铜锰基整体式催化剂对烧结烟气CO净化特性

基于改性铜锰氧化物作为CO催化活性组分,分别制备了催化剂原粉、以泡沫金属、堇青石为载体的两种整体式催化剂,在实验室配气条件下对比了3种样品的CO催化效率及稳定性,优选了堇青石整体式催化剂,并在某钢厂实际烧结烟气条件下测试了其在不同催化剂负载量、空速、温度下的CO催化效率、稳定性以及衰减后样品催化特性;最后批量制备了2m³优选整体式催化剂并开展了6000m³/h烧结烟气CO净化中试实验.结果表明,烟气高浓水蒸气显著抑制CO催化反应,经240h催化后T₉₀最大提升38℃;催化剂负载量越高,T₉₀越低,催化效率衰减时间越短,稳定后的效率越高,但随着空速增加,该优势减小;1440h(2个月)中试实验中,进气温度185~195℃下,CO催化效率大于85%(平均90%),出口CO浓度低于1000×10^-6,出口平均烟温达220℃,具有节能减排双重效益.

Performance of CO purification from sintering flue gas by copper - manganese - based monolithic catalyst

In this paper, the catalyst powder, the monolithic catalyst based on modified copper manganese oxides supported by foam metals and cordierite were prepared. The CO conversion efficiency and stability of the three samples were compared under the gas condition prepared in the laboratory. The monolithic catalyst supported by cordierite was selected, and its CO conversion efficiency, stability, and catalytic characteristics after degradation at different loading amounts, space velocities, and temperatures were tested under the actual condition of iron-ore sintering flue gas in a steel plant. 2m³ volume of optimized monolithic catalyst was prepared in batches and a pilot test of CO purification from 6000m³/h sintering flue gas was carried out. The results show that the high-concentration water vapor in the flue gas significantly inhibited the CO catalytic oxidation reaction, resulting in T₉₀ increased by 38℃ after reaction for 240h. The higher loading amount of the catalysts, the lower the T₉₀, the shorter the duration for efficiency decay, and the higher the stabilized efficiency. However, this advantage decreases with increasing space velocity. In the pilot test for 1440h (2months) at the inlet feed temperature of 185~195℃, the CO conversion efficiency was constantly greater than 85% (averaged at 90%), and the CO concentration downstream was lower than 1000×10^-6 with temperature reaching 220℃, which obtained benefit of both energy saving and emission reduction.