Investigation on in-flight melting behavior of granulated alkali-free glass raw material under different conditions with 12-phase AC arc

Yao, Yaochun; Yatsuda, Kazuyuki; Watanabe, Takayuki; Funabiki, Fuji; Yano, Tetsuji

doi:10.1016/j.cej.2008.06.039

Cited by 19 publications

(14 citation statements)

References 8 publications

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“…The reduction of the particle porosity is the main reason for particle shrinkage. Yao et al [4] estimated the residence time of injected particle in plasma. Under ideal conditions, the velocity of carrier gas at a flow rate of 20 l/min is 26 m/s and the residence time of particles along the centerline of nozzle is about 0.04 s from nozzle to substrate.…”

Section: Input Power Effect In 6-phase Arcmentioning

confidence: 99%

“…Among various kinds of thermal plasma reactors, multi-phase AC arc is more effective than other plasmas due to the following advantages: high energy efficiency, large plasma volume, low velocity, easy scale up, and low cost [4]. The high plasma temperature allows to process glass raw materials quickly enough to decrease the melting time.…”

mentioning

confidence: 99%

“…This can be achieved by releasing the decomposed gas from the raw material during powder injection. Under a New Energy and Industrial Technology Development Organization (NEDO) project, a new in-flight melting technology with multi-phase AC arc was successfully developed for the glass industry [4][5][6].…”

mentioning

confidence: 99%

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Characteristics of Multi-Phase Alternating Current Arc for Glass In-Flight Melting

Yao

Yatsuda

Watanabe

et al. 2009

Plasma Chem Plasma Process

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An innovative in-flight melting technology with multi-phase AC arc was developed for glass industry. The enthalpy probe and high speed video camera were used to characterize the temperature, velocity, and discharge behavior of multi-phase AC arc. The effects of input power and sheath gas flow rate on arc and melting behavior were investigated. Results show that the temperature and velocity on arc center are increased with input power or sheath gas flow increase. The fluctuation of luminance area ratio and coefficient of variation reflects the change of arc discharge behavior. High temperature of plasma enhances the melting of granulated raw particles during in-flight heating treatment. The shrinkage of particle and the volatilization degree of Na 2 O increase under a larger flow rate of sheath gas. The characterized arc behavior agrees with the melting behavior of glass raw materials, which can provide valuable guidelines for the process control of glass melting.

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Section: Input Power Effect In 6-phase Arcmentioning

confidence: 99%

mentioning

confidence: 99%

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Characteristics of Multi-Phase Alternating Current Arc for Glass In-Flight Melting

Yao

Yatsuda

Watanabe

et al. 2009

Plasma Chem Plasma Process

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“…Up to date, the batch melting process has never changed even in thermal plasma reactors. For the unique advantages, multiphase alternating current (AC) arc has been developed to apply to in‐flight glass melting for the purpose of energy saving and emission reduction . Raw glass powders are injected above the furnace and penetrate through the plasma region to be melted and vitrified within milliseconds.…”

Section: Introductionmentioning

confidence: 99%

Investigation of In‐Flight Glass Melting by Controlling the High‐Temperature Region of Multiphase AC Arc Plasma

Liu

Tanaka

Choi

et al. 2014

Int J of Appl Glass Sci

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A large volume discharge produced by a stable 12-phase alternating current (AC) arc plasma is preferable to melt the granulated glass materials for time and energy saving. The discharge behavior and the high-temperature region of the plasma system can be controlled by the electrode configurations. In this study, the spatial characteristics of the arc discharge were examined by image analysis with a high-speed camera. The melting characteristics of alkali-free glass particles were investigated by microscope and X-ray diffractometry. This is the first time to investigate the relationship between spatial characteristics of plasma and glass particle property. Results show the arc existence area is strongly related to the electrode configuration. Distributions of in-flight powders and the spatial characteristics of arc are important factors when using multiphase AC arc for in-flight melting. This study provides information of efficient particle treatment according to the electrode configuration.

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“…Under the support of the New Energy and Industrial Technology Development Organization (NEDO) in Japan, an innovative in-flight glass-melting technology was developed [1][2][3][4][5][6]. The concept of the in-flight melting for glass production is illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

Innovative in-flight glass-melting technology using thermal plasmas

Watanabe

Yatsuda

Yao

et al. 2010

Pure and Applied Chemistry

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A stable 12-phase AC arc was generated by transformers at a commercial electric power system, and the arc behavior was characterized by image analysis. For the unique advantages, the multiphase AC arc was developed to apply to in-flight glass melting for the purpose of energy-saving and emission reduction. The effects of electrode configuration and sheath gas flow rate on the arc and melting behavior of granulated glass raw material were investigated. Results show that the discharge behavior and the high-temperature region can be controlled by the electrode configuration. The luminance area of the high-temperature region and its fluctuation reflect the discharge behavior. The vitrification degree of glass raw material is mostly dependent on the center temperature of arc. As sheath gas flow rate increases, the ratio of luminance area decreases and the center temperature of arc increases.

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Investigation on in-flight melting behavior of granulated alkali-free glass raw material under different conditions with 12-phase AC arc

Cited by 19 publications

References 8 publications

Characteristics of Multi-Phase Alternating Current Arc for Glass In-Flight Melting

Characteristics of Multi-Phase Alternating Current Arc for Glass In-Flight Melting

Investigation of In‐Flight Glass Melting by Controlling the High‐Temperature Region of Multiphase AC Arc Plasma

Innovative in-flight glass-melting technology using thermal plasmas

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