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• W4200503711 endingPage "122955" @default.
• W4200503711 startingPage "122955" @default.
• W4200503711 abstract "• Low ash yield and high calorific value were demonstrated for BSGs. • Thermo-oxidative decomposition of BSGs comprised two main stages. • The apparent Ea for these stages was 190–200 and 100–150 kJ·mol −1 . • Stage I involved random nucleation and Stage II, 3D diffusion models. • BSGs can be pelletised and used as fuel in incineration plants above 500 °C. The high global generation of wastes and side streams from agri-food production has led to environmental impact and causes nature degradation due to their uncontrolled management. These wastes are profitable materials with significant economic value that could otherwise be exploited as new sources in the feed industry or the production of bioenergy. Among them, brewer’s spent grain (BSG) is a solid by-product generated in the beer-brewing process that consists of the barley grain husks together with parts of the pericarp and seed coat layer. Although it is rich in fibres and proteins, its main use is currently limited to animal feed or simply deposition to landfills. This study pursues the evaluation of BSGs as biofuels in energy recovery processes. For this purpose, the elemental composition, the higher heating value, the content of volatiles, fixed carbon, moisture, and ash yield along with the kinetic analysis of its decomposition during thermo-oxidative combustion were assessed. The thermo-oxidative decomposition of hemicellulose, cellulose, lignin, and char occurred in two main stages. The average apparent activation energy for Stage I was 190–200 kJ·mol −1 , significantly higher than that of Stage II (100–150 kJ·mol −1 ). Stage I revealed a random nucleation kinetic model ( F n ) and involved the volatilisation of hemicellulose and cellulose and partially lignin. Stage II, described by a three-dimensional diffusion kinetic model ( D 4 ), comprised the completion of lignin and the decomposition of char. The environmental advantage of using such residues was demonstrated with the low ash yield (in the range of 1.7–5.4%) and high calorific value between 17.8 and 19.1 MJ·kg −1 . The obtained results serve as the baseline for describing the energy recovery process in a reactor that uses BSG residues as feedstock under oxidative conditions. Altogether it is pointed out the feasibility of using pelletised BSGs regardless of the malt type or mixture as a renewable source of energy in incineration plants above 500 °C." @default.
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• W4200503711 date "2022-03-01" @default.
• W4200503711 modified "2023-09-29" @default.
• W4200503711 title "Brewer’s spent grains as biofuels in combustion-based energy recovery processes: Evaluation of thermo-oxidative decomposition" @default.
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• W4200503711 doi "https://doi.org/10.1016/j.fuel.2021.122955" @default.
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