Method to enhance clarification in a mixing reactor and said mixing reactor
AssigneeOutotec Oyj
InventorsLauno Lilja, Bror Nyman
Life of this patent
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Abstract
The invention relates to a mixing reactor for mixing a liquid and pulverous solid, clarification the solution that is formed and discharging the clarified solution from the mixing reactor, in the lower section of which a fluidized bed is formed. The invention also relates to a method for mixing a liquid and pulverous solid into each other in a fluidized bed, for clarification the solution that is formed and for discharging the clarified solution from the mixing reactor.
Claims20
A mixing reactor (12) for mixing a liquid and a solid into each other in a fluidized bed, for clarification the solution that is formed and discharging the clarified solution from the reactor, whereby the reactor is composed of three sections, the lowermost of which is essentially a cylindrical reaction section (14) for the formation of a fluidized bed, attached to the upper part of the reaction section is a calming section (18) which widens conically upwards, and connected to the upper part of the latter there is a cylindrical clarification section (22), the diameter of which is the same as the upper section of the calming section, characterised in that the lower section of the reaction section (14) is equipped with a solution feed connection (13) and the clarification section (22) has a solution discharge unit (23,32) located below the liquid surface (E), the discharge opening (24,33) of which is essentially on the central axis of the reactor (D), and that at least one guiding element (25,26,27,34) for directing the solution flow is located in the vicinity of the discharge opening.
A method for mixing a liquid and pulverous solid into each other, for clarification the solution that is formed and for removing the clarified solution from a mixing reactor, whereby a fluidized bed is arranged in the reaction zone (I) of the lower section of the reactor, formed of a liquid and solids, with a calming zone (II) above it, with a cross-section that widens upwards, and a clarification zone (III) above this, which has the same cross-sectional area as the upper section of the calming zone (II), characterised in that the liquid to be treated is fed into the lower section of the reaction zone, the cross-sectional area of the solution flow rising upwards in the clarification zone (III) is made to expand by means of at least one guiding element (A) before the solution is discharged mainly via the discharge unit (B) located on the central axis (D) of the reactor, the flow rate of the solution is made to slow down by expanding its cross-sectional area and at the same time the flow is made to form back eddies in the vicinity of the reactor wall, into which the solid particles that have traveled along with the solution settle and fall back to the fluidized bed.
Dependencies are inferred from the claim text.