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

Carbide slag pellets fabricated by bagasse templating using extrusion-spheronization were proposed to simultaneously remove SO2/NO from flue gas. The effects of the reaction temperature, O2 concentration, mass ratio of bagasse to carbide slag and particle size on the simultaneous SO2/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. SO2 and NO are completely removed by the carbide slag pellets at 825-875 °C. The presence of O2 in the reaction gas results in an adverse effect on NO removal by carbide slag pellets, while it leads to a positive effect on SO2 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 SO2/NO removal process but results in a slight decrease in the attrition resistance. Carbide slag pellets by bagasse templating for simultaneous SO2/NO removal seems promising in the industrial application.