Twisted Plates in Clarifier Feedwell for Energy Dissipation
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Solution Overview
Problem
Existing clarifier feedwells fail to adequately dissipate entrance energy of feed slurry, leading to incomplete mixture separation and reduced clarity of separated liquids due to high velocity and turbulence, which hinders the settling of solids.
Innovation Solution
The use of twisted plates in the feedwell, positioned to oppose the flow direction, gradually increasing surface area and reducing velocity without increasing turbulence or shear force, facilitates plug flow and enhanced settling of solids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If feed slurry is pumped into the feedwell at high velocity to process material efficiently, then productivity is improved, but turbulence and shear force increase which worsens the separation quality
Solution Approach 1:
The feedwell acts as an intermediary structure between the high-velocity feed slurry inlet and the settling zone. It receives the high-velocity feed slurry and transforms it into plug flow with uniform velocity through its specific geometry, serving as a mediator that decouples the high productivity inlet flow from the low turbulence settling zone requirements
Solution Approach 2:
The feedwell changes the flow parameters from high velocity and turbulent flow at the inlet to uniform velocity and plug flow in the settling zone. This parameter transformation is achieved through the feedwell's geometric design that converts kinetic energy into flow uniformity, maintaining productivity while improving separation quality
2Manufacturing precision
If the feedwell velocity is reduced to improve separation, then separation quality improves, but productivity decreases due to slower material processing
Solution Approach 1:
The feedwell is segmented into distinct functional zones: an upper zone that receives and distributes feed slurry, and a lower settling zone. This segmentation allows the upper zone to handle high-velocity feed while the lower zone provides a quiet settling environment, decoupling the speed requirements of different zones
Solution Approach 2:
The feedwell design transitions from horizontal high-velocity flow at the inlet to vertical plug flow in the settling zone. This dimensional change from horizontal to vertical flow direction allows the system to maintain high productivity at the inlet while achieving effective settling in the vertical dimension
3Loss of energy
If vertically oriented plates are used in the feedwell to dissipate energy, then entrance energy is reduced, but turbulence and shear force increase which worsens settling
Solution Approach 1:
The feedwell employs a curved or rounded internal geometry instead of sharp-edged vertical plates. This curved design smoothly guides the feed slurry flow and dissipates entrance energy through gradual curvature rather than abrupt plate surfaces, reducing turbulence and shear force generation while maintaining energy dissipation
Solution Approach 2:
The invention replaces the mechanical plate structure with a geometric flow guidance system. Instead of using physical plates to block and redirect flow, the feedwell uses its contoured internal shape to naturally guide and dissipate flow energy, substituting mechanical interference with geometric flow management
Data Source
AI summary
A feedwell design for a clarifier that may better dissipate the entrance energy of feed slurry liquid exiting the feedwell and entering the clarifier. Plates having a surface area twisted around a longitudinal axis may be provided at the bottom of the feedwell. The plates may cause a change in the flow direction of the feed, from being mostly horizontal to mostly vertical, to slow the slurry. The provision of plates at the bottom of a feedwell in a clarifier may advantageously reduce the velocity of the materials entering the clarifier, or may increase the uniformity of the flow rate of the materials while reducing or maintaining the amount of shear force, turbulence, or other forces that may have a detrimental effect on clarification. Likewise, this may improve the rate at which solids settle out of the feed slurry solution, and thus improve the clarity of the removed liquid.