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

Johanna Nieminen; Cyril Bajamundi

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 proceeding › Conference article in proceedings › Scientific

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 language	English
Title of host publication	Proceedings of the Nordic Flame Days 2015
Publisher	International Flame Research Foundation IFRF
Publication status	Published - 2015
MoE publication type	B3 Non-refereed article in conference proceedings
Event	Nordic Flame Days 2015 - Copenhagen, Denmark Duration: 6 Oct 2015 → 7 Oct 2015

Conference

Conference	Nordic Flame Days 2015
Country	Denmark
City	Copenhagen
Period	6/10/15 → 7/10/15

Keywords

combustion
CFD
slagging
fouling
corrosion

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Cite this

@inproceedings{b3563c777c0541cbae6b71d359bbb9c1,

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

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.",

keywords = "combustion, CFD, slagging, fouling, corrosion",

author = "Johanna Nieminen and Cyril Bajamundi",

note = "Project : 102026 ; Nordic Flame Days 2015 ; Conference date: 06-10-2015 Through 07-10-2015",

year = "2015",

language = "English",

booktitle = "Proceedings of the Nordic Flame Days 2015",

publisher = "International Flame Research Foundation IFRF",

address = "United Kingdom",

}

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

T2 - Nordic Flame Days 2015

Y2 - 6 October 2015 through 7 October 2015

ER -