Helicoidal Filter Assembly for Slurry Sampling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing filtration systems for industrial processes, such as hydrometallurgical processes, face challenges in maintaining continuous operation due to rapid cake deposition on filter surfaces, requiring frequent replacement of filter media and not providing real-time, solid-free samples for on-stream analysis.
Innovation Solution
A filtering apparatus with a flexible filter cartridge made of textile or web materials like polypropylene or polyamide, designed to induce a shear-cleansing current and prevent cake formation, featuring a helicoidal flow pattern and a solid filler rod to minimize dead volume and facilitate easy maintenance, allowing for continuous operation and extended maintenance intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If cross-flow filtration with high velocity fluid passage is used to prevent cake deposition, then cake formation is reduced, but fast cake deposition still occurs and frequent filter media replacement is required
Solution Approach 1:
The filter surface is designed with a curved, helical geometry instead of a flat surface. The slurry flows in a helical path along the curved filter surface, which enhances the scouring action and prevents cake deposition more effectively than linear cross-flow. This curvature-induced flow pattern maintains continuous cleaning action throughout the filtration process.
Solution Approach 2:
The system utilizes dynamic flow conditions where the slurry velocity and flow direction continuously change along the helical path. This dynamic flow regime creates varying shear forces that actively prevent cake formation, transforming the static filtration process into a dynamically self-cleaning system.
2Ease of operation
If filter cartridge is designed for easy maintenance and replacement, then ease of operation is improved, but device complexity may increase
Solution Approach 1:
The filtration system is divided into modular segments: a removable filter cartridge housed within a stationary housing. The cartridge can be independently extracted and replaced without disassembling the entire filtration unit. This segmentation allows quick maintenance while keeping the overall device structure relatively simple through standardized interfaces.
Solution Approach 2:
The filter cartridge is nested within the filter housing, with the cartridge fitting into a dedicated cavity. This nested arrangement allows the cartridge to be easily inserted and removed from the housing without requiring complex assembly or disassembly operations, simplifying maintenance while maintaining structural integrity.
3Measurement precision
If dead volume is minimized to reduce sample accumulation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Dead volume spaces within the filter cavity are eliminated by strategically positioning the filter cartridge and filler rod to occupy all available void spaces. The filler rod extends to fill gaps between the cartridge and housing, extracting unnecessary volume that would otherwise trap stagnant liquid and cause sample composition changes.
Solution Approach 2:
The filter cartridge employs a flexible membrane or thin-walled construction that conforms to the cavity shape, eliminating gaps and dead zones. This flexible design allows the cartridge to fully engage with the housing geometry, minimizing stagnant regions while maintaining structural integrity and filtration function.
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
The apparatus provides reliable, continuous on-line sampling for several weeks with minimal sample accumulation, ensuring real-time representation of process conditions and reducing the need for frequent filter media replacement.
Implementation Method 1
The slurry has velocity that generates scouring and cleaning action on the filter media thus preventing cake formation on the filter
Implementation Method 2
The slurry has velocity that generates scouring and cleaning action on the filter media thus preventing cake formation on the filter
Implementation Method 3
The process flow having kinetic energy is fed into a filter chamber so as to provide a helicoidal flow pattern of the slurry on a surface of a filter media
Implementation Method 4
The process flow having kinetic energy is fed into a filter chamber so as to provide a helicoidal flow pattern of the slurry on a surface of a filter media
Data Source
AI summary
A filter assembly is provided for obtaining a filtered liquid sample from slurry, such as a liquid process stream that contains liquid, dissolved matter and solids. A housing defines a cavity. A rod is arranged in the cavity and supports a filter. A cartridge comprises the filter, and is arranged between the housing and the rod. Furthermore, there is a helicoidal passage for a slurry defined by the housing and the cartridge. There is also a cavity defined by the rod and the cartridge. The slurry has velocity that generates scouring and cleaning action on the filter media thus preventing cake formation on the filter. The filtering apparatus of the present invention provides reliable and continuous on-line sample delivery for an analyzer.