China Ethylene Compressors - High-Efficiency Factory Suppliers for Ultra-Low Temperature Applications
Ethylene Diaphragm Compressor Advantages
01
Absolutely Oil-Free & Ultra-High Purity Assurance
The diaphragm isolation technology ensures that the gas is 100% free from contact with lubricating oil during compression, achieving a compression purity of over 99.999%. This is critical for "polymer-grade" ethylene used as a polymerization feedstock, where even trace oil contamination can affect catalyst activity, leading to product quality degradation or even polymerization failure.
02
Static Seal Zero Leakage & Intrinsic Safety
The entire gas chamber employs a static seal structure, fundamentally eliminating the possibility of gas leakage. For ethylene, which has a wide explosion limit and high hazard level, this feature provides the highest level of safety assurance, effectively preventing the accumulation of flammable gas in the plant area and meeting the most stringent safety production and environmental protection requirements.
Key Design Points for Ethylene Diaphragm Compressors
01
Precise Anti-Liquefaction & Temp Control
Given that the critical temperature of ethylene (9.21°C) is close to ambient temperature, it is highly prone to liquefaction during compression and cooling, which can cause "liquid slugging." The design must include accurate thermodynamic calculations to ensure that the discharge temperature and the gas temperature after inter-stage cooling always remain above the dew point at the corresponding partial pressure, with a sufficient safety margin. The cooling system must be efficient and reliable to prevent gas condensation within the chamber or piping.
02
High-Pressure & Material Compatibility
To meet the demands of processes such as ultra-high-pressure polyethylene synthesis, the compressor must adopt a multi-cylinder series arrangement or a specially reinforced structure to achieve discharge pressures exceeding 100 MPa. Materials for wetted parts are typically selected as 316L stainless steel or higher-grade alloys to ensure high-pressure strength while providing excellent chemical inertness, preventing any adverse reactions with ethylene. The use of copper and its alloys is strictly prohibited to avoid catalyzing the formation of hazardous polymers from ethylene.
03
Multi-Layered Safety Monitoring
A three-layer diaphragm structure is standard, equipped with a diaphragm rupture monitoring and alarm device. If the inner diaphragm is damaged, the system can immediately trigger an alarm and safely shut down. The system must integrate interlocks such as high discharge temperature and pressure alarms, as well as oil pressure protection. For process connections, nitrogen purge connections should be to allow for inerting and purging of the system before startup, ensuring safe operation.
Certificates
Model Selection
| Model | G70Z/G95Z/G110Z/G130Z | Piston Stroke | 70mm~130mm |
|---|---|---|---|
| Maximum Piston Force | 10KN~30KN | Maximum Discharge Pressure | 70Mpa |
| Flow Range | 1~500Nm³/h | Motor Power | 2.2KW~30KW |
| Crankshaft Speed | 420rpm | Cooling Method | Water Cooled/Air Cooled |
| Model | G70V/G95V/G130V | Piston Stroke | 70mm~130mm |
|---|---|---|---|
| Maximum Piston Force | 10KN~30KN | Maximum Discharge Pressure | 50Mpa |
| Flow Range | 1~200Nm³/h | Motor Power | 2.2KW~30KW |
| Crankshaft Speed | 420rpm | Cooling Method | Water Cooled/Air Cooled |
| Model | G110L/G130L | Piston Stroke | 110mm~130mm |
|---|---|---|---|
