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

Fedorova, Nataliia and Aziziyanesfahani, Pegah and Jovicic, Vojislav and Zbogar-Rasic, Ana and Jehanzaib Khan, Muhammad and Delgado, Antonio (2019):
Investigation of the Concepts to Increase the Dew Point Temperature for Thermal Energy Recovery from Flue Gas, Using Aspen ®.
In: Energies, Molecular Diversity Preservation International (MDPI), pp. 1-17, 12, (1585), ISSN 1996-1073,
DOI: 10.3390/en12091585,
[Online-Edition: https://www.mdpi.com/1996-1073/12/9/1585/pdf],
[Article]

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 effciency 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-effcient and exhibiting the lowest energy cost.

Item Type: Article
Erschienen: 2019
Creators: Fedorova, Nataliia and Aziziyanesfahani, Pegah and Jovicic, Vojislav and Zbogar-Rasic, Ana and Jehanzaib Khan, Muhammad and Delgado, Antonio
Title: Investigation of the Concepts to Increase the Dew Point Temperature for Thermal Energy Recovery from Flue Gas, Using Aspen ®
Language: English
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 effciency 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-effcient and exhibiting the lowest energy cost.

Journal or Publication Title: Energies
Volume: 12
Number: 1585
Publisher: Molecular Diversity Preservation International (MDPI)
Uncontrolled Keywords: Thermal energy recovery; flue gas; dew point temperature; condensation; Aspen®
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Fachgebiet für Papierfabrikation und Mechanische Verfahrenstechnik (PMV)
Date Deposited: 05 Jul 2019 09:42
DOI: 10.3390/en12091585
Official URL: https://www.mdpi.com/1996-1073/12/9/1585/pdf
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