The paper presents an experimental and theoretical investigation of a sewage sludge gasification process. An experimental installation with an downdraft gasifier was used. Theoretical analysis has been focused on the calculation of the gas composition from sludge gasification using equilibrium modeling. In both cases the influence of composition, volatile matter, water and heavy metal content of the syngas composition of sewage sludge was examined. The results show that greater oxygen content in sewage sludge causes a reduction in the reaction temperature. As expected, increasing the air flow rate caused a decrease in the heating value of the produced gas. A higher amount of oxidizer increases the amounts of noncombustible species and volumetric fraction of nitrogen, thus reducing the heating value of the obtained gas. Higher water content in the sewage sludge affects the gasification gas composition. As a result, combustible components are in the minority in the syngas.
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