Gas Turbine Filter Cassette Mounting Face Position
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Solution Overview
Problem
Existing filter cassettes face challenges in achieving high filtration efficiency, extended lifetime, and reduced pressure drop due to torque-induced improper sealing and structural integrity issues, as well as increased air flow resistance.
Innovation Solution
The filter cassette design positions the mounting frame's mounting face between the upstream and downstream ends, reducing torque and increasing the effective filter surface area by extending into the dirty air section, while minimizing side walls to reduce weight and air flow resistance, allowing air to pass through the filter media at a lower velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the mounting face is positioned at the upstream end of the filter cassette, then the sealing is simplified, but torque is induced into the partition causing improper sealing pressure and air bypass
Solution Approach 1:
The mounting face is inverted from the conventional position at the upstream end to a central position between upstream and downstream ends. This inversion eliminates the torque-induced sealing problems by redistributing the mounting forces away from the partition, preventing air bypass while maintaining sealing effectiveness.
Solution Approach 2:
The mounting face position is changed from a one-dimensional endpoint location to a two-dimensional central location within the filter cassette structure. This dimensional repositioning allows the mounting face to be surrounded by filter media on all sides, creating a more balanced force distribution that eliminates torque on the partition.
2Ease of operation
If the filter cassette extends further into the clean air section, then the mounting is simplified, but the effective filter surface area is reduced
Solution Approach 1:
Instead of extending the filter cassette fully into the clean air section as in conventional designs, the mounting face is inverted to a central position. This allows the filter media to extend equally into both dirty and clean air sections, maximizing the effective filtration surface area while maintaining operational accessibility.
Solution Approach 2:
The position parameter of the mounting face is changed from endpoint to central location, which fundamentally alters the geometry of filter media extension. This parameter change increases the effective filter surface area by allowing pleats to extend into the dirty air section while maintaining proper mounting and sealing.
3Strength
If side walls are extended to cover the entire filter cassette, then the structural integrity is improved, but the weight increases and air flow resistance increases
Solution Approach 1:
The side walls are segmented rather than continuous, being provided only between adjacent filter panels instead of covering the entire filter cassette perimeter. This segmentation reduces the weight and air flow resistance of the side walls while maintaining sufficient structural integrity to support the filter panels and maintain the V-pocket configuration.
Solution Approach 2:
Excessive side wall material is extracted from the design by limiting side walls to only where structurally necessary between filter panels. This removal of unnecessary material reduces both weight and air flow resistance while preserving the essential structural function of supporting the filter media.
4Reliability
If the filter media is positioned to maximize surface area, then the filtration efficiency is improved, but the pressure drop increases due to higher air flow velocity
Solution Approach 1:
The filter media configuration utilizes three-dimensional space more effectively by extending into both dirty and clean air sections with the mounting face in the center. This dimensional arrangement increases the effective surface area for filtration while allowing air to pass through at lower velocities, reducing pressure drop.
Solution Approach 2:
The geometric parameters of the filter media arrangement are changed by repositioning the mounting face centrally, which alters the flow path and velocity distribution. This parameter change allows the same or greater filtration surface area to be achieved with lower air flow velocities, thereby reducing pressure drop and energy loss.
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
This design enhances filtration efficiency, extends the filter's lifetime, and significantly reduces pressure drop, improving the performance of gas turbines and other applications by maintaining airtight sealing and minimizing structural stress.
Implementation Method 1
a filter cassette for removal of particles from an air stream... a filter media (4) which extends from the upstream end (14) into the dirty air section... air to be filtered passes through the pleats
Data Source
AI summary
A filter cassette for removing particles from an air stream is provided, The filter cassette has an upstream end, a downstream end, and includes a mounting frame to which a filter media is fitted. The filter has a mounting face positioned between the filter cassette's upstream and downstream ends at a first distance (Dup) from the upstream end and a second distance (Ddown) from the downstream end. The first and second distances each amount to more than 10% of an overall length of the filter cassette. The mounting face may be positioned centrally between the upstream and downstream ends, approximately in a barycenter line of the filter cassette. The filter cassette thus extends to both sides of the partition opening. Filter surface area is increased and torque induced by the filter cassette into the partition is reduced.