Coalescing Filter Element with Selective Barrier for Multi-Phase Separation
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Solution Overview
Problem
Existing technologies face challenges in efficiently separating multi-phasic fluids, particularly in removing excess free and emulsified water from diesel fuel and lubrication oil systems, which can lead to equipment damage and operational issues.
Innovation Solution
A coalescing filter element is designed with a first filter stage for coalescing the first phase, a second filter stage for further coalescing, a selectively permeable barrier to allow outflow of the second phase while inhibiting the first phase, and a drain to facilitate the outflow of the first phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single filter stage is used for coalescing, then the device complexity is reduced, but the separation efficiency is insufficient
Solution Approach 1:
The filter element is divided into a first filter stage and a second filter stage, each with different pore sizes and coalescing capabilities. The first stage handles initial coalescing of dispersed droplets, while the second stage performs further coalescing, thereby improving overall separation efficiency without requiring an overly complex single-stage design.
Solution Approach 2:
The patent introduces a gap dimension between the first and second filter stages, creating a three-dimensional flow path structure. This gap allows coalesced droplets to settle and prevents re-entrainment, adding a spatial dimension to the coalescing process that enhances separation efficiency beyond what a flat single-stage filter could achieve.
2Manufacturing precision
If the pore size of the filter is reduced to improve coalescing, then the separation efficiency is improved, but the flow rate through the filter is reduced
Solution Approach 1:
The filtering function is segmented into two stages with different pore sizes. The first filter stage has smaller pore size for effective coalescing, while the second filter stage has larger pore size that allows maintained flow rate. This segmentation enables the system to achieve both high coalescing efficiency and acceptable flow rate that would be impossible with a single uniform pore size.
Solution Approach 2:
The gap between filter stages introduces an additional flow dimension where coalesced droplets can settle under gravity before the filtered fluid proceeds to the second stage. This vertical settling dimension compensates for the flow restriction caused by the smaller pore sizes in the first stage, maintaining overall system productivity.
3Speed
If filter stages are placed close together to reduce residence time, then the processing speed is improved, but droplet coalescing is insufficient
Solution Approach 1:
The gap between filter stages creates a vertical settling dimension where gravity can act on coalesced droplets. This gravitational separation dimension allows sufficient coalescing time without requiring excessive horizontal residence time, thereby maintaining fast processing speed while achieving complete droplet coalescing.
4Manufacturing precision
If a selectively permeable barrier is added to prevent re-entrainment, then the separation efficiency is improved, but the device complexity increases
Solution Approach 1:
The gap between filter stages and the selectively permeable barrier create a vertical separation dimension that prevents re-entrainment of coalesced droplets into the continuous phase. This spatial arrangement, combined with the barrier's selective permeability, achieves high separation efficiency with a relatively simple structural addition rather than complex multi-component systems.
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 coalescing filter element achieves improved separation efficiency by effectively coalescing droplets of the first phase, reducing re-entrainment, and allowing for controlled outflow, thereby ensuring safe and reliable operation of fluid systems.
Implementation Method 1
a first filter stage for coalescing the first phase to provide an intermediate feed
Implementation Method 2
a second filter stage for coalescing the first phase from the intermediate feed
Implementation Method 3
a selectively permeable barrier which permits outflow of the second phase and inhibits outflow of the first phase
Implementation Method 4
a drain arranged between the second filter element and the selectively permeable barrier to allow outflow of the first phase
Data Source
AI summary
The present disclosure relates to the field of coalescing filter elements for separating a multi-phasic fluid. An aspect of the disclosure provides a coalescing filter element for separating a multi-phasic fluid comprising a first phase and a second phase, the filter element comprising: a first filter stage (102) for coalescing the first phase to provide an intermediate feed, a second filter stage (103) for coalescing the first phase from the intermediate feed, a selectively permeable barrier (104) which permits outflow of the second phase and inhibits outflow of the first phase, and a drain arranged between the second filter element and the selectively permeable barrier to allow outflow of the first phase.