A cfd-method for the analysis and optimization of the fixed bed conversion in biomass grate furnaces

Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in einem KonferenzbandForschungBegutachtung

Abstract

To optimize the combustion of biomass grate furnaces a sensitivity analysis is carried out by means of CFD simulation. The methodical procedure consists of a 3D packed bed biomass combustion model, which describes the most essential characteristics of the thermal conversion of biomass particles, such as the detailed consideration of drying, pyrolysis and char oxidation in parallel processes. Within the sensitivity analysis the following parameters have been investigated: distribution of false air, residence time of fuel on the grate and distribution of recirculated flue gas and primary air below the grate. To evaluate the influence of the varied parameters on the combustion process the focus lied on the position of the thermal conversion of the biomass and the CO at the outlet of the simulation domain. The results of the sensitivity analysis show a shift of the thermal conversion towards the grate end for increased false air as well as for reduced momentum of primary air/recirculated flue gas mixture. An increase of the fuel residence time leads to a shift of the thermal conversion towards the fuel inlet. Consequently a large region of the primary combustion zone is not used due to earlier release of CO inside the fuel bed.

Originalspracheenglisch
TitelEuropean Biomass Conference and Exhibition Proceedings
Seiten688-693
Seitenumfang6
Band27
ISBN (elektronisch)978-88-89407-19-6
DOIs
PublikationsstatusVeröffentlicht - 1 Jan 2019
Veranstaltung27th European Biomass Conference and Exhibition, EUBCE 2019 - Lisbon, Portugal
Dauer: 27 Mai 201930 Mai 2019

Konferenz

Konferenz27th European Biomass Conference and Exhibition, EUBCE 2019
LandPortugal
OrtLisbon
Zeitraum27/05/1930/05/19

Fingerprint

furnaces
combustion
Biomass
Furnaces
Sensitivity analysis
sensitivity analysis
heat
air
biomass
Air
Flue gases
residence time
momentum
pyrolysis
Packed beds
methodology
Gas mixtures
simulation
Momentum
Drying

Schlagwörter

    ASJC Scopus subject areas

    • !!Agronomy and Crop Science
    • !!Forestry
    • !!Renewable Energy, Sustainability and the Environment
    • !!Waste Management and Disposal

    Dies zitieren

    A cfd-method for the analysis and optimization of the fixed bed conversion in biomass grate furnaces. / Singer, Matthias; Mehrabian, Ramin; Gruber, Thomas; Anca-Couce, Andres; Scharler, Robert.

    European Biomass Conference and Exhibition Proceedings. Band 27 2019. S. 688-693.

    Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in einem KonferenzbandForschungBegutachtung

    @inproceedings{50d1d1e818a646fabafe2ceff42537c7,
    title = "A cfd-method for the analysis and optimization of the fixed bed conversion in biomass grate furnaces",
    abstract = "To optimize the combustion of biomass grate furnaces a sensitivity analysis is carried out by means of CFD simulation. The methodical procedure consists of a 3D packed bed biomass combustion model, which describes the most essential characteristics of the thermal conversion of biomass particles, such as the detailed consideration of drying, pyrolysis and char oxidation in parallel processes. Within the sensitivity analysis the following parameters have been investigated: distribution of false air, residence time of fuel on the grate and distribution of recirculated flue gas and primary air below the grate. To evaluate the influence of the varied parameters on the combustion process the focus lied on the position of the thermal conversion of the biomass and the CO at the outlet of the simulation domain. The results of the sensitivity analysis show a shift of the thermal conversion towards the grate end for increased false air as well as for reduced momentum of primary air/recirculated flue gas mixture. An increase of the fuel residence time leads to a shift of the thermal conversion towards the fuel inlet. Consequently a large region of the primary combustion zone is not used due to earlier release of CO inside the fuel bed.",
    keywords = "CFD optimization, Combustion, Efficiency, Grate furnace",
    author = "Matthias Singer and Ramin Mehrabian and Thomas Gruber and Andres Anca-Couce and Robert Scharler",
    year = "2019",
    month = "1",
    day = "1",
    doi = "10.5071/27thEUBCE2019-2BV.4.17",
    language = "English",
    volume = "27",
    pages = "688--693",
    booktitle = "European Biomass Conference and Exhibition Proceedings",

    }

    TY - GEN

    T1 - A cfd-method for the analysis and optimization of the fixed bed conversion in biomass grate furnaces

    AU - Singer, Matthias

    AU - Mehrabian, Ramin

    AU - Gruber, Thomas

    AU - Anca-Couce, Andres

    AU - Scharler, Robert

    PY - 2019/1/1

    Y1 - 2019/1/1

    N2 - To optimize the combustion of biomass grate furnaces a sensitivity analysis is carried out by means of CFD simulation. The methodical procedure consists of a 3D packed bed biomass combustion model, which describes the most essential characteristics of the thermal conversion of biomass particles, such as the detailed consideration of drying, pyrolysis and char oxidation in parallel processes. Within the sensitivity analysis the following parameters have been investigated: distribution of false air, residence time of fuel on the grate and distribution of recirculated flue gas and primary air below the grate. To evaluate the influence of the varied parameters on the combustion process the focus lied on the position of the thermal conversion of the biomass and the CO at the outlet of the simulation domain. The results of the sensitivity analysis show a shift of the thermal conversion towards the grate end for increased false air as well as for reduced momentum of primary air/recirculated flue gas mixture. An increase of the fuel residence time leads to a shift of the thermal conversion towards the fuel inlet. Consequently a large region of the primary combustion zone is not used due to earlier release of CO inside the fuel bed.

    AB - To optimize the combustion of biomass grate furnaces a sensitivity analysis is carried out by means of CFD simulation. The methodical procedure consists of a 3D packed bed biomass combustion model, which describes the most essential characteristics of the thermal conversion of biomass particles, such as the detailed consideration of drying, pyrolysis and char oxidation in parallel processes. Within the sensitivity analysis the following parameters have been investigated: distribution of false air, residence time of fuel on the grate and distribution of recirculated flue gas and primary air below the grate. To evaluate the influence of the varied parameters on the combustion process the focus lied on the position of the thermal conversion of the biomass and the CO at the outlet of the simulation domain. The results of the sensitivity analysis show a shift of the thermal conversion towards the grate end for increased false air as well as for reduced momentum of primary air/recirculated flue gas mixture. An increase of the fuel residence time leads to a shift of the thermal conversion towards the fuel inlet. Consequently a large region of the primary combustion zone is not used due to earlier release of CO inside the fuel bed.

    KW - CFD optimization

    KW - Combustion

    KW - Efficiency

    KW - Grate furnace

    UR - http://www.scopus.com/inward/record.url?scp=85071063424&partnerID=8YFLogxK

    U2 - 10.5071/27thEUBCE2019-2BV.4.17

    DO - 10.5071/27thEUBCE2019-2BV.4.17

    M3 - Conference contribution

    VL - 27

    SP - 688

    EP - 693

    BT - European Biomass Conference and Exhibition Proceedings

    ER -