Towards a generic, reliable CFD modelling methodology for waste-fired grate boilers

Boštjan Rajh, Chungen Yin, Niko Samec, Matjaž Hriberšek, Matej Zadravec

Publikation: Konferencebidrag uden forlag/tidsskriftPaper uden forlag/tidsskriftForskningpeer review

Resumé

Computational Fluid Dynamics (CFD) is increasingly used in industry for detailed understanding of the combustion process and for appropriate design and optimization of Waste–to–Energy (WtE) plants. In this paper, CFD modelling of waste wood combustion in a 13 MW grate-fired boiler in a WtE plant is presented. To reduce the risk of slagging, optimize the temperature control and enhance turbulent mixing, part of the flue gas is recycled into the grate boiler. In the simulation, a 1D in–house bed model is developed to simulate the conversion of the waste wood in the fuel bed on the grate, which provides the appropriate inlet boundary condition for the freeboard 3D CFD simulation. Additionally, a refined WSGGM (weighted sum of gray gases model) of greater accuracy, completeness and applicability is proposed and implemented into the CFD model via user defined functions (UDF) to better address the impacts of the increased CO2 and H2O vapour concentrations on radiative heat transfer in the boiler. The impacts of full buoyancy on turbulence are also investigated. As a validation effort, the temperature profiles at different ports inside the furnace are measured and the experimental values are compared with the CFD results.
OriginalsprogEngelsk
Publikationsdatosep. 2015
Antal sider16
StatusUdgivet - sep. 2015
Begivenhed10th Conference on Sustainable Development of Energy, Water and Environment Systems - Dubrovnik, Kroatien
Varighed: 27 sep. 20143 okt. 2014

Konference

Konference10th Conference on Sustainable Development of Energy, Water and Environment Systems
LandKroatien
ByDubrovnik
Periode27/09/201403/10/2014

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Boilers
Computational fluid dynamics
Wood wastes
Buoyancy
Flue gases
Temperature control
Dynamic models
Furnaces
Turbulence
Vapors
Boundary conditions
Heat transfer
Computer simulation
Gases
Industry
Temperature

Emneord

    Citer dette

    Rajh, B., Yin, C., Samec, N., Hriberšek, M., & Zadravec, M. (2015). Towards a generic, reliable CFD modelling methodology for waste-fired grate boilers. Afhandling præsenteret på 10th Conference on Sustainable Development of Energy, Water and Environment Systems, Dubrovnik, Kroatien.
    Rajh, Boštjan ; Yin, Chungen ; Samec, Niko ; Hriberšek, Matjaž ; Zadravec, Matej. / Towards a generic, reliable CFD modelling methodology for waste-fired grate boilers. Afhandling præsenteret på 10th Conference on Sustainable Development of Energy, Water and Environment Systems, Dubrovnik, Kroatien.16 s.
    @conference{3b2ed3220be6421ca2169f4acbc39b96,
    title = "Towards a generic, reliable CFD modelling methodology for waste-fired grate boilers",
    abstract = "Computational Fluid Dynamics (CFD) is increasingly used in industry for detailed understanding of the combustion process and for appropriate design and optimization of Waste–to–Energy (WtE) plants. In this paper, CFD modelling of waste wood combustion in a 13 MW grate-fired boiler in a WtE plant is presented. To reduce the risk of slagging, optimize the temperature control and enhance turbulent mixing, part of the flue gas is recycled into the grate boiler. In the simulation, a 1D in–house bed model is developed to simulate the conversion of the waste wood in the fuel bed on the grate, which provides the appropriate inlet boundary condition for the freeboard 3D CFD simulation. Additionally, a refined WSGGM (weighted sum of gray gases model) of greater accuracy, completeness and applicability is proposed and implemented into the CFD model via user defined functions (UDF) to better address the impacts of the increased CO2 and H2O vapour concentrations on radiative heat transfer in the boiler. The impacts of full buoyancy on turbulence are also investigated. As a validation effort, the temperature profiles at different ports inside the furnace are measured and the experimental values are compared with the CFD results.",
    keywords = "Waste–fired grate boiler, Bed model, Radiation modelling, Computational Fluid Dynamics (CFD)",
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    Rajh, B, Yin, C, Samec, N, Hriberšek, M & Zadravec, M 2015, 'Towards a generic, reliable CFD modelling methodology for waste-fired grate boilers' Paper fremlagt ved 10th Conference on Sustainable Development of Energy, Water and Environment Systems, Dubrovnik, Kroatien, 27/09/2014 - 03/10/2014, .

