The world’s leading countries develop dry slag granulation units that are capable of producing solid slag granules and recovering the sensible heat of slag. The main element of such units is a granulation chamber where molten slag is atomized and solidified. In this chamber, up to 30% of the sensible heat of the molten slag is extracted. To recover more heat, the solid granules from the granulation chamber should be fed to fluidized beds. The more there are such beds, the better the granulated slag can be cooled and, therefore, the more heat can be recovered. Foreign publications on dry slag granulation do not provide methods for designing fluidized beds for dry slag granulation units. A method for analyzing the heat transfer in fluidized beds during cooling of slag granules by counter airflow is presented. The method allows determining the heat flow from the slag to the air in fluidized beds and the temperatures of the slag and air exiting the fluidized beds. Recommendations on choosing the airflow velocity, the rational mass of slag in one fluidized bed, the number and dimensions of beds and evaluating air pressure losses in fluidized beds are formulated. It is shown that three fluidized beds in a dry slag granulation unit are sufficient to recover up to 92% of the sensible heat of slag.

中文翻译：

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干渣造粒装置中流化床的传热

世界领先国家开发了能够生产固体渣颗粒和回收渣显热的干法渣造粒机组。这种装置的主要元件是造粒室，熔渣在其中雾化和固化。在该室中，熔渣的显热高达 30%。为了回收更多的热量，应将造粒室中的固体颗粒送入流化床。这样的床越多，粒状炉渣冷却得越好，因此，可以回收更多的热量。国外关于干渣造粒的出版物没有提供设计干渣造粒装置流化床的方法。提出了一种分析逆流冷却炉渣颗粒过程中流化床传热的方法。该方法允许确定从炉渣到流化床中空气的热流以及离开流化床的炉渣和空气的温度。对气流速度的选择、一个流化床中炉渣的合理质量、床的数量和尺寸以及评估流化床中的空气压力损失提出了建议。结果表明，干渣造粒装置中的三个流化床足以回收高达 92% 的渣显热。