VRU vapor recovery equipment with online monitoring is dedicated to hydrocarbon vapor abatement for petrol station storage and dispensing systems. Vapor‑air mixtures are generated during tanker unloading, tank breathing and fuel refueling processes. The actual working condition presents obvious intermittent features. Vapor flow and concentration rise sharply during oil unloading operations and drop to low levels in standby periods. Incoming gas carries entrained gasoline mist, condensed droplets and tiny solid impurities. These contaminants may cause fouling and blockage of core components. The equipment is required to handle variable‑load flammable vapor continuously, meet local emission limits, and achieve recyclable liquid fuel output. Integrated online monitoring modules track key operating parameters in real‑time, providing data basis for operation adjustment and abnormal early warning.
Conventional vapor disposal technologies have notable drawbacks for petrol station scenarios. Direct incineration can purify exhaust gas but burns recoverable gasoline components, leading to resource waste. Combustion of hydrocarbon‑laden gas may generate harmful by‑products, requiring extra flue‑gas treatment units and bringing high capital and operating expenses. Single activated carbon adsorption only transfers pollutants instead of realizing resource recovery. Faced with fluctuating vapor concentration and oil mist contamination, adsorbent media tends to saturate prematurely and suffer penetration failure. Frequent shutdown for material replacement produces large amounts of hazardous waste and increases long‑term cost burden. Simple condensation technology is restricted by hydrocarbon partial pressure. It delivers decent performance under high‑concentration intake, yet recovery efficiency declines significantly when vapor concentration falls, and stable treatment effect cannot be maintained under variable‑load conditions.
Compression‑condensation‑membrane separation is a full‑physical process without combustion or chemical reaction, which fits petrol station vapor recovery demands perfectly. Raw vapor passes through pre‑treatment units equipped with multi‑stage filtration and demisting structures to remove oil mist, free droplets and particulate impurities, protecting downstream compressors, condensers and membrane elements from contamination. Purified vapor goes into compression section to lift hydrocarbon partial pressure and create favorable liquefaction conditions. Multi‑stage gradient condensation modules separate most hydrocarbon substances into liquid phase according to different boiling points, completing primary fuel recovery.
The residual gas stream after condensation still contains recyclable hydrocarbons and is delivered to organic membrane separation assemblies. Utilizing selective permeability differences between hydrocarbon molecules and air, organic components are highly concentrated. Purified gas is discharged compliantly, while enriched high‑concentration vapor stream circulates back to compressor inlet for cyclic re‑processing inside the system. Closed‑loop circulation maximizes fuel recovery yield. Recovered liquid gasoline is processed by sedimentation and filtration. After qualification check, it can be returned to underground storage tanks, reusing volatilized fuel resources, cutting VOCs discharge and reducing comprehensive expenditure on raw material supplement and waste disposal.
Online monitoring system keeps continuous track of critical indexes including intake flow, vapor concentration, system pressure, operating temperature and exhaust emission status. Collected data can be displayed locally. Abnormal parameter deviation will trigger early‑warning signals so that operators can locate hidden troubles before performance deterioration. Equipment structural configuration should adapt to real‑site conditions. Medium‑contact pipelines, valves and heat exchange assemblies adopt corrosion‑resistant materials to resist erosion from gasoline fractions. Complete interlock protection against over‑pressure, over‑temperature and combustible gas leakage is configured to mitigate safety risks of flammable vapor. Frequency‑conversion control adjusts operating load dynamically according to real‑time vapor variation, matching intermittent vapor generation features and optimizing overall energy consumption. Graded pre‑treatment effectively protects precision core parts and extends service cycle. Engineering design shall be based on field‑measured data such as vapor flow, component proportion, concentration range and impurity content instead of blind application of general models. Reasonable skid layout, standardized installation and regular inspection support long‑term reliable operation of vapor recovery system, satisfying environmental compliance and resource‑recycling goals of petrol station storage and distribution facilities.