Fluidized granular absorbent bed filter
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Solution Overview
Problem
Conventional filters for removing airborne molecular contaminants in clean room environments face inefficiencies due to adhesive interference and non-uniform airflow distribution, which reduces the effectiveness of granular filter media in adsorbing contaminants.
Innovation Solution
The development of filter products with multiple cells containing granular filter media that can become fluidized by an upward flow of fluid, creating a circulating fluidized bed (CFB) configuration, allowing for improved exposure and contact between fluid and filter media, eliminating the need for inert materials and adhesives, and enabling uniform airflow and increased filter capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is used to hold granular filter media in place, then the filter structure is maintained, but the adhesive covers surfaces of adsorbent particles and reduces filtering efficiency
Solution Approach 1:
The invention extracts and removes the adhesive component from the filter construction. By eliminating the adhesive layer, the filter media particles are held in place through the mechanical structure of the pleated filter elements themselves, preventing adhesive from covering adsorbent particle surfaces and maintaining filtering efficiency.
Solution Approach 2:
The invention applies different structural qualities to different parts of the filter. The pleated filter elements provide structural support where needed, while the granular filter media particles remain exposed and accessible for adsorption where required. This localized structural approach eliminates the need for universal adhesive application.
2Ease of manufacture
If pleated filter construction is used to hold granular filter media, then the filter can be manufactured and handled easily, but airflow distribution becomes non-uniform with reduced airflow at folds
Solution Approach 1:
The invention segments the filter construction into distinct pleated elements that create channels for uniform airflow. The pleated structure is designed to divide the airflow into multiple uniform paths, ensuring consistent distribution across all granular filter media particles while maintaining ease of manufacture through standard pleating techniques.
3Device complexity
If granular filter media is held in a static state, then the filter structure is simple, but the residence time of fluid and contact between fluid and particles is reduced
Solution Approach 1:
The invention introduces dynamic movement of granular filter media particles within the pleated filter elements. The particles are free to move and reposition themselves in response to airflow patterns, creating a more dynamic interaction between fluid and particles that increases residence time and contact efficiency without significantly complicating the overall filter structure.
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 the residence time of fluid within the filter, ensures uniform fluid-to-particle contact, and increases filter capacity, leading to improved contaminant removal efficiency and reduced bypass, while allowing for easy replacement and handling similar to conventional filter assemblies.
Implementation Method 1
each cell containing granular filter media contained in the cell such that the granular filter media can become fluidized by flow of gaseous fluid through the cell in an upward direction
Implementation Method 2
The adsorbent particles are held within an air-permeable structure of the filter, in a relatively static state in the filter. Contaminant-containing air is passed through the filter to allow the air to flow around and past the available surfaces of the adsorbent particles. Passing the airborne molecular contaminant-containing air through the filter allows the airborne contaminants in the air to contact a surface of the statically-held adsorbent particles, to then become adsorbed onto a surface of a particle.
Data Source
AI summary
Described are filter products and methods of using filter products, wherein the filter products include multiple cells, each cell containing an individual circulating fluidized beds during use.