Steam gasification characteristics of char pellets of typical technical solid wastes

Abstract

Steam gasification performance of char pellets for typical technique solid waste (gloves, paper towel, coveralls, sawdust and their mixture) in nuclear power plant were examined between 700 °C and 900 °C at four steam concentrations (20 %, 40 %, 60 % and 80 %) in a lab-scale fixed-bed gasifier. There was certain synergistic effect in mixture gasification. The average percentage of solid residues for mixture char pellets was 32 % at the steam concentration of 20 %, which fell down about 71 % with lifting the steam concentration to 80 %. The activation energy of the mixture char pellets was 82.7 kJ mol−1. The kinetic parameters of steam gasification for all samples were well estimated based on shrinking core model. The maximum mass reduction ratio of mixture char through gasification was 98 %. The total maximum mass reduction ratios of primary samples through further gasification treatment were over 98 % that was much higher than that only through pyrolysis.