典型工况下碳净化设备腐蚀行为与结构优化研究

发布时间：2019-03-18 12:20

【摘要】：能源是人们赖以生存的重要资源,但随着科技的进步和社会的发展,石油、煤炭等不可再生资源日益减少,这使得一些可再生能源慢慢进入了人们的视野。其中受到广泛关注的一种便是太阳能,而多晶硅做为太阳能光伏行业的基本原料在国内却主要依靠进口。随着经济的发展,国内多晶硅行业目前正面临着产业升级的关键时期,企业对高纯多晶硅的需求更加强烈,同时对于所用到的石墨部件的纯度也要求的更加苛刻。虽在国外已拥有较成熟的完整制备工艺和生产设备,但国内还是起步阶段,并且受到了国外相关技术的封锁,所以到目前为止对于生产超高纯度石墨的碳净化设备还没有可行、有效解决的办法。碳净化炉设备就是消除石墨部件杂质,净化石墨的设备,对于原有的碳净化炉设备针对其发生的问题,进一步的研究、优化、设计,制造出符合工艺生产需要的设备。本文对原有的碳净化炉设备的腐蚀成分进行分析(利用SEM、EDS、XRD技术),最终得出设备内的附着物包括:六水氯化铬(CrCl_2·6H_2O)、六水氯化铁(FeCl_3·6H_2O)、四水氯化亚铁(FeCl_2·4H_2O)、四水氯化镍(NiCl_2·4H_2O)、镁铁矿(铁酸镁尖晶石构造复合氧化物,MgFe_2O_4)和二水氯化镍(NiCl_2·2H_2O)等晶体。根据所得的附着物,确定设备发生腐蚀的机理,高温环境下氯气会与设备发生化学反应,在不同的温度环境下产生的生成物不同,并且它们的物性粘稠,造成原设计中管路被堵,影响设备的正常运行。结合其他行业的方法措施进行设备的选材确定,而由于设备传热会直接影响到设备的选型、选材以及结构设计,所以把设备在工艺过程中可能的理论计算值以及利用Fluent有限元软件的模拟计算、实测值,进行对比研究分析,为设备的选型、选材以及结构设计提供理论基础。完成设备结构的优化,使得新设备能够进一步提高产品的质量,满足生产需要。
[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.
【学位授予单位】：青海大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB304

【相似文献】