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由高压条件下聚结过滤用滤芯的现场试验发现,随现场运行时间的延长,滤芯对粒径小于4μm颗粒的过滤效率明显降低,分析其原因为高压气流持续冲击使部分滤层的填充密度降低。为此,利用气-液过滤性能评价系统,分别测定纤维层面密度在13~50g/m2范围内的聚酯纤维(PET)和聚丙烯纤维(PP)滤芯的过滤性能。结果表明:随滤材纤维层面密度增大,滤芯压降相应升高,出口液滴质量浓度降低,这与滤芯现场试验的结论较为一致。PP滤芯的稳态压降明显低于PET滤芯,且不同纤维层面密度的PP滤芯的性能差别较大。将实验结果与填充密度修正型过滤效率模型的理论值对比发现,PET滤芯的实验值与理论值的误差小于1%。研究结果为工程实际用滤芯的优化设计提供了参考,具有一定的工程实际意义。
The field test of the filter element with coalescence and filtration under high pressure showed that the filtration efficiency of the filter element with the particle size less than 4μm decreased obviously with the increase of the operating time of the filter. The reason for the analysis was that the sustained impulse of high pressure air stream reduced the packing density of some filters . For this purpose, the filtration performance of polyester fiber (PET) and polypropylene fiber (PP) filter with the density of 13 ~ 50g / m2 was measured by the gas-liquid filtration performance evaluation system. The results show that with the increase of filter fiber layer density, the pressure drop of filter element increases correspondingly and the mass concentration of outlet droplet decreases, which is consistent with the conclusion of field test. PP filter steady-state pressure drop was significantly lower than the PET filter, and different fiber surface density of the PP filter performance varies widely. The experimental results are compared with the theoretical values of the model of the packing density-corrected filtration efficiency model. It is found that the error between the experimental value and the theoretical value of the PET filter is less than 1%. The research results provide a reference for the actual design of the filter with the actual engineering significance.