Investigation of Electrode Phenomena in an Innovative Thermal Plasma Process for Glass Melting

Watanabe, Takayuki; Liu, Yaping; Tanaka, Manabu

doi:10.1007/s11090-014-9530-8

Cited by 14 publications

(14 citation statements)

References 10 publications

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“…To further study characteristics of arc uctuation, the arc area existence probability was also measured spatially at different mist feeding rates (Watanabe et al, 2014). e results showed that, at the same time as when the mist feeding rate increased, the existence probability in both axial and radial directions was evidently increased and as well as arc length.…”

Section: Arc Behavior and Temperature Distributionmentioning

confidence: 99%

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Arc Behavior and Temperature Distribution in Water Thermal Plasma with Mist Generation

Kim

Tanaka

Watanabe

et al. 2021

J. Chem. Eng. Japan

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The present study investigates the arc behavior and temperature distribution in a water plasma with mist generation under di erent mist feeding rates. The arc uctuation was observed using a high-speed camera with arc voltage measurement. Further, the arc temperature was visualized by a high-speed video camera and band-pass lters based on the Boltzmann plot method. The experimental results showed that the arc uctuation was in the restrike mode, and the frequency as well as the arc length apparently increased with an increase of mist feeding rate due to stronger drag force. Higher arc existence probability was also observed. At the same time, the mist feeding rate played an important role in controlling the arc area with high temperature. This study will open up new opportunities for waste treatment by understanding the fundamental arc characteristics in a water plasma system.

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Section: Arc Behavior and Temperature Distributionmentioning

confidence: 99%

“…Recent studies have revealed the arc behavior using a high-speed camera. For example, arc behavior (Tanaka et al, 2011) and electrode phenomena (Tanaka et al, 2013;Watanabe et al, 2014) of multiphase AC by means of a highspeed camera have been successfully investigated.…”

Section: Introductionmentioning

confidence: 99%

Arc Behavior and Temperature Distribution in Water Thermal Plasma with Mist Generation

Kim

Tanaka

Watanabe

et al. 2021

J. Chem. Eng. Japan

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“…Multiple arc plasma generators offer an alternative to generation of large volume arc plasma, to meet the requirement of application in a complex industry environment. Watanabe et al developed a lab‐scale 12‐phase alternating current (AC) arc reactor to obtain large volume arc plasma by multi‐electrodes powered by transformers converting the 3‐phase AC to the 12‐phase AC. The 12‐phase AC power supply can effectively reduce the phase transition time from one electrode to adjacent electrode compared with a three‐phase power supply.…”

Section: Introductionmentioning

confidence: 99%

Dynamic behaviour of alternating current arc discharge in a multi‐arc generator at atmospheric pressure

Lin

Zhao

et al. 2019

Contributions to Plasma Physics

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In this letter, a multi‐arc generator with three high‐voltage electrodes and a common grounded one was developed for the purpose of obtaining large area and steady arc plasma at atmospheric pressure. Three typical discharge states were found in the multi‐arc generator: independent movement of three arc columns, confluence of two arc columns, and confluence of three arc columns. The three discharge states cyclically occur on the evolution of the arc discharge and their duration is influenced by the power dissipation and plasma working gas flow rate. With an increase of discharge power and a decrease of the gas flow rate, the duration of multiple arc confluence increases, which contributes to the suppression of the fluctuation amplitude of each arc. Frequency domain analysis of the arc voltage envelope shows that the frequency of arc fluctuation increases in the multi‐arc mode in the multi‐arc generator compared to that in the single arc mode.

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“…Fundamental phenomena in the multiphase AC arc such as electrode erosion, arc behavior, and temperature fluctuation must be investigated to realize this method as industrial technology. Recent studies using a highspeed video camera revealed the arc behavior (Tanaka et al, 2011b) and the electrode phenomena (Tanaka et al, 2013a;Tanaka et al, 2013b;Watanabe et al, 2014) of the multiphase AC arc have been revealed. Two-dimensional temperature measurement method using a high-speed video camera and band-pass filters has been developed (Tanaka et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Effects of working pressure on temperature characteristics in multiphase AC arc

Okuma

Imatsuji

Hashizume

et al. 2018

JFST

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Temperature characteristics of a multiphase AC arc in various working pressures were investigated by an innovative observation system consisting of a high-speed video camera and band-pass filters. Thermal plasmas have been widely applied to many industrial fields because of their unique advantages such as high temperature, high enthalpy, and rapid quenching capability. In particular, the multiphase AC arc is advantageous in terms of large plasma volume and high energy efficiency. Therefore, this heat source has been applied to innovative material processing such as in-flight glass melting, and functional nanoparticles fabrication. However, the temperature field and its fluctuation characteristics in the multiphase AC arc have not been understood because of the difficulties of temperature measurement due to their rapid fluctuation in millisecond timescale as well as the axisymmetric spatial characteristics. To understand and control the fluctuation phenomena is important to realize this method as industrial technology. Temperature measurement system using a high-speed camera was constructed to visualize the temperature fields of the multiphase AC arc. The fluctuations in the two-dimensional intensity distributions of particular line emissions from atomic argon were successfully observed. By analyzing these images using the Boltzmann plot method, the temperature distribution was estimated. The experimental results indicated that the arc temperature fluctuated in the range from 6,000 to 12,000 K. Higher temperature, smaller arc existence area, and decrease in the diameter of the arc were observed with an increase of working pressure. The arc temperature in the multiphase AC arc is sufficiently high to treat the refractory metals and ceramics powders at high processing rate.

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Investigation of Electrode Phenomena in an Innovative Thermal Plasma Process for Glass Melting

Cited by 14 publications

References 10 publications

Arc Behavior and Temperature Distribution in Water Thermal Plasma with Mist Generation

Arc Behavior and Temperature Distribution in Water Thermal Plasma with Mist Generation

Dynamic behaviour of alternating current arc discharge in a multi‐arc generator at atmospheric pressure

Effects of working pressure on temperature characteristics in multiphase AC arc

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