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Convective drying of sewage sludge layer in through-flowLipolt, Andraž ...Drying of the sewage sludge layer was investigated in a convective laboratory dryer at air temperatures of 65 °C and 80 °C and air speeds of 0.53 m/s and 0.83 m/s. The sludge layer was formed by ... loading cylindrical extrudates on a grate of 0.5 m x 0.5 m size. The drying air was directed through the layer, as typically encountered in industrial belt dryers. Under such setup, the sludge layer structure and porosity significantly affect the air flow conditions and thus the drying rates. Shrinkage and cracking of the material during drying caused changes in the layer's porous structure, that affected the pressure drop and the drag force due to passing of air through the layer. The decreasing of drag force over time was modeled by a simple function that showed excellent agreement to the selected measured data. The sludge layer drying kinetics was determined by fitting the measured data to the most common drying models. Two models, the modified Nadhari and the Wang Singh model, were determined as most suitable for modeling of drying curves. The total drying time per kilogram of sludge was modeled as a function of drying air temperature, drying air velocity and initial sludge dry matter content. The coefficient of determination (R2) of the model is 0.944. Total drying times between 43 minutes per kilogram and 76 minutes per kilogram of sludge were obtained for the investigated range of drying air conditions.Vir: Strojniški vestnik = Journal of mechanical engineering. - ISSN 0039-2480 (Vol. 66, no. 9, Sep. 2020, str. 481-493, SI 61)Vrsta gradiva - članek, sestavni delLeto - 2020Jezik - angleškiCOBISS.SI-ID - 27998723
Avtor
Lipolt, Andraž |
Širok, Brane |
Hočevar, Marko, strojnik, 1972- |
Novak, Lovrenc, strojnik
Teme
wastewater sludge |
thin-layer drying |
porous layer |
drying kinetics |
drag force |
odpadno blato s čistilnih naprav |
sušenje v tanki plasti |
porozna plast |
sušilna kinetika |
sila upora |
modeliranje
vir: Strojniški vestnik = Journal of mechanical engineering. - ISSN 0039-2480 (Vol. 66, no. 9, Sep. 2020, str. 481-493, SI 61)
Vnos na polico
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Leto | Faktor vpliva | Izdaja | Kategorija | Razvrstitev | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
Baze podatkov, v katerih je revija indeksirana
Ime baze podatkov | Področje | Leto |
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Povezave do osebnih bibliografij avtorjev | Povezave do podatkov o raziskovalcih v sistemu SICRIS |
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Lipolt, Andraž | |
Širok, Brane | 09286 |
Hočevar, Marko, strojnik, 1972- | 18836 |
Novak, Lovrenc, strojnik | 22241 |
Vir: Osebne bibliografije
in: SICRIS
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