Microwave Plasma Torch Cavity for Low-Power Waste Gas Treatment
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Solution Overview
Problem
Conventional plasma torches for treating waste gas require excessive electrical power and fuel consumption, making them costly and inefficient.
Innovation Solution
The apparatus employs a microwave source, waveguide component, and a resonant cavity with a tapered chamber design, which maximizes microwave field intensity, reducing the need for excessive electrical power and eliminating the requirement for fuel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional plasma torch is used to treat waste gas, then perfluorocompounds can be decomposed effectively, but electrical power consumption and fuel consumption become excessively high
Solution Approach 1:
The resonant cavity is divided into two chambers: a first chamber (tapered space) and a second chamber (combustion chamber). This segmentation allows the microwave energy to be focused and amplified in the tapered space before entering the combustion chamber, reducing the overall power required compared to a single-chamber design.
Solution Approach 2:
The patent introduces a tapered spatial dimension in the first chamber, transitioning from a larger cross-sectional area at the inlet to a smaller area at the outlet. This dimensional change concentrates the microwave energy and enhances the electric field intensity, improving decomposition efficiency while reducing power consumption.
2Reliability
If conventional plasma torch is used to treat waste gas, then perfluorocompounds can be decomposed effectively, but fuel consumption becomes excessively high
Solution Approach 1:
The patent replaces the conventional fuel-based heating system with a microwave-based plasma system. The microwave source generates electromagnetic energy that directly excites the gas molecules to form plasma, eliminating the need for fuel combustion while maintaining effective decomposition temperatures.
Solution Approach 2:
The patent changes the energy input parameter from chemical energy (fuel) to electromagnetic energy (microwave). This parameter change fundamentally alters the energy source, eliminating fuel consumption while maintaining the high temperatures necessary for decomposing perfluorocompounds.
3Use of energy by moving object
If microwave field intensity is maximized in resonant cavity, then electrical power requirements are reduced, but chamber design complexity increases
Solution Approach 1:
The first chamber employs a tapered geometry with curved surfaces, transitioning smoothly from a larger inlet cross-section to a smaller outlet cross-section. This curved, tapered design naturally focuses the microwave energy and enhances field intensity without requiring additional complex focusing components.
Solution Approach 2:
The tapered first chamber serves multiple functions: it acts as a waveguide for microwave transmission, a focusing element to concentrate energy, and a transition piece between the waveguide component and the combustion chamber. This multi-functionality reduces the need for separate components, balancing design complexity with performance.
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 significantly reduces electrical power requirements and eliminates fuel consumption, thereby lowering costs and achieving energy savings while effectively treating gaseous pollutants.
Implementation Method 1
a microwave source generating a microwave oscillation
Implementation Method 2
the microwave oscillation interacting with an ignition gas in the second chamber to form a torch
Implementation Method 3
a waveguide component coupled to the microwave source to transmit the microwave oscillation; the microwave oscillation is substantially transmitted in the resonant cavity along a waveguide direction
Data Source
AI summary
An apparatus for treating gaseous pollutant with plasma comprises a microwave source generating a microwave oscillation; a waveguide component coupled to the microwave source; and a resonant cavity coupled to the waveguide component, the microwave oscillation is substantially propagated toward a waveguide direction, the resonant cavity comprises a first chamber and a second chamber, the waveguide direction is substantially parallel to a reference axis defined in the first chamber, the first chamber has an inner wall surrounding the reference axis, the inner wall comprises a first inner wall obliquely inclined toward the reference axis and a second inner wall substantially parallel in respect to the reference axis relatively, an area of the first inner wall is larger than that of the second inner wall so that the first chamber has a tapered space, and the microwave oscillation interacts with an ignition gas in the second chamber to generate a torch.