High-Efficiency Volatile Organic Compound (VOC) Capture & Resource Recovery Solution

1. Executive Summary & Background

During oil and gas production, storage, transportation, loading, and unloading operations, light hydrocarbons continuously volatilize into the atmosphere. The unmanaged release of these hydrocarbon vapors leads to:

Significant Product Loss: Loss of high-value light fuel components.
Environmental Pollution: Emission of dangerous Volatile Organic Compounds (VOCs) contributing to smog, ozone creation, and air quality degradation.
Safety & Health Hazards: Flammability risks and toxic health exposure to field operators and surrounding communities.

Our Vapor Recovery System is engineered to effectively isolate, recover, and liquefy VOCs from air-gas mixtures under controlled temperature and pressure conditions through physical separation techniques—primarily Adsorption + Absorption and Condensation + Absorption.

2. Industry Necessity & Compliance

Driven by strict environmental regulations and global carbon-neutrality initiatives, environmental authorities have mandated the installation of high-efficiency Vapor Recovery Units across bulk liquid storage tanks, truck loading racks, rail loading facilities, and marine terminals. Installing our VRU system ensures 100% environmental compliance, eliminates open emissions, and converts lost vapors back into usable fuel—delivering both environmental sustainability and measurable financial ROI.

3. Working Principle (Adsorption + Absorption Process)

Selective Adsorption: Vapor-laden air passes through specialized activated carbon beds. The activated carbon selectively adsorbs volatile organic molecules (VOCs) while clean, compliant air is safely vented into the atmosphere.
Vacuum Regeneration (Desorption): Once saturated, a state-of-the-art dry vacuum pump pulls a deep vacuum on the bed to desorb the captured hydrocarbon vapors, restoring the carbon’s adsorption capacity.
Absorption & Recovery: The rich, concentrated VOC vapor is directed to an absorption column. Using low-grade gasoline, light diesel, or kerosene from the tank farm as the liquid absorbent, the hydrocarbon gas is re-absorbed and safely returned to storage.

4. Key System Configurations

Each VRU system is fully automated and built with industrial-grade components:

Dual Parallel Adsorption Tanks: Configured for alternating cycles (one adsorbing while the other regenerates) to guarantee uninterrupted 24/7 continuous operation.
Imported Dry Vacuum Pump Unit: High-vacuum capability ensuring complete bed regeneration without oil contamination.
Absorption Tower & Liquid Distributor: Designed for maximum gas-liquid contact efficiency.
Circulating Oil Pump System: Delivers precise flow control for the absorbent liquid.
Integrated PLC Control System: Fully automated operation with intuitive HMI touchscreens, real-time safety interlocks, and remote monitoring capabilities.

5. Technical Advantages & Product Highlights

Superior Carbon Adsorbent: Utilizes custom-grade activated carbon featuring high adsorption capacity, high mechanical hardness, and exceptionally low pressure drop. The material maintains high structural integrity and operational stability over long service cycles.
Energy-Efficient Vacuum Regeneration: Equipped with an imported dry vacuum pump paired with a Variable Frequency Drive (VFD). This setup delivers:
- Deeper vacuum levels for thorough carbon regeneration.
- Substantially lower power consumption and reduced mechanical wear.
- Extended adsorbent lifespan and guaranteed long-term technical parameter stability.
Tailor-Made Engineering: Custom-engineered according to client flow rates, gas composition, temperature, pressure, and site footprint requirements (no fixed standard constraints).

6. Applications & Usage Scenarios

Our Vapor Recovery Systems are widely deployed across the oil, gas, and petrochemical sectors, including:

Refineries & Fuel Storage Terminals: VOC recovery from gasoline, diesel, and crude oil tank truck, railcar, and marine loading/unloading facilities.
Oilfield Associated Gas Recovery: Capture and utilization of flared or vented associated petroleum gas (APG).
Chemical Gas Separation & Recovery: Efficient recovery and separation of volatile chemical gases including Benzene series (BTEX), Methanol, Solvents, and Alcohols.
Chemical Process Gas Management: Concentration control, gas separation, and loop recovery in organic chemical manufacturing lines.
Ultra-Low Emission Zone Control: Tailored solutions meeting the most stringent local and international environmental VOC emission standards (e.g., emission concentrations $<20\text{ g/m}^3$ or stricter).

Technical Specifications Summary

Capacity: Fully customizable based on flow rate (m³/h) and VOC inlet concentration.
Process Method: Adsorption + Absorption / Condensation + Absorption / Hybrid Membrane processes available.
Control Level: Fully automatic PLC control (Ex-d / Ex-p explosion-proof compliant).

Vapor Recovery Unit in China

Advanced Vapor Recovery Unit (VRU) / VOCs Recovery System