本文選題：超細(xì)粉體分級(jí) + 渦輪分級(jí)機(jī)��； 參考：《北京化工大學(xué)》2015年碩士論文

【摘要】：隨著超細(xì)粉體的廣泛應(yīng)用,對(duì)超細(xì)粉體的粒度和純度等方面都有了更高要求,也對(duì)超細(xì)粉體的粉碎和分級(jí)設(shè)備有了更高的要求。本文設(shè)計(jì)了—臺(tái)高速機(jī)械沖擊粉碎機(jī)對(duì)實(shí)驗(yàn)物料進(jìn)行粉碎,采用計(jì)算流體力學(xué)軟件(Fluent)模擬分級(jí)流場(chǎng)來(lái)研究渦輪分級(jí)機(jī)的操作參數(shù)和渦流空氣分級(jí)機(jī)的轉(zhuǎn)籠葉片數(shù)量對(duì)分級(jí)機(jī)流場(chǎng)的影響。開(kāi)展粉碎粉體的分級(jí)實(shí)驗(yàn),研究了操作參數(shù)對(duì)分級(jí)性能的影響。本論文主要研究及結(jié)果如下：1、利用沖擊粉碎原理設(shè)計(jì)了高速機(jī)械沖擊粉碎機(jī),通過(guò)兩個(gè)粉碎盤(pán)相向旋轉(zhuǎn)提高沖擊速度來(lái)改善粉碎效果,粉碎機(jī)內(nèi)部結(jié)構(gòu)都采用耐磨陶瓷內(nèi)襯來(lái)保證產(chǎn)物的純度。該粉碎機(jī)適用的粉碎物料粒度為2～3mm,粉碎后粒徑大約為50～150μm。2、對(duì)FTW-350型渦輪分級(jí)機(jī)的內(nèi)部氣流和物料的流動(dòng)狀態(tài)采用氣固兩相數(shù)值模擬進(jìn)行分析。渦輪分級(jí)機(jī)的操作參數(shù)分別以分級(jí)輪轉(zhuǎn)速、加料速度和出口壓力為變量,其余兩操作參數(shù)保持不變,對(duì)比分析流場(chǎng)的動(dòng)態(tài)壓力、湍動(dòng)能、切向速度、徑向速度和軸向速度的分布情況。結(jié)果表明：轉(zhuǎn)速在6000-7000r/min范圍內(nèi),分級(jí)輪轉(zhuǎn)速越大,流場(chǎng)中的動(dòng)態(tài)壓力、湍動(dòng)能和速度分布更加均勻,說(shuō)明流場(chǎng)比較穩(wěn)定：加料速度越大,分級(jí)區(qū)域和細(xì)粉出口的壓差越大、湍動(dòng)能和各個(gè)分速度也越小；出口壓力在較低范圍內(nèi)增加,動(dòng)態(tài)壓力、湍動(dòng)能和速度的增量較小,但出口壓力增加到-3500Pa后,流場(chǎng)的壓力和各個(gè)分速度都隨之急劇增加且分布不均勻,不利于流場(chǎng)的穩(wěn)定。3、將新粉碎機(jī)制備的高嶺土粉體在FTW-350型渦輪分級(jí)機(jī)上進(jìn)行分級(jí)實(shí)驗(yàn),通過(guò)激光粒度測(cè)試儀對(duì)分級(jí)產(chǎn)物進(jìn)行粒度測(cè)試分析,得到體積累積和頻度分布曲線。結(jié)果表明：增加分級(jí)輪轉(zhuǎn)速有利于提高細(xì)粉含量并減小粒度分布范圍,但轉(zhuǎn)動(dòng)頻率增加到75Hz后對(duì)分級(jí)粒度影響較小；加料速度在一定范圍內(nèi)增加可以提高細(xì)粉含量,在高轉(zhuǎn)速下的影響較小。4、針對(duì)渦流空氣分級(jí)機(jī)內(nèi)的單相氣流流場(chǎng)狀態(tài),對(duì)12、24、36、48、60和72六組轉(zhuǎn)籠葉片數(shù)量下流場(chǎng)的動(dòng)態(tài)壓力、切向速度和徑向速度進(jìn)行對(duì)比分析表明：葉片數(shù)量由12增加至48,分級(jí)流場(chǎng)的壓力和速度分布的均勻性不斷提高,且氣流渦旋不斷減小；葉片數(shù)量繼續(xù)增加,流場(chǎng)的均勻性降低：葉片數(shù)量為48時(shí),葉片間的氣流渦旋相對(duì)較小,流場(chǎng)的動(dòng)態(tài)壓力和速度分布都比其他葉片數(shù)量時(shí)均勻,即流場(chǎng)相對(duì)穩(wěn)定,達(dá)到最優(yōu)分級(jí)效果。
[Abstract]:With the wide application of ultrafine powder, there are higher requirements for particle size and purity of ultrafine powder, as well as higher requirements for crushing and classifying equipment of ultrafine powder. In this paper, a high-speed mechanical impact pulverizer is designed to crush the experimental materials. The influence of operating parameters of turbine classifier and the number of rotor blades of swirl air classifier on the flow field of turbine classifier was studied by using fluent software. The influence of operating parameters on the classification performance was studied. The main research and results of this paper are as follows: 1. Using the principle of impact comminution, a high-speed mechanical impact crusher is designed. The impact speed is improved by rotating two comminuted disks in opposite direction to improve the comminution effect. The internal structure of the mill is made of wear-resistant ceramic lining to ensure the purity of the product. The particle size of the comminuted material is 2 ~ 3 mm and the particle size is about 50 ~ 150 渭 m 路m ~ (-2). The gas flow and material flow state in FTW-350 turbine