Explosion‑Proof VRU Vapor Recovery Equipment with Leakage Monitoring | Vohon Petrochemical Producer

Explosion‑proof VRU vapor recovery equipment with leakage monitoring is specially developed for gasoline vapor control at fuel stations. It targets vapor emissions produced during tank‑truck unloading, vehicle refueling and storage tank breathing processes. Besides conventional vapor recovery functions, the unit integrates real‑time leakage monitoring modules for pipelines and key components. Gas station vapor emissions feature intermittent and pulse‑discharge characteristics. Massive vapor surges occur when tank trucks unload oil, while refueling operations generate continuous low‑concentration vapor output. Vapor flow and concentration fluctuate greatly under varied working conditions. Collected vapor may carry entrained gasoline droplets and condensed moisture. Light‑hydrocarbon vapor is highly flammable, which raises strict requirements for explosion‑proof grade, liquid entrainment removal, on‑line leakage monitoring capability, wide‑condition adaptability and long‑term reliable operation.

Traditional vapor disposal technologies have prominent drawbacks for fuel‑station scenarios. Direct incineration burns recyclable light‑hydrocarbon resources and produces harmful combustion by‑products, requiring extra auxiliary facilities and increasing overall investment and operating costs. Activated carbon adsorption only achieves pollutant transfer rather than resource recovery. Under repeated pulse vapor impact, adsorbent saturates and degrades rapidly. Entrained liquid gasoline causes carbon bed caking and brings heat‑accumulation safety risks. Frequent replacement of consumables generates large quantities of hazardous waste and increases daily operational burdens. Single‑stage condensation equipment delivers satisfactory performance only under high‑concentration peak conditions. When vapor concentration drops, hydrocarbon components cannot be fully liquefied, resulting in excessive tail‑gas emission. Single‑process hardware cannot meet full‑cycle stable treatment for complex variable working conditions of fuel stations.

Adopting compression‑condensation‑membrane coupling full‑physical process without combustion or chemical reaction, this explosion‑proof VRU equipment is well‑suited for fuel‑station vapor governance. Gasoline vapor collected from tank‑truck unloading ports, refueling pipelines and storage‑tank breathing valves flows through closed gathering pipelines. A buffer unit is installed to stabilize drastic fluctuations of gas pressure and flow rate. Real‑time leakage monitoring sensors are arranged on key pipeline joints, valve groups and module interfaces to detect abnormal vapor escape promptly and output alarm signals.

Incoming vapor first passes through multi‑stage pretreatment units 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 parts, protecting precision components and extending the service life of the whole equipment.

After pretreatment, vapor enters 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. Most gasoline components are liquefied and separated to complete primary vapor recovery work.

Residual uncondensed hydrocarbon components in tail gas go into organic membrane separation modules. Based on permeability differences between hydrocarbon molecules and air molecules, organic vapor is highly enriched. Treated tail gas meets discharge standards and is released. High‑concentration hydrocarbon‑rich gas from the membrane side circulates back to the compressor inlet to form a closed‑loop circulation, further improving the comprehensive recovery efficiency of gasoline vapor. Recovered liquid gasoline can be returned to underground storage tanks for reuse, cutting resource loss caused by volatilization and bringing tangible economic benefits to fuel stations.

The unit adopts integrated skid‑mounted structure with factory‑completed assembly, explosion‑proof inspection and pressure testing before delivery. Compact layout reduces on‑site construction workload. It can connect with existing station vapor collection pipelines, narrow reconstruction scope and shorten project cycle without disturbing daily refueling business.

All motors, transmitters and electrical instruments comply with petrochemical explosion‑proof specifications. Pipelines, valves and heat‑exchange components contacting oil‑gas medium adopt high‑performance corrosion‑resistant materials. Complete interlock protection systems for over‑pressure, over‑temperature and flammable‑gas detection are equipped, together with emergency vent bypass, to handle instantaneous high‑concentration vapor pulse during tanker unloading and eliminate fire and explosion hazards. Supported by the built‑in leakage monitoring system, abnormal leakage points can be located quickly for timely maintenance. The intelligent frequency‑conversion control system dynamically adjusts operating load according to real‑time vapor flow and concentration, adapts to intermittent vapor‑emission features of fuel stations, avoids no‑load operation and optimizes overall energy consumption.

Customized design is available based on practical vapor parameters, pipeline layout, site space and monitoring requirements of each fuel station, with sufficient working margin reserved. As a professional producer, Vohon Petrochemical provides one‑stop services including site survey, process scheme design, equipment manufacturing, on‑site installation and commissioning, operator training and long‑term after‑sales support. With standardized manufacturing and construction management, this explosion‑proof VRU vapor recovery equipment realizes compliant gasoline‑vapor treatment, resource recovery and real‑time leakage risk warning for fuel stations.