高效复合型亚铁络合剂同时脱硫脱硝

Simultaneous desulfurization and denitration of flue gas using compound ferrous complexant

采用自制喷淋塔进行湿法同时脱硫脱硝实验,在乙二胺四乙酸(EDTA)络合亚铁吸收液及半胱氨酸络合亚铁吸收液的基础上,研制出复合吸收液。实验结果表明:对于单一络合物吸收液,EDTA络合亚铁吸收液的脱硝效果较好,可在70 min内保持60%以上的NO脱除率,而半胱氨酸络合亚铁吸收液则可长时间保持较好的脱硫效果,可在180 min内保持90%以上的SO_2脱除率;复合吸收液的脱硫脱硝性能较单一络合物吸收液有明显提高,在络合物浓度为0.05 mol/L、吸收液pH为8、EDTA与半胱氨酸的摩尔比为1∶2、Fe^(2+)浓度为0.075 mol/L的优化条件下,90 min内的NO脱除率基本保持在70%以上,SO_2脱除率基本达到100%。

Experimental study on the wet method of simultaneous desulfurization and denitration were carried out in a self-made spray tower. The composite absorption liquid was developed from the absorption liquids of ethylenediaminetetraacetic acid （EDTA） complex ferrous and cysteine complex ferrous. The experimental results showed that： For single complex absorption liquid, the denitration effect of EDTA complex ferrous absorption liquid was better and the NO removal rate by it could maintain more than 60% in 70 min, while the desulfurization effect of cysteine complex ferrous absorption liquid was better in a long time and the SO2 removal rate by it could maintain more than 90% in 180 min; The desulfurization and denitration capability of the composite absorption liquid was better than that of any single complex absorption liquid, and under the optimum conditions of complex concentration 0.05 mol/L, absorption liquid pH 8, mol ratio of EDTA to cysteine 1 ： 2, Fe^2＋ concentration 0.075 mol/L and reaction time 90 min, the removal rate of NO and SO2 was more than 70% and almost 100% respectively.