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論文題目「Investigation of In-flight Melting Behavior of Granulated Glass Raw
Materials by Thermal Plasmas」
Liu Yaping
An innovative in-flight glass melting technology was developed for a purpose of energy saving and environmental protection. Granulated raw materials with small diameter were treated by heating of thermal plasma and be vitrified within several milliseconds. Two types of heating sources, twelve-phase AC arc and hybrid plasma, were developed to investigate the in-flight melting behavior of the granulated powders. The glass vitrification degree, morphology, size distribution and composition of the melted powders were characterized.
In chapter 2, the stable twelve-phase AC arc with 100 mm in diameter was obtained under the power of 46 kW. An innovative in-flight melting technology was successfully developed to melt granulated the granulated soda-lime glass and alkali-free raw materials and the effect of powder feed rate on the in-flight particle behavior were investigated. Experimental results show that the high vitrification degree of soda-lime glass was almost finished within milliseconds. The high decomposition of prepared powders reveals that the new in-flight melting can reduce energy consumption and shorten the production cycle. In addition, compared with the traditional air-fuel firing, the gas emission produced by thermal plasmas melting is less due to no use of fossil fuel.
In chapter 3, a hybrid plasma apparatus combining the multi-phase AC arc with an oxygen burner has been developed to improve glass melting efficiency and quality. The melting behavior by the multi-phase AC arc and the hybrid plasma was investigated by the analysis of the collected powders after in-flight heat treatment. Obtained results indicate as follows: (1) vitrification reaction was complete in the case of the alkali-free glass treated by the hybrid plasma; (2) the hybrid plasma heat treatment leads to lower volatilization degree of B2O3 than the multi-phase AC arc at the same vitrification degree. The hybrid plasma, therefore, is expected to be a promising heat source for the in-flight melting technology.
In the future work, on-line measurement of in-flight hot particle parameters (temperature, velocity and size) by sensors will be studied. The particle measurements will be carried out by DPV-2000 (Tecnar, Canada) and spectroscopy. The temperature and the residence time in the plasma region using different heating sources will be studied and the characteristics of melting particles will be compared.
修士論文の内容は2010年3月14日にテレビ朝日の「マルミセ！百聞一見録」にてテレビ放映されました。
修士論文の内容は2010年10月27日にテレビ東京の「モーニングサテライト」にてテレビ放映されました。
2010年7月 Best Poster Award of 10th Asia-Pacific Conference on Plasma Science and Technologyを受賞しました．受賞対象の研究発表は「In-Flight Melting Behavior of Different Glass raw Materials by Hybrid Heating of Twelve-Phase AC Arc with Oxygen Burner」です．
