Centrifuge Disc Stack Electrostatic Charging
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Solution Overview
Problem
Existing centrifuge technologies face challenges in achieving continuous operation while effectively separating particles from liquids due to electrostatic charging limitations and clogging issues in disk packs, leading to inefficient particle separation and frequent maintenance.
Innovation Solution
A centrifuge with a vertically rotating drum and a disk pack that uses electrostatic charging to attract particles to the plates, allowing for continuous operation and improved separation by generating an electrical charge on the plates using a DC voltage source, with controlled discharge of solids via piston-valved openings, preventing re-entrainment of separated particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional centrifuge with a disc pack is used for particle separation, then continuous operation is possible, but particle separation efficiency is insufficient due to lack of electrostatic attraction
Solution Approach 1:
The invention merges two separation mechanisms: centrifugal force and electrostatic attraction. The disc pack is electrically charged to create electrostatic attraction forces that work together with centrifugal forces to enhance particle separation efficiency while maintaining continuous operation capability.
Solution Approach 2:
The disc pack is transformed into a composite structure with both mechanical function (centrifugal separation) and electrical function (electrostatic attraction). By charging the discs, the system creates a multi-functional separation medium that addresses both continuous operation and improved separation efficiency.
2Manufacturing precision
If electrostatic charging is applied to enhance particle attraction, then separation efficiency improves, but device complexity increases due to additional charging mechanisms
Solution Approach 1:
The disc pack serves multiple functions: it provides the mechanical structure for centrifugal separation and simultaneously acts as an electrostatic charging element. This multi-functionality reduces the need for separate charging mechanisms and simplifies the overall device structure.
Solution Approach 2:
The disc pack charges itself through the applied voltage, creating electrostatic attraction without requiring additional active control systems. The system automatically maintains the electrostatic field as long as voltage is applied, reducing operational complexity.
3Manufacturing precision
If particles are attracted to plates in the disc pack, then separation efficiency improves, but particles may become re-entrained in the product stream
Solution Approach 1:
The voltage polarity is periodically reversed during operation. During the first polarity phase, particles are attracted to and deposited on the plates. During the reversal phase, deposited particles are released and collected in the solids collection chamber, preventing re-entrainment in the product stream.
Solution Approach 2:
Particles are first deposited on the plates during the initial polarity phase before being collected. This preliminary deposition separates particles from the liquid stream, and the subsequent polarity reversal ensures complete collection without re-entrainment.
4Manufacturing precision
If the disc pack is continuously charged for separation, then separation efficiency is maintained, but energy consumption increases
Solution Approach 1:
The voltage is applied periodically rather than continuously. The system alternates between charging phases (for separation) and discharge phases (for particle collection), reducing overall energy consumption while maintaining continuous operation and separation efficiency.
Solution Approach 2:
The periodic polarity reversal ensures that the separation process continues without interruption. While one set of discs is collecting particles, other discs are performing separation, maintaining continuous useful action with reduced energy input compared to continuous charging of all discs.
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
Enhances particle separation efficiency by utilizing electrostatic forces within the centrifugal field, preventing re-entrainment of separated particles and enabling continuous operation with reduced maintenance needs.
Implementation Method 1
Generating an electrical charge on the discs of the disc stack
Implementation Method 2
particles in this product are attracted more strongly by electrically charged components
Implementation Method 3
separating the charged particles from the free-flowing product within the disc stack, and continuously removing the solid phase
Data Source
Figure 1
AI summary
A method for processing a flowable product (P) using a centrifuge, in particular a separator, comprising a vertical axis of rotation (D) having a rotatable centrifuge drum (1) in which a disc stack (11) is arranged, at least one product outlet (13) for discharging at least one liquid phase (LP) and at least one solids discharge opening (10) for discharging a solid phase (SP), characterized by the following steps: a) pretreating the flowable product (P) so that particles in said product are more strongly attracted by electrically charged components; a) feeding the flowable product (P) into the disc stack (11); b) generating an electric charge on the discs in the disc stack (11) and c) separating the charged particles out of the flowable product (P) within the disc stack (11) under the influence of the electrostatic attractive forces and a centrifugal field and a centrifuge.