To enhance the F class gas turbine air intake system's capture ability on tiny particles of 0.4μm or lower

the air filter of the turbine air intake system was improved.The filtering level was enhanced to H11 on premise of keeping two-stage filter design.In the first stage of coarse filter

multilayer chemical fiber containing nonwoven filter was adopted

with filter level of F5

the air inlet filtering system had better adaptability and was not easy to be clogged by sticky particles.In the second stage of fine HEPA filter

the efficient glass-fiber was adopted

with filter level of H11

its initial filter efficiency for particles of 0.4μm reached 96%

about 59% higher than that of the old type filter.After optimization

the field application effect can meet the relative requirements and the unit efficiency was increased.