CO2对石灰石脱硫剂的活化作用

在间歇式鼓泡反应器的烟气脱硫实验装置中，研究了CO2气体活化处理对石灰石脱硫剂浆液烟气脱硫效率的影响. 依据脱硫过程中石灰石脱硫剂浆液pH值随脱硫反应时间的变化规律，初步分析了CO2对石灰石脱硫剂的活化作用及活化后石灰石脱硫剂的烟气脱硫过程机理. 结果表明，CO2气体的活化处理促进了石灰石在水溶液中的溶解，进而改善了石灰石脱硫剂浆液的烟气脱硫反应活性，使处理后的石灰石脱硫剂浆液的烟气脱硫效率和脱硫剂的利用率提高. 基于流化床反应器连续过程的实验结果，证实了CO2对石灰石脱硫剂的活化作用. 为提高石灰石在烟气脱硫中的反应活性提供了一种新的工艺，可用于烟气脱硫中对石灰石脱硫剂浆液的活化.

Effect of CO2 on Activation of Limestone Used as Desulfurization Sorbent

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.