磁力轴承透平膨胀压缩机在天然气处理上的应用

Application of turbo-expander compressor with magneticbearing on natural gas processing

磁力轴承透平膨胀压缩机是一种将磁场原理应用到旋转轴上,代替油润滑轴承膨胀压缩机的新型膨胀压缩机,是一次技术创新和突破。为更好地在天然气处理领域应用磁力轴承透平膨胀压缩机,梳理了磁力轴承透平膨胀压缩机在国内天然气处理上的应用现状,分析研究了磁力轴承透平膨胀压缩机的工作原理和特性。磁力轴承透平膨胀压缩机利用磁场力将转子悬浮起来,转子和定子之间没有机械摩擦,转速高,效率高,转子不易损坏,使整机性能更稳定可靠。其关键技术在于磁力平衡控制系统和安全停机系统,磁力平衡控制系统可调整和保证转子在高速运动中不偏离中心空间,安全停机系统可在失电磁场消失情况下防止转子掉落损坏。在此基础上,根据工程设计应用经验和现场操作情况,总结出密封气系统、工艺气质条件要求、软件系统可靠度、旁路J-T阀等工艺设计要点和特殊注意事项。研究结果可为天然气处理厂内膨胀压缩机的选型、维护、运行提供技术指导。

Turbo-expander compressor with magnetic bearing is a new type of expander with application of the magnetic field principle to the rotating shaft,replacing the oil lubrication system.It is a technological innovation and breakthrough.In order to enhance the application of turbo-expander compressor with magnetic bearing on natural gas processing,this paper presented its application status in domestic natural gas industry,analyzed its working principles and the characteristics.The rotor is suspended by magnetic force in the limited narrow space of the cavity,so that there is no mechanical friction between the rotor and stator.This bearing operates at high speed,high efficiency,the rotor is not easily damaged.The performance of the whole machine is therefore more stable and reliable.The key technologies of magnetic bearing turbo-expander compressor are the magnetic thrust balancing system and the safe shutdown system.The magnetic thrust balancing system adjusts and ensures the rotor does not deviate from the center space during the high speed movement.The safe shutdown system prevents the rotor from falling and damage when the magnetic field disappears.According to the engineering design and site operating experience,this paper summarized process design essentials and special considerations such as the seal gas system,process gas composition,the software system reliability and bypass J-T valves.The research results could provide technical guidance for selection,maintenance and operation of turbo-expander compressor in natural gas treatment plant.