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Investigation of the Concepts to Increase the Dew Point Temperature for Thermal Energy Recovery from Flue Gas, Using Aspen ®

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  • Nataliia Fedorova

    (Institute of Fluid Mechanics (LSTM), Friedrich-Alexander University (FAU), 91058 Erlangen, Germany
    Erlangen Graduate School in Advanced Optical Technologies (SAOT), 91054 Erlangen, Germany)

  • Pegah Aziziyanesfahani

    (Institute of Fluid Mechanics (LSTM), Friedrich-Alexander University (FAU), 91058 Erlangen, Germany)

  • Vojislav Jovicic

    (Institute of Fluid Mechanics (LSTM), Friedrich-Alexander University (FAU), 91058 Erlangen, Germany
    Erlangen Graduate School in Advanced Optical Technologies (SAOT), 91054 Erlangen, Germany)

  • Ana Zbogar-Rasic

    (Institute of Fluid Mechanics (LSTM), Friedrich-Alexander University (FAU), 91058 Erlangen, Germany)

  • Muhammad Jehanzaib Khan

    (Institute of Fluid Mechanics (LSTM), Friedrich-Alexander University (FAU), 91058 Erlangen, Germany)

  • Antonio Delgado

    (Institute of Fluid Mechanics (LSTM), Friedrich-Alexander University (FAU), 91058 Erlangen, Germany
    Erlangen Graduate School in Advanced Optical Technologies (SAOT), 91054 Erlangen, Germany)

Abstract

Thermal energy of flue gases (FG) dissipating from industrial facilities into the environment, constitute around 20% of the total dissipated thermal energy. Being part of the FG, water vapour carries thermal energy out of the system in the form of the latent heat, which can be recovered by condensation, thus increasing the overall efficiency of an industrial process. The limiting factor in this case is the low dew point temperature (usually 40–60 °C) of the water vapour in the FG. The increase of the dew point temperature can be achieved by increasing the water content or pressure. Taking these measures as a basis, the presented work investigated the following concepts for increasing the dew point temperature: humidification of the flue gas using water, humidification using steam, compression of the FG and usage of the steam ejector. Modelling of these concepts was performed using the commercial software Aspen ® . The humidification of the FG using water resulted in the negligible increase in the dew point (3 °C). Using steam humidification the temperatures of up to 92 °C were reached, while the use of steam ejector led to few degrees higher dew point temperatures. However, both concepts proved to be energy demanding, due to the energy requirements for the steam generation. The FG compression enabled the achievement of a 97 °C dew point temperature, being both energy-efficient and exhibiting the lowest energy cost.

Suggested Citation

  • Nataliia Fedorova & Pegah Aziziyanesfahani & Vojislav Jovicic & Ana Zbogar-Rasic & Muhammad Jehanzaib Khan & Antonio Delgado, 2019. "Investigation of the Concepts to Increase the Dew Point Temperature for Thermal Energy Recovery from Flue Gas, Using Aspen ®," Energies, MDPI, vol. 12(9), pages 1-17, April.
  • Handle: RePEc:gam:jeners:v:12:y:2019:i:9:p:1585-:d:226044
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    1. Wang, Haichao & Wu, Xiaozhou & Liu, Zheyi & Granlund, Katja & Lahdelma, Risto & Li, Ji & Teppo, Esa & Yu, Li & Duamu, Lin & Li, Xiangli & Haavisto, Ilkka, 2021. "Waste heat recovery mechanism for coal-fired flue gas in a counter-flow direct contact scrubber," Energy, Elsevier, vol. 237(C).
    2. Artur J. Jaworski, 2019. "Special Issue “Fluid Flow and Heat Transfer”," Energies, MDPI, vol. 12(16), pages 1-4, August.

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