Abstract
Plasma torch is device that efficiently converts electrical energy in to thermal energy for various high temperature applications. The conventional plasma torch comprises of consumable electrodes namely anode and cathode electrodes. The replacement of these electrodes is a complex process owing to its cooling and process shut down requirements. However, microwave plasma arc is electrode-less plasma arc system that is an alternative method to conventional arc technology for generating plasma arc. In this technique, microwave power is efficiently coupled to generate plasma arc by using the property of polar molecule to absorb microwave power. The absorption of microwave power is in form of losses due to intermolecular friction and high collisions between the molecules. This is an efficient method because all microwave power can be absorbed by plasma arc. The main feature of microwave plasma arc is its large uniform high temperature column which is not possible with conventional arc discharge methods. Such type of plasma discharge is very useful in applications where sufficient residence time for treat materials is required. Microwave arc does not require any consumable electrodes and hence, it can be operated continuously that makes it very useful for hazardous effluent treatment applications. Further, microwave cannot ionize neutral particles at atmospheric pressure and hence, a gliding arc is initiated between two thin electrodes in the cavity by applying very low power high voltage (3kV) AC source. In this report, the method for generating microwave arc of 1kW power using commercial microwave oven is elaborated.
Highlights
IntroductionPlasma torch is efficient device for converting electrical energy to thermal energy for many thermal plasma applications[1]
Plasma torch is efficient device for converting electrical energy to thermal energy for many thermal plasma applications[1]. These plasma torches generate plasma arc between electrodes that are consumable materials. Replacement of these consumable electrodes is a complex process as it is susceptible to water leaking in case of metallic electrodes
In place of gliding arc, external fuel in few SCCM is fed in the discharge tube cavity for creating the initial arc which absorbs the microwave power to convert it into plasma arc
Summary
Plasma torch is efficient device for converting electrical energy to thermal energy for many thermal plasma applications[1] These plasma torches generate plasma arc between electrodes that are consumable materials. RF Plasma torch or Microwave plasma torch are This is an Open Access article published by World Scientific Publishing Company. Atmospheric pressure microwave plasma jet has shown great potential because of its efficiency and electrode-less operation. It is very useful for applications like material treatment and processing, space applications etc.[3, 4] Microwave plasma torch has been applied for diamond synthesis[5, 6]. The details of the set up are mentioned in experimental set up that is followed by results and discussions and conclusions
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