喷液螺杆压缩机属于无油压缩机,兼具了离心压缩机和往复压缩机的优点,压比高,调节范围宽,运转稳定且易损件少;合理的喷液可以吸收压缩过程热,降低排气温度,节省压缩耗功,有效提高机组的使用性能,适合用于含粉尘、含液体及易聚合的工艺气压缩机。通过对喷液螺杆压缩机结构及原理的介绍,结合UOP丙烷脱氢工艺流程特点,对氢气压缩机的选型进行比选,从材料选择、机组配置、系统设计和可靠性等方面,对喷液螺杆压缩机的应用进行分析。分析结果表明：在UOP丙烷脱氢工艺流程中,由于氢气中含有一定的水分,压缩冷却后会产生凝液，便于喷液螺杆压缩机的实施；喷液螺杆压缩机的使用，可以在占地、维护和调节等方面都带来优势。喷液螺杆压缩机能适应UOP丙烷脱氢工艺流程中氢气压缩机的使用需求，并能有效提升其使用性能。

Fluid-injected screw compressor belongs to the oil-free compressor type and has the advantages of both centrifugal compressor and reciprocating compressor, namely high compression ratio, wide capacity adjustment range, stable operation and less parts prone to wear and tear. Optimum fluid injection can absorb the heat generated from compression process, reduce the process fluid discharge temperature, lower the power consumption and effectively improve the operating performance. Fluid-injected screw compressor is suitable to be used as the compressor for process gas containing dust and liquid or gas that polymerise easily. This paper presents the selection of hydrogen compressor, based on the mechanical design and operating principle of fluid-injected screw compressor, and taking into consideration the characteristics of the UOP PDH process. The application of fluid-injected screw compressor is analysed from the aspects of material selection, equipment unit configuration, process system design and reliability in operation. The result shows that, in UOP PDH process, application of the fluid-injected screw compressor is a natural choice as the hydrogen gas contains a certain amount of moisture and condensate will drop out after the compression and cooling process. Furthermore, the use of fluid-injected screw compressor can bring certain advantages in such aspects as plot size, maintenance and capacity adjustment. Fluid-injected screw compressor can adapt to the requriements of the hydrogen compressor in the DOP PDH process, and can improve the compressor’s performance effectively.