High-Performance Ethylene Compressors from 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 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.

To meet processes like ultra-high-pressure polyethylene synthesis, the compressor adopts a multi-cylinder series or reinforced structure for pressures over 100 MPa. Wetted parts are 316L stainless steel or higher alloys to ensure high strength and chemical inertness. The use of copper and its alloys is strictly prohibited to avoid catalyzing hazardous polymers.

A standard three-layer diaphragm structure is equipped with a rupture monitoring alarm device. If the inner diaphragm is damaged, the system safely shuts down. It integrates interlocks for high discharge temperature/pressure and oil pressure protection, along with nitrogen purge connections for safe inerting before startup.