PROCESS-DEVELOPMENT OF EFFECTIVE SEMIDRY FLUE-GAS DESULFURIZATION BY POWDER-PARTICLE SPOUTED BED

At present wet scrubbers are applied widely in flue gas desulfurizatio n (FGD) systems. However, low cost, high efficiency and no waste water FGD technologies are expected. In order to develop a new type of semi -dry FGD equipment, powder-particle spouted bed (PPSB) was applied to a low temperature desulfurization process. Fine powder slurries of SO2 sorbent were continuously fed to the turbulent spouted bed, in which coarse fluidized medium particles were fluidized with simulated flue g as containing of 500-1500 ppm SO2. Slaked lime or limestone slurries o r NaOH solution were used as the SO2 sorbent. These slurries were flui dized with coarse particles and dried; SO2 sorbent was while reacted w ith SO2 gas, entrained from the bed, and collected by a bag filter. In this experiment the effects of kind of and size of SO2 sorbent, bed t emperature, and humidity of the gas upon the removal of SO2 were inves tigated. SO2 removal was not only affected by Ca/S ratio and reaction temperature, but also affected by the humidity of the gas. More than 9 0% SO2 removal was obtained at Ca/S = 1.0 in the temperature range of 330-340 K. From the results of this work, it will be possible to devel op a new desulfurization process of high efficiency in the future.