Abstract:

In order to solve the SO₂ poisoning problem of the existing Mn-based catalytic filter bags, a catalytic filter bag based on V₂O₅-MoO₃/TiO₂ was prepared for the simultaneous removal of NO_x and dust in the range of 180—260℃. The experimental results displayed that the double-layer filter bags had excellent denitration activity and SO₂/H₂O-resistant stability when the gas filter surface velocity was 0.2 m/min. The double-layer catalytic filter bags were used in the pilot-scale test of pure oxygen glass kiln, when the flue gas volume was about 2000—3000 m³/h, SO₂ concentration in the range of 20—30 mg/m³, the water vapor content was 10%(vol) and NO_x concentration in the range of 400—550 mg/m³, the NO_x conversion reached 88.14%—95.06% from 170℃ to 210℃, and the good denitration performance of catalytic filter bags had been verified. After 1500 h of continuous operation, the activity showed a slight decay of about 5%. Under high-sulfur flue gas conditions (300—500 mg/m³) for 100 h continuous operation, the catalytic filter bag was found to be deactivated. SEM-EDS and XPS characterizations proved that the catalyst deactivation was due to the deposition of ammonium sulfate on the surface of the filter bag fiber and the part of active site is covered.

Key words: V₂O₅-MoO₃/TiO₂, catalytic filter bag, SCR, SO₂/H₂O resistant, pilot-scale test

摘要：

为解决现有Mn基催化滤袋SO₂中毒的问题，制备了基于V₂O₅-MoO₃/TiO₂的催化滤袋，用于在180~260℃范围内同时去除NO_x和粉尘。实验结果表明，双层滤袋在气体过滤面速度为0.2 m/min时具有良好的脱硝活性和抗硫抗水性能。在纯氧玻璃窑炉中试中采用制备的双层催化滤袋进行了试验，烟气量为2000~3000 m³/h、SO₂浓度在20~30 mg/m³范围内、水蒸气含量10%（体积分数）、NO_x浓度为400~550 mg/m³，在170~210℃范围内NO_x转化率可达到88.14%~95.06%，验证了催化滤袋的脱硝性能；连续运行1500 h后，活性出现5%左右的微弱衰减；在高硫烟气条件下（300~500 mg/m³）连续运行100 h发现催化滤袋失活，SEM-EDS和XPS表征证明催化剂失活是由于硫铵类物质在滤袋纤维表面沉积，部分活性位点被覆盖所致。

关键词: V₂O₅-MoO₃/TiO₂, 催化滤袋, 选择性催化还原, 抗硫抗水, 中试应用