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CFD Steady Model Applied to a Biomass Boiler Operating in Air Enrichment Conditions

Author

Listed:
  • Miguel Ángel Gómez

    (Defense University Center, Spanish Naval Academy, Plaza de España s/n 36900 Marín, Spain)

  • Rubén Martín

    (Industrial Engineering School, University of Vigo, Lagoas-Marcosende s/n 36310 Vigo, Spain)

  • Joaquín Collazo

    (Industrial Engineering School, University of Vigo, Lagoas-Marcosende s/n 36310 Vigo, Spain)

  • Jacobo Porteiro

    (Industrial Engineering School, University of Vigo, Lagoas-Marcosende s/n 36310 Vigo, Spain)

Abstract

A numerical model is proposed to perform CFD simulations of biomass boilers working in different operating conditions and analyse the results with low computational effort. The model is based on steady fluxes that represent the biomass thermal conversion stages through the conservation of mass, energy, and chemical species in the packed bed region. The conversion reactions are combined with heat and mass transfer submodels that release the combustion products to the gas flow. The gas flow is calculated through classical finite volume techniques to model the transport and reaction phenomena. The overall process is calculated in a steady state with a fast, efficient, and reasonably accurate method, which allows the results to converge without long computation times. The modelling is applied to the simulation of a 30 kW domestic boiler, and the results are compared with experimental tests with reasonably good results for such a simple model. The model is also applied to study the effect of air enrichment in boiler performance and gas emissions. The boiler operation is simulated using different oxygen concentrations that range from 21% to 90% in the feeding air, and parameters such as the heat transferred, fume temperatures, and emissions of CO, CO 2 , and NO x are analysed. The results show that with a moderated air enrichment of 40% oxygen, the energy performance can be increased by 8%, CO emissions are noticeably reduced, and NO x remains practically stable.

Suggested Citation

  • Miguel Ángel Gómez & Rubén Martín & Joaquín Collazo & Jacobo Porteiro, 2018. "CFD Steady Model Applied to a Biomass Boiler Operating in Air Enrichment Conditions," Energies, MDPI, vol. 11(10), pages 1-18, September.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:10:p:2513-:d:171257
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    References listed on IDEAS

    as
    1. Li Yang & Fang Liu & Zhengchang Song & Kunlei Liu & Kozo Saito, 2018. "3D Numerical Study of Multiphase Counter-Current Flow within a Packed Bed for Post Combustion Carbon Dioxide Capture," Energies, MDPI, vol. 11(6), pages 1-14, June.
    2. Yu, Zhaosheng & Ma, Xiaoqian & Liao, Yanfen, 2010. "Mathematical modeling of combustion in a grate-fired boiler burning straw and effect of operating conditions under air- and oxygen-enriched atmospheres," Renewable Energy, Elsevier, vol. 35(5), pages 895-903.
    3. Gyujin Kim & Sunyoung Moon & Seungha Lee & Kyoungdoug Min, 2017. "Numerical Analysis of the Combustion and Emission Characteristics of Diesel Engines with Multiple Injection Strategies Using a Modified 2-D Flamelet Model," Energies, MDPI, vol. 10(9), pages 1-17, August.
    4. Carmelina Abagnale & Maria Cristina Cameretti & Roberta De Robbio & Raffaele Tuccillo, 2017. "Thermal Cycle and Combustion Analysis of a Solar-Assisted Micro Gas Turbine," Energies, MDPI, vol. 10(6), pages 1-21, June.
    5. Khodaei, Hassan & Al-Abdeli, Yasir M. & Guzzomi, Ferdinando & Yeoh, Guan H., 2015. "An overview of processes and considerations in the modelling of fixed-bed biomass combustion," Energy, Elsevier, vol. 88(C), pages 946-972.
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    Cited by:

    1. Maulana G. Nugraha & Harwin Saptoadi & Muslikhin Hidayat & Bengt Andersson & Ronnie Andersson, 2021. "Particulate Matter Reduction in Residual Biomass Combustion," Energies, MDPI, vol. 14(11), pages 1-23, June.
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    3. Hang Yin & Yingai Jin & Liang Li & Wenbo Lv, 2022. "Numerical Investigation on the Impact of Exergy Analysis and Structural Improvement in Power Plant Boiler through Co-Simulation," Energies, MDPI, vol. 15(21), pages 1-19, October.

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