DC Ionizer Air Cleaning Apparatus for Nanoparticle Removal
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Solution Overview
Problem
Current air purification methods are ineffective in removing nanoparticles smaller than 100 nanometers and lack the capacity to significantly clean large volumes of outdoor air, making them inadequate for addressing health risks in polluted areas.
Innovation Solution
A method involving DC ionization of air particles, followed by filtration using a class F9 filter, an electrically charged G1/G2/G3 filter unit, and a novel class U15 filter, which promotes agglomeration and coagulation of particles, enabling efficient removal of ultra-fine particles from both indoor and outdoor air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional filtration methods are used, then particles of 0.3 micrometers and above can be removed, but nanoparticles below 100 nanometers cannot be removed
Solution Approach 1:
The patent applies preliminary ionization action to nanoparticles before filtration. The ionizer charges the nanoparticles, making them detectable and filterable by subsequent filtration stages. This preliminary charging enables the filtration system to effectively capture particles that would otherwise pass through conventional filters.
Solution Approach 2:
The patent changes the physical parameter of particles by ionizing them, transforming neutral nanoparticles into charged particles. This parameter change (from neutral to charged state) enables the filtration system to distinguish and capture nanoparticles that are otherwise indistinguishable from clean air molecules.
2Productivity
If a large number of conventional air cleaning units are operated simultaneously to clean city air, then noticeable air quality improvement can be achieved, but the investment and operational costs become prohibitive
Solution Approach 1:
The patent uses ionization to change the electrical charge parameter of particles, enabling a single apparatus to effectively capture nanoparticles through electrostatic attraction in the filtration stage. This approach achieves high removal efficiency without requiring multiple units, thereby reducing both capital investment and operational costs while maintaining high productivity.
3Productivity
If AC ionization is used to create particle agglomeration, then some particles can be removed, but ozone formation occurs and operational costs increase
Solution Approach 1:
The patent inverts the conventional AC ionization approach by using DC ionization instead. This inversion changes the ionization mechanism from alternating current to direct current, achieving particle charging and agglomeration without the side effect of ozone formation that occurs with AC ionization. The DC approach maintains productivity while eliminating harmful byproducts.
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 approach achieves high efficiency in removing ultra-fine particles, allowing for scalable air cleaning systems capable of processing over 4.5 million cubic meters of air per hour, providing noticeable relief in smog-prone cities while preventing ozone formation and minimizing operational costs.
Implementation Method 1
means for ionizing a part, for example less than thirty percent, of the particles in the air that passes through the first air channel
Implementation Method 2
an electrically charged filter unit (9) that comprises one or more filters from the classes G1, G2 or G3
Data Source
AI summary
The present invention relates to a method and an apparatus for cleaning outside or inside air that is polluted by solid particles. The method comprises a specific sequence of measures for promoting agglomeration and/or coagulation of the particles, including ionization, followed by a series of filtrations. This lead to a surprising removal of ultra-fine particles of 1-100 μm with a great efficiency. The invention includes an apparatus for the application of the method.