铁矿石粉料冷却装置的结构分析及其冷却过程研究

发布时间：2019-06-01 21:17

【摘要】：近年来,中国受工业经济迅猛发展和中产阶级膨胀推动的作用,能源消耗费已经占到了全球能源消费总量的21%,成为最大的能源消费国,但人均能源消耗和单位GDP的能源消耗都处在较低水平,说明中国的能源利用效率有待提高。冷却装置是高效的节能装置,但现有的冷却装置不能很好的应对铁矿石的绝氧冷却要求。首先,对滚筒冷却装置的各个主要部件进行需求分析,并融入铁矿石粉料的特点,分析所需相应的结构形式,并对比了各动密封形式的优劣后选取波纹管动密封结构将其应用到进料口结构上。通过对冷却装置传热过程的计算,求出冷却过程的物料和冷却水温度变化和热交换量随时间的变化曲线,提出在冷却铁矿石这类需要迅速降温的物料时,应选择使用冷却水与物料流向相反方式的冷却装置进行冷却处理。其次,对滚筒中的高温物料颗粒进行运动受力分析,并简化其运动过程,推导出停留时间与其他装置参数的关系式,并以此确定装置对物料停留时间的影响参数,进而通过模型求出参数对停留时间的实际影响效果,并分析其产生原因,提出部分参数选择的建议和约束。最后,分析了铁矿石粉料在冷却装置中的换热过程,并运用傅立叶定律、斯忒藩—波耳曼定律和牛顿冷却定律中体现的换热关系建立数值模型,迭代求出冷却装置的出力及出料温度受装置参数的影响曲线,分析总结其产生原因,为后续针对铁矿石粉料的冷却装置结构的优化提供依据。通过梳理上述的分析结果,总结出针对铁矿石粉料冷却装置的优化方案,并拓展至一般的应用场景。
[Abstract]:In recent years, driven by the rapid development of industrial economy and the expansion of the middle class, China has accounted for 21% of the total global energy consumption, becoming the largest energy consumer. However, the per capita energy consumption and the energy consumption per unit of GDP are at a relatively low level, indicating that China's energy efficiency needs to be improved. The cooling device is an efficient energy-saving device, but the existing cooling device can not meet the absolute oxygen cooling requirements of iron ore. First of all, the demand analysis of the main components of the drum cooling device is carried out, and the characteristics of iron ore powder are integrated, and the corresponding structural forms are analyzed. After comparing the advantages and disadvantages of each dynamic seal form, the bellows dynamic seal structure is selected to apply it to the feed port structure. Through the calculation of the heat transfer process of the cooling device, the curves of the temperature change of the cooling process and the cooling water temperature and the heat exchange capacity with time are obtained, and it is proposed that when cooling the iron ore, this kind of material needs to be cooled rapidly. Cooling devices with opposite cooling water and material flow should be selected for cooling treatment. Secondly, the moving force of high temperature material particles in the drum is analyzed, and the motion process is simplified, the relationship between residence time and other device parameters is deduced, and the influence parameters of the device on the residence time of the material are determined. Furthermore, the actual effect of parameters on residence time is obtained through the model, and the causes are analyzed, and some suggestions and constraints for parameter selection are put forward. Finally, the heat transfer process of iron ore powder in the cooling device is analyzed, and the numerical model is established by using the heat transfer relationship embodied in Fourier law, Stefan-Bolman's law and Newton's cooling law. The influence curve of the output force and the discharge temperature of the cooling device by the parameters of the device is obtained iteratively, and the causes are analyzed and summarized, which provides the basis for the subsequent optimization of the structure of the cooling device for iron ore powder. By combing the above analysis results, the optimization scheme of iron ore powder cooling device is summarized and extended to the general application scenario.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD45

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