Skid‑Mounted VRU Vapor Recovery System for Fuel Station Renovation | Vohon Petrochemical Supplier

Skid‑mounted VRU vapor recovery system is purpose‑built for the renovation and upgrading of existing fuel stations, addressing gasoline vapor emissions generated during tank‑truck offloading, vehicle refueling and storage tank breathing. Retrofitting projects are often constrained by existing pipeline layout, limited site area and old‑site safety specifications. Gas station vapor shows typical intermittent and pulse‑type features: large‑volume vapor surges occur at tanker unloading, while refueling produces continuous low‑concentration vapor discharge. Vapor flow rate and concentration vary significantly under different operating scenarios. Entrained liquid oil droplets and condensed water may exist inside the collected vapor. Light hydrocarbon components are highly flammable, so the skid‑mounted VRU system places strict requirements on compact footprint, explosion‑proof performance, liquid entrainment resistance, adaptability to on‑site retrofitting conditions and long‑term stable operation.

Traditional vapor treatment technologies have obvious limitations when applied to fuel station renovation projects. Direct incineration destroys recyclable light hydrocarbon resources and generates combustion by‑products, requiring additional auxiliary facilities and raising overall investment and operating costs. Activated carbon adsorption relies on pollutant transfer instead of resource recovery. Under frequent pulse vapor impact, adsorbent media tends to saturate and degrade rapidly. Carried‑over liquid gasoline can cause carbon bed caking, bringing heat‑accumulation safety risks. Frequent consumable replacement creates large volumes of hazardous waste and increases long‑term operating costs for renovated stations. Single‑stage condensation equipment only works well under peak high‑concentration vapor conditions. When vapor concentration declines, hydrocarbon components cannot be fully liquefied, resulting in non‑compliant tail‑gas emission. Single‑process solutions cannot satisfy full‑cycle stable treatment for complex variable working conditions of retrofitted fuel stations.

This skid‑mounted VRU adopts compression‑condensation‑membrane coupling full‑physical process, with no combustion and no chemical reaction throughout the treatment, which is highly suitable for fuel‑station renovation scenarios. Gasoline vapor collected from tank‑truck unloading openings, refueling pipelines and storage tank breathing valves is delivered via existing closed vapor‑collection pipelines. A buffer unit is equipped to stabilize sharp fluctuations of gas pressure and flow caused by retrofitted pipe network conditions.

Incoming vapor first enters multi‑stage pretreatment modules to remove entrained oil droplets and free moisture layer by layer. The hierarchical interception structure prevents liquid carry‑over from entering compressors, heat exchangers and membrane assemblies, avoiding fouling, blockage and irreversible contamination of core components, protecting precision parts and extending the whole‑system service life.

After pretreatment, vapor flows into the compression unit to raise hydrocarbon partial pressure and optimize gas‑liquid equilibrium for liquefaction. The multi‑stage gradient condensation module cools mixed vapor according to boiling‑point differences of light‑hydrocarbon fractions, liquefying and separating most gasoline components to complete primary vapor recovery.

Residual uncondensed hydrocarbon components in tail gas are sent to organic membrane separation modules. Utilizing the permeability difference between hydrocarbon molecules and air molecules, organic vapor is highly concentrated. Qualified tail gas is discharged up to standard. High‑concentration hydrocarbon‑rich gas from the membrane side circulates back to the compressor inlet to form a closed‑loop circulation, further boosting the comprehensive recovery efficiency of gasoline vapor. Recovered liquid gasoline can be sent back to underground storage tanks for reuse, reducing resource loss from volatilization and creating economic benefits for renovated fuel stations.

Integrated skid‑mounted design completes factory‑side assembly, explosion‑proof inspection and pressure testing before delivery. Compact overall dimensions adapt to the limited available space of old‑station renovation. On‑site construction workload is greatly reduced, connection can be implemented based on original vapor‑collection pipelines, minimizing site modification scope and shortening project implementation cycle with little disruption to daily fuel‑station operations.

All motors, sensors and electrical instruments comply with explosion‑proof standards for petrochemical fuel‑station environments. Pipelines, valves and heat‑exchange parts in contact with oil‑gas medium adopt high‑performance corrosion‑resistant materials. Complete interlock protection of over‑pressure, over‑temperature and flammable‑gas detection is configured, together with emergency vent bypass, to cope with instantaneous high‑concentration vapor pulse during tanker unloading and eliminate fire‑explosion hazards. The intelligent frequency‑conversion control system dynamically adjusts operating load according to real‑time vapor flow and concentration, adapting to intermittent vapor‑emission characteristics of fuel stations, avoiding no‑load operation and lowering overall energy consumption.

Customized design is available according to actual vapor parameters, original pipe‑network status, site space and renovation constraints of each fuel station, with sufficient working margin reserved. As a reliable supplier, Vohon Petrochemical delivers one‑stop services including site condition survey, retrofitting‑oriented process design, equipment manufacturing, on‑site installation and commissioning, operator training and long‑term after‑sales maintenance. Supported by standardized manufacturing and construction management, this skid‑mounted VRU vapor recovery system achieves compliant gasoline‑vapor governance and resource recovery for fuel‑station renovation projects.