海洋平台油气混输泵轴端密封改进设计与试验研究

Improved Design and Experimental Research on the Shaft End Seal of Oil-gas Multiphase Pumps on Offshore Platforms

针对某海洋平台油气混输泵轴端机械密封在运行过程中存在的失效问题,分析其产生的原因,并对其结构进行改进设计。对改进后机械密封进行实验室台架性能试验,分析不同弹簧比压条件下密封性能随压力的变化和密封端面磨损状况,以及不同端面设计宽度下密封性能随压力和转速的变化。结果表明:减小弹簧比压能略微降低密封端面摩擦功率,但会增大泄漏风险;减小端面宽度能有效提升润滑不良条件下的端面密封性能。确定密封优选设计参数,并对密封样机进行100 h型式试验。试验结果表明,改进后密封端面摩擦功率基本稳定,波动较小,泄漏量满足标准指标要求,验证了该密封结构改进的合理性、优选设计参数的有效性和运行工况的适应性。

Aimed at the operating failure problem of a shaft end mechanical seal of the oil-gas multiphase pump on the offshore platform,the causes were analyzed,and the structure was improved.Through the performance test of the improved mechanical seal,the change of sealing performance with pressure the wear condition of sealing end face under different spring specific pressure conditions were compared and analyzed,and the change of sealing performance with pressure and rotational speed under different end face widths was compared and analyzed.The results show that reducing the spring spe⁃cific pressure can slightly reduce the friction power of the seal end face,but it will increase the risk of leakage,and reduc⁃ing the end face width can effectively improve the sealing performance under poor lubrication conditions.The optimal design parameters of the seal were determined,and the 100 h qualification test of the domestic sealing prototype was carried out.The stability of the friction power of the sealing end face and the leakage index during its operation were examined.The ex⁃perimental results show that the friction power of the improved sealing end face is basically stable,with small fluctuations,and the leakage meets the standard index requirements.This verifies the rationality of the improved sealing structure,the ef⁃fectiveness and the adaptability of operating conditions of optimizing design parameters.