【摘要】：能源是人們賴以生存的重要資源,但隨著科技的進步和社會的發(fā)展,石油、煤炭等不可再生資源日益減少,這使得一些可再生能源慢慢進入了人們的視野。其中受到廣泛關(guān)注的一種便是太陽能,而多晶硅做為太陽能光伏行業(yè)的基本原料在國內(nèi)卻主要依靠進口。隨著經(jīng)濟的發(fā)展,國內(nèi)多晶硅行業(yè)目前正面臨著產(chǎn)業(yè)升級的關(guān)鍵時期,企業(yè)對高純多晶硅的需求更加強烈,同時對于所用到的石墨部件的純度也要求的更加苛刻。雖在國外已擁有較成熟的完整制備工藝和生產(chǎn)設(shè)備,但國內(nèi)還是起步階段,并且受到了國外相關(guān)技術(shù)的封鎖,所以到目前為止對于生產(chǎn)超高純度石墨的碳凈化設(shè)備還沒有可行、有效解決的辦法。碳凈化爐設(shè)備就是消除石墨部件雜質(zhì),凈化石墨的設(shè)備,對于原有的碳凈化爐設(shè)備針對其發(fā)生的問題,進一步的研究、優(yōu)化、設(shè)計,制造出符合工藝生產(chǎn)需要的設(shè)備。本文對原有的碳凈化爐設(shè)備的腐蝕成分進行分析(利用SEM、EDS、XRD技術(shù)),最終得出設(shè)備內(nèi)的附著物包括:六水氯化鉻(CrCl_2·6H_2O)、六水氯化鐵(FeCl_3·6H_2O)、四水氯化亞鐵(FeCl_2·4H_2O)、四水氯化鎳(NiCl_2·4H_2O)、鎂鐵礦(鐵酸鎂尖晶石構(gòu)造復(fù)合氧化物,MgFe_2O_4)和二水氯化鎳(NiCl_2·2H_2O)等晶體。根據(jù)所得的附著物,確定設(shè)備發(fā)生腐蝕的機理,高溫環(huán)境下氯氣會與設(shè)備發(fā)生化學(xué)反應(yīng),在不同的溫度環(huán)境下產(chǎn)生的生成物不同,并且它們的物性粘稠,造成原設(shè)計中管路被堵,影響設(shè)備的正常運行。結(jié)合其他行業(yè)的方法措施進行設(shè)備的選材確定,而由于設(shè)備傳熱會直接影響到設(shè)備的選型、選材以及結(jié)構(gòu)設(shè)計,所以把設(shè)備在工藝過程中可能的理論計算值以及利用Fluent有限元軟件的模擬計算、實測值,進行對比研究分析,為設(shè)備的選型、選材以及結(jié)構(gòu)設(shè)計提供理論基礎(chǔ)。完成設(shè)備結(jié)構(gòu)的優(yōu)化,使得新設(shè)備能夠進一步提高產(chǎn)品的質(zhì)量,滿足生產(chǎn)需要。
[Abstract]:Energy is an important resource on which people depend for survival, but with the progress of science and technology and the development of society, the non-renewable resources such as oil, coal and so on are decreasing day by day, which makes some renewable energy come into people's field of vision. One of them is solar energy, and polysilicon, as the basic raw material of solar photovoltaic industry, is mainly imported in China. With the development of economy, the domestic polysilicon industry is facing the critical period of industrial upgrading, the demand for high-purity polysilicon is more intense, and the purity of graphite components used is also more demanding. Although it has a mature and complete preparation process and production equipment abroad, it is still in its initial stage at home and blocked by the relevant foreign technologies, so far, the carbon purification equipment for producing ultra-high purity graphite has not been feasible. An effective solution. The equipment of carbon purification furnace is to eliminate the impurity of graphite parts and purify graphite. In view of the problems existing in the equipment of carbon purification furnace, further research, optimization, design and manufacture of equipment that meet the needs of process production are carried out. In this paper, the corrosion components of the original equipment for the carbon purification furnace were analyzed (using SEM,EDS,XRD technology). Finally, the attachments in the equipment were obtained as follows: chromium chloride hexahydrate (CrCl_ 2.6H _ 2O), ferric chloride hexahydrate (FeCl_ 3.6H _ 2O), and iron chloride hexahydrate (FeCl_ 3.6H _ 2O). Iron chloride tetrahydrate (FeCl_ 2.4H _ 2O), nickel chloride tetrahydrate (NiCl_ 2.4H _ 2O), magnetite (magnesia spinel complex oxide, MgFe_2O_4) and nickel chloride dihydrate (NiCl_ 2 路2H _ 2O) have been studied. According to the attachment obtained, the corrosion mechanism of the equipment is determined. Chlorine gas will react with the equipment in high temperature environment, the products produced in different temperature environment are different, and their physical properties are viscous. The pipeline is blocked in the original design, affecting the normal operation of the equipment. Combined with other industry methods and measures to determine the equipment material selection, and because the equipment heat transfer will directly affect the selection of equipment, material selection and structural design, In order to provide a theoretical basis for the selection of equipment, material selection and structural design, the possible theoretical calculation values of the equipment in the process of processing, the simulation calculation with Fluent finite element software and the measured values are compared and analyzed in order to provide a theoretical basis for the selection, material selection and structural design of the equipment. Complete the optimization of the equipment structure, so that the new equipment can further improve the quality of the product to meet the needs of production.
【學(xué)位授予單位】：青海大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB304

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