As a novel technology in chemical engineering,gas-continuous impinging streams (GIS) has the important feature of enhancing significantly transfer between phases [1],and for the processes involving rapid reaction on surface of or inside particles/droplets in dispersed phase and thus controlled by 8as-film diffnsion its enhancing effect is remarkable.Wet flue gas desulfurization (FGD) with dehydrated lime as the absorbent falls into this category.