Hydrocyclone Discharge Channel Geometry for Separation Stability
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Solution Overview
Problem
Current separating cyclones, such as hydrocyclones, face inefficiencies in separating light and heavy fractions due to excessive entrainment of heavy fraction with the light fraction, leading to unstable operation and reduced separating efficiency, with 20 to 50 times the volume of heavy fraction being required to achieve reasonable separation.
Innovation Solution
A separating cyclone design featuring a cyclone tube with a rotation generating unit, a flow body with a light fraction discharge channel having a cross-section decreasing in the flow direction, and pressure control elements to adjust the flow rates of both fractions, ensuring the interface between the heavy and light fractions contacts the discharge channel, thereby minimizing heavy fraction entrainment and enhancing separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydrocyclone design is used, then stable operation is achieved, but heavy fraction is excessively discharged with light fraction (20-50 times volume ratio)
Solution Approach 1:
The patent changes the geometric parameters of the discharge channel by providing a conical portion with decreasing cross-section in flow direction. This parameter modification allows the interface between light and heavy fractions to contact the inner side of the discharge channel, thereby reducing heavy fraction entrainment from 20-50 times volume ratio to minimal levels while maintaining stable operation.
2Device complexity
If conventional discharge channel design is used, then simple structure is maintained, but separating efficiency is reduced due to heavy fraction entrainment
Solution Approach 1:
The discharge channel is segmented into different portions: a conical portion with decreasing cross-section and a cylindrical portion with constant cross-section. This segmentation allows the interface contact function to be localized in the conical portion while maintaining simple cylindrical structure downstream, achieving both structural simplicity and high separating efficiency.
3Ease of operation
If interface position is not controlled, then device operation is simple, but separation stability is poor
Solution Approach 1:
The conical portion of the discharge channel is designed to automatically position the interface between light and heavy fractions against its inner side through the natural flow dynamics and geometric constraints. This self-positioning mechanism eliminates the need for external control devices while ensuring stable separation, achieving both operational simplicity and separation stability.
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 design significantly reduces the amount of heavy fraction entrained with the light fraction, stabilizes the cyclone operation, and improves separating efficiency, allowing for precise adjustment of the interface and efficient discharge of light fraction with minimal heavy fraction contamination.
Implementation Method 1
As a result of the tangential inlet the incoming mixture is set into rotation. Because of the difference in density between the light fraction and heavy fraction the light phase will be displaced to a central region in the middle of the cyclone, while the heavy fraction is displaced under the influence of centrifugal forces to a peripheral region close to the inner surface of the cyclone tube.
Implementation Method 2
The discharge channel has in flow direction a cross-section substantially decreasing along at least a portion of the length of the discharge channel. By adjusting the valves the position of the interface between the above-mentioned central region, in which the light fraction is situated, and the peripheral region, in which the heavy fraction is located, can be adjusted as required.
Data Source
AI summary
The present invention relates to a separating cyclone for separating a mixture of liquids into a heavy fraction, the cyclone comprising:—a cyclone tube (2) in which a flow space is defined, wherein the cyclone tube is provided with an inlet for infeed of a mixture of at least two different liquids, a heavy fraction outlet for discharging the heavy fraction separated from the mixture and a light fraction outlet for discharging the light fraction separated from the mixture;—a rotation generating unit (8) for setting into rotation the mixture fed in via the inlet;—a flow body (6) arranged substantially concentrically in the cyclone tube, in which body is provided a light fraction discharge channel (12) connected to the light fraction discharge, wherein the discharge channel has in flow direction a cross-section substantially decreasing along at least a portion of the length thereof.