渣油高压进料泵PLAN54密封故障分析及创新应用

FAULT ANALYSIS ON THE PLAN54PUMP IN RESIDUE HIGH-PRESSURE FEED PUMP AND INNOVATIVE APPLICATION

国内渣油加氢装置日益增多,高压进料泵逐渐向着高温、高压、大流量趋势发展,对机械密封的要求越来越严格。对国内渣油加氢装置高压进料泵密封调研的结果显示,其平均使用寿命不足1年,甚至有部分装置密封寿命不足2个月。高温渣油外漏是极其危险的。近年来,部分新建渣油加氢装置高压进料泵密封设计为PLAN54,但在前期的应用过程中也发现很多问题。在没有可供经验借鉴的情况下,通过不断的摸索改进,创新应用了密封组合方案,使改进后的机械密封寿命由最初的几天延长到现在的790d。文章对国内某套渣油加氢装置应用的PLAN54密封进行了故障分析,并提出了有效的改进方法。

The number of domestic RDS units is increasing.And the high-pressure feed pump is developing toward high temperature,high pressure and large flow,requirements for mechanical seals are becoming more stringent.Investigation results of the high-pressure feed pump seal in domestic RDS units show that the average service life of the seals is less than one year and some even fail within two months.Leakage of high temperature residual oil is extremely dangerous.In recent years,high-pressure feed pump seal of some new residue hydrotreating units has been designed as PLAN54,but many problems have been found in the early application process.Without experience for reference,the seal combination scheme is applied innovatively after constant exploring and improving.And the service life of the improved mechanical seal is prolonged to 790 days now from a few days at the very beginning.This paper makes a fault analysis on the PLAN54 seal used in certain domestic RDS unit and presents effective method for improvement.