本文選題：復(fù)合式干選機(jī) + 廢催化劑�。� 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：石油重整廢鈀催化劑中含有較多貴金屬鈀,其品位比一般鉑鈀礦石中鈀的品位高得多,從廢催化劑中回收鈀金屬成本,不僅可以提高經(jīng)濟(jì)效益,還可以減小環(huán)境污染。復(fù)合式干選機(jī)具有不用水、無污染、處理量大、分選效率高等眾多優(yōu)點(diǎn),這為廢催化劑的預(yù)處理提供了一種新途徑。根據(jù)前期探索試驗(yàn)、數(shù)值模擬結(jié)果以及物料性質(zhì),對復(fù)合式干選機(jī)的床面進(jìn)行了優(yōu)化,制造了開孔直徑2mm,格條安裝角度50°的新床面,并對廢鈀催化劑進(jìn)行分選試驗(yàn),試驗(yàn)結(jié)果顯示,廢催化劑中的棒狀物料和球形物料可以有效分離,分選效率較高。在探索試驗(yàn)基礎(chǔ)上,分析了分選床面上廢催化劑顆粒的受力和運(yùn)動行為,推導(dǎo)了沿X軸(水平面上與背板平行)方向上,顆粒向棒狀物料出口運(yùn)動的速度表達(dá)式。建立了遠(yuǎn)離背板區(qū)域內(nèi)棒狀顆粒和球形顆粒沿Z軸(水平面上與X軸垂直)方向的運(yùn)動微分方程,以及背板區(qū)域內(nèi)底層顆粒和表層顆粒沿Z軸方向的運(yùn)動微分方程。利用DEM-CFD耦合的方法,模擬廢催化劑顆粒的運(yùn)動行為和分離規(guī)律。探究了分選床面上流場速度和壓強(qiáng)的分布,結(jié)果表明,在分選穩(wěn)定后,床面上形成了穩(wěn)定的有利于物料松散的局部高速度區(qū)域和局部低速度區(qū)域。分析了不同性質(zhì)的顆粒在分選床面上的運(yùn)動分離規(guī)律,得到了不同形狀和密度組合下,兩種顆粒的速度和位移隨時間的變化規(guī)律。其結(jié)果表明,不同形狀的兩種顆粒之間在不同的密度組合下都產(chǎn)生了明顯的位移差,可以實(shí)現(xiàn)有效分離,密度對顆粒的運(yùn)動產(chǎn)生了一定的影響;在相同形狀下不同密度的兩種顆粒之間的位移差很小,無法實(shí)現(xiàn)分離。進(jìn)行了復(fù)合式干選機(jī)分選試驗(yàn)研究,探究了振幅、振動頻率、氣速和床面橫向傾角對分選效率的影響。運(yùn)用正交試驗(yàn)對各因素的協(xié)調(diào)作用進(jìn)行分析,試驗(yàn)結(jié)果表明:在振幅3.25mm、振動頻率35Hz、氣速1m/s、橫向傾角5°的操作參數(shù)組合下,得到最高的分選效率為99.32%。建立了分選效率與各影響因素之間數(shù)學(xué)關(guān)系模型的表達(dá)式,得出了各因素對分選效率的影響顯著程度:振動頻率D橫向傾角C振幅A氣速。
[Abstract]:There are more noble metal palladium in the waste palladium catalyst for petroleum reforming, and its grade is much higher than that in the ordinary platinum palladium ore. The cost of recovering palladium metal from the waste catalyst can not only increase the economic benefit but also reduce the environmental pollution. Compound dry separator has many advantages, such as no water, no pollution, large amount of treatment, high separation efficiency and so on, which provides a new way for pretreatment of waste catalyst. According to the preliminary exploration test, numerical simulation results and material properties, the bed surface of the composite dry separator was optimized. A new bed surface with opening diameter of 2 mm and an angle of 50 擄was fabricated, and the waste palladium catalyst was separated. The experimental results show that the rod and spherical materials in the waste catalyst can be separated effectively and the separation efficiency is high. On the basis of the experimental results, the force and motion behavior of the waste catalyst particles on the separation bed surface are analyzed. The velocity expression of the particles moving towards the outlet of the rod material along the X axis (parallel to the back plate on the horizontal plane) is derived. The differential equations of motion of rod-like particles and spherical particles along Z axis (vertical to X axis in horizontal plane) and the motion differential equations of bottom particles and surface particles in backplate region along Z axis are established. The movement behavior and separation law of waste catalyst particles were simulated by DEM-CFD coupling method. The distribution of flow field velocity and pressure on the separation bed surface is investigated. The results show that stable local high velocity region and local low velocity region are formed on the bed surface after separation stability. In this paper, the moving and separating laws of particles with different properties on the separation bed surface are analyzed, and the variation of velocity and displacement of the two particles with time under different shapes and densities are obtained. The results show that there are obvious displacements between two kinds of particles in different density combinations, which can be separated effectively, and the density has a certain effect on the movement of particles. Under the same shape, the displacement difference between two kinds of particles with different densities is very small and can not be separated. The effects of amplitude, vibration frequency, gas velocity and lateral inclination of bed surface on separation efficiency were investigated. The coordination effect of various factors is analyzed by orthogonal test. The results show that the highest separation efficiency is 99.32mm under the operating parameters of amplitude 3.25mm, vibration frequency 35Hz, gas velocity 1m / s, transverse inclination 5 擄. The mathematical model of the relationship between the separation efficiency and the influencing factors is established, and the remarkable degree of influence of each factor on the separation efficiency is obtained: the vibration frequency D transverse dip angle C amplitude A gas velocity.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD953

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本文編號：2110069