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Study of small-size inertial louver-countercurrent dust collector

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Since louver type collector has reduced dimensions, it can be used as a pre-separator in addition to a filtering installation, in order to increase the degree of mechanical separation of dust particles. The use of the louver type collector in a filtering installation requires a description of the particle movement inside the device and also a method for determining the rate of particles separation.
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The cyclone separator has a simple structure but cannot effectively separate respirable dust of smaller particle sizes. The cartridge filter has a high separation efficiency, but its pressure drop increases too rapidly, requiring frequent cleaning operations. To make up for these defects, a novel cartridge-filtering cyclone combining both cyclone separator and cartridge filter is presented. Its performance parameters, including pressure drop, overall separation efficiency, grading efficiency, and cleaning interval, were studied experimentally and compared with those of the common cyclone and cartridge filter. The cartridge-filtering cyclone first pre-separates the larger particles by swirling airflow, and then filters out the fine particles through the filter cartridges, thus slowing down the increasing rate of the pressure drop and forming denser dust layers attached to the surface of the filter cartridges. The experimental results show that the cartridge-filtering cyclone has a better dust removal effect. At an inlet flow rate of 50 m³/h, the separation efficiency of the cartridge-filtering is 99.86%, which is 15.32% and 0.05% higher than that of the common cyclone and cartridge filter, respectively. In particular, the cartridge-filtering cyclone has a preferable separation effect on fine particles, with a separation efficiency for 2.5 μm particles of 99.11%, which is 70.80% and 0.08% higher than that of the common cyclone and cartridge filter, respectively. Compared with the cartridge filter, the cleaning interval of the cartridge-filtering cyclone is extended and the total dust emission is reduced. Over the whole experimental period, the average cleaning interval and dust emission concentration of the cartridge-filtering cyclone are 1290.05 seconds and 12.06 mg/m³ respectively, while that of the cartridge filter are 805.32 seconds and 14.59 mg/m³, respectively.
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External air injected into a gas turbine contains many solid particles, which can reduce the performance and life of the turbine. In this study, a louver dust collector, which is a type of inertial dust collector, was used to remove solid particles from air, and the shape of the dust container, which is part of the louver dust collector, was modified to improve dust collection efficiency. As existing dust containers have a structure for isolating particles, the inflow of the air into the dust containers is limited and effective removal of particles is difficult. In this study, slits were drilled in the dust container, baffle plates were used, and raised spots were added to improve particle collection efficiency through improved air flow in the dust container and increased inertia effect of the particles. The trajectory of the particles and the collection efficiency for each dust container shape were predicted using numerical analysis and the numerical analysis results were verified using a wind tunnel test. Results indicate that for an air flow rate of 3 m³/min, the collection efficiencies of the louver dust collectors with the one-slit model dust container and two-slit model dust container improved by 40.1% and 43.5%, respectively compared with that of the louver dust collector with the existing dust container. Furthermore, for an air flow rate of 6 m³/min, the collection efficiencies of the louver dust collectors with the one-slit model dust container and two-slit model dust container improved by 32.9% and 37.6%, respectively, compared with that of the louver dust collector with the existing dust container. Therefore, it is expected that the particle collection efficiency of the existing louver dust collector can be effectively increased by utilizing the shape of the dust container proposed in this study.
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A new structure of a combined dust collector, in the unified energy field of which suspended particles are separated in interacting swirling flows, with subsequent aftercleaning of the gas by filtration has been developed. The hydraulic resistance of the combined dust collector has been investigated. The change in the pressure loss as a function of the total rate of flow of the gas in the apparatus and the flow-rate ratio has been determined. The dependence for calculation of the hydraulic resistance of this dust collector has been obtained.
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Calculation of the effective separation of light impurities in the inertial jalousiecountercurrent dust collector
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