High-temperature analogy experimental investigation on dry granulating characteristic of rotating disk for waste heat utilization of molten slag
High-temperature analogy experimental investigation on dry granulating characteristic of rotating disk for waste heat utilization of molten slag
复制标题
熔渣余热利用转盘干法制粒特性高温模拟实验研究
DOI：
10.1016/j.applthermaleng.2017.07.075
复制
发表时间：
2017-10-01
影响因子：
6.4
通讯作者：
Yang, Xinjun
中科院分区：
文献类型：
--
作者：
Wang, Dongxiang;Ling, Xiang;Yang, Xinjun
干法造粒是最有前途的熔融炉渣余热利用方法之一。渣粒的净热回收效率和回收成本主要取决于粒化特性。以铝液为介质，采用旋转圆盘法进行了高温模拟实验。结果表明，随着进料量和冷却风量的增加，转速的降低，颗粒的平均粒径增大。冷却风量对主要颗粒的粒度分布影响不大，但降低了产品收率。颗粒的圆度形状因子主要受转速、冷却风量和颗粒表面氧化膜的影响。液膜破碎方式和颗粒冷却速率对纤维的形成有重要影响。在完全韧带模式下，产生较低的质量分数的长丝，而长丝迅速增加，一旦液膜打破由片模式。建议在高炉矿渣粒化过程中，转速应直接影响矿渣的颗粒特性，并应严格控制冷却风量。(C)2017年。lsevier Ltd.保留所有权利。
Dry granulation process is one of the most promising methods for waste heat utilizing from molten slag. The net heat recovery efficiency and recycling costs of slag particles are mainly governed by the granulating characteristic. This paper performed a high-temperature analogy experiment by rotating disk with molten aluminum as the medium. The results indicated that the mean size of particles grew with the increasing of feed rate and cooling air rate, decreasing in rotating speed. The cooling air rate showed a little effect on the size distribution of the main particles, while lowered the production yield. The circularity shape factor of particles was mainly influenced by the rotating speed, cooling air rate and the oxide film formed on the particle surface. The liquid film breakup mode and cooling rate of particles played significant roles in the formation of filaments. In the fully-ligament mode, lower mass fraction of filaments was generated, while the filaments increased rapidly once the liquid film broke up by sheet mode. It was suggested in the granulation of blast furnace slag that, the particle characteristics should directly be governed by rotating speed, and the cooling air rate must be controlled strictly. (C) 2017. lsevier Ltd. All rights reserved.