High‑efficiency three‑stage oil‑gas recovery plant serves as the terminal processing hardware matching Stage I and Stage II vapor recovery systems for fuel filling sites. It handles hydrocarbon vapors generated by tank breathing, temperature variation and pressure fluctuation inside underground fuel storage tanks. When tank pressure exceeds preset trigger threshold, the unit starts automatically to trap surplus gasoline vapors, cut fuel loss, lower VOC emissions, mitigate flammable vapor accumulation risks and help filling stations satisfy local environmental regulatory requirements.
Conventional treatment solutions have obvious defects. Direct venting causes massive fuel waste and potential fire hazards. Single activated‑carbon adsorption suffers from frequent saturation under variable vapor loads, generates large‑volume hazardous waste and demands frequent consumable replacement. Simple condensation technology cannot sustain stable recovery efficiency when tank‑breathing vapor concentration fluctuates continuously.
Adopting compression‑condensation‑membrane coupling all‑physical workflow, this three‑stage plant realizes vapor liquefaction and recycling without combustion or chemical reaction. Tank‑breathing vapors are gathered via closed pipelines and delivered to buffer assembly to stabilize pressure disturbance caused by ambient temperature shift. Multi‑stage pre‑treatment removes liquid droplets and fine aerosols, protecting compressors, heat exchangers and membrane elements from fouling, corrosion and blockage. After compression for partial‑pressure promotion, most hydrocarbon components liquefy into gasoline through gradient multi‑stage cooling. Remaining low‑concentration vapors pass through membrane separation module for selective enrichment. Purified air meets emission standards, while concentrated vapor stream circulates back for re‑processing to boost overall recovery performance. Recovered liquid gasoline flows back to underground storage tanks for direct reuse and creates tangible economic returns for station operators.
The whole plant complies with ATEX explosion‑proof specifications for hazardous fuel‑handling zones. It is equipped with over‑temperature, over‑pressure, combustible‑gas detection interlock and emergency vent bypass to cope with abnormal working conditions. Intelligent variable‑frequency control adjusts operating status according to real‑time tank pressure and vapor load, supporting auto start‑stop and long‑term unattended operation. Compact layout saves floor occupation, suitable for new‑build filling‑station construction and old‑site renovation upgrade. Customization on processing capacity and internal configuration is available to match filling sites of different scales. It delivers a dependable solution for global fuel sites to achieve emission compliance, fuel recycling and on‑site safety management simultaneously.