Spiral Crossflow Filter Segmented Channels
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Solution Overview
Problem
Existing cross-flow filter devices face challenges with blinding and reduced effectiveness due to accumulation of retentate, particularly at high solids loads, which limits their continuous operation and efficiency.
Innovation Solution
A spiral cross-flow filter design featuring an outer cylindrical shell, a coaxially aligned permeate tube, and an annular pleated filter element with composite materials, including membrane and spacer layers, and a corrugated feed spacer to maintain flow separation and prevent fouling, allowing for higher cross-flow rates and reduced blinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If crossflow filtration is used to handle high solids loads, then the filter can operate continuously with reduced blinding, but the accumulation of retentate still causes fouling and reduced effectiveness
Solution Approach 1:
The filter element is segmented into multiple channels formed by corrugated feed spacers and permeate spacers, creating distinct flow paths that prevent retentate accumulation in single locations. The pleated membrane is also segmented into multiple filtration surfaces arranged in parallel channels, allowing continuous operation without complete fouling of the entire filter surface.
Solution Approach 2:
The filter design incorporates dynamic flow distribution through the corrugated feed spacer structure that promotes turbulent flow and prevents dead zones where retentate could accumulate. The spiral configuration with multiple channels creates dynamic flow patterns that continuously scour the membrane surface, maintaining filtration effectiveness over extended operation periods.
2Object-affected harmful factors
If tangential feed flow is used to remove trapped particles, then blinding is reduced, but flow separation and fouling prevention require complex spacer structures
Solution Approach 1:
The feed spacer and permeate spacer are constructed as thin, flexible corrugated structures that can be easily formed and assembled. These thin-film spacers create the necessary flow channels and maintain separation without requiring complex rigid structures, reducing manufacturing complexity while achieving effective flow distribution and fouling prevention.
Solution Approach 2:
The corrugated spacers feature curved wave patterns that naturally guide flow in a tangential direction across the membrane surface. This curved geometry inherently promotes the crossflow needed to prevent blinding without requiring additional mechanical components, simplifying the overall structure while maintaining effective particle removal.
3Reliability
If multiple layers of membrane and spacer materials are used, then flow separation and fouling prevention are improved, but manufacturing complexity increases
Solution Approach 1:
The feed spacer and permeate spacer are combined with the membrane in a single integrated assembly process. The corrugated spacers are positioned and bonded directly to the membrane surfaces in one manufacturing step, eliminating separate assembly operations for each layer and reducing overall manufacturing complexity despite the multi-layer construction.
Solution Approach 2:
The filter element uses composite construction with corrugated feed spacer material, permeate spacer material, and membrane material bonded together to form a unified structure. This composite approach allows the different functional layers to be manufactured separately using optimized processes for each material type, then assembled into the final multi-layer structure with improved ease of manufacture.
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 design enables continuous operation with reduced blinding and improved handling of high solids loads, maintaining filter effectiveness by preventing fouling and allowing for higher cross-flow rates and viscosity fluids processing.
Implementation Method 1
Material which is smaller than the membrane pore size passes through the membrane as filtrate
Implementation Method 2
the tangential motion of the bulk of the fluid across the membrane causes trapped particles on the filter surface to be removed by the tangential feed flow
Implementation Method 3
the feed is passed across the filter membrane (tangentially to the filter membrane) at some pressure, concentration, or other differential between the feed and the filtrate
Data Source
AI summary
The present disclosure describes a spiral cross-flow filter. The spiral cross-flow filter includes a filter element having a continuous web of leaves formed by pleating a laminate filter element. The filter element may include a composite filter material including a first layer of a membrane material adjacent an outer shell, and a second layer of a permeate spacer material adjacent a permeate tube. The plurality of leaves wrap around the permeate tube in a uniform “spiral” configuration and may be separated by feed spacers.