Atmospheric Plasma Jet Preheating for Low-Temperature Activation
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Solution Overview
Problem
Existing methods for generating plasma jets under atmospheric pressure face limitations, particularly in achieving high activation at low temperatures, making them unsuitable for sensitive workpieces or biological applications, and are hindered by high investment costs and inefficiencies in processing larger components.
Innovation Solution
Preheating the plasma-capable medium before electrical excitation allows for independent adjustment of plasma power and temperature, enabling high activation at low temperatures through thermal energy supplementation, reducing electrical energy requirements and optimizing surface treatment processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If atmospheric-pressure plasma is generated using conventional electrical excitation by electric arc, then plasma activation is achieved, but plasma temperature becomes too high for sensitive workpieces
Solution Approach 1:
The plasma-capable medium is preheated to a defined temperature before electrical excitation occurs. This preliminary thermal preparation reduces the electrical energy required during arc discharge, enabling plasma activation at lower overall temperatures that are compatible with sensitive workpieces and biological tissues
Solution Approach 2:
The invention changes the physical state and temperature parameters of the plasma-capable medium before excitation. By controlling the preheating temperature and composition of the medium, the plasma can be activated with reduced temperature rise, achieving the desired activation effect without excessive heat that would damage sensitive materials
2Reliability
If electrical energy is used to generate atmospheric-pressure plasma, then plasma activation is achieved, but electrical energy consumption is high
Solution Approach 1:
By preheating the plasma-capable medium before electrical excitation, a portion of the total energy requirement is met through thermal energy input. This preliminary action reduces the electrical energy burden during the actual plasma generation phase, improving overall energy efficiency
Solution Approach 2:
The invention combines thermal energy input (through preheating) with electrical energy input (through arc discharge) to achieve plasma activation. This energy merging approach allows the system to leverage both thermal and electrical energy sources, reducing reliance on high electrical energy consumption alone
3Reliability
If low-pressure plasma treatment is used, then good gap-penetration and high effectiveness are achieved, but investment costs and process time increase
Solution Approach 1:
The invention changes the pressure parameter from low-pressure to atmospheric-pressure operation. By generating atmospheric-pressure plasma with preheated medium and controlled electrical excitation, the system achieves effective surface treatment without requiring complex vacuum chambers, thereby reducing device complexity and investment costs while maintaining treatment effectiveness
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 enables effective surface treatment of sensitive materials and biological tissues by maintaining low plasma temperatures, enhancing activation and cleaning effects, increasing process speed, and reducing sensitivity to sample spacing, while allowing for optimal temperature control and new plasma chemistry applications.
Implementation Method 1
Preheating the plasma-capable medium before electrical excitation allows for independent adjustment of plasma power and temperature, enabling high activation at low temperatures through thermal energy supplementation
Implementation Method 2
the plasma jet being generated by electrically exciting a plasma-capable medium by means of an electric arc periodically ignited between a cathode and an anode constructed as a nozzle
Data Source
AI summary
A method and a device for generating a plasma jet under atmospheric pressure for the surface treatment of workpieces has a supply line for the plasma-capable medium, and an apparatus for electrically exciting the plasma-capable medium by an electric arc periodically ignited between a cathode and an anode constructed as a nozzle. To achieve a highly effective plasma jet even at relatively low temperatures of the plasma jet, a heating apparatus for preheating the plasma-capable medium is arranged upstream of the apparatus for electrically exciting the plasma-capable medium.