Feed Structure for Sedimentation Vessel Slurry Distribution
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Solution Overview
Problem
Sedimentation vessels face inefficiencies due to uneven distribution of slurry, leading to suboptimal separation of solids from liquids, with existing solutions requiring complex chamber designs and additional equipment to achieve even flow and flocculation.
Innovation Solution
A feed structure comprising a feed chamber with a central wall and ports at its base, which creates a pressure differential and turbulence to ensure even slurry distribution, combined with a concentric feedwell design that directs slurry flow diagonally and radially outward, preventing short-circuiting and ensuring homogeneous distribution within the sedimentation vessel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single chamber feedwell is used to distribute slurry, then the structure is simple, but the slurry distribution becomes uneven and coarse particles settle in the chamber
Solution Approach 1:
The feedwell is divided into two separate chambers: a feed chamber for receiving slurry and a distribution chamber for even slurry release. This segmentation allows each chamber to perform its specific function optimally - the feed chamber handles incoming slurry while the distribution chamber ensures uniform distribution, solving both the simplicity and uniformity requirements
2Device complexity
If flow distribution and flocculation are combined in one chamber, then the device complexity is reduced, but the flow distribution becomes uneven and residence time is insufficient
Solution Approach 1:
The system separates flow distribution functions from flocculation functions into different chambers. The feed chamber handles flocculation with adequate residence time, while the distribution chamber handles even flow distribution. This segmentation ensures both functions perform reliably without interfering with each other
Solution Approach 2:
Flocculation is performed preliminarily in the feed chamber before the slurry enters the distribution chamber. This preliminary action ensures that flocculation occurs with sufficient residence time, and then the pre-flocculated slurry is evenly distributed in the second chamber, improving overall reliability
3Duration of action of moving object
If the outlet is positioned centrally above the floor of the first chamber, then residence time is provided, but the flow path becomes complex and energy is lost
Solution Approach 1:
The outlet is extracted from the first chamber and positioned in the second chamber instead. This allows slurry to flow horizontally from the first chamber to the second chamber, maintaining residence time in the first chamber while avoiding the energy loss associated with flowing up and over a central outlet
4Manufacturing precision
If multiple outlet structures extend from a single chamber feedwell, then slurry distribution is directed evenly, but the device complexity increases and coarse particles can settle
Solution Approach 1:
Multiple outlets are placed in the second chamber rather than extending from the first chamber. The first chamber maintains a simple single-inlet design, while the second chamber receives slurry and distributes it through multiple outlets. This segmentation achieves even distribution without adding complexity to the feedwell structure
Solution Approach 2:
The second chamber acts as an intermediary between the first chamber and the sedimentation vessel. It receives slurry from the first chamber and distributes it evenly through multiple outlets into the sedimentation vessel, mediating the flow to achieve uniformity without requiring complex outlet structures in the first chamber
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the efficiency of solid-liquid separation by ensuring even distribution of slurry, reducing the formation of 'sand islands' and improving the overall separation process, thereby increasing the effectiveness of sedimentation vessels without the need for additional equipment or complex chamber designs.
Implementation Method 1
creates a pressure differential and turbulence to ensure even slurry distribution
Implementation Method 2
creates a pressure differential and turbulence to ensure even slurry distribution
Implementation Method 3
directs slurry flow diagonally and radially outward, preventing short-circuiting and ensuring homogeneous distribution
Implementation Method 4
In sedimentation vessels, liquids and solids are separated from each other by gravity as described in principles explained by Stokes Law
Implementation Method 5
In sedimentation vessels, liquids and solids are separated from each other by gravity
Data Source
AI summary
A feed structure may be used in conjunction with a sedimentation vessel in order to separate solids and liquids, which may be in a slurry, from each other. The feed structure comprises a feed chamber housing a central wall. At least one port is positioned at the base of the chamber. A feedwell that is substantially concentric with the feed chamber is also used. The feed chamber is in communication with the feedwell, wherein slurry flows through the said port to access the feedwell. An outlet is positioned on the feedwell (such as near the bottom of the feedwell). Slurry may flow through the outlet into the sedimentation vessel.