Plate-like Aerosol Distributor for Compact Filter Testing
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Solution Overview
Problem
Existing aerosol distributors for filter leakage detection in gas filtration systems often require significant space and increased airflow resistance due to the need for aerosol particles to be evenly distributed across the filter area, leading to higher costs and energy consumption, and do not provide satisfactory particle distribution when placed close to the filter surface.
Innovation Solution
An aerosol distributor with a hollow, plate-like housing having aerosol inlet channels and outlet holes, configured to inject aerosol in a countercurrent manner, allowing for efficient distribution and placement close to the filter surface, reducing particle distribution deviation and airflow resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If aerosol is introduced through a single injection point far upstream of the filter, then complete dispersion and even distribution of aerosol particles is achieved, but the space requirements and length of the test section are significantly increased
Solution Approach 1:
The single aerosol injection point is segmented into multiple injection points distributed across the test section. This allows aerosol to be introduced at multiple locations simultaneously, achieving even distribution across the filter surface without requiring a long test section for natural dispersion. The segmentation transforms a spatial distribution problem into a multi-point injection problem that solves both uniformity and compactness requirements.
Solution Approach 2:
A countercurrent gas stream is introduced as an intermediary medium to enhance aerosol mixing and distribution. The gas stream flows opposite to the main airflow, creating turbulence and promoting rapid dispersion of aerosol particles throughout the test section. This intermediary gas flow acts as a mixing mechanism that achieves uniform distribution without requiring long diffusion distances.
2Manufacturing precision
If baffles or mixing elements are disposed between the aerosol injection point and the filter, then adequate mixing is achieved over a shorter length, but the airflow resistance is significantly restricted
Solution Approach 1:
Instead of using solid baffles that restrict flow, the invention uses a pneumatic approach by introducing a countercurrent gas stream. This gas flow creates turbulence and mixing through fluid dynamics rather than physical obstruction. The pneumatic mixing mechanism achieves adequate aerosol distribution without significantly restricting the main airflow, thereby avoiding the energy loss associated with baffle-based mixing elements.
3Productivity
If multiple filters are employed in series, then filtration capacity is increased, but the space requirements and material costs are multiplied due to increased separation distances
Solution Approach 1:
The aerosol injection system is segmented into multiple injection points that can serve multiple filters in series. By distributing injection points strategically, the system achieves adequate aerosol distribution for each filter without requiring excessive separation distances. This segmentation allows compact arrangement of multiple filters while maintaining testing effectiveness.
Solution Approach 2:
The invention transitions from a single-dimension (long axial distance) mixing approach to a multi-dimensional approach by distributing injection points across the cross-section and introducing countercurrent flow. This dimensional change allows adequate mixing to occur in a compact volume, enabling multiple filters to be arranged in series with reduced spacing between them.
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 aerosol distributor achieves uniform aerosol distribution across the filter area with reduced pressure drop, enabling a more compact filter testing system design while maintaining accurate leak detection, with particle distribution deviation reduced to less than 15% and pressure drop minimized.
Implementation Method 1
configured to inject aerosol in a countercurrent manner, allowing for efficient distribution
Implementation Method 2
efficient distribution and placement close to the filter surface, reducing particle distribution deviation
Data Source
AI summary
An aerosol distributor and an arrangement for filter leakage detection in a gas filtration system comprising such aerosol distributor, the aerosol distributor being configured to be positioned in a gas stream upstream of a filter, said aerosol distributor comprising: a hollow housing having at least one aerosol inlet for admitting an aerosol from an aerosol source into a chamber inside said housing, and a plurality of aerosol outlet holes for releasing the aerosol from the chamber into a gas stream surrounding the housing, wherein said housing has a plate like shape having an upstream surface configured to face an incoming gas stream and a downstream surface configured to face a filter, wherein said housing comprises a plurality of channels extending between channel inlets at the upstream surface and channel outlets at the downstream surface of the housing, such that gas from the gas stream can pass through the housing.