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  本文選題：旋轉(zhuǎn)密封閥　切入點：硬密封　出處：《鋼鐵研究總院》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：多晶硅是現(xiàn)代光伏產(chǎn)業(yè)和電子產(chǎn)業(yè)的重要原料,近年來國際上都將清潔能源產(chǎn)業(yè)作為首要發(fā)展產(chǎn)業(yè),國內(nèi)也大力推動多晶硅產(chǎn)業(yè)的發(fā)展。三氯氫硅的合成是多晶硅生產(chǎn)過層中的重要環(huán)節(jié),旋轉(zhuǎn)給料閥是三氯氫硅合成系統(tǒng)中的一個關(guān)鍵設(shè)備,被用來定量添加硅粉到合成爐中,其工況介質(zhì)包括超細(xì)硅粉、氫氣、氯化氫、三氯氫硅等,面臨硅粉磨損、氫氯腐蝕等情況,極易造成物料外漏和氣體反串,給生產(chǎn)安全帶來很大的隱患。目前的旋轉(zhuǎn)給料閥還不能適應(yīng)這一惡略工況。本文從旋轉(zhuǎn)給料閥的密封結(jié)構(gòu)設(shè)計,材料耐磨耐蝕等角度出發(fā),針對三氯氫硅合成系統(tǒng)工況,對硬密封旋轉(zhuǎn)給料閥做了較為深入的研究。主要內(nèi)容包括:(1)旋轉(zhuǎn)動密封的整體設(shè)計研究:提出了V型填料、卸料孔與吹掃裝置相結(jié)合的復(fù)合動密封結(jié)構(gòu),能有效的防止硅粉進(jìn)入軸承間隙,降低設(shè)備損耗,并有效防止硅粉外漏;閥體內(nèi)表面采用了復(fù)合結(jié)構(gòu)設(shè)計,增加了超低碳鋼抗氫脆層,超音速火箭噴涂WC-17%Co硬質(zhì)合金耐磨層,然后表面進(jìn)行研磨,確保其涂層表面的致密性與耐磨性;采用弧形整體硬質(zhì)合金作為密封面,通過升降式閥座系統(tǒng),有效的解決了較小空間的弧形硬密封的問題;在旋轉(zhuǎn)閥內(nèi)部增加的報警裝置,能夠及時反映閥門的工作狀況。(2)硬密封材料性能的研究:通過巴西劈裂試驗測量了硬質(zhì)合金的抗拉強(qiáng)度為114.5MPa�；谡鎸嵉挠操|(zhì)合金金相圖片,通過圖像處理及閾值分割處理,建立了與金相圖片一致的有限元模型。對有限元模型進(jìn)行了拉伸模擬試驗,預(yù)測了硬質(zhì)合金的抗拉強(qiáng)度為132MPa,預(yù)測值與試驗值偏差較小。硬質(zhì)合金在裂紋擴(kuò)展過程中裂紋沿著不規(guī)則WC顆粒的邊界進(jìn)行,主要以橫向裂紋為主,縱向裂紋擴(kuò)展緩慢。
[Abstract]:Polysilicon is an important raw material in modern photovoltaic industry and electronic industry. In recent years, clean energy industry has been regarded as the most important industry in the world. The synthesis of trichlorosilicon is an important part of the overlayer of polysilicon production, and the rotary feed valve is a key equipment in the synthesis system of trichlorosilicon, which is used to add silicon powder to the synthesis furnace quantitatively. Its working conditions include ultrafine silicon powder, hydrogen, hydrogen chloride, trichlorosilane, etc. It is easy to cause material leakage and gas appearance due to silicon powder wear, hydrogen chloride corrosion and so on. At present, the rotary feed valve can not adapt to this kind of bad working condition. From the aspects of seal structure design of rotary feed valve and material wear resistance and corrosion resistance, this paper aims at the working condition of trichlorosilicon synthesis system. This paper makes a deep research on the hard seal rotary feed valve. The main contents include: the whole design of the rotary dynamic seal: the compound dynamic seal structure of V type packing, discharging hole and purging device is put forward. It can effectively prevent silicon powder from entering the bearing clearance, reduce equipment loss, and effectively prevent silicon powder leakage. The inner surface of valve body is designed with composite structure, which increases the resistance to hydrogen embrittlement of ultra-low carbon steel and the wear resistant layer of WC-17%Co cemented carbide sprayed by supersonic rocket. Then the surface is ground to ensure the compactness and wear resistance of the coating surface; the arc integral cemented carbide is used as the sealing surface and the arc hard sealing problem of smaller space is effectively solved through the lifting valve seat system. Study on the performance of hard Seal material: the tensile strength of cemented carbide measured by Brazilian splitting test is 114.5MPa. based on the real metallographic picture of cemented carbide, Through image processing and threshold segmentation, a finite element model consistent with the metallographic image is established, and the tensile simulation test of the finite element model is carried out. It is predicted that the tensile strength of cemented carbide is 132 MPA, and the deviation between the predicted value and the experimental value is small. During the crack propagation process, the crack of cemented carbide is carried out along the boundary of irregular WC particles, mainly transverse crack and slow longitudinal crack growth.
【學(xué)位授予單位】：鋼鐵研究總院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ127.2;TQ055.81

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