Contributions of the Secondary Jet to the Tangential Velocity Distribution and to the Collection Efficiency of the Fixed Guide Vane Type Axial Flow Cyclone Dust Collector

In order to control the maximum tangential velocity V?m(m/s)of the turbulent rotational air flow and the collection efficiencyηc(%)using the fly ash of the mean diameter X R50=5.57?m,two secondary jet nozzles were installed to the body of the axial flow cyclone dust collector with the body diameter D1=99mm.Then in order to estimate V?m(m/s),the conservation theory of the angular momentum flux with Ogawa combined vortex model was applied.The comparisons of the estimated results of V?m(m/s)with the measured results by the cylindrical Pitot-tube were shown in good agreement.And also the estimated collection efficienciesηcth(%)basing upon the cut-size Xc(?m)which was calculated by using the estimated V?m(m/s)and also the particle size distribution R(Xp)were shown a little higher values than the experimental results due to the re-entrainment of the collected dust.The best method for adjustment ofηc(%)related to the contribution of the secondary jet flow is principally to apply the centrifugal effect?c(1).Above stated results are described in detail.

In order to control the maximum tangential velocity Vθm（m/s）of the turbulent rotational air flow and the collection efficiencyηc（%）using the fly ash of the mean diameter X R50=5.57μm,two secondary jet nozzles were installed to the body of the axial flow cyclone dust collector with the body diameter D1=99mm.Then in order to estimate Vθm（m/s）,the conservation theory of the angular momentum flux with Ogawa combined vortex model was applied.The comparisons of the estimated results of Vθm（m/s）with the measured results by the cylindrical Pitot-tube were shown in good agreement.And also the estimated collection efficienciesηcth（%）basing upon the cut-size Xc（μm）which was calculated by using the estimated Vθm（m/s）and also the particle size distribution R（Xp）were shown a little higher values than the experimental results due to the re-entrainment of the collected dust.The best method for adjustment ofηc（%）related to the contribution of the secondary jet flow is principally to apply the centrifugal effectФc（1）.Above stated results are described in detail.