超重力-磷酸钠法脱除低浓度SO2

为开发脱硫率高、成本低、可回收SO2的脱硫技术，以旋转填料床为吸收设备，磷酸钠溶液为吸收剂，系统开展了液气比L／G、转速N、气体中SO2浓度CSO2,in吸收剂磷酸浓度CL和初始pH等工艺参数和溶液再生循环次数对脱硫率叼影响的实验研究。结果表明，叩随L／G、N、CL和初始pH的增加而增大，且它们的值越低时，叩增加越明显；受G和CSO2,in影响较小。在适宜操作条件下，脱硫率达99％以上，出口SO2浓度低于100mg／m^3。磷酸钠溶液可再生循环使用，脱硫率稳定在99％以上。表明超重力-磷酸钠法脱硫技术在小的液气比下即可达到高的脱硫率，吸收剂循环使用，可实现低成本并达标治理SO2废气，且适用范围宽，具有良好的工业应用前景。

Removal of low concentration sulfur dioxide from gas by aqueous of sodium phosphate in high gravity

To explore high desulfurization efficiency and low cost of the recovery of SO2 in exhaust gas des- ulfurization technology, aqueous solution of sodium phosphate as the absorbent, influencing factors such as liq- uid-gas volume ratio （L/G） , rotating speed（N） , concentration of SO2 in inlet gas （CSO2,in） , phosphate concen- tration CL and initial pH value of the absorbent, and cycles were studied in a rotating packed bed （RPB）. The results show that the desulfurization efficiency （η） increases with the increasing of liquid-gas ratio, rotating speed , phosphate concentration and pH value, and increases rapidly when their values are lower, but the desul- furization efficiency has no obvious distinction with the increase of concentration of SO： in inlet gas. The desulfu- rization efficiency can exceed 99% and the outlet gas concentration of SO2 is lower than 100 mg. m-3 under the appropriate operating conditions. The absorbent is renewable recycling, and the desulfurization efficiency reaches above 99%. Further, such a high gravity desulfurization of gas technology showed a potential industrial applica- tion, with aqueous solution of sodium phosphate. It is due to its great advantages of higher desulfurization effi- ciency, lower energy consumption, larger operating flexibility, etc.