Microwave Plasma Swirl Module for Uniform Feedstock Processing
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Solution Overview
Problem
Conventional microwave plasma apparatuses face challenges with plasma non-uniformity and material processing due to temperature differences between the interior and exterior of the plasma plume, leading to limitations in processing certain materials and issues with feedstock melting.
Innovation Solution
A microwave plasma apparatus with a core swirl module and a swirl module generating composite gas flows, which are combined to create a stable and uniform plasma, using swirl gas flows to protect the inner diameter of the torch from high heat and allow for efficient material processing at various angles and power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional induction plasma is used, then the outer region can reach high temperature (10,000 K), but the inside processing region temperature is low (1,000 K) leading to plasma non-uniformity
Solution Approach 1:
The patent inverts the conventional induction plasma temperature distribution by using microwave heating to heat the interior region to high temperature (10,000 K) while keeping the outer region at lower temperature (1,000 K), achieving uniform plasma throughout the processing region and enabling consistent material processing.
2Temperature
If induction plasma is used to process feedstocks at low temperatures, then material melting is avoided, but the plasma is extinguished
Solution Approach 1:
The patent applies local quality by creating distinct temperature zones within the plasma reactor: the interior processing region maintains high temperature (10,000 K) for effective material processing, while the outer region maintains low temperature (1,000 K) to prevent feedstock melting. This spatial temperature differentiation allows the plasma to remain stable and continuous while processing materials at appropriate temperatures.
3Productivity
If microwave power is increased to improve processing efficiency, then plasma uniformity is maintained, but torch lifetime is reduced due to high heat exposure
Solution Approach 1:
The patent protects the torch structure by maintaining low temperature (1,000 K) in the outer region where the torch walls are located, while concentrating high temperature (10,000 K) microwave heating in the interior processing region. This spatial separation allows high power microwave processing to proceed efficiently while the torch structure remains thermally protected, extending its operational lifetime.
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 solution achieves stable and uniform plasma generation at higher power levels, extending the lifetime of the torch and enabling efficient processing of materials by maintaining the hot zone free from deposits, allowing for precise temperature control and residence time adjustment.
Implementation Method 1
a microwave power source in communication with the composite gas flow and configured to provide microwave radiation to generate a microwave plasma upon contact with the composite gas flow
Implementation Method 2
the microwave radiation couples to the process gas to produce a plasma jet
Implementation Method 3
The plasma jet may be stabilized within the plasma chamber by contact with a swirling gas flow. Stabilizing the plasma jet prevents it from contacting the plasma chamber
Data Source
AI summary
Disclosed herein are systems, methods, and devices processing feed material utilizing an upstream swirl module and composite gas flows. Some embodiments are directed to a microwave plasma apparatus for processing a material, comprising: a first flow module, a second flow module, and a liner.