分子蒸馏釜机械密封的应用与改进研究

发布时间：2018-05-30 02:26

本文选题：分子蒸馏釜 + 机械密封　；参考：《江苏大学》2017年硕士论文

【摘要】：分子蒸馏工艺在食品行业、精细化工、医药化工中应用非常广泛,而短程蒸馏釜是该工艺的重要、必备设备之一。分子蒸馏工艺必须在接近绝对真空的工况下操作,所以短程蒸馏釜必须要求达到接近零泄漏。而蒸馏釜搅拌轴上的机械密封是极易出现泄漏的部位,对整个蒸馏釜的影响极大,因此最佳的密封效果是保证蒸馏釜工作稳定较为关键的因素,对戓用机封进行应用研究具有特别重要的意义。为了提高机械密封的可靠性,延长使用寿命,获得稳定的生产条件,本文以公司现有的蒸馏釜机械密封作为研究对象,进行应用研究。首先对十几年来公司日常生产中四台蒸馏釜机械密封故障现象进行描述、统计与分析。再利用威布尔分布对公司使用的机封进行可靠性分析和评价,明确本课题研究的必要性。然后深入研究蒸馏釜机封的失效机理,找出机械密封失效与主轴摆动、冷却方式、密封材料的关系,为蒸馏釜机封的改造提供了方向。为了更好地解决蒸馏釜机械密封选型问题,通过对不同选型方法的比较研究,认为采用通用选型与层次选型相结合的方法是蒸馏釜机封适用的、有效的选型方法,并对端面比压与端面温升进行计算、验证,形成了系统可靠的选型方法,可供设计人员参考使用。最后在失效机理与选型方法研究的基础上,分析了现使用的207-200型机械密封存在的问题和不足,提出改进方法和措施,并通过机封的实际使用测试结果对改进前后机械密封的性能进行比较和验证,结果表明改进后的机械密封可靠性、稳定性得到了明显提高。同时,在此基础上提出了一套机械密封日常操作、维护、检修的措施和程序,以进一步降低机械密封故障率、延长运转周期。通过对机械密封的应用研究,获得一套有效的、可操作的、便捷的选型方法和维护管理方法,并获得性能良好、使用寿命更长的蒸馏釜机械密封,为稳定生产创造了良好的条件。
[Abstract]:Molecular distillation process is widely used in food industry, fine chemical industry and pharmaceutical chemical industry. The molecular distillation process must be operated under the condition of near absolute vacuum, so the short range distillation kettle must be close to zero leakage. The mechanical seal on the mixing shaft of the distillation kettle is easy to leak and has a great influence on the whole distillation kettle, so the best sealing effect is the key factor to ensure the stable operation of the distillation kettle. It is of great significance to study the application of machine seals. In order to improve the reliability of mechanical seal, prolong the service life and obtain stable production conditions, this paper takes the existing mechanical seal of distillation kettle as the research object, carries on the application research. This paper first describes, statistics and analyses the mechanical seal failure of four distillers in the daily production of the company for more than ten years. Then the reliability analysis and evaluation of the machine seal used by the company are carried out by using Weibull distribution, and the necessity of this research is clarified. Then the failure mechanism of the machine seal of the distillation kettle is studied deeply, and the relationship between the failure of the mechanical seal and the spindle swing, cooling mode and sealing material is found out, which provides the direction for the revamp of the machine seal of the distillation kettle. In order to better solve the problem of mechanical seal selection of distillation kettle, through the comparative study of different selection methods, it is considered that the general selection method combined with hierarchical type selection method is a suitable and effective selection method for the machine seal of distillation kettle. The specific pressure of the end face and the temperature rise of the end face are calculated and verified, and the reliable selection method of the system is formed, which can be used for reference by the designers. Finally, on the basis of the study of failure mechanism and selection method, the problems and shortcomings of 207-200 type mechanical seal are analyzed, and the improvement methods and measures are put forward. The performance of the mechanical seal before and after the improvement is compared and verified by the practical test results of the mechanical seal. The results show that the reliability and stability of the improved mechanical seal are obviously improved. At the same time, a set of routine operation, maintenance and repair measures and procedures are put forward to further reduce the failure rate of mechanical seal and prolong the running period. Through the research on the application of mechanical seal, a set of effective, operable and convenient selection method and maintenance management method are obtained, and the mechanical seal of distillation kettle with good performance and longer service life is obtained. Good conditions have been created for stable production.
【学位授予单位】：江苏大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH136

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