Composite Fiber Bed Mist Eliminator for Aerosol Separation
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Solution Overview
Problem
Fiber bed mist eliminators face challenges with mechanical stability and efficiency when using small diameter fibers, leading to issues like flooding, reentrainment of collected liquid, and non-uniformity in wound fiber beds, which affect separation efficiency and operational costs.
Innovation Solution
A composite fiber bed collecting media strip with an outer and inner layer of needle-punched fibers for structural integrity and an intermediate non-needle-punched layer for efficient aerosol removal, wrapped around a support structure in a spiral configuration with overlapping turns, and a drainage layer to manage liquid drainage effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If small diameter fibers are used to increase separation efficiency, then aerosol removal efficiency is improved, but mechanical stability deteriorates leading to fiber bed matting and channeling
Solution Approach 1:
The patent uses composite fiber materials combining different fiber types (e.g., glass fibers with polymeric fibers) to achieve both high separation efficiency and mechanical stability. The composite structure allows small diameter fibers for efficiency while incorporating stronger fibers for structural integrity, resolving the contradiction between efficiency and stability.
Solution Approach 2:
The patent applies different fiber properties at different locations within the fiber bed. The upstream region uses fibers optimized for capture efficiency while downstream regions use fibers optimized for drainage and structural support. This local differentiation allows small fibers to be used where needed for efficiency without compromising overall mechanical stability.
2Stability of the object's composition
If high bulk density is used to ensure mechanical stability, then fiber bed stability is improved, but flooding occurs reducing separation efficiency
Solution Approach 1:
The patent creates zones with different bulk densities within the fiber bed. The upstream region has lower density to prevent flooding and allow efficient aerosol capture, while the downstream region has higher density to provide mechanical stability and support drainage. This local differentiation resolves the contradiction between stability and efficiency.
Solution Approach 2:
The use of composite fiber materials with different density characteristics allows the fiber bed to achieve mechanical stability without requiring uniformly high bulk density throughout. The lighter fibers reduce overall density to prevent flooding while heavier fibers provide structural support where needed.
3Manufacturing precision
If thick fiber beds are used to achieve high separation efficiency, then aerosol removal is improved, but pressure drop increases raising operational costs
Solution Approach 1:
The patent optimizes fiber diameter parameters to achieve high separation efficiency with thinner beds. By using smaller fiber diameters (e.g., 0.5-5 microns) throughout the bed, the patent increases the effective surface area for capture, allowing reduced bed thickness while maintaining or improving separation efficiency, thus reducing pressure drop.
Solution Approach 2:
Composite fiber materials with optimized physical and chemical properties enable thinner fiber beds to achieve the same separation efficiency as thicker conventional beds. The enhanced capture mechanisms of composite fibers reduce the required bed thickness, thereby reducing pressure drop and operational costs.
4Area of stationary object
If wound fiber bed configuration is used to maximize surface area, then space utilization is improved, but non-uniformity develops reducing mechanical stability
Solution Approach 1:
The patent divides the fiber bed into multiple discrete layers or zones, each with uniform fiber distribution and consistent properties. This segmentation allows each layer to be independently optimized and installed, ensuring uniformity throughout the wound configuration while maintaining high surface area, thereby improving mechanical stability.
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 high separation efficiency (>99.09%) with reduced pressure drop and improved mechanical stability, allowing for thinner, more uniform fiber beds with increased surface area, reducing operational costs and facilitating easier maintenance and installation.
Implementation Method 1
an outer layer of needle punched fibers constructed to provide structural integrity to the fiber bed, and an inner layer of needle punched fibers constructed to provide structural integrity to the fiber bed
Implementation Method 2
The fibers in the fiber bed capture the aerosol in the gas by the mechanisms of impaction, interception, and Brownian diffusion
Implementation Method 3
The fibers in the fiber bed capture the aerosol in the gas by the mechanisms of impaction, interception, and Brownian diffusion
Implementation Method 4
The fibers in the fiber bed capture the aerosol in the gas by the mechanisms of impaction, interception, and Brownian diffusion
Implementation Method 5
The captured aerosol coalesces on the fibers to form droplets of liquid in the fiber bed
Implementation Method 6
the captured liquid exits the fiber bed and drains downward under the force of gravity
Data Source
AI summary
A fiber bed mist eliminator has a fiber bed which is formed of a composite fiber bed collecting media strip including a collection layer which is not subjected to needle punching. The fiber bed can be made very thin while retaining high efficiency in removing small particles of aerosol from a gas stream passing through the fiber bed. The fiber bed collecting media strip lends itself to be applied to the mist eliminator by spirally wrapping the element onto the mist eliminator. The fiber bed collecting media strip can overlap itself to seal at the locations where the fiber element overlaps itself. The fiber bed collecting media strip can be provided to the field in different formats for use in making a mist eliminator fiber bed.