Artykuły (WIPiOŚ)

Stały URI dla kolekcjihttp://hdl.handle.net/11652/176

Przeglądaj

Filtry

20252

Ustawienia

Autorsearch.filters.applied.operator.equals: search.filters.author.Szufa, SzymonTematsearch.filters.applied.operator.equals: search.filters.subject.torrefaction

collection.search.results.head

Teraz wyświetlane 1 - 2 z 2
  • Pozycja
    Valorisation potential of black tea processing wastes for bioactive compounds recovery and renewable energy production
    (Elsevier, 2025) Ünyay, Hilal; Altay, Hatice Özmen; Perendeci, N. Altınay; Szufa, Szymon; Özdemir, Feramuz; Angelidaki, İrini; Faculty of Process and Environmental Engineering. Lodz University of Technology. Ünyay, Hilal and Szufa, Szymon.; Akdeniz University, Engineering Faculty. Food Engineering Department. Altay, Hatice Özmen.; Akdeniz University, Engineering Faculty. Environmental Engineering Department. Perendeci, N. Altınay and Ünyay, Hilal.; Department of Chemical and Biochemical Engineering, Technical University of Denmark. Perendeci, N. Altınay and Angelidaki, İrini.; Akdeniz University, Engineering Faculty. Food Engineering Department. Özdemir, Feramuz.; torrefaction
    Tea processing wastes, rich in carbohydrates—primarily cellulose and hemicellulose—and bioactive compounds such as polyphenols and caffeine, represent a valuable biomass resource that can be utilised for antioxidant extraction and energy recovery. Tea factories are assumed to produce uniform waste due to blending and accumulating residues in shared storage; however, four distinct waste types arise at different processing stages, each showcasing unique traits. Waste samples were taken directly from two different factories that produce black tea with Çaykur (nonpressed orthodox + rotorvane + pressed orthodox) and Rotorvane + CTC production methods belonging to the Turkish Tea Board, Türkiye, within three shooting periods and four black tea processing stages. Tea processing waste samples were evaluated from the point of resource recovery as bioactive compounds and energy production. Significant variations were found in total phenolic content (4.75–8.65 gGAE/100 gDM), gallic acid (0.47–0.61 %), and caffeine (1.33–2.54 %) levels among the tea wastes examined. Tea processing waste from the Çaykur method exhibited higher caffeine content. Methane production from anaerobic digestion ranged from 97.3 to 203.9 mLCH4/gVS. Under torrefaction at 285°C, the higher heating value (HHV) demonstrated a remarkable 43.9 % increase, reaching a peak HHV of 24.36 MJ/kg. Torrefaction yielded impressive energy yields of 82.3 % and 92.1 %. These findings underscore the efficacy of torrefaction at this temperature in boosting the energy content of the biomass while maintaining high energy yield percentages. This study presents the first integrative and multidimensional framework for tea waste valorisation, offering comprehensive insights into its dual-purpose utilisation by concurrently assessing bioactive compounds such as total phenolic content, polyphenolic profile, and caffeine concentration and energy potential through biogas and biochar production across different tea manufacturing techniques, waste stream types, and shooting period.
  • Pozycja
    Batch rolling-bed dryer applicability for drying biomass prior to torrefaction
    (Elsevier, 2025) Szufa, Szymon; Ünyay, Hilal; Pakowski, Zdzislaw; Piersa, Piotr; Siczek, Krzysztof; Kabaciński, Mirosław; Sobek, Szymon; Moj, Kevin; Likozar, Blaž; Kostyniuk, Andrii; Junga, Robert; Faculty of Process and Environmental Engineering. Lodz University of Technology. Szymon Szufa, Hilal Unyay, Zdzislaw Pakowski, Piotr Piersa.; Department of Vehicles and Fundamentals of Machine Design. Lodz University of Technology. Krzysztof Siczek.; Department of Thermal Engineering and Industrial Facilities. Opole University of Technology. Kabaciński, Mirosław and Junga, Robert.; Department of Heating, Ventilation, and Dust Removal Technology. Silesian University of Technology. Sobek, Szymon.; Faculty of Mechanical Engineering. Opole University of Technology. Moj, Kevin.; Department of Catalysis and Chemical Reaction Engineering. National Institute of Chemistry. Likozar, Blaž and Kostyniuk, Andrii.
    This study investigates the suitability of a pilot-scale batch rolling-bed dryer for drying pine wood chips intended for torrefaction. The batch rolling bed dryer emerges as an ideal solution for further processes like torrefaction, offering a compact design and a wide range of operational parameters. Compared to rotary dryers, it occupies less volume, providing greater efficiency. Additionally, its adjustable drying airflow and compatibility with various biomass forms and particle sizes enhance its versatility. The volumetric evaporation rate was found 13.9 kg/m3 per hour for the total dryer volume and 78.8 kg/m3 for the bed volume. Mechanical tests demonstrate satisfactory operation, with potential for further optimization through impeller blade design improvements. The study also presents a simple model using the CDC modeling approach, successfully describing drying curves in most experiments, albeit with some limitations in temperature curve simulations. Overall, the rolling bed dryer proves to be a convenient solution for drying wood chips as a pretreatment for steam torrefaction, offering ease of operation and promising potential for application in continuous torrefaction lines.