NO_2对烟气除尘用聚苯硫醚滤料机械性能的影响

燃煤锅炉烟气除尘中,发现烟气组分对滤料机械性能有影响.模拟烟气条件,研究了在NO2气体环境下聚苯硫醚滤料性能随NO2浓度、作用时间和温度的变化.结果表明:随着NO2浓度增大、作用时间延长、温度升高,滤料强度下降明显,在3mL/L,190℃,120h时滤料经向和纬向强度保持率仅为55.8%和48.7%.通过电镜扫描发现在NO2作用下,PPS纤维出现明显断裂;由于NO2的氧化性,在聚苯硫醚分子链上加入氧元素后,使其颜色加深,脆性显著增加.烟气中NO2是导致滤料寿命降低的原因之一,现场应用时,应通过生产工艺降低其含量.

Effect of NO2 on Mechanical Properties of Polyphenylene Sulfide Filter for Smoke Dust Removal

It was found that the composition of flue gas from coal-fired boiler affects adversely the mechanical properties of PPS(polyphenylene sulfide) filter during smoke dust removal. Simulating the flue gas conditions, the change in PPS filterability with the three factors, i.e., NO2 concentration, functioning time and temperature in NO2 atmosphere. The results showed that the mechanical strengths of the filter decrease obviously if the values of the three factors increases, and the retention rates of both the warp and weft filter strengths are just 55.8% and 48.7% at 3 mL/L, 120 h and 190°C. Some fibers of the filter are found broken from SEM images because of the oxidation of NO2, and the filter becomes darker in color with brittlement enhanced greatly after adding the oxygen atoms in the PPS molecule chain. NO2 is one of the reasons why the service life of the filter is shortened. So, the concentration of NO2 should be decreased on site via the technology measures available to take.