A novel concept of enhanced direct-contact condensation of vapour- inert gas mixture in a spray ejector condenser

Dariusz Mikielewicz; Milad Amiri; Michał Klugmann; Jaroslaw Mikielewicz

doi:10.1016/j.ijheatmasstransfer.2023.124576

A novel concept of enhanced direct-contact condensation of vapour- inert gas mixture in a spray ejector condenser

Abstract

An analytical model of direct steam condensation (DCC) in the novel idea of spray ejector condenser (SEC) in the presence of inert gas has been developed. It is based on continuity, momentum and energy equations for the steam-carbon dioxide mixture and direct contact condensation mechanisms due to heat transfer and concentration. Crucial in the process of DCC is atomisation of the motive fluid in the ejector. The effect of atomised droplet size is exhibiting a significant amplification influence with increasing size of the droplet. Motive fluid is driving the secondary fluid-mixture of steam and inert gas in the Venturi nozzle and is cold enough to cause direct condensation. The intensity of heat transfer process from steam to water when the phases are in direct contact is much higher than the heat transfer intensity in surface heat exchangers. The analytical model pertains to a subcritical flow of a mixture of steam and gas in SEC. The model exhibits satisfactory agreement with experimental data. The model of DCC predicts higher values of temperature drop between inlet and outlet from the mixing section for the case of smaller steam-CO2 flow rates. Increasing the flow rate of steam mixture from 1.2 g/s to 3.6 g/s results in a reduction of steam mixture temperature from 25 ◦C to 14 ◦C respectively, at CO2 flow rate of 6.8 m3 /h. Condensation without presence of CO2 in the same range of steam flow rate, i.e. from 1.2 g/s to 3.6 g/s results in reduction of steam mixture temperature from 56 ◦C to 25 ◦C respectively, confirming in such way the effect of CO2 presence on the efficiency of DCC. Such model allow for discussion of parameters affecting process of condensation in SEC and ability of application such condenser in power plants.

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Authors (4)

Dariusz Mikielewicz prof. dr hab. inż.
- Faculty of Mechanical Engineering and Ship Technology
- Gdańsk University of Technology
Milad Amiri mgr
Michał Klugmann dr hab. inż.
Jaroslaw Mikielewicz Prof

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Keywords

SPRAY EJECTOR CONDENSER DIRECT-CONTACT CONDENSATION JET BREAKUP

Details

Category:

Articles

Type:

artykuły w czasopismach

Published in:

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER no. 216,
ISSN: 0017-9310

Language:

English

Publication year:

2023

Bibliographic description:

Mikielewicz D., Amiri M., Klugmann M., Mikielewicz J.: A novel concept of enhanced direct-contact condensation of vapour- inert gas mixture in a spray ejector condenser// INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER -Vol. 216, (2023), s.124576-

DOI: