摘要
通过元素分析和红外光谱等手段探讨了电袋复合除尘器中聚苯硫醚（PPS）滤料失效的可能原因，并估算了烟气中NO2、SO3酸性气体在低温结露时生成的酸溶液的浓度，进而选用质量分数为0%～5%的硝酸和20%～35%的硫酸模拟结露生成的酸溶液对PPS滤料进行耐腐蚀测试。结果表明，滤料失效的主要原因是PPS被结露生成的酸所氧化；相对于H2SO4和HCl溶液，HNO3溶液具有更强的氧化作用；老化168h后PPS的断裂强度保持率最大可能降至新滤料的20%。因此，降低烟气酸露点和烟气中NOx的含量是防止PPS滤料被腐蚀破坏的关键。
The possible reasons for the invalidation of polyphenylene sulfide （PPS） used in electrostatic-fabric integrated precipitator were explored by elemental analysis and infrared spectroscopy analysis. Based on the estimation for the acid solution concentration of the condensation of acid gases NOx and SO3 at low temperature, a diluted acid with an appropriate mass fraction （0%～5% nitric acid and 20%～35% sulfuric acid） simulating acid solution formed during the condensation process was used to test the anti-corrosion ability of PPS. The results indicate that the main reason for the degradation of PPS is the oxidation of PPS with the acid formed during the condensation. Compared to that of H2SO4 and HCl solution, the oxidation capacity of HNO3 solution is stronger, resulting in a significant decreasing to nearly 20% of breaking strength retention of PPS after the 168h-ageing. It could be reasonably inferred that reducing the dew point temperature of flue gas and the NOx concentration in the gas is of great importance in improving the service life of PPS.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2013年第11期36-41,共6页
Polymer Materials Science & Engineering
关键词
聚苯硫醚
滤料
失效
酸性气体
氧化
polyphenylene sulfide
filters
failure
acid gas
oxidation
