Microwave Plasma Torch Null Line Discharge Tube Positioning
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Solution Overview
Problem
Conventional microwave plasma torches are limited by specific frequency constraints that restrict plasma volume and create temperature gradients, making it difficult to inject materials effectively due to pressure differences within the discharge tube.
Innovation Solution
The design involves a microwave plasma torch system with a discharge tube positioned to align with null points of the electric field distribution, increasing the waveguide width to accommodate a larger diameter discharge tube, allowing for a massive plasma volume and uniform temperature distribution, facilitating easier material injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the waveguide width is increased to accommodate a larger diameter discharge tube, then the plasma volume increases, but the waveguide dimensions become larger and more complex
Solution Approach 1:
The discharge tube is repositioned from the central region to the peripheral region of the waveguide, utilizing the lateral dimension more effectively. This dimensional reconfiguration allows the discharge tube to be positioned where the electric field null lines naturally occur, enabling larger plasma volume without proportionally increasing waveguide complexity
Solution Approach 2:
The invention exploits the non-uniform electric field distribution within the waveguide, specifically positioning the discharge tube at regions with null electric field lines (both longitudinal and transverse). This local optimization allows the discharge tube to be strategically placed where it can accommodate larger dimensions while maintaining electromagnetic field integrity
2Productivity
If the discharge tube is positioned in the central portion of the waveguide, then the plasma generation is efficient, but the temperature gradient creates pressure difference that makes material injection difficult
Solution Approach 1:
Instead of positioning the discharge tube in the conventional central position, the invention inverts this arrangement by placing the discharge tube in the peripheral region of the waveguide. This inversion reverses the temperature and pressure distribution pattern, creating a favorable gradient for material injection while maintaining plasma generation efficiency through strategic alignment with electric field null lines
Solution Approach 2:
The invention utilizes the natural null lines of the electric field distribution (both longitudinal and transverse) as guiding patterns for positioning the discharge tube. By copying this field distribution pattern into the physical positioning strategy, the system achieves optimal both plasma generation and material injection conditions
3Reliability
If a conventional waveguide with dominant mode propagation is used, then the microwave propagation is stable, but the specific frequency limits the plasma volume
Solution Approach 1:
The invention changes the geometric parameters of the waveguide system, specifically the width dimension (setting it to na where n≥2), which fundamentally alters the electromagnetic mode structure and field distribution. This parameter change enables the system to support larger plasma volumes while maintaining stable microwave propagation through the modified waveguide geometry
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 enables massive plasma treatment capabilities, improves material injection efficiency, and expands applications such as plasma gasification and waste gas purification by overcoming the limitations of conventional systems.
Implementation Method 1
a microwave generator configured to propagate a microwave to the plasma generator; wherein the microwave generator includes a waveguide configured to propagate the microwave to the plasma generator
Implementation Method 2
heat a plasma source gas using a microwave to generate a pure plasma torch
Data Source
AI summary
There is provided a microwave plasma torch system comprising: a plasma generator; a microwave generator; and at least one plasma source gas injector, wherein the microwave generator includes a waveguide, wherein the plasma generator includes a discharge tube, wherein the discharge tube passes through a waveguide in a perpendicular to the waveguide, wherein the waveguide has a width na, where n is an integer equal to or larger than 2, wherein a is defined as a width of a waveguide having a dominant mode for propagating a microwave, wherein the discharge tube is positioned relative to the waveguide such that a diameter center of the tube encounters a longitudinal null line of an electric field distribution, wherein the discharge tube is further positioned relative to the waveguide such that a diameter center of the tube encounters a transverse null line of an electric field distribution, wherein the transverse null line is perpendicular to the longitudinal null line.