Rotary Precoat Filter Layout for Particle-Free Suspension Filtration
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Solution Overview
Problem
Existing rotary filter systems for liquid filtration allow some mineral and organic particles from the pre-layer to migrate into the filtered liquid, posing contamination risks in critical applications like polymer plate etching baths for flexographic printing, biological fluids, and medicinal products, where purity is essential.
Innovation Solution
A rotary pre-coated filter installation with separate units for pre-layer preparation and filtration, featuring automatic movement and scraping mechanisms, ensuring the pre-layer formation and filtration are isolated, and using independent suspension preparation to prevent particle contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rotary precoat filter is used for filtration, then continuous filtration and high productivity are achieved, but the filter cake must be completely removed before each new coating which causes loss of time and reduced productivity
Solution Approach 1:
The patent applies preliminary action by using a washing solvent to pre-wash and loosen the filter cake before the main removal process. This preliminary treatment facilitates easier and faster complete removal of the filter cake, reducing the time loss between filtration cycles while maintaining continuous filtration productivity.
Solution Approach 2:
The patent introduces a washing solvent as an intermediary substance between the filter cake and the removal mechanism. This solvent acts as a mediator that penetrates and loosens the filter cake structure, making it easier to remove completely without damaging the underlying filter medium, thereby reducing removal time.
2Productivity
If a washing solvent is introduced to facilitate filter cake removal, then removal is easier and faster, but the solvent may penetrate to the filter medium and dissolve adhering product causing contamination and loss of substance
Solution Approach 1:
The patent applies local quality by concentrating the washing solvent application specifically at the interface between the filter cake and the filter medium, rather than allowing uniform penetration throughout. This localized treatment loosens the filter cake for easier removal while minimizing solvent penetration to the filter medium and dissolved product loss.
Solution Approach 2:
The patent replaces purely mechanical removal methods with a chemical-assisted approach using washing solvent. This substitution enables faster and easier filter cake removal through chemical loosening, while the controlled application method prevents excessive solvent penetration that would cause product dissolution and loss.
3Productivity
If the filter cake is not completely removed before new coating, then productivity is improved by avoiding downtime, but the quality of the new filter cake layer is compromised
Solution Approach 1:
The patent implements feedback by using a level sensor to detect the presence and thickness of the filter cake on the filter medium. This feedback mechanism ensures that the filter cake is completely removed before a new coating is applied, maintaining the quality and integrity of the new filter cake layer while enabling continuous operation without compromising filtration performance.
Solution Approach 2:
The patent applies self-service by designing an automated system where the washing solvent application and filter cake removal process is self-regulating. The system automatically determines when the filter cake is sufficiently loosened and ready for removal, ensuring complete clearance before new coating without requiring manual intervention that could compromise quality.
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
Guarantees the purity of filtered liquids by preventing solid particles from the pre-layer from entering the filtered liquid, maintaining high purity standards in critical applications.
Implementation Method 1
there is always a risk that the washing solvent will penetrate to the filter medium and dissolve product adhering thereto
Implementation Method 2
facilitates removal of the filter cake from the filter medium
Implementation Method 3
Equipment for the filtration of a suspension using a rotary precoat filter
Data Source
Figure 1
AI summary
The invention relates to equipment (1) for the filtration of a suspension (5) using a rotary filter (2) comprising a precoat (20), said equipment comprising a filtration unit (3) intended for the implementation of said rotary filter (2). It is characterized in that it further comprises a coating unit (16) for coating the rotary filter (2) with the precoat (20), said coating unit (16) being independent of said filtration unit (3).