镁还原罐内强化换热研究

通过分析传统球团料在还原罐内的温度分布,提出了以改进布料方式缩短硅热法炼镁还原周期的必要性.研发了一种新型炼镁料块,运用FLUENT软件对料块的传热过程进行数值模拟,分别研究了料块的高度、外缘高度、内孔直径、上下面直径、凹槽直径和凹槽个数对料块传热过程和镁产量的影响.发现当料块的高度为100 mm、外缘高度为50 mm、内径为100 mm、上下面直径为200 mm、凹槽直径为50 mm和凹槽个数为8个时,单炉镁产量最高为318 kg.h-1,较传统球团料提高43.9%,吨镁煤气消耗量降低了30.5%.通过实验得出料块内部的温度分布与数值模拟的结果一致,说明数值模拟的模型是可靠的.

Enhancement of heat transfer in a magnesium reduction retort

By analyzing the temperature distribution of traditional briquetting in a magnesium reduction retort,it is necessary to improve the briquetting’s shape to shorten the reduction cycle of the magnesium silicon thermal reduction method.The heat transfer process of a new-type briquetting for magnesium reduction was simulated by FLUENT software,with focus on the influence of the briquetting’ height,edge height,inner diameter,bottom diameter,notch diameter and notch number on the heat transfer process and the magnesium output.It is found that the maximum magnesium output is 318 kg·h-1 when the briquetting’s height is 100 mm,the edge height is 50 mm,the inner diameter is 100 mm,the bottom diameter is 200 mm,the notch diameter is 50 mm,and the notch number is 8.Compared with the traditional briquetting,the magnesium output increases by 43.9% and the gas consumption for per ton magnesium decreases by 30.5%.The internal temperature distribution of the briquetting in the experiment is consistent with the simulation results,indicating that the model of numerical simulation is reliable.