| Maximum Piston Force | 20KN~40KN | Maximum Discharge Pressure | 100Mpa |
| Flow Range | 10~1000Nm³/h | Motor Power | 7.5KW~90KW |
| Crankshaft Speed | 420rpm | Cooling Method | Water Cooled/Air Cooled |
| Model | G110D/G130D/G150D/G180D/G182D/G210D | Piston Stroke | 110mm~210mm |
|---|---|---|---|
| Maximum Piston Force | 20KN~160KN | Maximum Discharge Pressure | 100Mpa |
| Flow Range | 30~2000Nm³/h | Motor Power | 22KW~200KW |
| Crankshaft Speed | 420rpm | Cooling Method | Water Cooled/Air Cooled |
| No. | Model | Cooling Water (L/h) | Flow (Nm³/h) | Inlet Pressure (MPa) | Outlet Pressure (MPa) | Dimensions L×W×H (≈mm) | Weight (≈kg) | Motor Power (kW) |
|---|---|---|---|---|---|---|---|---|
| 1 | GZ-18/5.3-12.5 | 500 | 18 | 0.53 | 1.25 | 1000×800×1100 | 800 | 5.5 |
| 2 | GZ-30/20-60 | 500 | 30 | 2 | 6 | 1100×800×1100 | 800 | 7.5 |
| 3 | GZ-22/7-30 | 1000 | 22 | 0.7 | 3 | 1200×800×1100 | 800 | 11 |
| 4 | GV-20/7-150 | 1000 | 20 | 0.7 | 15 | 1400×800×1100 | 900 | 11 |
| 5 | GV-118/（34.5-44.5）-55 | 1000 | 118 | 3.45-4.45 | 5.5 | 1400×800×1100 | 1000 | 11 |
| 6 | GV-160/（0.35-10.5）-30 | 2000 | 160 | 0.035-1.05 | 3 | 2600×1800×1600 | 3000 | 18.5 |
| 7 | GL-55/3 | 1000 | 55 | Atmospheric | 0.3 | 2200×1800×1600 | 2800 | 11 |
| 8 | GL-130/0.3-0.5 | 1500 | 130 | 0.03 | 0.05 | 2300×1800×1600 | 2800 | 11 |
| 9 | GL-40/0.2-25 | 2000 | 40 | 0.02 | 2.5 | 2300×1800×1600 | 2800 | 18.5 |
| 10 | GD-180/2.3-61.3 | 4500 | 180 | 0.23 | 6.13 | 3800×2300×1800 | 6000 | 45 |
| 11 | GD-1076/（17-24）-125 | 10000 | 1076 | 1.7-2.4 | 12.5 | 4200×3200×2200 | 12000 | 132 |
| 12 | GD-945/11.7-126 | 15000 | 945 | 1.17 | 12.6 | 4200×3500×2200 | 12000 | 160 |
* The equipment size and weight are for reference only, and the final design shall prevail.
Case Study
Frequently Asked Questions
Ethylene diaphragm compressors offer 100% oil-free compression, ensuring high purity exceeding 99.999% which is critical for polymer-grade ethylene. Additionally, their static seal design ensures zero leakage, providing intrinsic safety for handling explosive and hazardous gases.
Ethylene is a highly volatile gas with a wide explosion limit. Standard dynamic seals are prone to micro-leakages. The static seal structure of diaphragm compressors completely isolates the process gas, eliminating potential gas leaks and ensuring a safe operating environment.
Ethylene’s critical temperature is 9.21°C, which is close to ambient levels. If cooled too much under pressure, it liquefies. The compressor design utilizes advanced thermodynamic calculations and efficient cooling control to ensure the gas temperature remains safely above its dew point at all stages, preventing liquid accumulation.
High-grade stainless steel like 316L is typically used for all wetted components to prevent chemical reactions under ultra-high pressures (up to 100 MPa). The use of copper and its alloys is strictly prohibited because copper can act as a catalyst to form explosive acetylides when interacting with trace impurities in ethylene processes.
They feature a standard three-layer diaphragm system equipped with a rupture alarm device. If any layer fails, the alarm triggers an automatic safety shutdown before leakage occurs. The units also integrate interlocks for high discharge temperatures, oil pressure drops, and system nitrogen purges.
Yes, depending on the model and the layout requirements of your facility, the compressors can be configured with either water-cooled or air-cooled systems to match standard plant utilities.