TG- MS study on in-situ sulfur retention during the co-combustion of reclaimed asphalt binder and wood sawdust

Reclaimed asphalt binder (RAB) releases large amounts .of hazardous sulfur-containing gases during combustion. This study attempts to introduce wood sawdust (WS) as an in-situ inhibitor of sulfur release during the combustion of refuse-derived fuel (RDF) blended with RAB-WS. The combustion characteristics, gaseous sulfur containing products, interactions and combustion kinetics of RDF were investigated through thermogravimetry and mass spectrometry (TG-MS), and the mechanisms on migration and distribution of sulfur were revealed. Results indicated that WS additive inhibits the volatilization of light components and promotes the degradation of macromolecular components. WS addition improved the combustibility, burnout performance and combustion stability of RAB. The sulfur release of RAB-based RDF was mainly derived from resins and asphaltenes. WS addition generally decreased all gaseous sulfur-containing compounds (CH3SH, COS, SO2, CS2 and thiophene). Interactions between RAB and WS restrained all sulfur-containing gas emissions, and the normalized sulfur inhibition ratio reached 40.99 %. The Sarink and DAEM models could well describe the kinetic process of the co combustion of RAB and WS. WS addition led to a decrease in activation energy, namely, it lowered the reaction barrier. Sulfur could be retained in-situ into incineration residue through the formation of sulfate minerals during the co-combustion of RAB and WS.

Automated summary

The study successfully reduced the release of hazardous sulfur gases during the combustion of reclaimed asphalt binder blended with refuse-derived fuel by using wood sawdust as an inhibitor. The addition of wood sawdust improved combustion characteristics, enhanced combustion stability, and inhibited sulfur gas emissions.