本文選題：渦輪氣流分級(jí)機(jī) + 工藝參數(shù)　； 參考：《西南科技大學(xué)》2017年碩士論文

【摘要】：目前,超細(xì)粉體材料正在滲入整個(gè)工業(yè)部門(mén)和高技術(shù)領(lǐng)域,更被譽(yù)為現(xiàn)代高新技術(shù)的原點(diǎn),已應(yīng)用到化工、輕工、冶金、電子、高技術(shù)陶瓷、生物醫(yī)學(xué)以及國(guó)防尖端技術(shù)等領(lǐng)域。用粉碎法生產(chǎn)超細(xì)粉體,很難一次通過(guò)粉碎就能達(dá)到所需粒度要求,必須要通過(guò)分級(jí)的方式將粒度達(dá)到要求的產(chǎn)品分離出來(lái)加以利用。因此能夠控制分級(jí)粒徑,提高分級(jí)精度,對(duì)超細(xì)粉體材料的制備來(lái)說(shuō)具有重要意義。渦輪氣流分級(jí)機(jī)是一種典型的干法超細(xì)粉分級(jí)設(shè)備,由于其分級(jí)范圍廣、分級(jí)精度高等優(yōu)點(diǎn)在超細(xì)粉體工業(yè)中應(yīng)用十分廣泛。但從目前的文獻(xiàn)來(lái)看,對(duì)渦輪氣流分級(jí)機(jī)的工藝參數(shù)研究還存在不足。本文對(duì)渦輪氣流分級(jí)機(jī)的相關(guān)理論、結(jié)構(gòu)進(jìn)行了介紹,將現(xiàn)有國(guó)內(nèi)外先進(jìn)的氣流分級(jí)機(jī)進(jìn)行了分類說(shuō)明。對(duì)現(xiàn)有的分級(jí)機(jī)性能評(píng)價(jià)指標(biāo)進(jìn)行了分析,在現(xiàn)有指標(biāo)的基礎(chǔ)上進(jìn)行了改進(jìn),得到了一種適用于工程領(lǐng)域的分級(jí)機(jī)性能評(píng)價(jià)指標(biāo)。針對(duì)分級(jí)機(jī)二次風(fēng)清洗參數(shù)進(jìn)行了實(shí)驗(yàn)研究,得出了分級(jí)機(jī)二次風(fēng)量、二次風(fēng)上升氣流速度對(duì)分級(jí)機(jī)相對(duì)分級(jí)精度的影響規(guī)律。由實(shí)驗(yàn)結(jié)果可知,LNJ-36A系列渦輪氣流分級(jí)機(jī)的最佳二次風(fēng)量為150m3/h,最佳二次風(fēng)量下的最優(yōu)二次風(fēng)上升氣流速度為3.91~4.73m/s,分級(jí)機(jī)調(diào)隙錐的最優(yōu)間隙值為12.5~15mm。為了更好地分析實(shí)驗(yàn)現(xiàn)象,對(duì)分級(jí)機(jī)二次風(fēng)清洗區(qū)域的流場(chǎng)進(jìn)行了數(shù)值模擬,得出分級(jí)機(jī)二次風(fēng)有效清洗區(qū)域?yàn)?~110mm,同時(shí)得到了二次風(fēng)清洗區(qū)域的流場(chǎng)分布規(guī)律。針對(duì)分級(jí)機(jī)端面密封參數(shù)進(jìn)行了實(shí)驗(yàn)研究,得出了分級(jí)機(jī)端面密封間隙、氣流密封壓力對(duì)分級(jí)機(jī)相對(duì)分級(jí)精度的影響規(guī)律。由實(shí)驗(yàn)結(jié)果可知,LNJ-36A系列渦輪氣流分級(jí)機(jī)的適宜端面密封間隙為3mm,其最佳氣流密封壓力為0.15MPa。同時(shí)通過(guò)對(duì)分級(jí)機(jī)端面密封區(qū)域流場(chǎng)的數(shù)值模擬,得出氣流密封失效壓力為0.05MPa,同時(shí)得到了有無(wú)氣封的流場(chǎng)情況,為實(shí)驗(yàn)結(jié)果作出了進(jìn)一步解釋。
[Abstract]:At present, ultrafine powder materials are infiltrating into the entire industrial sector and high-tech fields, and are also regarded as the origin of modern high and new technology. They have been applied to chemical, light, metallurgical, electronic, high-tech ceramics,Biomedicine and defense cutting-edge technology and other areas.It is difficult to achieve the required particle size by grinding the ultrafine powder in one time, and it is necessary to separate and utilize the products with the required particle size by means of classification.Therefore, it can control the particle size and improve the classification accuracy, which is of great significance to the preparation of ultrafine powder materials.Turbine airflow classifier is a typical dry ultrafine powder classifier. It is widely used in ultrafine powder industry because of its wide classification range and high classification accuracy.However, according to the current literature, the research on the technological parameters of the turbine airflow classifier is still insufficient.In this paper, the theory and structure of turbine classifier are introduced, and the advanced airflow classifiers at home and abroad are classified and explained.The existing performance evaluation index of classifier is analyzed and improved on the basis of the existing index, and a performance evaluation index suitable for engineering field is obtained.Based on the experimental study of the secondary air cleaning parameters of the classifier, the influence of the secondary air volume and the secondary air updraft velocity on the relative classification accuracy of the classifier is obtained.The experimental results show that the optimal secondary air flow rate of LNJ-36A series turbine air classifier is 150 m3 / h, the optimal secondary air flow velocity is 3.91 ~ 4.73 m / s, and the optimal clearance value of the clearance cone of classifier is 12.5 ~ 15 m ~ (-1) m ~ (-1) 路L ~ (-1) 路L ~ (-1) 路L ~ (-1) 路L ~ (-1) 路L ~ (-1) 路L ~ (-1) 路L ~ (-1) 路L ~ (-1).In order to better analyze the experimental phenomena, the flow field in the secondary air cleaning area of the classifier is numerically simulated. It is concluded that the effective cleaning area of the secondary air of the classifier is 0 ~ 110mm, and the flow field distribution law of the secondary air cleaning area is obtained.Based on the experimental study on the sealing parameters of the end face of the classifier, the influence of the seal clearance on the end face of the classifier and the pressure of the airflow seal on the relative classification accuracy of the classifier is obtained.The experimental results show that the suitable end face seal clearance of LNJ-36A series turbine airflow classifier is 3 mm and the optimum airflow seal pressure is 0.15 MPA.Through the numerical simulation of the flow field in the sealing area of the end face of the classifier, the failure pressure of the airflow seal is obtained to be 0.05MPa, and the flow field with or without the gas seal is obtained, which further explains the experimental results.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB44

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