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首页> 外文期刊>European Journal of Glass Science and Technology, PartA. Glass Technology >Thermal diffusivity of soda-lime-silica powder batch and briquettes
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Thermal diffusivity of soda-lime-silica powder batch and briquettes

机译：钠钙 - 二氧化硅粉末和压块的热扩散性

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摘要

The efficiency of heat transfer through glass batch is an important factor affecting the energy efficiency of glass manufacturing and product quality. In this study, we investigated the effective thermal diffusivity and heat flux through a batch blanket of powder raw materials and briquettes, by using a large scale top heated laboratory furnace. Particular focus was placed on the influence of raw material grain size and briquette size on the effective thermal diffusivity. The results obtained for both fine and coarse powder batches indicate that the effective thermal diffusivities are relatively unaffected by raw material grain size, and thus are not influenced by the reaction pathway and initial melt phase formation. On the other hand, analysis of the heat flux derived from conduction heat transfer (Q(c)) and heat flux passing through cavities between briquettes (Q(cav)) revealed that the briquette size has a strong influence on the effective thermal diffusivity of the batch blanket. The thermal diffusivity observed for flake-type briquettes (2-5.6 mm) is the same as for powder raw materials. The likely reason is that the contact heat resistance increases when many small briquettes are stacked in the batch blanket, and thus the conduction heat transfer is decreased. Clearly, for small briquettes of coarse raw materials (18.6 mm x 13.5 mm x 3.7 mm), the main factor for improving the thermal diffusivity was improving the conduction heat transfer. Additionally, for large briquettes of coarse raw materials (38 mm x 38 mm x 21 mm), the thermal diffusivity can be improved via both conduction and radiant heat transfers through the cavities between briquettes. The results clarified that both Q(c) and Q(cav) can be effectively tuned by adjusting the briquettes size. In addition, the meltable amount per unit area may be increased compared to the powder raw material, by melting the briquettes with a batch blanket of appropriate thickness.
机译：通过玻璃批量的热传递效率是影响玻璃制造和产品质量的能效的重要因素。在这项研究中，我们通过使用大规模的顶部加热的实验室炉来调查通过粉末原料和压块的批量橡皮泥的有效热扩散和热通量。对原材料粒度和压块尺寸的影响进行了特别的重点。为细小粉末批次获得的结果表明有效的热扩散性相对不受原料粒度的影响，因此不受反应途径和初始熔体相形成的影响。另一方面，通过压轮（Q（c）之间的传热（Q（c））和通过空腔的热通量的分析显示，压块尺寸对有效的热扩散性具有很强的影响批量毯。为薄片式成煤（2-5.6mm）观察到的热扩散率与粉末原料相同。可能的原因是，当许多小煤层堆叠在批料中时，接触耐热性增加，因此导电传热减小。显然，对于小型粗原料（18.6mm×13.5mm×3.7mm），提高热扩散率的主要因素正在改善传热。另外，对于粗原料的大型圆形（38mm×38mm×21mm），可以通过传导和辐射热传递通过聚块之间的空腔来改善热扩散率。结果澄清了Q（C）和Q（CAV）可以通过调节膨胀尺寸有效地调整。另外，通过用适当厚度的批次橡皮泥熔化压块，可以增加每单位面积的可熔金量。

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