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Vliv oxidacne-redukcnich rovnovah na interakce mezi plynnou fazi a sklovinou

By Marketa Rakova and Praha (Czech Republic) Vysoka skola chemicko-technologicka Praha

Abstract

This work deals with the examination on influence of the initial redox state of glass on the bubble formation and removing and on the feasibility of identification of bubble sources in a glass melting space. The numerical computation program REDOX was developed for the calculation of distribution of oxidation-reduction species in the non-isothermal melting space with flowing glass and used simultaneously with the program for the computation of glass temperatures and velocities in a glass melting space and with the procedure for calculation of trajectories, sizes and composition of bubbles. The soda-lime-silica glass containing iron ions and sulphates as well as glass for TV panels containing ions of antimony and cerium were used for the model calculations. The results of cacculations of multicomponent bubble behaviour at different initial values of redox state of glass at isothermal conditions have shown that the initial redox state of glass had an unambiguous impact both on the rate of bubble removing glass and on the final properties of bubbles, currently used for the identification of bubble sources in the glassmelting space. The calculations of distribution of redox species in the non-isothermal glass melting space was carried out to include the time temperature history of bubbles. The results show as well a distinct influence of the redox state of glass on the interaction between glassmelts and gases, corresponding to the results acquired at isothermal conditions. Generally, the increasing redox value increased the driving force of the oxygen transport into bubbles in the glass with the oxide refining agent while the driving force of refining gases into bubbles in glasses containing sulphates exhibited minimum value at the medium values of the initial redox state of glass. Regarding the significance of the redox state of glass for the identification of bubble sources in a glassmelting space, it was found that the redox value considerably influences both the s.c. stationary concentrations of gases in bubbles an the resulting pressure inside of bubbles, used for the source identification. The results indicate that the identification of bubbles coming from low temperature zones is more feasible than for those coming from high temperature parts. A knowledge base of the model bubble properties, based on the bubble computation in the non-isothermal flowing glass melt was as well presented. The knowledge base may be used for the identification of bubble defect sources in glass melting furnace using analogy between the modelled bubbles and industrial analysed bubblesAvailable from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi

Topics: 07B - Inorganic chemistry
Publisher: Praha : Vysoka skola chemicko-technologicka Praha
Year: 1997
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Provided by: OpenGrey Repository
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