A thermal non-transfer arc V-type torch plasma

Walt, I.J. van der; Havenga, J.L.; Nel, J.T.

doi:10.1109/plasma.2008.4590902

Cited by 2 publications

(4 citation statements)

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“…Different from the structure of the traditional linear arc plasma torch, the V‐type plasma torch is composed of a pair of electrodes, which can generate cathode and anode arc columns with nearly equal sizes. [ 12 ] The two arc columns converge inside the arc chamber, leading to the formation of a large‐scale arc plasma jet and increasing the high‐temperature area. This type of torch has the comparative advantages of low gas flowrate and high gas enthalpy.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the characteristics of V‐type arc plasma torch with four electrodes

Zhang

Wang

Zhu

et al. 2023

Contributions to Plasma Physics

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The arc plasma is widely used in various fields due to its excellent advantages, such as elevated temperature, high enthalpy, and increased energy density. Under this direction, a four‐electrode V‐shaped arc plasma torch was developed to increase both the arc power and plasma volume. The arc dynamic characteristics, the volt‐ampere characteristics, and the thermal efficiency of the arc plasma torch were systematically studied. From the acquired results, a large‐scale, and low‐frequency re‐strike process between the arc channels was demonstrated. Compared with the common twin‐electrode structure, the stability of the four‐electrode structure during the discharging process was improved, exhibiting a wider frequency distribution of the re‐strike events. The electrode layout may also affect the dynamic evolution process of the arc. However, from a statistical point of view, no significant differences in electrical characteristics were recorded. The four‐electrode V‐shaped arc plasma torch presented a typical descending volt‐ampere characteristic, and the re‐strike frequency increased with an increase in the current. A high thermal efficiency (above 83%) was obtained in the range of arc current of 80–200 A. At a current value of 200 A, the jet enthalpy and the average gas temperature can reach 17.41 MJ/kg and 6590 K, and the corresponding jet length was close to 80 cm because of both the high thermal efficiency and enthalpy. The stable discharge process, high thermal efficiency, high jet enthalpy value, and large volume rendered the proposed four‐electrode V‐shaped arc plasma torch to be suitable for various applications including nanomaterial preparation, metal powder spheroidization, etc.

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Section: Introductionmentioning

confidence: 99%

Experimental study on the characteristics of V‐type arc plasma torch with four electrodes

Zhang

Wang

Zhu

et al. 2023

Contributions to Plasma Physics

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“…There are several ways to enlarge an arc plasma volume to meet its applications in various fields, [15][16][17][18][19][20][21][22][23][24][25][26][27] including coal pyrolysis, [17,18] preparation of glass, [19][20][21] thermal spray [22,23] and spheroidization of alumina powder. [24,25] Unlike conventional linear plasma torches, a V-type plasma torch can pro-duce two separate arc columns, cathode arc column (CAC) and anode arc column (AAC).…”

Section: Introductionmentioning

confidence: 99%

“…[24,25] Unlike conventional linear plasma torches, a V-type plasma torch can pro-duce two separate arc columns, cathode arc column (CAC) and anode arc column (AAC). [17,18] A large area of high temperature is formed at the junction of CAC and AAC, and therefore the acetylene yield has been improved when the coal powder was injected into this thermal plasma reactor. [17,18] The use of multi-phase AC arc torch can also achieve the purpose of expanding the high-temperature region of arc plasma.…”

Section: Introductionmentioning

confidence: 99%

“…[17,18] A large area of high temperature is formed at the junction of CAC and AAC, and therefore the acetylene yield has been improved when the coal powder was injected into this thermal plasma reactor. [17,18] The use of multi-phase AC arc torch can also achieve the purpose of expanding the high-temperature region of arc plasma. [19][20][21]26,27] The initial multi-phase AC arc torch was powered by a 3-phase power supply.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of DC arcs in a multi-arc generator and their application in the spheroidization of SiO₂ *

et al. 2020

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We investigate characteristics of multi-arc torches with three pairs of electrodes (three cathodes and three anodes) and their performance on the spheroidization of SiO2 powder. The effect of electrode arrangement, including adjacent pattern (AD pattern, adjacent electrodes powered by one power supply) and opposite pattern (OP pattern, opposite electrodes powered by one power supply), on the dynamics of arc plasma is investigated based on synchronous acquisition of electrical and optical signals. The results show that both the voltage and spatial distribution of each arc of multiple arcs are more stable compared with those of a single arc. The fluctuation of an arc in multiple arcs mainly comes from the small-scale arc-to-arc restrikes among multiple arcs. Moreover, these arc-to-arc restrikes occur more frequently among multiple arc columns in OP pattern than in AD pattern. Moreover, the high-temperature area of the central region of arc chamber in OP pattern is larger than that in AP pattern. For the spheroidization of SiO2 in this multi-arc generator, the spheronization degrees of plasma treated silica in OP pattern are at least 20% higher than those in AD pattern.

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A thermal non-transfer arc V-type torch plasma

Cited by 2 publications

References 1 publication

Experimental study on the characteristics of V‐type arc plasma torch with four electrodes

Experimental study on the characteristics of V‐type arc plasma torch with four electrodes

Characteristics of DC arcs in a multi-arc generator and their application in the spheroidization of SiO₂ *

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A thermal non-transfer arc V-type torch plasma

Cited by 2 publications

References 1 publication

Experimental study on the characteristics of V‐type arc plasma torch with four electrodes

Experimental study on the characteristics of V‐type arc plasma torch with four electrodes

Characteristics of DC arcs in a multi-arc generator and their application in the spheroidization of SiO2 *

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Characteristics of DC arcs in a multi-arc generator and their application in the spheroidization of SiO₂ *