SCR脱硝催化剂动态再生试验研究

火电厂采用选择性催化还原（SCR）法进行烟气脱硝,所用催化剂价格昂贵,因此有必要对使用过的旧催化剂进行再生。采用7种不同配方的再生液分别对典型的旧催化剂进行动态再生,对再生后的旧催化剂进行脱硝效率和SO₂/SO₃转化率试验,并运用扫描电镜、能谱分析等方法对新催化剂及再生与否的旧催化剂试样进行微观结构和元素组成分析,以评价各再生剂的再生效果和分析催化剂催化效率下降的原因。研究表明,旧催化剂经最佳配方再生液再生后,脱硝效率可增至72.2%,较再生前提高10%,达到新催化剂脱硝效率的92.8%,展现出了良好的应用前景。

Experimental Study on Regeneration of SCR De-NOx catalysts

The catalyst adopted in the selective catalytic reduction (SCR) flue gas denitrification for thermal power plants is very expensive, which makes it necessary to regenerate the used catalyst. Seven regeneration liquids were prepared and used to regenerate the typically used SCR De-NO_x catalyst samples from coal-fired boilers. Then the denitrification efficiency and SO₂/SO₃ conversion rate of the regenerated catalysts were tested. SEM and EDS analyses on the micro structure and element composition of the fresh and regenerated catalysts were also conducted to evaluate the regeneration efficiency and figure out the reasons for the decrease of catalytic efficiency. The results show that the De-NO_x efficiency of the used catalyst regenerate by the optimum formula regeneration liquid is up to 72.2%, which is 92.8% of fresh catalyst efficiency and 10% higher than that of the catalyst before regeneration. This means that optimum formula regeneration liquid has a promising perspective for the engineering applications.