    Towards a generic, reliable CFD modelling methodology for waste-fired grate boilers. / Rajh, Boštjan; Yin, Chungen; Samec, Niko; Hriberšek, Matjaž; Zadravec, Matej.

    2015. Afhandling præsenteret på 10th Conference on Sustainable Development of Energy, Water and Environment Systems, Dubrovnik, Kroatien.

    Publikation: Konferencebidrag uden forlag/tidsskriftPaper uden forlag/tidsskriftForskningpeer review

    TY - CONF

    T1 - Towards a generic, reliable CFD modelling methodology for waste-fired grate boilers

    AU - Rajh, Boštjan

    AU - Yin, Chungen

    AU - Samec, Niko

    AU - Hriberšek, Matjaž

    AU - Zadravec, Matej

    PY - 2015/9

    Y1 - 2015/9

    N2 - Computational Fluid Dynamics (CFD) is increasingly used in industry for detailed understanding of the combustion process and for appropriate design and optimization of Waste–to–Energy (WtE) plants. In this paper, CFD modelling of waste wood combustion in a 13 MW grate-fired boiler in a WtE plant is presented. To reduce the risk of slagging, optimize the temperature control and enhance turbulent mixing, part of the flue gas is recycled into the grate boiler. In the simulation, a 1D in–house bed model is developed to simulate the conversion of the waste wood in the fuel bed on the grate, which provides the appropriate inlet boundary condition for the freeboard 3D CFD simulation. Additionally, a refined WSGGM (weighted sum of gray gases model) of greater accuracy, completeness and applicability is proposed and implemented into the CFD model via user defined functions (UDF) to better address the impacts of the increased CO2 and H2O vapour concentrations on radiative heat transfer in the boiler. The impacts of full buoyancy on turbulence are also investigated. As a validation effort, the temperature profiles at different ports inside the furnace are measured and the experimental values are compared with the CFD results.

    AB - Computational Fluid Dynamics (CFD) is increasingly used in industry for detailed understanding of the combustion process and for appropriate design and optimization of Waste–to–Energy (WtE) plants. In this paper, CFD modelling of waste wood combustion in a 13 MW grate-fired boiler in a WtE plant is presented. To reduce the risk of slagging, optimize the temperature control and enhance turbulent mixing, part of the flue gas is recycled into the grate boiler. In the simulation, a 1D in–house bed model is developed to simulate the conversion of the waste wood in the fuel bed on the grate, which provides the appropriate inlet boundary condition for the freeboard 3D CFD simulation. Additionally, a refined WSGGM (weighted sum of gray gases model) of greater accuracy, completeness and applicability is proposed and implemented into the CFD model via user defined functions (UDF) to better address the impacts of the increased CO2 and H2O vapour concentrations on radiative heat transfer in the boiler. The impacts of full buoyancy on turbulence are also investigated. As a validation effort, the temperature profiles at different ports inside the furnace are measured and the experimental values are compared with the CFD results.

    KW - Waste–fired grate boiler

    KW - Bed model

    KW - Radiation modelling

    KW - Computational Fluid Dynamics (CFD)

    M3 - Paper without publisher/journal

    ER -

    Rajh B, Yin C, Samec N, Hriberšek M, Zadravec M. Towards a generic, reliable CFD modelling methodology for waste-fired grate boilers. 2015. Afhandling præsenteret på 10th Conference on Sustainable Development of Energy, Water and Environment Systems, Dubrovnik, Kroatien.