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Model of Residence Time Distribution, Degree of Mixing and Degree of Dispersion in the Biomass Transport Process on Various Grate Systems

Author

Listed:
  • Tomasz Jaworski

    (Department of Technologies and Installations for Waste Management, Silesian University of Technology, Konarskiego 18, 44-100 Gliwice, Poland)

  • Agata Wajda

    (Institute of Energy and Fuel Processing Technology, Zamkowa 1, 41-803 Zabrze, Poland)

  • Łukasz Kus

    (Joint Doctoral School, Silesian University of Technology, Akademicka 2A, 44-100 Gliwice, Poland)

Abstract

Biomass includes diverse raw materials of plant or animal origin that are biodegradable. It also constitutes a significant fraction of municipal waste burned in waste incineration plants. Grate technology is one of the more commonly used technologies in the thermal conversion of biomass. The mass transport of material on the grate is a complex issue. The article presents a model for determining selected mass flow parameters on the grate, primarily the distribution of residence time, degree of mixing, and dispersion. The model is a description of mechanical mass transport on the grates of thermal waste conversion devices and represents the kinetics of the processes occurring on the grate. It allows for the design of the details of the specific movement of the material particles on the grates depending on their size and density. In addition, experimental tests of flow parameters realized on a laboratory stand simulating the operation of the grate are presented. Tests were conducted on different types of grates and with selected types of biomass materials. They included variants of the operating parameters of the grates, such as the speed and pitch of the grates an their inclination, simultaneously with the fulfillment of the 1:1 scale condition of the size of the laboratory stand to the actual size of the industrial grate (its section). A general trend can be seen in the mean residence time of the material on the grate, which is higher in the case of a reciprocating grate. The degree of dispersion is mainly influenced for moving and reciprocating grates by the inclination angle of the grate. The analysis of the test results made it possible to clarify the mechanism of material mass transport on different types of grates. It is also proposed to use the results in modeling the process of biomass combustion in grate chambers as well as their design and operation.

Suggested Citation

  • Tomasz Jaworski & Agata Wajda & Łukasz Kus, 2023. "Model of Residence Time Distribution, Degree of Mixing and Degree of Dispersion in the Biomass Transport Process on Various Grate Systems," Energies, MDPI, vol. 16(15), pages 1-22, July.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:15:p:5672-:d:1204903
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    References listed on IDEAS

    as
    1. Michał Kozioł & Joachim Kozioł, 2023. "Impact of Primary Air Separation in a Grate Furnace on the Resulting Combustion Products," Energies, MDPI, vol. 16(4), pages 1-16, February.
    2. Mingtao Jiang & Adrian C. H. Lai & Adrian Wing-Keung Law, 2020. "Solid Waste Incineration Modelling for Advanced Moving Grate Incinerators," Sustainability, MDPI, vol. 12(19), pages 1-15, September.
    Full references (including those not matched with items on IDEAS)

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