Long-service-life plasma arc torch

Golish, V. I.; Карпенко, Е. И.; Luk’yashchenko, V. G.; Мессерле, В. Е.; Устименко, А. Б.; Ushanov, V.Zh.

doi:10.1134/s0018143909040134

Cited by 17 publications

(6 citation statements)

References 3 publications

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“…The plasmatron is a low-temperature plasma generator (Figure 1) supplied with electric power [11][12][13][14]. As a result of electric charges, an arc is formed between the electrodes, cathode and anode.…”

Section: Figure 1 -Principle Scheme Of a Plasmatron And Cylindrical Direct Flow Burner Mountingmentioning

confidence: 99%

Modelling of the pulverized coal plasma preparation for combustion

Мессерле¹,

Устименко²

2021

phst

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The main goal of this research is to show the action of pulverized coal in the plasma chamber through computer simulation and numerical experiments carried out with the aid of developed well known thermodynamic, kinetic and multi dimensional computational fluid dynamics based on mathematical models. The data needed for the validation of the numerical procedure were obtained from a cylindrical direct flow burner equipped with a plasmatron (plasma generator) with 100kW of electric power and mounted on a full-scale boiler (Gusinoozersk TPP, Eastern Siberia). The experiments were carried out using 'Tugnuisk' bituminous coal. Two mathematical models were employed: the one ('1D Plasma-Coal') being one-dimensional, but with an emphasis on complex chemistry, the other (3D FAFNIR) being fully three-dimensional with emphasis on the geometry and overall combustion processes. 1D Plasma-Coal numerical experiments gave the predicted temperatures and velocities of gas and solids along the chamber length; while the concentrations of the gas components (CO, CO2, H 2 , CH 4 , C 6 H 6 , N 2 , H 2 O) were reported for the chamber exit. The degree of coal gasification showed that 54% of coal carbon was gasified within the plasma chamber. 3D numerical results for plasma jet spreading length were in good agreement with the measured data, while the temperature profiles within the plasma chamber were over predicted. The predictions of main species concentrations reveal that oxygen was completely consumed with the exit product stream consisting of combustible gases, un-burnt volatiles and char particles.

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Section: Figure 1 -Principle Scheme Of a Plasmatron And Cylindrical Direct Flow Burner Mountingmentioning

confidence: 99%

Modelling of the pulverized coal plasma preparation for combustion

Мессерле¹,

Устименко²

2021

phst

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“…Since the nature of the cathode and anode jets is the same, the working conditions of the copper cathode (2) can be similarly written for the anode: G/pd 4 10 -6 ; I < I cr = 1.6 10 6 (G/p) 1/2 (3) The difference between first inequalities in (2) and 3is caused by the fact that anode erosion depends more on arc spot velocity V d than in the case of the cathode (Fig. 6).…”

Section: Aerodynamics Of the Vortex Flow In The Electrode Chambermentioning

confidence: 99%

“…The use of cupper cylindrical elecnrodes in the arc plasmatorches proved their high reliability and prospects for the heating of oxygen-bearing media. A relatively low level of specific erosion of these elecrodes (2·10 -9 kg/C for cathodes and 2·10 -9 ÷5·10 -11 kg/C for anodes) [1,2] is provided by spreading of the heat flux from a bearing spot of the arc over a larger area because of its fast moving over the surface due to aerodynamic and electrodynamic forces, which act on a radial region of the arc. However, there are some regimes of arc combustion, when erosion of electrodes may be high and their lifetime is insignificant for practical use of the plasma device.…”

mentioning

confidence: 99%

Effect of Swirling Gas Flow in Electrode Cavity on its Erosion

Anshakov

Butakov²,

Urbakh

et al. 2017

Proceedings of the International Conference "Actual Issues of Mechanical Engineering" 2017 (AIME 2017)

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Investigation results on specific erosion of copper tubular electrodes of the arc plasmatron for air heating are presented. The decisive influence of spatial stabilization of the arc discharge and current strength on the value of specific erosion is shown. The conditions of optimal erosion of electrodes are determined depending on the flow rate of plasma-forming gas, pressure in a discharge chamber, and an electrode diameter

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“…In this paper we consider the fabrication of nano structured carbon products of hydrocarbon gas pyrol ysis in dc arc plasma torches used for plasma ignition of coal [2][3][4][5]. The lifetime of plasma torch electrodes can be extended by regeneration of the electrode material, which consists in the deposition of atoms and ions from near electrode plasma on their active surface.…”

mentioning

confidence: 99%

“…The lifetime of plasma torch electrodes can be extended by regeneration of the electrode material, which consists in the deposition of atoms and ions from near electrode plasma on their active surface. To apply the method, a technology of plasma pyrolysis of hydrocarbon gases accompanied by pre cipitation of condensed pyrolysis products on the plasma torch electrodes has been developed [2,3]. A propane-butane gas mixture is fed into the arc zone through holes in the electrodes.…”

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confidence: 99%

Nanocarbon structures formed in a universal plasma reactor

Мессерле¹,

Устименко

Ushanov³

et al. 2014

High Energy Chem

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The results of an instrumental study of a deposit formed on the electrodes of an arc plasma torch with propane-butane mixture feeding into the interelectrode gap are presented. The optical, electron, and Raman microscopy techniques have been used in the study. According to Raman spectra, the cathode deposit contains various forms of nanocarbon. It has been found that maleic anhydride is synthesized and covalently grafted to nanographite in the absence of a specialty catalyst during plasma torch operation. Having a large specific surface area, the nanocarbon itself acts as a heterogeneous catalyst in this case. It has been shown that an arc plasma torch of this design with a hydrocarbon feed gas can be considered a mini reactor for synthesis of different forms of nanocarbon, its surface modification, and alteration of physicochemical properties.

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Long-service-life plasma arc torch

Cited by 17 publications

References 3 publications

Modelling of the pulverized coal plasma preparation for combustion

Modelling of the pulverized coal plasma preparation for combustion

Effect of Swirling Gas Flow in Electrode Cavity on its Erosion

Nanocarbon structures formed in a universal plasma reactor

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