Humidity Considerations in Filter Testing Based on Analysis of Filters from Gas Turbine Applications

Abstract

Depth filters used in multistage filter systems adeptly clean the intake air of gas turbines, preventing damage and increasing performance. However, estimation of their service life is based on empirical data and/or standardized testing procedures, e.g., ISO 16890. By applying standardized synthetic test dusts at constant reference humidity, these testing procedures do not reflect application-typical loading conditions. Based on a direct comparison with field data, the influence of temporary exposure to high relative humidity on differential pressure and particle deposit structure is investigated. The results indicate that simulating humidity variations of the ambient atmosphere during filter tests leads to particle deposits, which more accurately reflect the actual behavior during operation.

Impact of Seams on the Operating Behavior of Surface Filters Regarding Particle Emissions

“…S1 (Supporting Information), with a U-SMPS (Palas ) to determine the particle size distributions and number concentrations was used. Detailed information about the procedure and this test rig can be found in the Supporting Information and in the work by Schwarz et al [18]. To evaluate emission behavior during filtration and regeneration events over multiple cycles, a VDI 3926 test rig was employed, with an optical emission measurement consisting of a Promo 2000 with a Welas 2100 sensor from Palas ; see Fig.…”