BGSM6026型立式磨流场分析与结构优化

发布时间：2018-06-06 12:48

本文选题：立式磨流场 + 过粉　；参考：《内蒙古科技大学》2015年硕士论文

【摘要】：立磨自问世以来已有二十多年的历史。立式磨相对于其他粉碎设备具有节能，高产，噪声小，效率高，破碎能力强、占地面积小、操作流程简单等优点。由于其集诸多优点于一身，自问世以来就越来越受到水泥生产界的重视。现今立式辊磨机已经成为现今水泥行业的主旋律，为当今社会的发展建设发挥着巨大作用。本文立足于包钢新开发并已经设计完毕的BGSM6026立式磨，结合当今流行的Solidworks、ANSYS等专业仿真软件对其流场进行分析。针对立磨相关技术的研究现状及存在的问题，系统地研究了大型立磨数值分析方法，为设计开发大型立磨提供理论基础和方法支持；本文通过FLUENT计算流体力学分析平台，研究了大型立磨流场特性，得到了立磨工作时磨内的速度场、温度场、压力场、流场流线和颗粒轨迹等特性，并做了详尽的解释，为进一步提高粉磨及选粉效率提供依据。本文对立式磨进风量参数进行了改变并再次仿真，通过对比不同进风量来观察立磨流场的气流变化规律。对以后立式磨进风量的大小的设定提供了依据。分析过程中发现了在灰斗下端，气流的流动比湍动现象比较严重，易形成大量涡流。粉体输运过程中由于过粉现象使许多合格的颗粒进行了多次的循环碾压，造成了不必要的能量消耗，而这部分的能量消耗在立式磨的能量损失中占有很大比例，且影响粉体的输运效率。过粉现象是由于立式磨流场结构的不完善，，使其在输运过程中出现很多问题。为了使过粉现象降低，需对立式磨流场的结构进行改进。通过在灰斗周围加上螺旋的叶片来阻挡颗粒重新落回磨盘。通过分析可以看出，立式磨流场的结构对过粉现象影响非常明显，而对立式磨结构的改进可明显改善过粉现象。通过对比改进前后加入颗粒相的多方面的数据信息，据粗略估算过粉量比以前减少大约百分之二十以上。
[Abstract]:The vertical mill has a history of more than 20 years since it came out. The vertical mill has the advantages of energy saving, high output, low noise, high efficiency, strong crushing ability, small area, simple operation flow and so on. Because of its many advantages, it has been paid more and more attention by cement industry since it came out. Nowadays the vertical roller mill has become the main melody of the cement industry and plays a great role in the development and construction of today's society. This paper is based on the BGSM6026 vertical mill which has been designed and developed by Baotou Iron and Steel Co., Ltd., and analyzes its flow field with the help of the popular Solidworks ANSYS and other professional simulation software. In view of the research status and existing problems of vertical mill technology, the numerical analysis method of large vertical mill is studied systematically, which provides the theoretical basis and method support for the design and development of large vertical mill. The characteristics of flow field of large vertical mill are studied, and the characteristics of velocity field, temperature field, pressure field, flow field streamline and particle trajectory in vertical mill are obtained, and detailed explanations are made to provide the basis for further improving grinding and milling efficiency. In this paper, the parameters of inlet air volume of vertical mill are changed and simulated again, and the flow field of vertical mill is observed by comparing different inlet air volume. It provides the basis for setting the air volume of the vertical mill in the future. In the process of analysis, it is found that at the lower end of the ash hopper, the flow of air is more serious than that of turbulence, and a large number of eddy currents are easily formed. In the process of powder transportation, many qualified particles are compacted repeatedly because of the phenomenon of excessive powder, which results in unnecessary energy consumption, which accounts for a large proportion of the energy loss in vertical grinding. And the transport efficiency of powder is affected. The phenomenon of powder passing is due to the imperfect structure of the vertical mill flow field, which causes many problems in the transportation process. In order to reduce the phenomenon of pulverization, the structure of vertical mill flow field should be improved. A spiral blade is added around the ash bucket to prevent the particles from falling back into the mill. It can be seen from the analysis that the structure of the flow field of vertical mill has a very obvious effect on the phenomenon of pulverization, while the improvement of the structure of vertical mill can obviously improve the phenomenon of overpowder. By comparing the various data information of adding granular phase before and after the improvement, the amount of overpowder was roughly estimated to be more than 20% less than that before.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ172.632.5

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