Simultaneous SO2/NO removal performance of carbide slag pellets by bagasse templating in a bubbling fluidized bed reactor.

Abstract Carbide slag pellets fabricated by bagasse templating using extrusion-spheronization were proposed to simultaneously remove SO 2 /NO from flue gas. The effects of the reaction temperature, O 2 concentration, mass ratio of bagasse to carbide slag and particle size on the simultaneous SO 2 /NO removal performance of carbide slag pellets were investigated in a bubbling fluidized bed reactor. CaO in the carbide slag pellets has a significant promotion effect on NO reduction by CO. SO 2 and NO are completely removed by the carbide slag pellets at 825–875 °C. The presence of O 2 in the reaction gas results in an adverse effect on NO removal by carbide slag pellets, while it leads to a positive effect on SO 2 removal. With an increase in the mass of bagasse in the pellets, the duration for the complete NO removal becomes longer and the porosity of the pellets appears higher. Carbide slag pellets with a smaller particle size possess a higher NO removal capacity. The higher mass ratio of bagasse to carbide slag leads to a larger surface area and pore volume of the pellets during SO 2 /NO removal process but results in a slight decrease in the attrition resistance. Carbide slag pellets by bagasse templating for simultaneous SO 2 /NO removal seems promising in the industrial application. Highlights • Bagasse templated carbide slag pellets are fabricated by extrusion-spheronization. • Carbide slag provides a significant promotion effect on NO reduction by CO. • Bagasse template improves SO 2 sorption capacity of carbide slag pellets. • Carbide slag pellets achieve efficient simultaneous SO 2 and NO removal. [ABSTRACT FROM AUTHOR]