碱性硫酸铝吸收与解吸二氧化硫的机理及性能

采用实验的方法研究了碱性硫酸铝溶液吸收和解吸SO2机理，同时探讨了碱度20%、铝量20 g·L-1的碱性硫酸铝溶液温度变化对SO2吸收率的影响效果。结果表明，SO2进入碱性硫酸铝溶液中首先发生的是与活性Al3+的结合反应，当活性Al3+消耗殆尽后，则进行与H2O的结合反应；而在解吸过程中，首先是与H2O结合的SO2发生解吸反应，其后是与活性Al3+结合的SO2发生解吸反应。当吸收液温度低于50℃，且每升溶液中SO2通入量不高于5 L时，其吸收率均能维持在95%以上。

Mechanism and characteristics of sulfur dioxide absorption and desorption by alkaline aluminum sulfate

The absorption and desorption mechanism of SO2 in alkaline aluminum sulfate solution is experimentally determined in this study. Furthermore, the change in the SO2 absorbability with temperature in alkaline aluminum sulfate solution (20% alkalinity, 20 g·L-1 aluminum) is discussed. The results reveal that, after entering the alkaline aluminum sulfate solution, SO2 gas first reacts with the reactive aluminum. When the reactive aluminum is exhausted, SO2 gas reacts with H2O. In the desorption process, the SO2 combined with H2O undergoes desorption first, and then the SO2 combined with the reactive aluminum undergoes desorption. When the absorption temperature is below 50℃ and less than 5 L of SO2 is present in the solution, the absorption rate can exceed 95%.