【摘要】：隨著塑料的大量使用,廢塑料薄膜的回收利用越來越受到關(guān)注。廢塑料薄膜回收利用的關(guān)鍵是分選方法的選擇,旋風(fēng)分選作為一種無污染、效率高的分選方法逐漸得到人們的重視。目前對(duì)廢塑料薄膜分選的研究還主要將塑料薄膜假設(shè)為顆粒進(jìn)行建模分析,而對(duì)廢塑料薄膜本身的變形研究相對(duì)較少。因此,本文主要對(duì)塑料薄膜本身的變形規(guī)律和分選關(guān)鍵技術(shù)進(jìn)行系統(tǒng)性研究,主要研究內(nèi)容如下:(1)提出了分析風(fēng)力分選廢塑料薄膜變形的虛擬質(zhì)點(diǎn)法,闡述了虛擬質(zhì)點(diǎn)法的描述方法,建立了質(zhì)點(diǎn)計(jì)算公式;分析得到了線單元的計(jì)算公式和外力轉(zhuǎn)換公式。運(yùn)用該方法建立了廢塑料薄膜的數(shù)學(xué)分析模型,求解得到了塑料薄膜變形與風(fēng)速之間的關(guān)系,為后續(xù)旋風(fēng)分離器的優(yōu)化設(shè)計(jì)提供了有效的研究方法。(2)使用ANSYS Workbench軟件建立了廢塑料薄膜在風(fēng)場(chǎng)中的分析模型,對(duì)廢塑料薄膜在不同風(fēng)力下的狀態(tài)進(jìn)行了雙向流固耦合分析,得到了廢塑料薄膜在多種風(fēng)力作用下的變形規(guī)律。對(duì)比仿真結(jié)果與虛擬質(zhì)點(diǎn)法的計(jì)算結(jié)果,驗(yàn)證了虛擬質(zhì)點(diǎn)法在求解分選薄膜變形方面的適用性,該方法具有計(jì)算量小、速度快的特點(diǎn)。(3)搭建了實(shí)驗(yàn)平臺(tái),設(shè)計(jì)了分選廢塑料薄膜變形實(shí)驗(yàn)方案,進(jìn)行了廢塑料薄膜在不同狀態(tài)下的風(fēng)力分選實(shí)驗(yàn);通過Matlab軟件擬合處理數(shù)據(jù)得到了風(fēng)速與位置坐標(biāo)的函數(shù)關(guān)系;使用高速攝像機(jī)記錄標(biāo)記薄膜的風(fēng)選圖像,研究了基于圖像測(cè)量變形量的方法,得到了虛擬質(zhì)點(diǎn)法理論值與實(shí)驗(yàn)值的誤差,為下一步旋風(fēng)分離器的仿真分析提供了理論指導(dǎo)。(4)根據(jù)虛擬質(zhì)點(diǎn)法、仿真和實(shí)驗(yàn)分析結(jié)論,對(duì)分選廢塑料薄膜的旋風(fēng)分離器進(jìn)行了優(yōu)化設(shè)計(jì)。使用Solidworks軟件建立了旋風(fēng)分離器的分析模型,使用Fluent流體分析軟件仿真分析了不同風(fēng)速時(shí)的旋風(fēng)分離器工作狀態(tài)。通過對(duì)仿真結(jié)果的分析研究,確定了旋風(fēng)分離器分選的最佳風(fēng)速,優(yōu)化了旋風(fēng)分離器結(jié)構(gòu)尺寸。
[Abstract]:With the extensive use of plastics, more and more attention has been paid to the recycling of waste plastic film. The selection of separation method is the key to recycling waste plastic film. As a kind of non-pollution and high efficiency separation method, cyclone separation has been paid more and more attention. At present, the research on the separation of waste plastic film mainly assumes that the plastic film is modeled as a particle, but the research on the deformation of the waste plastic film itself is relatively few. Therefore, this paper mainly studies the deformation law of plastic film itself and the key technology of sorting. The main research contents are as follows: (1) the virtual particle method is proposed to analyze the deformation of waste plastic film by wind separation. In this paper, the description method of virtual particle method is described, the formula of particle calculation is established, the calculation formula of line element and the formula of external force conversion are obtained by analysis. Using this method, the mathematical analysis model of waste plastic film is established, and the relationship between plastic film deformation and wind speed is obtained. It provides an effective research method for the optimization design of the cyclone separator. (2) the analysis model of waste plastic film in wind field is established by using ANSYS Workbench software, and the two-way fluid-solid coupling analysis of waste plastic film under different wind conditions is carried out. The deformation law of waste plastic film under various wind force is obtained. Comparing the simulation results with the results of the virtual particle method, the applicability of the virtual particle method in solving the deformation of the separation film is verified. The method has the characteristics of small calculation and fast speed. (3) an experimental platform is built. The experimental scheme of separating waste plastic film was designed, and the wind separation experiment of waste plastic film in different states was carried out, and the function relationship between wind speed and position coordinate was obtained by fitting and processing the data by Matlab software. The method of measuring deformation based on high speed video camera is studied, and the error between the theoretical and experimental values of virtual particle method is obtained. It provides theoretical guidance for further simulation analysis of cyclone separator. (4) according to the conclusion of virtual particle method, simulation and experimental analysis, the cyclone separator for separating waste plastic film is optimized. The analysis model of cyclone separator is established by Solidworks software, and the working state of cyclone separator with different wind speed is simulated by fluent fluid analysis software. Through the analysis and study of the simulation results, the optimum wind speed of cyclone separator sorting is determined, and the structure size of cyclone separator is optimized.
【學(xué)位授予單位】：山東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X705

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