classifier are analyzed by gas-solid two-phase numerical simulation. The operating parameters of the turbine classifier are as follows: the speed of the stage wheel, the feeding speed and the outlet pressure, respectively, while the other two operating parameters remain unchanged. The dynamic pressure, turbulent kinetic energy and tangential velocity of the flow field are compared and analyzed. Distribution of radial velocity and axial velocity. The results show that in the range of 6000-7000r/min, the larger the speed of the classifier wheel, the more uniform the dynamic pressure, turbulent kinetic energy and velocity distribution in the flow field, which indicates that the flow field is more stable: the greater the feeding speed, the greater the pressure difference between the classifying region and the exit of fine powder. The smaller the turbulent kinetic energy and velocity, the lower the outlet pressure, the smaller the increment of dynamic pressure, turbulent kinetic energy and velocity, but when the outlet pressure increased to -3500Pa, the increase of dynamic pressure, turbulent kinetic energy and velocity was smaller, but when the outlet pressure increased to -3500Pa, The pressure and velocity of the flow field increase rapidly and the distribution is uneven, which is not conducive to the stability of the flow field. The kaolin powder prepared by the new pulverizer is tested on the FTW-350 turbine classifier. The volume accumulation and frequency distribution curves were obtained by analyzing the granularity of the classification products by laser particle size tester. The results show that increasing the rotating speed of the classifier wheel can increase the content of fine powder and decrease the particle size distribution, but the increase of rotation frequency to 75 Hz has little effect on the particle size, and the increase of feeding speed can increase the content of fine powder in a certain range. Under the condition of high rotating speed, the influence is small. 4. In view of the single phase flow field state in the eddy current air classifier, the dynamic pressure of the flow field under the number of 12 ~ (24) ~ (36) ~ (6) ~ (6) rotating cage vane and 72 groups of rotating cage blades is studied. The comparison and analysis of tangential velocity and radial velocity show that when the number of blades increases from 12 to 48, the uniformity of pressure and velocity distribution of the flow field increases continuously, and the vortex of air flow decreases, and the number of blades continues to increase. The uniformity of flow field is reduced: when the number of blades is 48, the vortex between blades is relatively small, and the dynamic pressure and velocity distribution of the flow field is more uniform than that of other blades, that is, the flow field is relatively stable, and the optimal classification effect is achieved.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TQ051.8

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