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US 4,882,098 AGranted
Mass transfer mixing system especially for gas dispersion in liquids or liquid suspensions
AssigneeGeneral Signal Corporation
InventorRonald J. Weetman
Life of this patent
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AssigneeGeneral Signal Corporation
InventorRonald J. Weetman
Estimating the term…
A mixing system for dispersing gas or other fluids in liquid which may have a solid suspension so as to improve mass transfer to the liquid or its solids suspension while maintaining a low pattern which is substantially axial (up and down) in the tank containing the liquid thereby also facilitating mixing (blending) utilizes an (unshrouded) axial flow impeller which provides the desired single stage axial flow downwardly to the bottom of the tank and upwardly along the sidewalls of the tank with radial flow confined principally to the bottom region of the tank. A sparge system which releases the gas or other fluid in the region at the bottom of the tank where the flow is predominantly radial allows attainment of gas rates with complete dispersion of gas throughout the tank which rates are much higher (about four times as great) as when conventional sparge systems are used with axial flow impellers.
A mixing system for dispersing a fluid into a liquid which can have solids suspended therein which comprises a tank having a bottom and side walls which extend axially of said tank, said tank containing the liquid to a level above the bottom of said tank, a drive to turn an impeller, impeller means for providing a recirculating, axial flow pattern having principally axial flow components upwardly and downwardly between the bottom of the tank and the level of the liquid therein and a radial flow component in the direction across the bottom of said tank toward the side walls thereof, the outlet flow from said impeller means being a predominately axial flow downwardly towards the bottom of said tank and a predominately radial flow towards the side walls of said tank, means for releasing said fluid in said outlet flow outside where said flow is axial and in said radial flow which is inside where said flow is radial, whereby said fluid is unable to oppose said axial outward flow, said releasing means being in a region of said tank which extends between the bottom of said tank and a plane through said impeller means which plane is perpendicular to the axial direction.
Dependencies are inferred from the claim text.