Low-Shear Dynamic Swirling Element for Stable Cyclone Separation
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Solution Overview
Problem
Dynamic cyclone separators experience strong shear emulsification due to rapid increases in tangential velocity, leading to decreased separation efficiency and difficulty in maintaining stable operation.
Innovation Solution
A low-shear dynamic swirling element design with a rotating hub and blades, utilizing a three-stage design concept involving an inlet, middle, and outlet section, where alignment lines are smoothed by a third-order Bezier curve, and angles are coordinated to control swirling flow strength and reduce shear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the tangential velocity of fluid is rapidly increased in dynamic cyclone separator, then the swirling flow strength is improved, but shear emulsification occurs causing dispersed-phase droplet crushing
Solution Approach 1:
The blade lattice structure is designed to rotate dynamically, allowing the tangential velocity to increase gradually from the inlet to the outlet along the flow direction. This dynamic velocity profile reduces sudden shear changes while maintaining effective swirling flow for separation, resolving the contradiction between achieving high swirling strength and avoiding shear emulsification of dispersed phase droplets
Solution Approach 2:
The patent changes the velocity parameter distribution along the flow path by designing the blade lattice geometry such that the tangential velocity increases progressively rather than abruptly. This parameter transformation from constant/high velocity to gradually increasing velocity eliminates the harmful shear effects while preserving the necessary centrifugal force for separation
2Adaptability or versatility
If a rotating drum is used as swirling element, then the structure can drive fluid to generate swirling flow and serve as separation chamber, but the structure becomes more complex and difficult to maintain
Solution Approach 1:
The rotating drum structure is segmented into a stationary hub and a rotating blade lattice assembly. The blade lattice can be detached and replaced independently, simplifying maintenance and reducing overall structural complexity while retaining the ability to generate effective swirling flow for separation
Solution Approach 2:
The blade lattice is extracted as a separate, removable component from the drum structure. This allows the complex swirling flow generation function to be isolated in a maintainable module that can be easily replaced without dismantling the entire separator, thus reducing maintenance difficulty while preserving adaptability
3Productivity
If the drum size is increased to improve single equipment throughput, then the maximum throughput is limited by the drum size constraint
Solution Approach 1:
The patent transitions from a two-dimensional drum cross-section to a three-dimensional rotating blade lattice structure with axial extension. This dimensional change allows the separator to achieve higher throughput by utilizing the axial dimension for extended separation path length, effectively increasing capacity without proportionally increasing the drum footprint
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
Achieves low-shear and low-disturbance swirling, preventing dispersed-phase droplet crushing and enhancing separation efficiency and stability, allowing for controlled swirling flow strength based on material characteristics.
Implementation Method 1
the rotating blade lattice drives the fluid to produce a rotation... the strength of the swirling flow can be effectively controlled according to the characteristics of a material to be separated
Implementation Method 2
the energy requrired for the fluid to form a swirling flow is derived from the pressure differential of the fluid
Implementation Method 3
Removal of light components with low density is an important part of wastewater treatment process... oil-containing wastewater treatment
Data Source
Figure 1~2
Figure 3~4
AI summary
Provided is a design method for a low-shear dynamic swirling element (100). The low-shear dynamic swirling element (100) comprises a rotating hub (102) and a plurality of blades (101) uniformly distributed in the circumferential direction of the rotating hub (102); each blade (101) comprises an inlet section (106), a middle section (107), and an outlet section (108) that are sequentially connected; the middle section (107) is separately tangent to the inlet section (106) and the outlet section (108). The low-shear dynamic swirling element (100) can realize low-shear and low-disturbance dynamic swirling, and avoid dispersed-phase droplet crushing caused by a rapid change of the tangential speed of a fluid. Moreover, the strength of the swirling flow can be effectively controlled according to the characteristics of a material to be separated, and the applicability and the stable operation interval of a centrifugal or dynamic swirling separation device are effectively improved.