Optimum energy distribution in a simulated 3D flow-through model for glass melt homogenization
Lukas Hrbek*,1, Lubomír Nemec2
In this paper, we optimize the utilization of the melting module space for simultaneous dissolution of sand relicts and fining. To do so, we optimize the energy distribution and consequently, the character of glass flow, by application of the software Glass Model and procedure for calculation of the utilization. The module model was fed by inhomogeneous glass melt (1320°C) on the input side across the melt level and taken away as homogenized glass melt (1420°C) on the output side. Energy was delivered into the melt by a central longitudinal row of electrodes through the space length and the energy proportion between input and following melting part was changed.
The maximum module melting performance and minimum specific heat losses were found as a function of this energy distribution, the optimum being at the 80% for the input part and 20% for the melting one. The relevant optimal character of the flow was described as a combination of approximately uniform flow and transversal circulations providing a helical-like flow. The regions of beneficial melt flow were then calculated as a function of the energy ratio and melt flow rate. The simplified relations were derived which predict the melt flow type and the development of the melt velocity components when changing energy distribution and flow rate. The results of these simplified relations were in agreement with the optimal results of numerical simulation and provided general relations between melting kinetics and flow character in the module space.
The results suggest that glassworks should devote an extensive interest to the proper character of the melt flow and consequently, to the special energy distribution in the melting space, if high melting performance and low specific heat losses have to be achieved.
1 Laboratory of Inorganic Materials, Joint Workplace of the University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic
2 The Institute of Rock Structure and Mechanics of the ASCR, v.v.i., V Holešovickách 41, 182 09 Prague 8, Czech Republic