Development of IGV-less Single Stage Centrifugal Blower for Sewage Aeration

Abstract

IGV-less single stage centrifugal blower was developed to increase the total performance for lower-flow-rate operation condition. Recirculating casing treatment technique was used for the operation range enhancement. The casing treatment extended the operation range 11% than conventional case. The casing treatment could prevent the stall occurrence and extended the range. By using the casing treatment, the total blower efficiency on actual plant operation condition at lower-flow-rate operation was increased.