多级压缩机气阀寿命评估与极限含水量预测

Service Life Evaluation and Ultimate Water Content Prediction on Gas Valve of Multistage Compressor

针对目前油田天然气回注具有介质含水多、压力高且变化范围宽等特点,多级往复式压缩机容易产生水击破坏,如何预测极限含水量以有效防止水击是亟需解决的关键问题。采用计算流体力学方法,数值模拟并分析了多级压缩机注入湿气条件下各级气阀阀片的动力学特性,得到了不同天然气含水量的气阀阀片载荷分布。进一步结合nCode计算疲劳,预测了多级压缩机气阀服役寿命与极限含水量。JGC-4型压缩机模拟计算结果表明:随着进气含水量增大,压缩机排气压力提高,气缸内不断析出水滴,致使水击产生,且对高压级影响更为显著,压缩机整机进气含水体积分数上限为0.43%。研究结果可为多级往复式压缩机的应用提供技术支撑。

Gas reinjection in oilfields has the characteristics such as water contained in medium,high and wide variable range of pressure,the multistage reciprocating compressor is easily damaged by water hammer.How to predict the ultimate water content to effectively prevent water hammer is a key issue that urgently needs to be solved.In this paper,with the help of the computational fluid dynamics method,the dynamic characteristics of all levels of gas valve plates in multistage compressor under wet gas injection conditions were numerically simulated and analyzed,obtaining the load distribution of gas valve plates under different water contents of natural gas.Then,using the nCode software,the service life and ultimate water content of gas valves in multistage compressor were predicted.The simulation calculation results of JGC-4 compressor show that as the water content of incoming gas increases,the discharge pressure of the compressor increases,and water droplets continuously separates in the cylinder,causing water hammer to occur,which has more obvious influence on high pressure stage.The upper limit of water content in incoming gas of the compressor is 0.43%.The research results provide technical support for the application of multistage reciprocating compressors.