Abstract
In this study, hazelnut and walnut shells were gasified with steam in a lab-scale updraft fixed bed reactor. Operating temperature effects on syngas composition were investigated experimentally. It is aimed to optimize the temperature of gasification for producing hydrogen and methane gases. Gasification was carried out at 600 °C, 650 °C, 700 °C, 750 °C and 800°C. The experimental results showed that the amount of hydrogen content in syngas increased with increasing temperature but amount of methane content decreased during both fuels' gasification. The optimum gasification temperatures of hazelnut and walnut shells were obtained as 750 °C and 800°C for producing hydrogen in syngas, respectively. On the other hand, lower gasification temperatures than 700 °C favored the methane content instead of hydrogen in syngas. Optimum temperature for methane production from hazelnut shells was obtained as 600 °C and for walnut shells was obtained as 650 °C. These findings make it possible to arrange the required composition of desired syngas content for different usage areas like hydrogen/methane utilization or chemicals production.
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