In the carbon dioxide (CO?) gas recovery system, the NEUMAN ESSER 2TZS25 - 250/120 CO? compressor plays a crucial role in providing compression power for the recovery system. Through reciprocating piston movement, this compressor pressurizes the collected low-pressure CO? gas to a range of 1.9 - 2.1 MPa, creating essential conditions for subsequent liquefaction, storage, and transportation.Since it was put into operation, the cumulative operating time has reached 5 years. During the long-term operation, the equipment has provided important guarantees for the stable development of production. However, with the increase in operating time, some components have gradually experienced problems such as wear and aging, which have had a certain impact on the operating efficiency and safety of the equipment. Therefore, this overhaul work has been initiated.

Spare Parts
In accordance with the overhaul technical plan and the equipment component list, various types of spare parts required for this overhaul have been prepared, including piston rings, sealing rings, bearings, valves, gaskets, etc.

Component Inspection and Maintenance
Cylinder inspection and maintenance
Piston and piston ring inspection and maintenance
Connecting rod and crankshaft inspection and maintenance
Gas valve inspection and maintenance
Inspection and maintenance of other components
Performance
Discharge Pressure: During the operation of the equipment, the discharge pressure is monitored in real time through a pressure gauge. The test results show that the discharge pressure of the equipment is stably maintained at 20 bar, which meets the production requirements for discharge pressure. Moreover, the pressure fluctuation range is small and within the allowable range.
Discharge Temperature: The discharge temperature of each stage of the cylinder is monitored in real time through a thermometer, and the measurement data is recorded. The test results indicate that the discharge temperature of each stage of the cylinder is within the allowable range specified in the equipment design. Additionally, the temperature distribution is uniform without local overheating, which shows that the equipment's cooling system is operating normally and can effectively reduce the discharge temperature.
Noise and Vibration Testing: Under the equipment's rated working conditions, a noise tester and a vibration detector are used to test the noise value and vibration value of the equipment respectively. The test results show that the noise value of the equipment is 78 dB and the vibration value is 0.6 mm/s, both complying with the standards.