Membrane separation technology is the core component of modern three-stage vapor recovery units. This advanced process enables efficient separation of hydrocarbon vapors from air, achieving recovery rates exceeding 99% while meeting strict environmental standards.
How Membrane Separation Works
The membrane module contains specialized polymer membranes that selectively permeate hydrocarbon molecules while blocking nitrogen and oxygen. When fuel vapors pass through the membrane under pressure, hydrocarbons dissolve into the membrane material and diffuse to the permeate side, creating a concentrated vapor stream for recovery.
Key Performance Parameters
WHSH-series VRUs utilize membrane modules with 4-20 m³/h processing capacity. The system maintains NMHC emissions below 10g/m³, ensuring compliance with environmental regulations. Operating temperature ranges from -40°C to 50°C, suitable for various climate conditions.
Advantages Over Traditional Methods
Compared to absorption or adsorption methods, membrane separation offers continuous operation without chemical consumption. The technology requires minimal maintenance, has no moving parts in the separation unit, and provides consistent performance throughout its service life of 5-8 years.
System Integration
The membrane module works in conjunction with compression and condensation stages. Compressed vapors enter the membrane unit at optimized pressure and temperature conditions. The permeate stream returns to fuel storage, while the retentate (clean air) vents to atmosphere meeting emission standards.