本文選題：立式磨流場(chǎng) + 過(guò)粉　； 參考：《內(nèi)蒙古科技大學(xué)》2015年碩士論文

【摘要】：立磨自問(wèn)世以來(lái)已有二十多年的歷史。立式磨相對(duì)于其他粉碎設(shè)備具有節(jié)能，高產(chǎn)，噪聲小，效率高，破碎能力強(qiáng)、占地面積小、操作流程簡(jiǎn)單等優(yōu)點(diǎn)。由于其集諸多優(yōu)點(diǎn)于一身，自問(wèn)世以來(lái)就越來(lái)越受到水泥生產(chǎn)界的重視。現(xiàn)今立式輥磨機(jī)已經(jīng)成為現(xiàn)今水泥行業(yè)的主旋律，為當(dāng)今社會(huì)的發(fā)展建設(shè)發(fā)揮著巨大作用。 本文立足于包鋼新開(kāi)發(fā)并已經(jīng)設(shè)計(jì)完畢的BGSM6026立式磨，結(jié)合當(dāng)今流行的Solidworks、ANSYS等專業(yè)仿真軟件對(duì)其流場(chǎng)進(jìn)行分析。針對(duì)立磨相關(guān)技術(shù)的研究現(xiàn)狀及存在的問(wèn)題，系統(tǒng)地研究了大型立磨數(shù)值分析方法，為設(shè)計(jì)開(kāi)發(fā)大型立磨提供理論基礎(chǔ)和方法支持；本文通過(guò)FLUENT計(jì)算流體力學(xué)分析平臺(tái)，研究了大型立磨流場(chǎng)特性，得到了立磨工作時(shí)磨內(nèi)的速度場(chǎng)、溫度場(chǎng)、壓力場(chǎng)、流場(chǎng)流線和顆粒軌跡等特性，并做了詳盡的解釋，為進(jìn)一步提高粉磨及選粉效率提供依據(jù)。 本文對(duì)立式磨進(jìn)風(fēng)量參數(shù)進(jìn)行了改變并再次仿真，通過(guò)對(duì)比不同進(jìn)風(fēng)量來(lái)觀察立磨流場(chǎng)的氣流變化規(guī)律。對(duì)以后立式磨進(jìn)風(fēng)量的大小的設(shè)定提供了依據(jù)。分析過(guò)程中發(fā)現(xiàn)了在灰斗下端，氣流的流動(dòng)比湍動(dòng)現(xiàn)象比較嚴(yán)重，易形成大量渦流。粉體輸運(yùn)過(guò)程中由于過(guò)粉現(xiàn)象使許多合格的顆粒進(jìn)行了多次的循環(huán)碾壓，造成了不必要的能量消耗，而這部分的能量消耗在立式磨的能量損失中占有很大比例，且影響粉體的輸運(yùn)效率。過(guò)粉現(xiàn)象是由于立式磨流場(chǎng)結(jié)構(gòu)的不完善，，使其在輸運(yùn)過(guò)程中出現(xiàn)很多問(wèn)題。為了使過(guò)粉現(xiàn)象降低，需對(duì)立式磨流場(chǎng)的結(jié)構(gòu)進(jìn)行改進(jìn)。通過(guò)在灰斗周圍加上螺旋的葉片來(lái)阻擋顆粒重新落回磨盤(pán)。通過(guò)分析可以看出，立式磨流場(chǎng)的結(jié)構(gòu)對(duì)過(guò)粉現(xiàn)象影響非常明顯，而對(duì)立式磨結(jié)構(gòu)的改進(jìn)可明顯改善過(guò)粉現(xiàn)象。通過(guò)對(duì)比改進(jìn)前后加入顆粒相的多方面的數(shù)據(jù)信息，據(jù)粗略估算過(guò)粉量比以前減少大約百分之二十以上。
[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.
【學(xué)位授予單位】：內(nèi)蒙古科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ172.632.5

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