Effect of CO2 on Activation of Limestone Used as Desulfurization Sorbent
CO2对石灰石脱硫剂的活化作用

The effect of CO2 gas on activation of limestone used for removal of SO2 from flue gas was experimentally studied in a bubbling bed reactor in batch operation. Based on variation of pH value with the desulfurization time, the mechanism of SO2 reacting with limestone activated by CO2 was also investigated. The experimental results show that high desulfurization efficiency and sorbent utilization ratio relative to high dissolution rate of limestone in water solution could be obtained by long time contact with CO2 gas. And the effect of CO2 gas on activation of limestone was confirmed by the experimental results from continuous operation with a fluidized bed as reactor. Accordingly, a new process to improve activity of limestone in the reaction with SO2 has been developed, which may find industrial application in a flue gas desulfrization process with limestone slurry as desulfurization sorbent.