發(fā)布時(shí)間：2018-05-11 21:31

  本文選題：選粉機(jī) + 分級(jí)特性��； 參考：《西南科技大學(xué)》2015年碩士論文

【摘要】：窄粒徑產(chǎn)品由于具有特殊的性能而被廣泛的運(yùn)用,為了滿足對(duì)窄粒徑產(chǎn)品的廣泛需求,解決窄粒徑產(chǎn)品的制備的問(wèn)題就顯得尤為重要。利用選粉機(jī)制備窄粒徑產(chǎn)品的關(guān)鍵點(diǎn)是:選粉機(jī)的分級(jí)性能和制備工藝。本文在利用數(shù)值模擬研究選粉機(jī)分級(jí)特性的基礎(chǔ)上,對(duì)選粉機(jī)的參數(shù)進(jìn)行改進(jìn),以提高選粉機(jī)的分級(jí)性能;采用兩次分級(jí)的方法來(lái)制備窄粒徑產(chǎn)品,并研究了工藝參數(shù)對(duì)產(chǎn)品粒徑分布的影響。由氣相特性顯示選粉機(jī)的流場(chǎng)存在的不足:工藝參數(shù)不匹配時(shí),葉片間存在旋渦;轉(zhuǎn)速變動(dòng),葉片間回流加劇;下錐體速度分布較低,選粉機(jī)再次分級(jí)能力較弱;蝸殼內(nèi)部湍流較強(qiáng)和轉(zhuǎn)籠高度不合理,能量損失嚴(yán)重。對(duì)選粉機(jī)的結(jié)構(gòu)參數(shù)和工藝參數(shù)進(jìn)行優(yōu)化,以改善其分級(jí)性能。工藝參數(shù)方面,對(duì)選粉機(jī)的轉(zhuǎn)速和風(fēng)速進(jìn)行合理匹配。結(jié)構(gòu)參數(shù)方面,對(duì)葉片結(jié)構(gòu)、下錐體、蝸殼、轉(zhuǎn)籠高度進(jìn)行優(yōu)化改進(jìn)。相對(duì)改進(jìn)前,改進(jìn)后選粉機(jī)的流場(chǎng)更加穩(wěn)定均勻,模擬分級(jí)效率曲線與理論分級(jí)曲線更加接近。在兩次分級(jí)的基礎(chǔ)上制備窄粒徑產(chǎn)品,可以通過(guò)調(diào)節(jié)兩臺(tái)選粉機(jī)的轉(zhuǎn)速來(lái)實(shí)現(xiàn)。同時(shí)增大或者減小兩臺(tái)選粉機(jī)的轉(zhuǎn)速,窄粒徑產(chǎn)品可以在保持較窄粒徑分布范圍的條件下,平均粒徑增大或者減小。在風(fēng)速不變時(shí),窄粒徑產(chǎn)品粒徑的分布由一、二次選粉機(jī)的轉(zhuǎn)速差決定。隨著轉(zhuǎn)速差的減小,粒徑分布曲線變窄。二次風(fēng)速對(duì)改善窄粒徑產(chǎn)品的粒徑分布具有重要意義。隨著二次風(fēng)速的增大,重質(zhì)碳酸鈣和水泥生料對(duì)應(yīng)的產(chǎn)品的粒度分布曲線都變窄,水泥生料的粒度分布曲線比重質(zhì)碳酸鈣的更窄。
[Abstract]:Narrow size products have been widely used because of their special properties. In order to meet the wide demand for narrow size products, it is particularly important to solve the problem of the preparation of narrow size products. The key points of preparing narrow particle size products by using separator are: classifying performance and preparation technology of the separator. On the basis of the numerical simulation study on the classification characteristics of the separator, the parameters of the separator are improved in order to improve the classification performance of the separator, and the narrow particle size products are prepared by the method of twice classification. The effect of process parameters on particle size distribution was studied. The gas phase characteristics show that there are shortcomings in the flow field of the separator: the vortex exists between the blades when the technological parameters are not matched, the speed changes, the reflux between the blades intensifies, the velocity distribution of the lower cone is lower, and the classifier is weak again. The turbulence in the volute is strong, the height of the cage is unreasonable, and the energy loss is serious. The structural and technological parameters of the separator were optimized to improve its classification performance. In terms of process parameters, the speed and wind speed of the separator are reasonably matched. In terms of structural parameters, the blade structure, lower cone, volute and cage height are optimized and improved. Before the improvement, the flow field of the improved separator is more stable and uniform, and the simulated classification efficiency curve is closer to the theoretical classification curve. The narrow particle size product can be prepared by adjusting the speed of the two separators on the basis of two grades. At the same time, by increasing or decreasing the rotating speed of the two separators, the average particle size of the products with narrow particle size can increase or decrease under the condition of keeping a narrow particle size distribution range. When the wind speed is constant, the particle size distribution of narrow particle size products is determined by the speed difference of primary and secondary separators. With the decrease of rotational speed difference, the distribution curve of particle size becomes narrower. The secondary wind speed plays an important role in improving the particle size distribution of narrow-diameter products. With the increase of the secondary wind speed, the particle size distribution curves of heavy calcium carbonate and cement raw meal become narrower, and the particle size distribution curve of cement raw meal is narrower than that of calcium carbonate.
【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】：2015
【分類號(hào)】：TQ051.8

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本文編號(hào)：1875707