Cyclonic Air Filtration Bank With Asymmetric Diffusers
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Solution Overview
Problem
Existing air cyclones in ventilation systems suffer from poor energy efficiency and inadequate particle separation across a range of particle sizes, often resulting in high pressure drops and inefficient filtration.
Innovation Solution
The air filtration system incorporates a bank of cyclonic air classifiers with specifically configured vortex-inducing inlet ducts and conical diffusers of varying lengths, mounted on a frame to minimize waste outlet flow interference, along with a grit collection chute, to enhance particle removal efficiency and reduce pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If existing air cyclones are used in ventilation systems, then particle removal is achieved, but energy efficiency is poor and pressure drop is high
Solution Approach 1:
The patent applies local quality by varying the diffuser length in different cyclone units within the bank. Specifically, alternate cyclone units have different diffuser lengths (first diffuser length vs. second diffuser length), creating local variations in flow characteristics that reduce interference between adjacent cyclones and improve overall energy efficiency while maintaining particle removal effectiveness
Solution Approach 2:
The patent employs asymmetry by configuring adjacent cyclonic air classifiers with different diffuser lengths and oppositely orientated vortices. This asymmetric arrangement breaks the symmetry of flow patterns between adjacent units, reducing waste outlet flow interference and lowering pressure drop across the filtration bank, thereby improving energy efficiency without compromising particle separation
2Productivity
If existing air cyclones are used, then filtration is performed, but particle separation is inadequate across a range of particle sizes
Solution Approach 1:
The patent segments the particle separation task across multiple cyclone units with different configurations. By having alternate units with different diffuser lengths, the system creates a distribution of separation characteristics that collectively handle a broader range of particle sizes more effectively than uniform cyclones, improving adaptability across the particle size spectrum
Solution Approach 2:
The patent changes the diffuser length parameter between alternate cyclone units to optimize performance across different particle sizes. This parameter variation allows each unit to be tuned for different separation characteristics, enabling the bank as a whole to effectively separate particles across a wider size range including fine particles from 10 microns upward
3Area of stationary object
If adjacent cyclonic air classifiers are mounted closely, then space is saved, but waste outlet flow interference increases and pressure drop rises
Solution Approach 1:
The patent uses local quality variations in diffuser length to mitigate flow interference effects in closely spaced cyclones. The alternating diffuser lengths create local flow pattern differences that reduce constructive interference between adjacent units, allowing compact arrangement while maintaining acceptable pressure drop levels
Solution Approach 2:
By introducing asymmetry through different diffuser lengths in adjacent units, the patent reduces the symmetry of flow interference patterns. This asymmetric configuration prevents coherent flow interference that would otherwise occur in uniformly spaced cyclones, enabling closer spacing without excessive pressure drop increases
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 configuration leads to improved particle separation and filtration efficiency, reduced pressure drop, and effective collection of particles of different sizes, while allowing for modular design and easy maintenance, with the system capable of filtering out particles from 10 microns upward.
Implementation Method 1
cyclonic air classifiers for separating large or heavy particles, such as dust particles or other impurities, from an airstream by centrifugal action of the classifier
Implementation Method 2
vortex-inducing inlet ducts...configured to induce oppositely orientated vortices in the respective hollow classifier bodies
Implementation Method 3
at least partially conical diffuser which extends from the inlet duct toward the extraction pipe...results in less pressure drop across the air filtration bank
Data Source
AI summary
The invention relates to an air filtration bank (100) and an air filtration system (50) for removing grit or impurities from an airstream using a plurality of cyclonic air classifiers (10) arranged in 2×2 arrays in each air filtration bank (100). The system (50) comprises a plurality of interconnected, modular air filtration banks (100) arranged side-by-side and a grit collecting chute (5). In order to improve airflow efficiency and particle separation, each cyclonic air classifier (10) includes a vortex-inducing inlet duct (13), an extraction pipe (16) and a conical diffuser (15). The conical diffusers (15) of upper and lower cyclonic air classifiers are of different lengths such that their respective waste outlets are not coplanar which serves to limit waste outlet flow interference and results in less pressure drop across the air filtration bank, which in turn leads to more efficient particle removal.