izpis_h1_title_alt

Effects of layer inhomogeneities on the process of sewage sludge convective drying
ID Novak, Lovrenc (Avtor), ID Širok, Brane (Avtor), ID Zupanc, Mojca (Avtor), ID Hočevar, Marko (Avtor)

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Izvleček
Convective sewage sludge drying is often carried out in belt dryers, where the air flow is directed through the layer. In such a configuration, drying air properties, as well as the structure of the layer and its homogeneity are key factors affecting the drying process. In the present work, these factors were investigated using laboratory experiments on relatively large sludge samples with a mass of several kilograms. Drying was performed at relatively low drying air parameters (time-averaged temperatures of 65 to 80 °C and velocities of 0.44 to 0.78 m/s). The inhomogeneity of the sludge layer drying was observed by measuring the layer surface temperature with an IR camera. The reduction in layer thickness during drying was measured using an optical laser-based method. Analysis of the data included regression and fitting of the data to parametric drying curves, with the modified Nadhari drying law providing the best fit. The standard deviation of the layer surface thermograms (S) was used as a parameter that accounted for the layer homogeneity and consequently drying evenness. Higher values of S corresponded to lower drying rates and consequently longer drying times, highlighting the importance of producing layers with a homogenous structure. The measured layer thickness reduction rate indicated the overall drying intensity almost from the beginning of drying. Both the surface temperature unevenness and the layer height reduction measurement methods were demonstrated as viable approaches for real-time monitoring of the drying process with potential for application in real-scale dryers.

Jezik:Angleški jezik
Ključne besede:wastewater sludge, porous layer, drying kinetics, shrinkage, thermography
Vrsta gradiva:Članek v reviji
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FS - Fakulteta za strojništvo
Status publikacije:Objavljeno
Različica publikacije:Objavljena publikacija
Leto izida:2024
Št. strani:Str. 34-47
Številčenje:Vol. 42, no. 1
PID:20.500.12556/RUL-153474 Povezava se odpre v novem oknu
UDK:628.336.4:66.047
ISSN pri članku:0737-3937
DOI:10.1080/07373937.2023.2259974 Povezava se odpre v novem oknu
COBISS.SI-ID:166496771 Povezava se odpre v novem oknu
Datum objave v RUL:09.01.2024
Število ogledov:234
Število prenosov:23
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Gradivo je del revije

Naslov:Drying technology
Skrajšan naslov:Dry. technol.
Založnik:Taylor & Francis
ISSN:0737-3937
COBISS.SI-ID:5922823 Povezava se odpre v novem oknu

Licence

Licenca:CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by/4.0/deed.sl
Opis:To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:blato čistilnih naprav, porozna plast, kinetika sušenja, krčenje, termografija

Projekti

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:P2-0401
Naslov:Energetsko strojništvo

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