LNG高压泵扩压器导流叶片的结构优化研究  

Study on the Structural Optimization of Diffuser Guide Vanes for LNG High-Pressure Pump Expander

作　　者：杨林春 YANG Linchun(PetroChina Jiangsu Liquefied Natural Gas Co.,Ltd.,Nantong 226000,China)

机构地区：[1]中石油江苏液化天然气有限公司,江苏南通226000

出　　处：《材料保护》2025年第4期167-174,共8页Materials Protection

基　　金：中国石油集团公司一线创新基金项目(CXJJ-2021-021,CXJJ-2022-037,CXJJ-2023-002_48)资助。

摘　　要：京唐液化天然气(LNG)接收站进口高压泵导流叶片频繁失效,可能会产生金属碎片,威胁下游系统安全。为了延长导流叶片的使用寿命,使用ANSYS进行建模,对高压泵的扩压器导流叶片进行强度仿真计算和疲劳仿真分析。结果表明:越靠近轮毂处,叶轮叶片越容易出现裂纹或者断裂,入口边根部存在较高的疲劳断裂风险。更换铸铝材料为锻铝6061-T6时,其力学性能显著提升。当导流叶片厚度由3.5 mm增至5.0 mm时,叶片根部的膜加弯曲应力降低了40%~50%。增大导流叶片根部的倒角有效减少了应力集中,从而降低了裂纹产生的风险,显著提高了叶片的抗疲劳性能。根据工程应用数据,上述改进能够有效解决LNG高压泵在实际运行中存在的问题,提升泵的可靠性和安全性,确保LNG输送系统的稳定运行。The guide vanes of the high-pressure pump at the Jingtang LNG receiving station frequently fail,potentially generating metal frag-ments that threaten the safety of downstream systems.In order to extend the service life of the guide vanes,ANSYS software was used to estab-lish a model and conduct strength simulation calculations and fatigue simulation analysis on the diffuser guide vanes of the high-pressure pump.Results showed that cracks or fractures were more likely to occur near the hub of the impeller blades,with an increased risk of fatigue fracture at the root of the inlet edge.By changing the material from cast aluminum to forged aluminum 6061-T6,the mechanical properties were signifi-cantly improved.Additionally,it was found that when the thickness of the guide vane was increased from 3.5 mm to 5.0 mm,the membrane plus bending stress at the root was reduced by 40%to 50%.Enlarging the root fillet of the guide vane effectively reduced stress concentration,thereby decreasing the risk of crack initiation and significantly enhancing the fatigue resistance of the blade.Based on engineering application data,these improvements effectively resolved the operational issues encountered in the LNG high-pressure pump,enhancing its reliability and safety,and ensuring the stable operation of the LNG transmission system.

关 键 词：液化天然气 高压泵 导流叶片 结构优化 

分 类 号：TG174.4[金属学及工艺—金属表面处理]