Flushable Filter System Managing Pressure Spikes
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Solution Overview
Problem
Conventional liquid purification filter systems face issues with premature membrane rupture due to fouling from high particulate levels and pressure spikes caused by repetitive ON/OFF cycling, leading to loss of filter integrity and efficiency.
Innovation Solution
A flushable filter system with multiple filter units that can be forward flushed, back flushed, or flushed simultaneously, using unpurified liquid to clean the filters while maintaining purification in the other unit, thereby reducing mechanical stress and extending membrane life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hollow fiber membranes are used to increase filter surface area in a given space, then filtration efficiency is improved, but the membranes become more prone to rupture and collapse when pressure differential exceeds limits
Solution Approach 1:
The system divides the filtration function into multiple independent filter units (first filter unit, second filter unit), each with its own hollow fiber membranes. This segmentation allows the system to maintain high total surface area while distributing pressure loads across separate units, preventing catastrophic failure of the entire system when one unit experiences pressure spikes.
Solution Approach 2:
The system performs preliminary flushing actions (forward flush, back flush, or both) on filter units before they become severely fouled. By periodically cleaning the membranes with flush ports, the system prevents excessive pressure differential buildup that would otherwise lead to membrane rupture, thereby maintaining membrane integrity while preserving filtration efficiency.
2Adaptability or versatility
If the filter operates in high particulate environments, then it can handle harsh conditions, but the filter becomes fouled quickly requiring frequent replacement
Solution Approach 1:
The system implements periodic flushing cycles (forward flush, back flush, or both) to clean the hollow fiber membranes at regular intervals. This periodic cleaning action removes accumulated particulates and fouling materials before they can severely clog the pores, thereby extending the service life of the filter while maintaining the ability to operate in harsh, high-particulate environments.
Solution Approach 2:
The filter system performs self-cleaning through the flush ports that allow unpurified liquid or purified liquid to flow through the membranes in reverse or forward directions. This self-service flushing mechanism eliminates the need for external cleaning equipment or frequent manual replacements, allowing the filter to maintain performance in harsh conditions over extended periods.
3Adaptability or versatility
If repetitive ON/OFF cycling occurs to meet cyclic demand, then the system adapts to variable usage, but pressure spikes from water hammer effect damage the membrane
Solution Approach 1:
The system provides beforehand cushioning by having multiple filter units available and using flushing operations to prepare the membranes before they are subjected to pressure spikes. The flush ports and valve system are pre-configured to可以快速 respond to pressure changes, and the redundant filter unit arrangement cushions against the full impact of water hammer effects, protecting membrane integrity during cyclic ON/OFF operation.
Solution Approach 2:
The system changes operational parameters by switching between different flushing modes (forward flush only, back flush only, or both) depending on the operating conditions and fouling levels. This parameter adjustment allows the system to optimize performance and protect against pressure spikes during cyclic demand variations, maintaining membrane integrity while adapting to changing usage patterns.
4Productivity
If higher pressure differential is applied to maintain filtration rate in fouled filters, then filtration productivity is maintained, but membrane stress increases leading to premature rupture
Solution Approach 1:
The system performs preliminary flushing actions before the filter becomes severely fouled and requires high pressure differentials. By periodically cleaning the membranes through forward and back flush operations, the system maintains lower operating pressure differentials that preserve membrane strength, while still achieving adequate filtration rates through the clean membrane surface area.
Solution Approach 2:
The system segments the filtration capacity across multiple filter units, allowing it to maintain filtration productivity without excessive pressure differentials. When one unit is being flushed or is temporarily offline, the other units can operate at lower pressure loads, distributing the stress and preventing premature membrane rupture while maintaining overall system filtration rate.
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 system effectively extends the life of semi-permeable hollow fiber membranes by periodically flushing out accumulated contaminants and managing pressure spikes, ensuring continuous purification and reducing the need for frequent replacements.
Implementation Method 1
a semi-permeable filter membrane which removes contaminates, such as particulates, macromolecules, or other organic materials, by a size exclusion method
Implementation Method 2
a higher pressure differential is required to filter fluid at a given rate
Implementation Method 3
repetitive ON/OFF cycling of the filter system that creates pressure spikes (e.g., water hammer effects)
Data Source
AI summary
A method for selectively cleaning a flushable filter system that includes a first filter unit and a second filter unit each of which is configured to purify unpurified liquid into purified liquid, the method comprises the steps of: operating the flushable filter system such that one of the first filter unit and the second filter unit is cleaned, while the other of the first filter unit and the second filter unit produced the purified liquid that is used to back flush the one of the first filter unit and the second filter unit that is being cleaned.