TY - JOUR
T1 - Investigation on in-flight melting behavior of granulated alkali-free glass raw material under different conditions with 12-phase AC arc
AU - Yao, Yaochun
AU - Yatsuda, Kazuyuki
AU - Watanabe, Takayuki
AU - Funabiki, Fuji
AU - Yano, Tetsuji
N1 - Funding Information:
Due to some unique advantages such as high enthalpy, high chemical reactivity, alterable oxidation or reduction atmosphere, easy and rapid generation of high temperature as well as the rapid quenching rate [4] , thermal plasmas have been developed in many fields ranging from materials processing to the destruction of toxic wastes [5–7] . Among various kinds of thermal plasma reactors, multi-phase arc is more effective than radio-frequency (RF) plasma due to the following advantages: cheap equipment investment, feasible mass production, and high energy efficiency [8] . It has been applied in the welding and cutting of metals, steelmaking, synthesis of nanoparticles and spheriodization of particles [9] . Under the financial support of New Energy and Industrial Technology Development Organization (NEDO) project, a new in-flight glass melting technology with 12-phase AC arc was developed. The granulated glass raw material was injected into arc plasma and melted by surrounding high temperature in the process of in-flight heating. Compared with above-mentioned conventional technology, the in-flight glass melting technology mainly utilizes conduction heating. This fully changes the traditional radiation heating and improves the thermal efficiency. The granulated raw material increases the velocity of homogenization of molten glass. The high temperature (5000–10 000 °C) generated by arc plasma enables it easy to melt the glass raw material quickly to shorten production cycle and save energy. The decomposition of raw material during flight decreases the forming of bubbles in molten glass to reduce the refining time. The usage of electric power lights the burden of environmental responsibility. In addition, the equipment using the new technology is smaller and cheaper. Hence, the innovative in-flight glass melting technology with 12-phase AC arc can be used to produce some special glass products or accelerate the production cycle of ordinary glass as a subsidiary heat source.
Funding Information:
The financial support provided by Strategic Development of Energy Conservation Technology Project of NEDO (New Energy and Industrial Technology Development Organization) is gratefully acknowledged.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008/10/15
Y1 - 2008/10/15
N2 - An innovative in-flight melting technology with 12-phase alternating current (AC) arc has been developed to investigate the melting behavior of granulated alkali-free glass raw material. Results show that the melted particles have spherical shape with smooth surface and compact structure. Lower vitrification and decomposition degrees of raw material as well as lower volatilization of B2O3 are attributed to less heat transferred per particle under larger flow rate of carrier gas and higher feed rate. The high vitrification and decomposition degrees indicate that the new in-flight glass melting with 12-phase AC arc will be a promising technology for glass production.
AB - An innovative in-flight melting technology with 12-phase alternating current (AC) arc has been developed to investigate the melting behavior of granulated alkali-free glass raw material. Results show that the melted particles have spherical shape with smooth surface and compact structure. Lower vitrification and decomposition degrees of raw material as well as lower volatilization of B2O3 are attributed to less heat transferred per particle under larger flow rate of carrier gas and higher feed rate. The high vitrification and decomposition degrees indicate that the new in-flight glass melting with 12-phase AC arc will be a promising technology for glass production.
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U2 - 10.1016/j.cej.2008.06.039
DO - 10.1016/j.cej.2008.06.039
M3 - Article
AN - SCOPUS:52149111366
SN - 1385-8947
VL - 144
SP - 317
EP - 323
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
IS - 2
ER -