Development of a novel cascaded hydrothermal carbonization and pyrolysis process to produce biowaste-derived carbons (el. knyga) (skaityta knyga) | knygos.lt

Aprašymas

Brewer's spent grains (BSG), a byproduct of beer production, represent a promising feedstock for the sustainable production of carbonaceous materials. However, their high moisture content limits direct conversion through pyrolysis. To overcome this limitation, this dissertation investigates a novel cascaded process combining hydrothermal carbonization (HTC) and subsequent pyrolysis. The study examines the influence of HTC pretreatment on the thermal degradation behavior, pyrolysis kinetics, volatile matter composition, and physicochemical properties of BSG-derived carbon materials. Non-isothermal kinetic analyses and characterization of the resulting chars were performed to evaluate the effects of coupling both thermochemical processes. The results demonstrate that HTC pretreatment reduces the activation energy required for pyrolysis and improves the properties of the final carbon materials. Low-temperature HTC followed by pyrolysis at 600 °C produced chars with higher carbon content, larger surface area, and lower ash content compared to direct pyrolysis of BSG. Furthermore, the cascaded process maintained comparable mass and carbon yields, highlighting its potential for efficient biomass valorization. These findings demonstrate the potential of integrating HTC and pyrolysis to convert wet biomass residues into tailored carbonaceous materials. Further research should address process energy efficiency, economic feasibility, and the applicability of this approach to other biomass feedstocks.