本文關(guān)鍵詞： 碳納米管 化學(xué)氣相沉積爐 溫度場(chǎng) 流場(chǎng) 數(shù)值模擬　出處：《南昌大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：碳納米管由于其獨(dú)特的結(jié)構(gòu)而具有優(yōu)越的機(jī)械、電學(xué)和熱學(xué)等性能,在復(fù)合材料、催化劑載體、鋰離子電池、場(chǎng)發(fā)射材料和隱形材料等領(lǐng)域表現(xiàn)出很好的應(yīng)用前景。目前生產(chǎn)碳納米管的主要方式為化學(xué)氣相沉積法,但該法生產(chǎn)的碳納米管存在石墨化程度不高,曲率大,相互纏繞不易分散等缺陷。所以基于化學(xué)氣相沉積法,開發(fā)研究制備優(yōu)質(zhì)碳納米管的工藝和裝備是當(dāng)前研究的熱點(diǎn)。本課題組基于化學(xué)氣相沉積法,研制設(shè)計(jì)生產(chǎn)優(yōu)質(zhì)碳納米管的化學(xué)氣相沉積爐。深入了解生產(chǎn)碳納米管時(shí)沉積爐內(nèi)的溫度場(chǎng)和流場(chǎng)分布情況,對(duì)于指導(dǎo)碳納米管的合成工藝研究具有重要意義。分析旋風(fēng)分離器中的流場(chǎng)分布情況和其分離效果,對(duì)于裝置結(jié)構(gòu)的設(shè)計(jì)和改進(jìn)具有重要的實(shí)踐意義。本文首先對(duì)沉積爐的結(jié)構(gòu)進(jìn)行了設(shè)計(jì),然后根據(jù)化學(xué)氣相沉積爐的幾何尺寸,建立了沉積爐傳熱的二維和三維計(jì)算模型,基于FLUENT平臺(tái),對(duì)化學(xué)氣相沉積爐合成碳納米管的過(guò)程進(jìn)行了非穩(wěn)態(tài)數(shù)值模擬,得到了爐膛內(nèi)的溫度場(chǎng)及流場(chǎng)分布情況,并與實(shí)驗(yàn)結(jié)果進(jìn)行了對(duì)比分析。最后,以旋風(fēng)分離器為研究對(duì)象,建立了分離器的三維計(jì)算模型,運(yùn)用FLUENT軟件,對(duì)分離器的分離過(guò)程進(jìn)行了數(shù)值模擬,得到了分離器中的流場(chǎng)分布情況和碳納米管的運(yùn)動(dòng)軌跡。模擬結(jié)果顯示,沉積爐內(nèi)二維和三維結(jié)果基本一致。氣流主要影響爐膛一區(qū)和二區(qū)的中心區(qū)域,但對(duì)三區(qū)和四區(qū)的影響較小。爐膛內(nèi)的溫度場(chǎng)并不是均勻分布的,沿軸向方向上溫度呈上高下低的趨勢(shì)(中心區(qū)域除外);沿徑向上爐膛內(nèi)溫度在一區(qū)有較大的變化,而在二三四區(qū)基本維持相對(duì)穩(wěn)定的溫度。發(fā)熱體處的模擬溫度和實(shí)測(cè)溫度之間的最大誤差率在誤差允許范圍內(nèi),說(shuō)明模型比較可靠,模擬結(jié)果有一定的參考價(jià)值。分離器中氣體相的流動(dòng)主要是雙層旋流,向下旋轉(zhuǎn)運(yùn)動(dòng)的外旋流和向上旋轉(zhuǎn)的內(nèi)旋流,兩者旋向相同。顆粒物的粒徑和入口位置對(duì)顆粒相在旋風(fēng)分離器中的運(yùn)動(dòng)軌跡影響很大。旋風(fēng)分離器的結(jié)構(gòu)和流體參數(shù)對(duì)分離器的分離效率影響較大。
[Abstract]:Carbon nanotubes have superior mechanical because of its unique structure, electrical and thermal properties in composite materials, catalyst carrier, lithium ion battery, field emission materials and stealth materials show good prospects. The main way for the production of carbon nanotubes by chemical vapor deposition method, but the method of production the graphitization degree of carbon nanotubes are not high, large curvature, mutual winding can not be dispersed and other defects. So based on the chemical vapor deposition method, the research and development of preparation technology and equipment of high quality carbon nanotubes is the focus of current research. This topic is based on the chemical vapor deposition, chemical gas development and production of high quality carbon nanotubes the design of phase deposition furnace. An in-depth understanding of production of carbon nanotubes deposited in the furnace temperature field and flow field distribution, which is very important to study the synthesis process of direct carbon nanotubes. Analysis of cyclone separator The flow field distribution and effect of its isolation, the design and the device structure has important practical significance. Firstly the structure of deposition furnace is designed, and then according to the geometry of a chemical vapor deposition furnace, a two-dimensional and three-dimensional deposition furnace heat transfer calculation model based on the FLUENT platform, the simulation steady state numerical process of chemical vapor deposition furnace synthesis of carbon nanotubes, the temperature field and flow field distribution inside the furnace, and compared with the experimental results. Finally, the research object in the cyclone, established a three-dimensional calculation model of the separator, the use of FLUENT software, the numerical simulation of the separation process the separator, the trajectory of the flow field distribution and carbon nanotubes in the separator. The simulation results show that the deposition furnace 2D and 3D flow of main results are basically the same. To influence regional center for the region and the two region, but has little effect on the three and four areas. The temperature field in the furnace is not evenly distributed along the axial direction, the temperature in the low end of the trend (central region except); along the radial direction on the furnace temperature in the region have great changes but, in the 234 District remained relatively stable temperature. The maximum error between the simulation temperature and heating rate of the measured temperature in the range of allowable error, the model is reliable, the simulation results have a certain reference value. The main flow in gas phase separator if double vortex, rotating downward swirl and to on the rotating flow, the same rotation direction. The particle size and the entrance position on the particle trajectory in the cyclone separator is greatly affected. The efficiency of the separator structure and fluid parameters of cyclone separator It has great influence.

【學(xué)位授予單位】：南昌大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ127.11;TB383.1

【共引文獻(xiàn)】

相關(guān)期刊論文 前1條

1 余風(fēng)利;楊湘杰;劉旭波;吳保亮;;晶須狀碳納米管沉積爐的數(shù)值模擬及實(shí)驗(yàn)研究[J];化工新型材料;2015年07期

相關(guān)碩士學(xué)位論文 前1條

1 譚曉琳;有機(jī)碳納米管薄膜的制備及應(yīng)用的研究[D];北京交通大學(xué);2014年

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本文編號(hào)：1555436