基于ANSYS稳态传热数值模拟方法的机械密封失效分析

Mechanical Seal Failure Analysis Based on ANSYS Steady Heat Transfer Numerical Simulation Method

在机泵失效故障中,因机械密封泄漏失效而引起的泄漏事故占比很高。以往机械密封失效原因分析都采用以经验性定性分析为主的传统分析方法,存在明显弊端。利用ANSYS有限元分析软件,基于稳态传热理论,采用以定量分析为主、定性分析为辅的数值模拟方法,对频繁失效的某乙烯装置脱丁烷塔循环泵2648型机械密封摩擦副进行稳态传热分析与对比,得到了摩擦接触面路径线性温度分布云图,认为机械密封摩擦接触面局部温度过高是引起摩擦副端面磨损的根本原因。通过选用3648型机械密封和配套的Plan53B隔离系统,改善了机械密封运行条件,实现了机械密封长周期运行。

The leakage accidents caused by mechanical seal leakage failure account for a high proportion of pump failure faults.The traditional analysis methods mainly based on empirical qualitative analysis were used for failure cause analysis of mechanical seals,which had obvious disadvantages.By using ANSYS finite element analysis software and based on steady-state heat transfer theory,the steady-state heat transfer analysis and comparison of friction pairs of mechanical seal type 2648 of circulating pump in debutane tower of an ethylene unit with frequent failures were carried out by numerical simulation method with quantitative analysis as the main method and qualitative analysis as the auxiliary method,and the linear temperature distribution cloud diagram of friction contact surface path was obtained.It is considered that excessive local temperature of the friction contact surface of mechanical seal is the basic cause of end wear of friction pair.By choosing the 3648 type mechanical seal and matching the Plan53B isolation system,the operating conditions of the mechanical seal were improved and the long-term operation of the mechanical seal was realized.