The MRC mixed refrigerant compressor is the core power equipment of the LNG liquefaction section. It provides compression power for the closed-loop circulation of mixed refrigerant. It boosts the pressure of low-pressure mixed refrigerant exiting the cold box. After cooling and liquid separation, the refrigerant is fed back into the cold box to continuously supply cooling capacity for natural gas liquefaction. It serves as the “power heart” for skid-mounted and medium-small LNG liquefaction units. The working medium is mixed refrigerant composed of methane, ethylene, propane, isopentane and nitrogen.
Working Principle
Low-temperature and low-pressure mixed refrigerant enters the compressor and is pressurized via multi-stage impeller compression. The refrigerant heated by compression is discharged to air coolers or interstage coolers for cooling, and then flows into the refrigerant separator for phase separation. The separated gaseous and liquid refrigerant streams are delivered to the liquefaction cold box to complete the closed refrigeration cycle. An integrated anti-surge control system is equipped to ensure stable unit operation under a wide load range.
Core Advantages
✅ Integrally geared centrifugal construction with high efficiency, smooth operation and low vibration
✅ Optimised for MRC mixed refrigerant service; multi-stage compression with interstage cooling
✅ Self-contained lube oil station, anti-surge valve and instrument monitoring system
✅ Integrated skid design, fully assembled and tested at factory; ready for commissioning after on-site piping connection
✅ DCS remote monitoring available, with interlock protection against overspeed, abnormal oil pressure and overtemperature
✅ Suitable for skid-mounted LNG liquefaction, coalbed methane liquefaction and associated gas liquefaction projects
Technical Parameters (Example)
Design Medium: MRC mixed refrigerant
Inlet Pressure: 0.2~0.6 MPa
Outlet Pressure: 3.0~4.5 MPa
Control Mode: DCS + automatic anti-surge control
Drive Type: Motor-driven
Model Type: Integrally geared centrifugal
Applications
Skid-mounted LNG liquefaction units, small-scale natural gas liquefaction plants, coalbed methane and oilfield associated gas liquefaction projects
