Distribution Array for Mixer-Settler Flow Control
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Solution Overview
Problem
Conventional mixer-settlers in solvent extraction face challenges in achieving even fluid distribution, leading to recirculating zones, dead zones, and increased solvent losses due to turbulent flow, which results in inefficient separation and higher operating costs.
Innovation Solution
A distribution array with linearly-spaced barrier elements that create fluid flow channels longer than they are wide, offset to form a tortuous path, reducing transverse momentum and ensuring even flow distribution across the settler area with minimal dynamic head loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional distribution systems (baffles, deflector plates, split launders) are used to distribute flow in mixer-settlers, then flow distribution is attempted, but recirculating zones and dead zones are created within the settler
Solution Approach 1:
The distribution array segments the feed stream into multiple discrete flow channels using vertically-spaced bars. This segmentation prevents the formation of large recirculating zones by dividing the flow into controlled pathways, allowing each channel to distribute flow evenly across the settler width without creating dead zones.
Solution Approach 2:
The invention introduces a vertical dimension to flow distribution by positioning bars at different heights within the settler. This multi-level arrangement creates tortuous flow paths that descend through the settler, distributing feed across the full width while eliminating the horizontal recirculating patterns caused by conventional single-plane distribution systems.
2Productivity
If high flow rates are achieved in the settler, then throughput is increased, but turbulent flow occurs leading to co-mixing of phases and reduced extraction efficiency
Solution Approach 1:
The distribution array creates curved, tortuous flow paths as feed descends through the vertically-spaced bars. This curved flow geometry dissipates kinetic energy and reduces turbulence intensity, allowing high throughput rates to be maintained while preventing phase co-mixing and maintaining extraction efficiency.
3Area of stationary object
If feed is distributed to both sides of the settler with 90° flow turns, then full width distribution is achieved, but recirculating zones are created
Solution Approach 1:
The distribution array performs preliminary flow distribution at the feed entry point by immediately directing flow through vertically-spaced bars. This preliminary action distributes feed across the full settler width before the phases have a chance to separate and recirculate, preventing dead zones from forming in the first place rather than attempting to correct distribution issues downstream.
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 achieves even fluid distribution across the settler area, reducing recirculating zones and solvent losses, increasing throughput, and minimizing the required settler area, thereby enhancing extraction efficiency and reducing operational costs.
Implementation Method 1
The flow of liquids needs to be as laminar as possible, as flow interruptions or turbulence can lead to co-mixing of phases
Implementation Method 2
a quiescent settling stage, usually in the form of a gravity settling basin (settler) that allows the phases to separate by gravity
Implementation Method 3
allows the phases to separate by gravity
Implementation Method 4
The flow of liquids needs to be as laminar as possible, as flow interruptions or turbulence can lead to co-mixing of phases
Data Source
AI summary
A distribution array (10) for use in a settler area (12) of a mixer-settler, the distribution array (10) characterized by: at least one panel (26, 28) of linearly-spaced barrier elements (30), wherein the depth of the barrier elements (30), relative to a length of the settler area (12) in which it is to be positioned, is greater than the spacing between the barrier elements (30), thereby defining a fluid flow channel between adjacent barrier elements (30) that is longer than it is wide.