CO2 Compressors from China Suppliers | High-Quality Factory Solutions for CCS, Urea Synthesis & Refrigeration
Advantages of Carbon Dioxide Diaphragm Compressor
Absolutely Oil-Free and 100% Purity Retention
The core of a diaphragm compressor lies in its use of a metal diaphragm to completely physically isolate the compressed gas from the hydraulic oil system. The cylinder requires no lubrication. This means that during the entire compression process, carbon dioxide gas does not come into contact with any grease or oil mist, fundamentally eliminating oil contamination. For food-grade CO₂, electronic-grade CO₂, or CO₂ used in high-end chemical synthesis, this characteristic ensures extremely high cleanliness and chemical purity of the product gas, fully meeting the most stringent application standards.
Superior Static Sealing and Intrinsic Safety
The carbon dioxide gas is completely sealed within the "diaphragm cavity" formed by the diaphragm and cylinder head. This is a static sealing structure that theoretically achieves zero leakage. This not only effectively prevents the loss of valuable or hazardous gases, but also completely eliminates the asphyxiation safety risk caused by CO₂ accumulation in low-lying areas due to leakage. Simultaneously, this structure prevents potentially corrosive moist CO₂ from eroding the transmission components, enhancing the operational reliability of the equipment under harsh conditions.
Key Design Points for Carbon Dioxide Diaphragm Compressor
Strict Material Selection for Corrosion Protection
Since carbon dioxide forms carbonic acid when co-existing with moisture, which is corrosive to ordinary carbon steel, all flow-wetted components in contact with CO₂—including the cylinder head, diaphragm, gas valves, and piping—must be manufactured from corrosion-resistant materials. Austenitic stainless steels (such as 304, 316L) are typically selected, and strict degreasing, cleaning, and passivation treatments are performed after manufacturing to ensure lasting corrosion resistance and gas purity.
Precise Control and Anti-Liquefaction Design
The critical temperature of carbon dioxide is 31.03 °C. During compression, if cooling is insufficient and the gas temperature falls below this critical value while the pressure is high enough, a phase change to liquid is highly likely. Liquid CO₂ inside the compressor can cause a fatal "liquid hammer" phenomenon, damaging the diaphragm and cylinder head. The design must involve carefully calculating and controlling the compression ratio at each stage, and configuring high-efficiency interstage coolers (water-cooled or air-cooled) to ensure that the discharge temperature at each stage is effectively lowered. This strictly confines the operating points of the entire compression path to the gaseous region of CO₂, avoiding the risk of liquefaction.
Enhanced Safety Monitoring and Protection
Given the large coefficient of expansion of CO₂ under high-pressure storage (the pressure of a full cylinder can surge by 314 – 834 kPa for every 1 °C rise in temperature), the system must integrate multiple protections. Key design elements include: setting up accurate and reliable safety valves at each stage to prevent overpressure; equipping a diaphragm rupture detection and alarm device that can immediately alarm and shut down the compressor upon diaphragm failure to prevent gas-oil mixing; and installing gas concentration monitors in areas where CO₂ may accumulate, linked to the ventilation system. The control system (PLC) should integrate real-time monitoring and interlock shutdown functions for parameters such as pressure, temperature, and diaphragm status.
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Model Selection
| No. | Model | Cooling Water | Flow | Inlet Pressure | Outlet Pressure | Dimensions L×W×H | Weight | Motor Power |
|---|---|---|---|---|---|---|---|---|
| (L/h) | (Nm³/h) | (MPa) | (MPa) | (≈mm) | (≈kg) | (kW) | ||
| 1 | GZ-52/40-56 | 500 | 52 | 4 | 5.6 | 1200×700×1100 | 450 | 3 |
| 2 | GZ-15/10-12 | 500 | 15 | 1 | 1.2 | 1200×700×1100 | 500 | 3 |
| 3 | GZ-20/7-30 | 500 | 20 | 0.7 | 3 | 1200×760×1100 | 750 | 4 |
| 4 | GV-60/8-60 | 1000 | 60 | 0.8 | 6 | 2600×1800×1700 | 3000 | 11 |
| 5 | GV-500/150-200 | 1500 | 500 | 15 | 20 | 2600×1800×1700 | 3000 | 18.5 |
| 6 | GV-160/（6-10）-75 | 2000 | 160 | 0.6-1 | 7.5 | 2600×1800×1700 | 3000 | 22 |
| 7 | GL-20/10-150 | 1500 | 20 | 1 | 15 | 2200×1200×1300 | 3000 | 15 |
| 8 | GL-25/5-150 | 1500 | 25 | 0.5 | 15 | 2200×1200×1300 | 3000 | 15 |
| 9 | GL-45/5-150 | 2000 | 45 | 0.5 | 15 | 2600×1300×1300 | 3000 | 18.5 |
| 10 | GD-40/150 | 4000 | 40 | Atmospheric | 15 | 3500×2000×1700 | 4000 | 37 |
| 11 | GD-300/50-200 | 4000 | 300 | 5 | 20 | 3600×2300×1800 | 4000 | 45 |
| 12 | GD-900/10-140 | 16000 | 900 | 1 | 14 | 4500×4000×2200 | 16000 | 200 |
The equipment size and weight are for reference only, and the final design shall prevail.
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Frequently Asked Questions
Why is a diaphragm compressor preferred for high-purity carbon dioxide applications?
A diaphragm compressor uses a metal diaphragm to completely physically isolate the compressed gas from the hydraulic oil system. Because the cylinder requires no lubrication, the gas does not come into contact with grease or oil mist, guaranteeing absolute purity for food-grade or electronic-grade CO₂.
How does the static sealing design improve safety?
The CO₂ gas is completely sealed within the diaphragm cavity, creating a static sealing structure that achieves zero leakage. This prevents the escape of dangerous or valuable gases and eliminates the risk of asphyxiation caused by CO₂ accumulating in low-lying areas.
What materials are used to prevent corrosion in CO₂ compressors?
Since moist carbon dioxide forms corrosive carbonic acid, all flow-wetted components (such as cylinder heads, diaphragms, gas valves, and piping) are manufactured from corrosion-resistant austenitic stainless steels like 304 or 316L, followed by strict degreasing and passivation treatments.
How does the system prevent the risk of CO₂ liquefaction and liquid hammer?
The critical temperature of CO₂ is 31.03 °C. To prevent the gas from liquefying under high pressure, the compressor is designed with precise stage compression ratios and high-efficiency interstage coolers to keep the operating path strictly within the gaseous region.
What safety monitoring features are integrated into the compressor system?
The system features safety valves at each stage, a diaphragm rupture detection and alarm device to prevent oil-gas mixing, and gas concentration monitors linked to a PLC system that handles real-time monitoring and interlock shutdowns.