摘要
玻璃的钢化品质是其质量要求的重要标准,其中玻璃加热是重要的影响因素之一,为了优化玻璃加热过程的生产工艺,需对加热炉内玻璃的温变规律开展研究。本文基于玻璃加热后表面温度不均匀性测试,建立了玻璃-热气流相互作用的换热-传热物理模型,数值模拟了全对流加热炉内玻璃的温度变化规律。结果表明:在加热过程中,玻璃内外温度均升高,但升温速率逐渐减小;玻璃任意位置的温度与平均温度的差值先是迅速增大,而后逐渐减小,但不同位置的温度差值变化规律差异明显,即玻璃加热温度不均匀,这主要是受风孔位置及辊道等影响,特别是辊道影响尤为显著,因此,如何消除加热炉内辊道对玻璃受热的影响是提高玻璃加热均匀性的关键。
The tempering quality of glass is an important standard of its quality requirement, among which glass heating is one of the important influencing factors. In order to optimize the production technology of glass heating process, it is necessary to study the law of glass temperature variation in heating furnace. Based on the measurement of surface temperature inhomogeneity after glass heating, a physical model of heat exchange-heat transfer was established, and the temperature variation of glass in total convection heating furnace was numerically simulated. The results show that during the heating process, the surface and center temperatures of the glass both increase, but the heating rate decreases gradually. The difference between the temperature of glass at any position and the average temperature increases rapidly and then decreases gradually. However, the variation of temperature difference between different positions is obvious, that is, the temperature of glass heating is inhomogeneous, which is mainly affected by the location of the nozzles and the roller, of which the influence of roller is particularly significant. Therefore, how to eliminate the influence of roller on glass heating is the key to improve the heating uniformity of glass.
引文
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