Skid‑Mounted Tertiary Oil‑Gas Recovery Unit for Filling Station｜Vohon Petrochemical
Skid‑mounted tertiary oil‑gas recovery unit is specially developed for oil‑gas emission control of filling stations, focusing on tank breathing volatile gas generated during oil unloading, tank storage and temperature fluctuation. A large amount of gasoline vapor escapes from storage tank breathing holes, which not only brings about fuel economic loss, but also creates flammable mixed gas and causes atmospheric pollution. Adopting physical compression‑condensation coupled membrane separation process, the skid‑mounted unit recovers hydrocarbon components by liquefaction rather than incineration, realizing both emission compliance and resource reuse.
Oil‑gas from tank breathing ports is collected by closed pipelines and fed into the skid system. Built‑in buffer assembly stabilizes fluctuating pressure and flow caused by intermittent tank breathing. The pre‑treatment segment removes entrained liquid droplets and particulate impurities, preventing liquid carry‑over from damaging compressors, condensers and membrane elements, and extending service life of core components.
The oil‑gas mixture goes through compression process to raise hydrocarbon partial pressure, then enters multi‑stage condensation modules. Most gasoline components are liquefied under cooling conditions. The recovered liquid gasoline can be returned directly to underground storage tanks. Uncondensed mixed gas flows into membrane separation unit. Relying on polymer membrane selective permeation effect, hydrocarbon vapor is concentrated on the permeation side, while purified gas is discharged up to standard. The concentrated high‑concentration oil‑gas stream circulates back to the front‑end compression section for cyclic recovery to promote overall recovery efficiency.
The complete skid‑mounted assembly finishes pipeline connection, instrument installation and internal debugging in factory, realizing integrated delivery. All electrical parts meet explosion‑proof requirements for petrochemical hazardous zones. Comprehensive safety interlock functions cover over‑pressure, over‑temperature and abnormal liquid level, with emergency vent bypass reserved for unexpected working conditions. Local touch screen monitors real‑time pressure, temperature and operating parameters, supporting signal docking with filling station central control system.
Compact skid layout occupies less floor space, simplifying on‑site installation and shortening construction cycle. It is applicable for new filling station projects as well as old‑station renovation and upgrading. Without complicated on‑site assembly work, the unit can be put into operation after connecting oil‑gas pipelines and power supply. It cuts gasoline loss from tank breathing emission, helps filling stations meet environmental regulatory demands, and delivers stable, low‑maintenance oil‑gas recovery solutions for fuel retail sites.