旋转密封阀的设计研究

发布时间：2018-03-19 23:36

本文选题：旋转密封阀　切入点：硬密封　出处：《钢铁研究总院》2017年硕士论文　论文类型：学位论文

【摘要】：多晶硅是现代光伏产业和电子产业的重要原料,近年来国际上都将清洁能源产业作为首要发展产业,国内也大力推动多晶硅产业的发展。三氯氢硅的合成是多晶硅生产过层中的重要环节,旋转给料阀是三氯氢硅合成系统中的一个关键设备,被用来定量添加硅粉到合成炉中,其工况介质包括超细硅粉、氢气、氯化氢、三氯氢硅等,面临硅粉磨损、氢氯腐蚀等情况,极易造成物料外漏和气体反串,给生产安全带来很大的隐患。目前的旋转给料阀还不能适应这一恶略工况。本文从旋转给料阀的密封结构设计,材料耐磨耐蚀等角度出发,针对三氯氢硅合成系统工况,对硬密封旋转给料阀做了较为深入的研究。主要内容包括:(1)旋转动密封的整体设计研究:提出了V型填料、卸料孔与吹扫装置相结合的复合动密封结构,能有效的防止硅粉进入轴承间隙,降低设备损耗,并有效防止硅粉外漏;阀体内表面采用了复合结构设计,增加了超低碳钢抗氢脆层,超音速火箭喷涂WC-17%Co硬质合金耐磨层,然后表面进行研磨,确保其涂层表面的致密性与耐磨性;采用弧形整体硬质合金作为密封面,通过升降式阀座系统,有效的解决了较小空间的弧形硬密封的问题;在旋转阀内部增加的报警装置,能够及时反映阀门的工作状况。(2)硬密封材料性能的研究:通过巴西劈裂试验测量了硬质合金的抗拉强度为114.5MPa。基于真实的硬质合金金相图片,通过图像处理及阈值分割处理,建立了与金相图片一致的有限元模型。对有限元模型进行了拉伸模拟试验,预测了硬质合金的抗拉强度为132MPa,预测值与试验值偏差较小。硬质合金在裂纹扩展过程中裂纹沿着不规则WC颗粒的边界进行,主要以横向裂纹为主,纵向裂纹扩展缓慢。
[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.
【学位授予单位】：钢铁研究总院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ127.2;TQ055.81

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