Simulation And Optimization Study Of The Protective Gas Distribution In Tin Bath

In order to product excellent performance float glass, Apart from melting itself well,the bright and clean of tin surface is a prerequisite. Tin bath is the main equipment of float glass manufacturing technology, the melting glass liquid flow into tin bath and complete smoothing and spreading relying on surface tension and gravity at a certain temperature regime. Because of the high temperatures, there will react complex physical and chemical reaction to produce tin oxide(SnO2、SnO).Tin oxide seriously pollute glass to product fog point, optical distortion, wetting and other defects. Therefore inlet inert and reducing gas to prevent liquid tin oxide. Protective gas velocity in the tin bath and the temperature distribution of the glass-forming quality is particularly important.In this paper, regard tin bath shielding gas corresponding to a daily melting capacity of 600 t float glass production line as the research object. Use ANSYS-Fluent software to carry out a system simulation, including the analysis and comparison of two models and make optimization by adding a separate device and adjust volume.Analyzed representative cross-sections of the simulation results. Obtained specific gas flow form and distribution of velocity and temperature about the two models. By comparison, in the model of gas inlet from both sides,the second area sealed needs to be more strengthened. For the temperature distribution, because the cracks between the blocks preheating effect, is more energy-efficient. However, due to the presence of underlying reflux low temperature gas, level temperature and hydrogen content distribution is uneven. In order to optimize gas distribution, added two separate devices in the gas inlet from brick joints model. Separate devices barrier reflow protective gas to a certain extent, so that the temperature distribution around improved and distribution of hydrogen content is more uniform. In addition, by adjusting the ratio of the introduced gas to optimize. Results showed that the temperature of protective gas in tin bath is more evenly than the original distribution near the glass surface, and the hydrogen content distribution at the inlet end of the tin bath becomes more uniform. The hydrogen content over tin exposed surface side and the outlet is increased. This will help to reduce pollution of the tin solution, improve the utilization of hydrogen.