Abstract：Low temperature SCR is the main development direction of sintering flue gas denitrification technology, and catalyst is the key factor. According to the characteristics of sintering flue gas, a low temperature-plate type-anti alkali metal poisoning denitrification catalyst was developed. In order to clarify the denitrification activity, operation stability, ash deposition and alkali metal poisoning resistance of the catalyst, the semi-industrial test on low temperature SCR denitrification catalyst was carried out after the activated carbon desulfurization and denitrification device of 450 m2 sintering machine of Tisco. The results showed that the average denitrification efficiency was 85% at 150 ℃, NOx emission was below 50 mg/m3, and ammonia slip was less than 1.0 μL/L, which fully met the requirements of ultra-low emission of sintering flue gas. The ash in catalyst layer was mainly potassium salt and activated carbon powder. Through 60 days running test, the increase of pressure difference caused by ash deposition was only 90 Pa. The alkali metal poisoning resistance of the catalyst was outstanding, and the denitrification activity did not change significantly when the content of potassium accumulated on the surface of catalyst was 5.5-7.0 times that of fresh catalyst.
李永光, 安璐, 任翠涛, 李盛学, 乔凯荣. 烧结烟气低温SCR脱硝催化剂半工业化试验[J]. 中国冶金, 2021, 31(2): 95-102.
LI Yong-guang, AN Lu, REN Cui-tao, LI Sheng-xue, QIAO Kai-rong. Semi-industrial test on low temperature SCR denitrification catalyst for sintering flue gas[J]. China Metallurgy, 2021, 31(2): 95-102.
DENG L, LIU X,CAO P Q, et al. A study on deactivation of V2O5-WO3-TiO2 SCR catalyst by alkali metals during entrained-flow combustion[J]. Journal of the Energy Institute,2017, 90(5): 743.
2021, Vol. 31 
