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The Non-Stationary Heat Transport inside a Shafted Screw Conveyor Filled with Homogeneous Biomass Heated Electrically

Author

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  • Stanisław Ledakowicz

    (Faculty of Process and Environmental Engineering, Lodz University of Technology, Wolczanska Str. 215, 90-924 Lodz, Poland)

  • Olexa Piddubniak

    (Institute of Computer Technologies, Automation and Metrology, Lviv Polytechnic National University, Kniazia Romana Str. 1/3, 79005 Lviv, Ukraine)

Abstract

The non-stationary heat transfer inside a cylindrical channel of a shafted screw conveyor, electrically heated, and filled with a moving biomass was analyzed. The problem of non-stationary heat transport is encountered in the processes of biomass pyrolysis and food products’ sterilization. To solve the heat conduction equation with initial and boundary conditions, the methods of the expansion of the given and unknown functions into a Fourier series in the angular coordinate, and Fourier and Laplace integral transforms in the axial coordinate and time, respectively, were used. As a result of solving this problem, it is shown that the temperature in the reactor consists of two main terms. The first of them is proportional to time, and the second is a superposition of quasi-monochromatic heat pulses decaying with time. Numerical analysis of the temperature distribution in space and time depending on various specific parameters of the system was carried out. The obtained numerical results were compared with those corresponding to the cases of heat sources in the form of a spiral or a shaftless helical screw.

Suggested Citation

  • Stanisław Ledakowicz & Olexa Piddubniak, 2022. "The Non-Stationary Heat Transport inside a Shafted Screw Conveyor Filled with Homogeneous Biomass Heated Electrically," Energies, MDPI, vol. 15(17), pages 1-16, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:17:p:6164-:d:897106
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    References listed on IDEAS

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    1. Codignole Luz, Fàbio & Cordiner, Stefano & Manni, Alessandro & Mulone, Vincenzo & Rocco, Vittorio, 2018. "Biomass fast pyrolysis in a shaftless screw reactor: A 1-D numerical model," Energy, Elsevier, vol. 157(C), pages 792-805.
    2. Campuzano, Felipe & Brown, Robert C. & Martínez, Juan Daniel, 2019. "Auger reactors for pyrolysis of biomass and wastes," Renewable and Sustainable Energy Reviews, Elsevier, vol. 102(C), pages 372-409.
    3. Shi, Xiaogang & Ronsse, Frederik & Roegiers, Jelle & Pieters, Jan G., 2019. "3D Eulerian-Eulerian modeling of a screw reactor for biomass thermochemical conversion. Part 1: Solids flow dynamics and back-mixing," Renewable Energy, Elsevier, vol. 143(C), pages 1465-1476.
    4. Piotr Piersa & Hilal Unyay & Szymon Szufa & Wiktoria Lewandowska & Remigiusz Modrzewski & Radosław Ślężak & Stanisław Ledakowicz, 2022. "An Extensive Review and Comparison of Modern Biomass Torrefaction Reactors vs. Biomass Pyrolysis—Part 1," Energies, MDPI, vol. 15(6), pages 1-34, March.
    5. Shi, Xiaogang & Ronsse, Frederik & Nachenius, Robert & Pieters, Jan G., 2019. "3D Eulerian-Eulerian modeling of a screw reactor for biomass thermochemical conversion. Part 2: Slow pyrolysis for char production," Renewable Energy, Elsevier, vol. 143(C), pages 1477-1487.
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    1. Stanisław Ledakowicz & Olexa Piddubniak, 2023. "Temperature Distribution in a Finite-Length Cylindrical Channel Filled with Biomass Transported by Electrically Heated Auger," Energies, MDPI, vol. 16(17), pages 1-23, August.
    2. Radoslaw Slezak & Hilal Unyay & Szymon Szufa & Stanislaw Ledakowicz, 2023. "An Extensive Review and Comparison of Modern Biomass Reactors Torrefaction vs. Biomass Pyrolizers—Part 2," Energies, MDPI, vol. 16(5), pages 1-25, February.

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