Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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Author: search.filters.author.Yıldız, GürayHas files: No

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  • Article
    Citation - WoS: 30
    Citation - Scopus: 35
    Fast Pyrolysis With Fractional Condensation of Lignin-Rich Digested Stillage From Second-Generation Bioethanol Production
    (Elsevier Ltd., 2020) Priharto, Neil; Ronsse, Frederik; Yıldız, Güray; Heeres, Hero Jan; Deuss, Peter J.; Prins, Wolter
    Poplar-derived lignin-rich feedstock (i.e. stillage) obtained from bioethanol production was subjected to fast pyrolysis in a modified fluidised bed reactor at 430 degrees C, 480 degrees C, and 530 degrees C. The stillage was pretreated by enzymatic digestion prior to fast pyrolysis. Pyrolysis vapors were collected by fractional condensation to separate the heavy organic and aqueous phase liquids. The intention of this study was to assess the potential utilization of lignin-rich digested stillage as a fast pyrolysis feedstock. Heavy organic and aqueous phase pyrolysis liquids were obtained in yields ranging from 15.1-18.1 wt.% and 9.7-13.4 wt.% respectively. The rest of the feedstock material was converted to char (37.1-44.7 wt.%) and non-condensable gases (27.1-31.5 wt.%). Detailed liquid analysis indicated that the heavy organic phase fractions contain compounds arising from the degradation of lignin, residual microbial biomass and remaining polysaccharides. Fast pyrolysis adds 26.8 wt.% to the conversion of this otherwise recalcitrant feedstock material, thereby reducing waste generation and enhancing the value of second-generation bioethanol production.
  • Article
    Citation - WoS: 27
    Citation - Scopus: 29
    The Utilization of Plum Stones for Pellet Production and Investigation of Post-Combustion Flue Gas Emissions
    (MDPI, 2020) Dolzynska, Magdalena; Obidzinski, Slawomir; Piekut, Jolanta; Yıldız, Güray
    Agri-food waste is generated at various food cycle stages and is considered to be a valuable feedstock in energy systems and chemical syntheses. This research identifies the potential and suitability of a representative agri-food waste sample (i.e., plum stones) as a solid fuel. Ground plum stones containing 10, 15, and 20 wt.% of rye bran were subjected to pelletization. The pelletizer was operated at 170, 220, and 270 rpm, and its power demand for the mixture containing 20 wt.% of rye bran was 1.81, 1.89, and 2.21 kW, respectively. Such pellets had the highest quality in terms of their density (814.6 kg.m(-3)), kinetic durability (87.8%), lower heating value (20.04 MJ.kg(-1)), and elemental composition (C: 54.1 wt.%; H: 6.4 wt.%; N: 0.73 wt.%; S: 0.103 wt.%; Cl: 0.002 wt.%; O: 38.2 wt.%). Whole plum stones and pellets were subjected to combustion in a 25 kW retort grate boiler in order to determine the changes in the concentrations of NO, SO2, CO, CO2, HCl, and O-2 in the post-combustion flue gas. Collected results indicate that plum stone-rye bran pellets can serve as effective substitutes for wood pellets in prosumer installations, meeting the Ecodesign Directive requirements for CO and NO.