Countercurrent Extraction Chamber Layout for Stable Concentration Gradients
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Solution Overview
Problem
In current countercurrent extraction processes for chemical fibers, the extraction liquid flows in uncertain directions, leading to concentration gradients being decreased due to mixing between adjacent extraction tanks, which affects the extraction efficiency.
Innovation Solution
A countercurrent extraction device with partition assemblies that create distinct extraction chambers, allowing extraction liquid to flow unidirectionally through these chambers, maintaining concentration gradients and using rollers with external rotation bearings and sealing assemblies to prevent mixing and lubricant loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a partition plate with liquid-passing holes is used between extraction tanks, then the extraction liquid can flow between tanks, but the extraction liquid may flow back from adjacent through-holes and mix with previous extraction tank liquid, decreasing concentration gradient
Solution Approach 1:
The partition plate is segmented into multiple through-holes arranged in rows, with each through-hole serving as an independent liquid passage. This segmentation allows controlled liquid flow while preventing backflow between adjacent tanks, maintaining concentration gradients.
Solution Approach 2:
The partition plate acts as an intermediary structure between adjacent extraction tanks, providing controlled liquid passage through its through-holes while blocking direct contact and backflow between tanks, thus maintaining concentration gradients.
2Productivity
If the extraction liquid flows through multiple extraction tanks in countercurrent direction, then the extraction effect is improved, but the extraction liquid flow direction becomes uncertain after passing through liquid-passing holes, causing mixing
Solution Approach 1:
The through-holes in the partition plate are arranged asymmetrically in rows, creating a unidirectional flow pattern that guides the extraction liquid through the tanks in a controlled countercurrent direction, preventing uncertain flow paths and backflow.
3Extent of automation
If conveying rollers are used to move fiber between extraction tanks, then the extraction process can be automated, but the rollers may be exposed to extraction liquid, causing lubricant loss and maintenance issues
Solution Approach 1:
The rotation bearings are extracted from the extraction tank interior and mounted on the external wall, separating the lubricated rotating components from the extraction liquid environment. This prevents lubricant loss while maintaining automated conveying functionality.
Solution Approach 2:
The sealing assembly acts as an intermediary barrier between the extraction liquid and the rotation bearing, allowing the bearing to rotate externally while preventing liquid penetration and lubricant loss.
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 device ensures unidirectional extraction liquid flow, maintains concentration gradients, and reduces the risk of lubricant loss, thereby enhancing extraction efficiency and facilitating maintenance.
Implementation Method 1
a liquid cavity, configured for unidirectional flow of extraction liquid from bottom to top, is provided between the first plate and the second plate in each of the plurality of partition assemblies
Implementation Method 2
The extraction liquid may contact with the first plate during continuous flowing, and only flow from the lower side of the first plate to the second plate due to a blocking effect
Implementation Method 3
the extraction liquid can only flow to the next extraction chamber unidirectionally due to a high liquid level of a front extraction chamber
Data Source
AI summary
A countercurrent extraction device for spinning includes an extraction box containing extraction liquid, and the extraction box is provided with a plurality of partition assemblies, and the extraction box is partitioned into a plurality of extraction chambers by the partition assemblies; each of the partition assemblies includes a first plate and a second plate, two ends of the first plate are fixedly connected to two sidewalls of the extraction box, and a first gap is provided between a lower edge of the first plate and a bottom wall of the extraction box; a lower edge of the second plate is connected to the bottom wall of the extraction box, a second gap is provided between a top edge of the second plate and a top wall of the extraction box, and heights of a plurality of second plates are gradually decreased along a flow direction of the extraction liquid.