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Numerical modeling of torrefaction reactor integrated in energy technological complex

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  • Director, L.B.
  • Sinelshchikov, V.A.

Abstract

The paper presents the calculated performances of an energy-technological complex (ETC) consisting of an electric generator based on a gas piston unit (GPU), a torrefaction reactor and a heat-recovery boiler (HRB) for incinerating torrefaction volatile products. A one-dimensional mathematical model was used to simulate the operation of the torrefaction reactor with direct heating and recirculation of the heat carrier. The heat carrier consisted of exhaust gases from the GPU and torrefaction volatile products. The reactor operated in a cycle mode with periodic unloading/loading of feedstock. It is shown that the degree of mass losses during torrefaction depends not only on the temperature but also on mass flow rate of the heat carrier at the reactor inlet. An optimal value of the mass flow rate was obtained. The reduction in the duration of the unloading/loading cycle leads to an improvement of the torrefied pellets quality and the smoothing of the fluctuations in the HRB operating parameters. Using the recirculation halves the consumption of natural gas for the production of torrefied pellets. Based on the comparative analysis of the ETC operation in cogeneration and trigeneration modes, it is shown that economic efficiency of schemes with recirculation is higher than schemes without recirculation.

Suggested Citation

  • Director, L.B. & Sinelshchikov, V.A., 2019. "Numerical modeling of torrefaction reactor integrated in energy technological complex," Energy, Elsevier, vol. 167(C), pages 1194-1204.
    • Handle: RePEc:eee:energy:v:167:y:2019:i:c:p:1194-1204
    DOI: 10.1016/j.energy.2018.11.044
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    References listed on IDEAS

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    1. Sermyagina, Ekaterina & Saari, Jussi & Zakeri, Behnam & Kaikko, Juha & Vakkilainen, Esa, 2015. "Effect of heat integration method and torrefaction temperature on the performance of an integrated CHP-torrefaction plant," Applied Energy, Elsevier, vol. 149(C), pages 24-34.
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    1. Ivanovski, Maja & Goricanec, Darko & Krope, Jurij & Urbancl, Danijela, 2022. "Torrefaction pretreatment of lignocellulosic biomass for sustainable solid biofuel production," Energy, Elsevier, vol. 240(C).
    2. Oh, Kwang Cheol & Park, Sun Young & Kim, Seok Jun & Choi, Yun Sung & Lee, Chung Geon & Cho, La Hoon & Kim, Dae Hyun, 2019. "Development and validation of mass reduction model to optimize torrefaction for agricultural byproduct biomass," Renewable Energy, Elsevier, vol. 139(C), pages 988-999.
    3. Zhang, Di & Lv, Donghui & Yin, Changfang & Liu, Guilian, 2020. "Combined pinch and mathematical programming method for coupling integration of reactor and threshold heat exchanger network," Energy, Elsevier, vol. 205(C).

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