Naslov
Mass Transfer Modelling in Spray Droplets Absorption for Wet flue Gas Desulfurization application

Autori
Grinišin, Nazar ; Bešenić, Tibor ; Kozarac, Darko ; Wang, Jin ; Vujanović, Milan

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Digital Proceedings of 16th Conference on Sustainable Development of Energy, Water and Environment Systems - SDEWES / Ban, Marko et al. - Zagreb : Fakultet strojarstva i brodogradnje Sveučilišta u Zagrebu, 2021

Skup
16th Conference on Sustainable Development of Energy, Water and Environment Systems (SDEWES)

Mjesto i datum
Dubrovnik, Hrvatska, 10.10.2021. - 15.10.2021

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Sulfur dioxide ; spray ; mass transfer ; seawater absorption ; scrubber

Sažetak
The operation of fossil fuel-powered machines is always associated with emissions of harmful pollutants. The regulations regarding allowed emission levels are becoming more and more stringent, promoting the development of new technologies. Lowering the emissions of sulfur oxides is usually done by the wet flue gas desulfurization process, which is achieved in scrubbers, where absorbing liquid is dispersed onto the exhaust gasses. This approach has gained traction in the maritime sector, where large amounts of sulfur-containing fuel are burned. Additionally, the seawater can be used as an inexpensive scrubbing liquid and reduce pollutant emissions. In this paper, modeling of the absorption dynamics was presented and the influence of freshwater and seawater on desulfurization efficiency was investigated. The absorption dynamics depends on the chemical reactions and mass transfer from flue gasses to water droplets due to the concentration differences. The usual approach for mass transfer modeling is the two-film theory, which divides mass transfer into gas and liquid side coefficients, the latter being more significant for the wet scrubbing cases. In this work, a new model for the liquid side mass transfer coefficient was investigated and implemented into the computational fluid dynamics software AVL FIRE™, first only for a droplet and then also for the entire 3D water spray. The Euler-Lagrangian approach was used to couple the dynamics of the liquid and gaseous phases. The new model considers additional parameters such as surface renewal rate, Reynolds number, and droplet diameter, compared to a single parameter of contact time in the robust penetration theory. The desulfurization efficiency results were compared with the experimental data and the results by previously-used penetration theory for liquid-side mass transfer coefficient. Additionally, the influence of parameters such as water and gas flow, sulfur dioxide concentration, droplet size and distribution on the desulfurization efficiency was calculated by the newly-implemented model. The results obtained by the new model showed the expected trend of increased efficiency with the water flow increase, as well as greater sensitivity to operational conditions in different cases and more accurately replicated removal efficiencies compared to the previously-used model.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA