杂多酸水溶液脱除烟气中SO_2新方法的研究(英文)

A NEW PROCESS OF SO_2 REMOVAL FROM FLUE GAS WITH AQUEOUS SOLUTIONS OF HETEROPOLY ACIDS

在孔板式吸收器 (孔板孔径 :5 0 μm～ 70 μm)中对杂多酸水溶液脱除烟气中SO2 的新方法进行了研究。在所考察的几种杂多酸中 ,H3PW1 2 O40 和H4SiW1 2 O40 对SO2 的脱除率较为接近 ,H7PMo2 W1 2 O49和Na2 HPMo1 2 O40 对SO2的脱除率相对较高 ,其中后者对SO2 的脱除率最高。杂多酸 (HPA)对SO2 的脱除率随HPA浓度的提高而增高 ,随进气中SO2 的浓度或吸收温度提高而减低。常温有利于HPA对SO2 的脱除。NaCl,NH4VO3,CuSO4及H3PO4这四种添加剂均能提高HPA对SO2 的脱除率。复配体系中 ,以上添加剂对HPA的最优配比为 :NaCl HPA∶H3PO4 HPA∶NH4VO3 HPA∶CuSO4 HPA =1 6∶1 8∶1 2∶1 4。进气中有NOx 存在下 ,HPA对SO2 的脱除率明显提高 ,当进气中NOx的质量浓度超过SO2 时 ,HPA对SO2 的脱除率接近 10 0 %。提出了在NOx 存在下HPA对SO2 的脱除反应式 ,这些反应式能够很好地说明NOx 的作用效果。以上结果表明

A preliminary investigation on a new method of flue gas desulfurization involving the use of heteropoly acids was presented A multiorifice plate glass absorption reactor (hole diameter: 50?μm～70?μm) was used to investigate the performance of the absorbent solution Of the heteropoly acids investigated, there is only a slight difference in SO 2 removal efficiency between H 3PW 12 O 40 and H 4SiW 12 O 40 , the SO 2 removal efficiency of H 7PMo 2W 12 O 49 and Na 2HPMo 12 O 40 appears to be higher, the performance of Na 2HPMo 12 O 40 is the best among the four The SO 2 removal efficiency of HPA increases with the increase of its concentration, decreases with the increase of the feed gas SO 2 concentration and absorption temperature Room temperature was determined to be favourable for SO 2 removal All additives including NaCl, NH 4VO 3, CuSO 4 and H 3PO 4 were confirmed to have positive effect on the SO 2 removal efficiency of HPA The optimum molar ratios of additives to HPA in the multi additive absorbent system were confirmed to be: NaCl/HPA∶H 3PO 4/HPA∶NH 4VO 3/HPA∶CuSO 4/HPA=1/6∶1/8∶1/2∶1/4 In the presence of NO x in the feed gas, the SO 2 removal efficiency increases markedly, and it reaches 100% when the mass concentration of NO x exceeds that of SO 2 The probable reactions during desulfurization in presence of NO x were proposed, which could well illustrate the effect of NO x