Co-Gasification Synergistic Characteristics of Sewage Sludge and High-Sodium Coal

Abstract

A comprehensive study was conducted to assess the co-gasification characteristics of sewage sludge and high-sodium coal. As the gasification temperature increased, the CO₂ concentration was decreased, and the concentrations of CO and H₂ were increased, while the change of CH₄ concentration was not obvious. As the coal blending ratio increased, the H₂ and CO concentrations initially increased and then decreased, while the CO₂ concentration initially decreased and then increased. The mixture of sewage sludge and high-sodium coal shows the synergistic effect of co-gasification, and the synergistic effect was to promote the gasification reaction positively. The average activation energies of co-gasification reactions were calculated by the OFW method, and the average activation energy initially decreases and then increases as the coal blending ratio increases. Both fluidized-bed gasification and thermogravimetric analyzer gasification show that the optimum coal blending ratio is 0.6. Overall, these results provide a theoretical basis for the industrial application of sewage sludge and high-sodium coal co-gasification.