Abstract: The refrigeration compressor used in the large and medium-sized natural gas liquefaction device adopts mixed refrigerant, and has the characteristics of large flow, low temperature, and requires a large operating range. In the actual operation, the refrigerant’ s molecular weight is great, and its composition varies. They easily lead to problems of insufficient reliability, such as performance deviation, low efficiency, excessive vibration (air flow excitation), thrust overload, etc. , so the qualified product has been long-term dependent on imports. China Huanqiu Contracting & Engineering Corp. and Shenyang Turbine Machinery Co. Ltd. developed a three-element/ variable impeller with large flow coefficient and high efficiency, which are suitable for multi-variable components, and optimized the compressor inlet and outlet scroll structure, improved the stability of the rotor design, improve the adaptability of the airflow excitation, so as to achieve localization of this kind of products. The actual operation shows that the compressor performance fully meets the design expectations.

摘要： 采用混合冷剂制冷的大中型天然气液化装置中的冷剂压缩机流量大、温度低、要求操作范围大, 在开车 到实际运行中, 冷剂分子质量大且组成多变, 易导致性能偏离、效率低、振动超标(气流激振)、推力过载等可靠性不 足的问题, 长期依赖进口。中国寰球工程公司和沈阳透平机械股份有限公司针对运行工况特点, 开发出适合多变组分 的大流量系数、高效率的三元叶轮, 通过优化压缩机进、排气蜗式结构提高效率, 改善转子稳定性设计, 提高气流激 振的适应性, 实现了设备国产化, 现场实际运行表明, 压缩机性能完全达到了设计预期。

关键词: 天然气液化装置, 混合冷剂, 离心压缩机, 流量系数, 效率