Fluids mixing apparatus

• Main Authors: JOHNSON, HOWARD KEVIN, ENGELBRECHT, HORST P
• Format: Patent
• Language: English; French; German
• Published: 03.09.1980
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The apparatus for mixing fluids, particularly gases with liquids as in aeration of sewage effluent, comprises a rotary axial flow impeller (16) with hollow airfoil blades (18) communicating with a hollow drive shaft (30). The blade profiles define upper and lower, suction and pressure surfaces (50) and (52) respectively and holes (38) are provided in the suction surfaces (50) for the venting into the liquid of gas entrained into the hollow blades (18) through shaft (30) via a flow control device (36). To achieve high stripping efficiency, each blade has a maximum camber length about 2%to 6%of chord length located about 20% to 60% of the chord length away from the leading edge of the blade, a maximum thickness about 10% to 18% of chord length, and has its vent holes located in a region of its suction surface (50) from about 60% to 80% of the chord length from the leading edge. The impeller (16) is preferably mounted coaxially within a draft tube (10) provided with radial vanes (46).