The dry-type flue gas treatment system using sodium-based dechlorinating agent at the fluidized bed gasification/swirl-flow melting system

Abstract

At Sashima Clean Center Teraku (103t/day,2line), which is the facility of the fluidized bed gasification/swirl-flow melting system, has adopted the dry-type flue gas treatment system using sodium-based dechlorinating agent. Investigation is carried out on the removal efficiency of the acid gases(HCl and SOx) in flue gas from the furnace. By injecting the sodium-based dechlorinating agent into secondary bag filter, both HCl and SOx concentrations in the flue gas at the stack is less than 10ppm and the highly efficient removal of HCl and SOx is maintained. The pressure drop and the transport of the exhaust ash of the secondary bag filter is evaluated to be the same as those of slaked lime injection. The equivalent ratio of the soldium-based dechlorinating agent is lower, and both the HCl and SOx removal efficiency is higher, in comparison with slaked lime usage respectively.