LPG泵机械密封的失效分析及结构优化

发布时间：2018-01-07 04:06

本文关键词：LPG泵机械密封的失效分析及结构优化　出处：《北京化工大学》2011年硕士论文　论文类型：学位论文

【摘要】：在化工介质中,LPG(液化石油气)是一种特性极不稳定的危险介质；非常容易气化,具有低引火点、低粘度等特征；本论文对LPG泵用机械密封进行失效分析和结构改进,改进之后的机械密封具有动压槽结构,可以极大的降低机械密封端面的发热温度,改善了LPG泵机械密封寿命低,维修率高等情况。论文对端面发热情况进行了理论计算,并通过计算得出影响端面发热情况的主要因素,根据理论计算的结果修改端面参数；对比了单级机械密封和双级机械密封的优缺点,提出了使用双级机械密封在LPG泵上应用的观点。通过实验数据证明,理论计算方面所修改的数据在工业试验上是正确的,且双级机械密封比单级密封在各项实验数据上都体现出极大的优势。通过研究和分析数起机械密封泄漏引发的事故,来引出工程应用上对于LPG泵机械密封的技术要求和寿命要求,在具体的工程设计过程中,通过理论计算和实验数据的采集研究,把LPG泵机械密封的结构优化应用于工程实践,取得了现役LPG泵密封改造的成功,获得了较好的技术应用和经济效益。
[Abstract]:LPG (liquefied petroleum gas) is a dangerous medium with extremely unstable characteristics in chemical media. Very easy gasification, with low ignition point, low viscosity and other characteristics; In this paper, the failure analysis and structural improvement of mechanical seal used in LPG pump are carried out. The improved mechanical seal has the structure of dynamic pressure slot, which can greatly reduce the heating temperature of the end face of mechanical seal. Improve the LPG pump mechanical seal life low, high maintenance rate and so on. In this paper, the end surface heating is calculated theoretically, and the main factors influencing the end surface heating are obtained, and the end face parameters are modified according to the results of the theoretical calculation. The advantages and disadvantages of single-stage mechanical seal and two-stage mechanical seal are compared, and the application of two-stage mechanical seal in LPG pump is put forward. The modified data in theoretical calculation are correct in the industrial test, and the two-stage mechanical seal is superior to the single-stage seal in all the experimental data. Through the research and analysis of several accidents caused by mechanical seal leakage, the technical requirements and life requirements of mechanical seal for LPG pump in engineering application are derived in the specific engineering design process. Through theoretical calculation and experimental data collection, the structure optimization of mechanical seal of LPG pump is applied to engineering practice, and the successful renovation of seal of active LPG pump has been achieved. Good technical application and economic benefit have been obtained.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH136

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