THEORETICAL AND EXPERIMENTAL STUDY OF WATER VAPOUR CONDENSATION WITH HIGH CONTENT OF NON-CONDENSABLE GAS IN A VERTICAL TUBE

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F22%3A00363712" target="_blank" >RIV/68407700:21220/22:00363712 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.14311/AP.2022.62.0352" target="_blank" >https://doi.org/10.14311/AP.2022.62.0352</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.14311/AP.2022.62.0352" target="_blank" >10.14311/AP.2022.62.0352</a>

Result language

angličtina

Original language name

THEORETICAL AND EXPERIMENTAL STUDY OF WATER VAPOUR CONDENSATION WITH HIGH CONTENT OF NON-CONDENSABLE GAS IN A VERTICAL TUBE

Original language description

This article deals with the possibility of separating water vapour from flue gases after oxyfuel combustion using condensation processes. Those processes can generally be described as condensation of water vapour in the presence of non-condensable gases. Hence, the effect of noncondensable gas (NCG) on the condensation process has been theoretically and experimentally analysed in this study. The theoretical model was developed on the basis of the heat and mass transfer analogy with respect to the effect of the NCG, the flow mode of the condensate film, the shear stress of the flowing mixture, subcooling and superheating. Subsequently, an experimental analysis was carried out on a 1.5 m long vertical pipe with an inner diameter of 23.7mm. The mixture of vapour and air flowed inside the inner tube with an air mass fraction ranging from 23 % to 62 %. The overall heat transfer coefficients (HTC) from the theoretical model and experimental measurement are significantly lower than the HTC obtained according to the Nusselt theory for the condensation of pure water vapour. The overall HTC decreases along the tube length as the gas concentration increases, which corresponds to a decrease in the local condensation rate. The highest values of the HTC are observed in the condenser inlet, although a strong decrease in HTC is also observed here. Meanwhile, there is a possibility for an HTC enhancement through turbulence increase of the condensing mixture in the condenser outlet. Results also showed that the heat resistance of the mixture is several times higher than the heat resistance of the condensate film. The developed theoretical model based on heat and mass transfer analogy is in good agreement with experimental results with the standard deviation within +25 % and -5%. The model is more accurate for lower NCG concentrations.

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

—

OECD FORD branch

20301 - Mechanical engineering

Project

<a href="/en/project/EF16_019%2F0000753" target="_blank" >EF16_019/0000753: Research centre for low-carbon energy technologies</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Acta Polytechnica

ISSN

1210-2709

e-ISSN

1805-2363

Volume of the periodical

62

Issue of the periodical within the volume

3

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

9

Pages from-to

352-360

UT code for WoS article

000828107300003

EID of the result in the Scopus database

2-s2.0-85134351266