Triangular Filter Bag Assembly for Clean-Side Contamination Control
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Solution Overview
Problem
Existing air filter systems face challenges in efficiently removing particulate matter from air streams while maintaining cleanliness of the clean air chamber during filter bag replacement and pulse cleaning, leading to potential contamination and increased energy consumption.
Innovation Solution
The use of triangular-shaped filter bags with a flange assembly and cage structure that allows for seal force transmission through the cage to maintain separation between dirty and clean air chambers, enabling easy filter bag replacement without contamination and enhancing pulse cleaning efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If filter bags are replaced through the clean air chamber, then filter bag replacement is possible, but the clean air chamber becomes contaminated with particulate matter
Solution Approach 1:
The housing is divided into separate dirty air chamber and clean air chamber sections, with filter bags accessible from the dirty air chamber side only. This segmentation allows filter bag replacement without disturbing the clean air chamber, preventing contamination while maintaining ease of operation.
Solution Approach 2:
A access port with cover is introduced as an intermediary mechanism. The cover seals the access port when closed, creating a barrier that prevents particulate matter from entering the clean air chamber during filter bag replacement operations.
2Device complexity
If conventional filter bags are used without cage support, then device complexity is reduced, but filter bags collapse under compression force during pulse cleaning
Solution Approach 1:
A flexible cage structure made of wire or rod is introduced inside the filter bag. This cage provides structural support to prevent collapse during pulse cleaning while maintaining the flexibility needed for the filter bag to expand and contract during operation. The cage is sufficiently thin-walled to allow filter media flexibility while providing necessary mechanical strength.
3Reliability
If seal force is applied directly at the flange assembly, then sealing is effective, but filter bag replacement requires disassembly of pulse collectors
Solution Approach 1:
The seal force application point is moved from the flange assembly (top dimension) to the bottom end of the filter bag (bottom dimension). This dimensional change allows the seal force to be transmitted through the entire filter bag length via the cage structure, achieving effective sealing while keeping the flange assembly and pulse collectors accessible and undisturbed during filter bag replacement.
4Quantity of substance
If filter bags are made larger to increase particulate loading capacity, then more particulate matter can be captured, but energy consumption increases
Solution Approach 1:
The filter bags are designed with an asymmetric triangular cross-section rather than conventional symmetric cylindrical or rectangular shapes. This asymmetric geometry increases the surface area for particulate capture within the same volumetric footprint, improving particulate loading capacity without proportionally increasing the air volume that must be moved and treated, thereby reducing energy consumption.
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 improves particulate loading capacity, reduces energy consumption, and minimizes noise generation by preventing contamination of the clean air chamber during filter bag replacement and enhancing pulse cleaning effectiveness.
Implementation Method 1
The cover is configured to act on the filter bag assembly to compress the seal between the flange assembly and the tubesheet when the cover is in the closed position
Implementation Method 2
a pulse generator located in the clean air chamber and configured to deliver pulses of air into the interior of the filter bag through the aperture in the tubesheet and the clean air outlet of the flange assembly
Data Source
AI summary
Air filter systems, filter bag assemblies, filter bags and corresponding methods are described herein. Air filter systems, filter bag assemblies, filter bags and corresponding methods are described herein. The filter bag assemblies include a flange assembly, a cage attached to the flange assembly, and a filter bag installed over the cage with an opening at the flange assembly. When installed in the dirty air chamber of the air filter system, a seal between the flange assembly and the tubesheet defining the dirty air chamber is provided by applying a seal force on the end of the filter bag assembly located proximate the access panel on the side of the dirty air chamber opposite the tubesheet. That seal force is transmitted to the flange assembly through the cage. The tubular filter bags may be in the form of triangular bags and/or may include bag support connectors at the closed end of the bag.