本文選題：廢棄催化劑 + 脈動(dòng)能量　； 參考：《中國(guó)礦業(yè)大學(xué)》2017年碩士論文

【摘要】：廢棄催化劑中含有貴金屬組分,回收廢棄催化劑對(duì)資源的回收利用和環(huán)境保護(hù)具有重要的意義。本文以廢棄催化劑為研究對(duì)象,研究了廢棄催化劑的宏觀密度組成,借助BT-2900動(dòng)態(tài)圖像分析儀得到物料的粒度組成。借助X射線衍射和X射線熒光光譜分析技術(shù)得到物料的成分及含量和元素組成,表明了物料含有貴金屬Pt,含量達(dá)到0.156%,具有分選價(jià)值。根據(jù)廢棄催化劑的密度差異,設(shè)計(jì)了脈動(dòng)能量強(qiáng)化振動(dòng)分選床系統(tǒng)。研究了物料在脈動(dòng)能量強(qiáng)化下振動(dòng)分選床中的受力平衡及動(dòng)力學(xué)分析,揭示了物料在床體中的分離機(jī)理。采用CFD-DEM耦合技術(shù),首先研究了脈動(dòng)氣流下顆粒的分離情況,表明了顆粒在傾斜分選床中僅受脈動(dòng)氣流的作用會(huì)存在堆積現(xiàn)象。模擬了不同密度球形顆粒的分離情況,表明了顆粒在分選床中主要基于密度進(jìn)行分離。研究了振動(dòng)和脈動(dòng)氣流復(fù)合力場(chǎng)下分選床中顆粒的運(yùn)動(dòng)情況和床體內(nèi)部的流場(chǎng)變化。通過(guò)分析顆粒的運(yùn)動(dòng)情況,獲得不同密度顆粒的速度、位移、和受力隨時(shí)間的變化規(guī)律,表明了在氣流和振動(dòng)的協(xié)同作用下,不同密度顆粒能夠有效分離。利用高速動(dòng)態(tài)分析測(cè)試系統(tǒng)觀察物料分別在脈動(dòng)氣流及其與振動(dòng)作用下的分離情況,表明了試驗(yàn)現(xiàn)象和模擬結(jié)果相符。利用脈動(dòng)能量強(qiáng)化振動(dòng)分選床分選系統(tǒng)對(duì)廢棄催化劑進(jìn)行試驗(yàn)研究�？疾炝藲饬魉俣�、脈動(dòng)頻率、傾斜角度和振動(dòng)強(qiáng)度對(duì)廢棄催化劑分選效率的影響,試驗(yàn)結(jié)果表明:廢棄催化劑的綜合效率隨著氣速、脈動(dòng)頻率、傾斜角度和振動(dòng)強(qiáng)度的不斷增加,呈現(xiàn)先增加后減小的趨勢(shì)。在單因素試驗(yàn)的基礎(chǔ)上,運(yùn)用Design-Expert軟件設(shè)計(jì)響應(yīng)曲面試驗(yàn),研究表明:氣速為7.71m/s、脈動(dòng)頻率為3.8Hz、振動(dòng)強(qiáng)度為10、傾斜角度為30鐜時(shí),分選廢棄催化劑的綜合效率為97.36%。通過(guò)上述研究發(fā)現(xiàn),新型脈動(dòng)能量強(qiáng)化振動(dòng)分選床較普通脈動(dòng)氣流分選床,不僅處理量增大,且分選物料易收集,可連續(xù)給料,具有重要的應(yīng)用價(jià)值。
[Abstract]:The waste catalyst contains precious metal components, so the recovery of waste catalyst is of great significance to the recovery and utilization of resources and environmental protection. In this paper, the macroscopic density composition of the waste catalyst was studied, and the particle size composition of the waste catalyst was obtained by BT-2900 dynamic image analyzer. By means of X-ray diffraction and X-ray fluorescence spectroscopy, the composition, content and elemental composition of the material are obtained. It is shown that the material contains precious metal, the content of which is 0.156, which has the value of sorting. According to the density difference of the waste catalyst, the vibratory separation bed system with pulsating energy was designed. The mechanical balance and dynamic analysis of materials in vibratory separation bed under pulsating energy strengthening are studied. The separation mechanism of materials in bed is revealed. By using CFD-DEM coupling technique, the separation of particles in pulsating air flow is studied, which shows that there is a stacking phenomenon of particles in inclined separation bed only affected by pulsating airflow. The separation of spherical particles with different densities is simulated, which shows that the separation of particles in the separation bed is mainly based on density. The movement of particles in the separation bed and the variation of the flow field in the bed body under the combined force field of vibration and pulsating flow are studied. By analyzing the movement of particles, the changes of velocity, displacement and force with time of particles with different densities are obtained. It is shown that the particles with different densities can be separated effectively under the synergistic action of air flow and vibration. The high speed dynamic analysis and measurement system is used to observe the separation of materials under pulsating air flow and vibration respectively, which shows that the experimental phenomenon is in agreement with the simulation results. An experimental study on the waste catalyst was carried out by using pulsating energy enhanced vibratory separation bed separation system. The effects of flow velocity, pulsation frequency, tilt angle and vibration intensity on the separation efficiency of the waste catalyst were investigated. The experimental results showed that the comprehensive efficiency of the waste catalyst varied with the gas velocity and the pulsating frequency. The inclination angle and vibration intensity increase firstly and then decrease. On the basis of single factor test, the response surface test was designed by using Design-Expert software. The results show that when the gas velocity is 7.71 m / s, the pulsation frequency is 3.8 Hz, the vibration intensity is 10, and the inclination angle is 30 擄, the comprehensive efficiency of the waste catalyst is 97.36%. It is found that the new type pulsating energy enhanced vibratory separation bed is of great value in application because it not only increases the handling capacity, but also can be collected easily and can be continuously fed with the new type of pulsating energy enhanced vibratory separation bed compared with the ordinary pulsating flow separator.
【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】：2017
【分類號(hào)】：X705;TD953

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