High-Efficiency Ethylene Compressors from Reliable China Suppliers and Factory for Ultra-Low-Temperature Applications

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.

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.

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 includes 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 is highly efficient and reliable to prevent gas condensation within the chamber or piping.

To meet the demands of processes such as ultra-high-pressure polyethylene synthesis, the compressor adopts a multi-cylinder series arrangement or a specially reinforced structure to achieve discharge pressures exceeding 100 MPa. Materials for wetted parts are selected as 316L stainless steel or higher-grade alloys to ensure high-pressure strength while providing excellent chemical inertness, preventing adverse reactions with ethylene. The use of copper and its alloys is strictly prohibited to avoid catalyzing the formation of hazardous polymers.

A three-layer diaphragm structure is standard, equipped with a diaphragm rupture monitoring and alarm device. If the inner diaphragm is damaged, the system immediately triggers an alarm and safely shuts down. The system integrates interlocks such as high discharge temperature and pressure alarms, as well as oil pressure protection. For process connections, nitrogen purge connections allow for inerting and purging of the system before startup, ensuring safe operation.