 Oct 2015

Conference

ConferenceNordic Flame Days 2015
CountryDenmark
CityCopenhagen
Period6/10/157/10/15

Fingerprint

bark
ash
thermodynamics
fouling
modeling
corrosion
combustion
sludge
gas phase reaction
inorganic compound
vaporization
phase equilibrium
condensation
melting
boiler
calculation
biomass
code
test

Keywords

  • combustion
  • CFD
  • slagging
  • fouling
  • corrosion

Cite this

Nieminen, J., & Bajamundi, C. (2015). Modelling the behaviour of ash in a BFB boiler by combining CFD and thermodynamic equilibrium calculations. In Proceedings of the Nordic Flame Days 2015 International Flame Research Foundation IFRF.
Nieminen, Johanna ; Bajamundi, Cyril. / Modelling the behaviour of ash in a BFB boiler by combining CFD and thermodynamic equilibrium calculations. Proceedings of the Nordic Flame Days 2015. International Flame Research Foundation IFRF, 2015.
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abstract = "Inorganic compounds from molten and vaporised ash in biomass combustion can cause slagging, fouling and corrosion in the boiler. In this study, the behaviour of ash is modelled by combining CFD and thermodynamic equilibrium calculations. This was done by linking the CFD code Ansys Fluent and the thermodynamic phase equilibrium calculation code ChemApp. Two test cases were calculated: a BFB boiler of 107 MWth burning bark and the same boiler burning a mixture of bark and sludge. The model was used to predict vaporisation, melting, gas phase reactions and condensation of the ash in the boiler. In the test cases, the model predicted a risk of slagging as well as fouling and corrosion for bark, while during the co-combustion of bark and sludge the risks were predicted to be somewhat lower.",
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Nieminen, J & Bajamundi, C 2015, Modelling the behaviour of ash in a BFB boiler by combining CFD and thermodynamic equilibrium calculations. in Proceedings of the Nordic Flame Days 2015. International Flame Research Foundation IFRF, Nordic Flame Days 2015, Copenhagen, Denmark, 6/10/15.

Modelling the behaviour of ash in a BFB boiler by combining CFD and thermodynamic equilibrium calculations. / Nieminen, Johanna; Bajamundi, Cyril.

Proceedings of the Nordic Flame Days 2015. International Flame Research Foundation IFRF, 2015.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

TY - GEN

T1 - Modelling the behaviour of ash in a BFB boiler by combining CFD and thermodynamic equilibrium calculations

AU - Nieminen, Johanna

AU - Bajamundi, Cyril

N1 - Project : 102026

PY - 2015

Y1 - 2015

N2 - Inorganic compounds from molten and vaporised ash in biomass combustion can cause slagging, fouling and corrosion in the boiler. In this study, the behaviour of ash is modelled by combining CFD and thermodynamic equilibrium calculations. This was done by linking the CFD code Ansys Fluent and the thermodynamic phase equilibrium calculation code ChemApp. Two test cases were calculated: a BFB boiler of 107 MWth burning bark and the same boiler burning a mixture of bark and sludge. The model was used to predict vaporisation, melting, gas phase reactions and condensation of the ash in the boiler. In the test cases, the model predicted a risk of slagging as well as fouling and corrosion for bark, while during the co-combustion of bark and sludge the risks were predicted to be somewhat lower.

AB - Inorganic compounds from molten and vaporised ash in biomass combustion can cause slagging, fouling and corrosion in the boiler. In this study, the behaviour of ash is modelled by combining CFD and thermodynamic equilibrium calculations. This was done by linking the CFD code Ansys Fluent and the thermodynamic phase equilibrium calculation code ChemApp. Two test cases were calculated: a BFB boiler of 107 MWth burning bark and the same boiler burning a mixture of bark and sludge. The model was used to predict vaporisation, melting, gas phase reactions and condensation of the ash in the boiler. In the test cases, the model predicted a risk of slagging as well as fouling and corrosion for bark, while during the co-combustion of bark and sludge the risks were predicted to be somewhat lower.

KW - combustion

KW - CFD

KW - slagging

KW - fouling

KW - corrosion

M3 - Conference article in proceedings

BT - Proceedings of the Nordic Flame Days 2015

PB - International Flame Research Foundation IFRF

ER -

Nieminen J, Bajamundi C. Modelling the behaviour of ash in a BFB boiler by combining CFD and thermodynamic equilibrium calculations. In Proceedings of the Nordic Flame Days 2015. International Flame Research Foundation IFRF. 2015