【摘要】：廢棄催化劑中含有大量貴金屬組分,所以回收廢棄催化劑,意義深遠(yuǎn)。采用傾斜脈動(dòng)氣流分選床來(lái)分選廢棄催化劑,可以得到較好的分選效果。研究了傾斜脈動(dòng)氣流分選床的分離機(jī)理,推導(dǎo)了顆粒在主動(dòng)脈動(dòng)氣流中運(yùn)動(dòng)的動(dòng)力學(xué)方程。利用Fluent和EDEM軟件進(jìn)行數(shù)值模擬研究,得到了傾斜脈動(dòng)氣流分選床內(nèi)部流體的壓強(qiáng)、速度分布情況以及兩種不同性質(zhì)的顆粒群在流場(chǎng)中的運(yùn)動(dòng)與分離情況,并分析了兩種顆粒速度、位移以及受力隨時(shí)間的變化情況;利用高速動(dòng)態(tài)分析測(cè)試系統(tǒng)記錄了兩種顆粒的運(yùn)動(dòng)軌跡和分選過(guò)程,得到了實(shí)際試驗(yàn)中顆粒運(yùn)動(dòng)的位移和速度隨時(shí)間變化的曲線。利用傾斜脈動(dòng)氣流分選床分選廢棄催化劑,分別研究脈動(dòng)頻率、氣流速度和傾斜角度對(duì)分選效率的影響,試驗(yàn)結(jié)果表明:在固定氣流速度和傾斜角度的情況下,分選效率隨脈動(dòng)頻率的增加先增大后減小,在脈動(dòng)頻率為4.5Hz時(shí),可以獲得最高的分選效率99.55%;在固定脈動(dòng)頻率和傾斜角度的情況下,分選效率隨氣流速度的增加先增大后減小,在氣流速度為7.94m/s時(shí),可以獲得最高的分選效率99.84%;在固定脈動(dòng)頻率和氣流速度的情況下,分選效率隨傾斜角度的增加先增大后減小,在傾斜角度為40°時(shí),可以獲得最高的分選效率99.51%;利用Design-Expert正交設(shè)計(jì)軟件設(shè)計(jì)三因素三水平的正交試驗(yàn),結(jié)果表明:在脈動(dòng)頻率為4.5Hz、氣流速度為7.94m/s、傾斜角度為40°的因素組合下的最高分選效率99.51%,得到了單因素對(duì)分選效率的影響顯著性依次為:氣流速度、傾斜角度、脈動(dòng)頻率,還得到了用實(shí)際因素值表示分選效率的表達(dá)式。
[Abstract]:The waste catalyst contains a large number of precious metal components, so it is of great significance to recycle the waste catalyst. The better separation effect can be obtained by using the tilting pulsating flow separator to separate the waste catalyst. The separation mechanism of tilted pulsating flow separation bed was studied and the kinetic equation of particle movement in aortic dynamic flow was derived. By using Fluent and EDEM software, the pressure, velocity distribution and the movement and separation of two different particle groups in the flow field are obtained. The changes of particle velocity, displacement and force with time are analyzed. The moving track and sorting process of the two kinds of particles were recorded by using the high-speed dynamic analysis and testing system. The curves of the displacement and velocity of the particle movement with time in the actual test were obtained. The effects of pulsating frequency, velocity and angle on separation efficiency were studied by using tilted pulsating flow separation bed to separate the waste catalyst. The experimental results show that: under the condition of fixed flow velocity and inclined angle, The separation efficiency increases first and then decreases with the increase of pulsating frequency. When the pulsating frequency is 4.5Hz, the highest separation efficiency can be obtained 99.55. Under the condition of fixed pulsating frequency and inclined angle, the separation efficiency increases first and then decreases with the increase of the flow velocity. When the flow velocity is 7.94m/s, the highest separation efficiency can be obtained 99.84. Under the condition of constant pulsating frequency and airflow velocity, the separation efficiency increases first and then decreases with the increase of the inclined angle. The highest separation efficiency can be obtained when the angle is 40 擄. The orthogonal experiment with three factors and three levels is designed by using Design-Expert orthogonal design software. The results show that the maximum separation efficiency is 99.51 when the pulsation frequency is 4.5 Hz, the velocity of air flow is 7.94 m / s, and the angle of inclination is 40 擄. The effects of single factor on the separation efficiency are obtained in order of flow velocity, inclination angle, pulsation frequency, and the expression of the separation efficiency expressed by the actual factor value is obtained.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X705;TQ028

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本文編號(hào)：2305024