Over the past few years, there were several liquefied natural gas plants commissioned in Russia. These facilities operate under licensed liquefaction technologies and mainly use foreign dynamic equipment. In 2017, for the first time in Russia, it was decided to use the domestic dynamic equipment: K905-71-1C centrifugal compressor. The article considers the course of prototype design of the mixed refrigerant centrifugal compressor by REP Holding and benefits and shortcomings of existing design methods. The paper sets out the leading gas-to-liquids technologies and their corresponding thermodynamic cycles. The critical role of the compressor operating conditions in the process flow diagram has been determined for choosing the circuit diagram of a centrifugal compressor, as well as the importance of experimental research on model stages of the impellers.The key approaches have been examined to recalculating the gas-dynamic behavior of compressors after the manufacturer’s bench test to confirm the design parameters of the flowpaths in nominal mode and compliance of the gas-dynamic behavior with the requirements of the technical specifications. The study reveals the main benefits and drawbacks of the existing calculation methods according to the most widely used international standards, as well as the advantages of using a closed-loop bench with model gas. The most efficient methods of calculating similarity coefficients have been determined. The strength calculations performed in the design stage for integral impellers and segmental oil bearings have been analyzed. The paper also shows the advantages of vacuum overspeed testing of centrifugal compressor impellers.
Keywords: MIXED REFRIGERANT CENTRIFUGAL COMPRESSOR, SIMILARITY CRITERIA, MODELING THE GAS-DYNAMIC BEHAVIOR OF MIXED REFRIGERANT CENTRIFUGAL COMPRESSOR.