Solid-liquid Countercurrent Contact Apparatus with Flow Control Disc
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Column-type solid-liquid countercurrent contact apparatuses face inefficiencies due to short paths of solid particles near the stirring shaft, leading to insufficient contact time and processing efficiency, as well as stagnation and backward flow of particles, which affect the uniformity and quality of processed solid particles.
Innovation Solution
The apparatus includes a column body with paddle blades and baffles, where the paddle blade diameter and width are optimized relative to the stirring chamber size, and a disc covers part of the communication opening to prevent short paths and stagnation, ensuring effective contact between solid particles and liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional stirring blade is used in the stirring chamber, then the solid particles can be stirred and mixed with the liquid, but the solid particles near the stirring shaft take a short path and discharge without sufficient contact time
Solution Approach 1:
A disc is introduced as an intermediary component between the stirring shaft and the solid particles. This disc blocks the direct short path for particles near the shaft, forcing them to take alternative routes that increase contact time with the liquid while maintaining effective mixing.
Solution Approach 2:
The disc extends the contact path in the vertical dimension by positioning itself between the stirring shaft and the particle discharge path. This dimensional addition transforms the two-dimensional radial flow near the shaft into a three-dimensional path that increases residence time.
2Productivity
If the stirring chamber is designed to maintain high throughput, then processing power is increased, but stagnation of solid particles occurs in the vicinity of the wall
Solution Approach 1:
The disc is strategically positioned to address the specific local problem of particle stagnation near the wall while maintaining overall high throughput. By locally modifying the flow path in the critical region near the stirring shaft, the invention prevents stagnation without compromising the high processing capacity of the system.
3Speed
If solid particles are rapidly moved through the stirring chamber, then processing speed is increased, but backward flow to upper connected stirring chamber occurs
Solution Approach 1:
The disc acts as a flow control intermediary that prevents backward flow to upper chambers while maintaining rapid downward progression through the stirring chamber. It selectively blocks upward movement paths while allowing controlled downward flow, ensuring unidirectional progress at high speed.
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
This configuration enhances contact efficiency by preventing short paths and stagnation, allowing for longer contact times and improved processing efficiency, particularly in washing and manufacturing processes like those for polymer particles.
Implementation Method 1
a paddle blade fixed to a shared rotating shaft which passes through the communication opening of each ring-shaped partitioning plate
Implementation Method 2
suppresses a short path of the solid particles as well as stagnation of the solid particles in the vicinity of a wall of the stirring chamber
Implementation Method 3
a disc adjacent to the paddle blade and having a size of covering at least one part of the communication opening positioned below the paddle blade
Data Source
AI summary
A column-type solid-liquid countercurrent contact apparatus, a washing apparatus for solid particles such as poly(arylene sulfide) (PAS) particles, a PAS manufacturing apparatus, a method of solid-liquid countercurrent contact, a method of washing solid particles such as PAS particles, and a method of manufacturing PAS, wherein a column top part, a column body part, and a column bottom part are included, the column body part is provided with a plurality of stirring chambers connected in the vertical direction and mutually divided by a ring-shaped partitioning plate, a paddle blade (a blade diameter/a diameter of the stirring chamber≧0.65 and the blade diameter/the diameter of the stirring chamber≦0.10) and a baffle are disposed at each of the plurality of stirring chambers, and a disc having a size covering at least a part of a communication opening positioned below the paddle blade is attached to a rotating shaft or to the paddle blade.