Electro-blown Nanofiber Filter Media for Gas Turbine Dust Filtration
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Solution Overview
Problem
Existing composite nonwoven filter media with nanofiber layers are vulnerable to mechanical stress, leading to shedding and reduced filtration efficiency, allowing dust to penetrate and causing pressure drop and turbine blade fouling in gas turbines, necessitating frequent maintenance and downtime.
Innovation Solution
A composite filter media with a spunbond nonwoven fabric substrate and a nanofiber layer formed using an electro-blown spinning process, providing a durable three-dimensional filtration layer with increased basis weight and improved bonding between fibers, enhancing filtration efficiency and resistance to mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lightweight nanofiber layer is deposited on the base substrate, then filtration efficiency is improved, but mechanical strength and resistance to shedding deteriorate
Solution Approach 1:
The patent applies composite materials by combining a spunbond nonwoven fabric substrate with an electrospun nanofiber layer. The spunbond substrate provides mechanical strength while the nanofiber layer provides filtration efficiency, creating a composite structure where each component compensates for the other's weaknesses.
Solution Approach 2:
The patent changes the parameter of fiber diameter by using nanoscale fibers (typically 100 nm) in the electrospun layer to achieve high filtration efficiency, while maintaining the macro-scale spunbond substrate to provide mechanical strength. This multi-scale composite approach resolves the contradiction between fine fiber performance and mechanical durability.
2Reliability
If the nanofiber layer is formed with smaller fiber diameters, then filtration efficiency is improved, but bonding strength to base media deteriorates
Solution Approach 1:
The patent uses electrospinning to create nanofibers with diameters typically around 100 nm, which provides high filtration efficiency. The electrospinning process also creates a porous, three-dimensional structure that increases surface area for bonding to the base media, compensating for the weak attraction bonds inherent in fine fibers.
Solution Approach 2:
The electrospun nanofiber layer forms a porous, three-dimensional structure that increases the surface area available for bonding to the spunbond substrate. This porous architecture allows for better mechanical interlocking and increased bonding strength despite the small fiber diameters.
3Ease of manufacture
If the nanofiber layer is made two-dimensional or single-layer, then manufacturing is simplified, but durability under mechanical stress deteriorates
Solution Approach 1:
The patent transitions from a two-dimensional or single-layer nanofiber structure to a three-dimensional nanofiber layer. This three-dimensional architecture provides better mechanical durability and resistance to cracking while still being manufacturable through electrospinning processes.
4Productivity
If the filter media operates for extended periods, then productivity is maintained, but dust penetration increases due to low initial efficiency
Solution Approach 1:
The composite structure of spunbond substrate plus electrospun nanofiber layer achieves high initial filtration efficiency (70% or greater for 0.4 μm particles), which maintains reliable performance over extended operation periods. The spunbond substrate provides structural integrity while the nanofiber layer provides high efficiency filtration, allowing continuous operation without frequent blade cleaning.
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 solution achieves a 15% increase in filtration efficiency for 0.4 µm particles and a 30% lower pressure drop, with a higher quality factor and reduced deflection, allowing for effective reverse pulse cleaning and extended filter life without significant airflow restriction.
Implementation Method 1
a nanofiber layer formed from a polymer material using an electro-blown spinning process
Data Source
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AI summary
A composite filter media structure includes, in an exemplary embodiment, a base substrate that includes a nonwoven synthetic fabric formed from a plurality of fibers with a spunbond process. The base substrate has a filtration efficiency of about 35% to less than 50%, measured in accordance with EN 1822 (1998) test procedure A nanofiber layer is deposited on one side of the base substrate. The composite filter media structure has a minimum filtration efficiency of about 70%, measured in accordance with EN 1822 (1998) test procedure.