Experimental Investigation of the Anode Area in the Hybrid Water-Gas DC Arc Plasma Torch

0525277 - ÚFP 2021 CZ eng D - Thesis
Ondáč, Peter
Experimental Investigation of the Anode Area in the Hybrid Water-Gas DC Arc Plasma Torch.
Ústav fyziky plazmatu AV ČR. Defended: Univerzita Karlova, Matematicko-fyzikální fakulta. 11.05.2020. - Praha: Univerzita Karlova, Matematicko-fyzikální fakulta, 2020. 109 s.
Grant - others:GA MŠk(CZ) LM2010005
Institutional support: RVO:61389021
Keywords : DC * anode * plasma torch
OECD category: Chemical process engineering
https://dspace.cuni.cz/handle/20.500.11956/117184

This thesis focuses on an experimental study of the anode area of thehybrid water-gas DC arc plasma torch that is used in many industrial applica-tions, including plasma spraying, hydrocarbon reforming, pyrolysis, and organicwaste gasification. The effects of ambient pressure and plasma generation conditions on the torch’s plasma jet were studied, with particular focus on the torch’s anode area. Movement of the anode arc attachment is described in detail, including its speed, range of its motion on the anode surface, restrike periods, and the frequency of its many sudden decelerations and re-accelerations. It was found that the anode erosion can be compared relatively simply by quick processing of high-speed camera videos. The anode erosion was also measured directly. Many electric probe measurements were made in the anode area of this plasma torchfor the first time. By using these electric probes, shock waves, turbulent vortices,and plasma potential fluctuations were studied directly. It was found that a meanplasma electric field and a mean plasma electrical conductivity in the anode areacan be satisfactorily estimated also non-intrusively by quick processing of high-speed camera videos. Moreover, schlieren videos of the plasma jet in the anodearea were created.
Permanent Link: http://hdl.handle.net/11104/0309455