Three-stage oil and gas recovery device

Brief description:The Wohong three-stage oil and gas recovery device is a complete set of terminal oil and gas treatment system supporting the oil storage and transportation process. It is mainly used to treat the oil and gas generated by the breathing of oil storage tanks, making up for the shortcomings of primary unloading oil and gas recovery and secondary refueling oil and gas recovery, and controlling the temperature changes of storage tanks

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2026-10-10

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Detailed introduction

The Wohong three-stage oil and gas recovery device is a complete set of terminal oil and gas treatment system supporting the oil storage and transportation process. It is mainly used to treat the oil and gas generated by the breathing of oil storage tanks, making up for the shortcomings of primary unloading oil and gas recovery and secondary refueling oil and gas recovery, and controlling the overflow emission of oil and gas caused by temperature changes and pressure fluctuations in storage tanks. The entire device uses pressure sensing signals as the triggering condition for start-stop. When the internal pressure of the oil storage tank rises to a set threshold, the device automatically starts, extracts the mixed gas of oil and gas from the tank for separation and recovery, and discharges the treated clean air after meeting the standards. The liquefied recovered oil flows back to the oil storage tank.

The device can adopt a condensation membrane coupling process, combining the condensation unit with an organic gas vapor membrane module as the core processing unit. The oil-gas mixture first enters the condensation module, where most of the hydrocarbon gases are liquefied through low-temperature cooling, resulting in liquid oil products for recovery. The residual low-concentration oil-gas after condensation treatment is sent to the membrane separation unit. Oil-gas molecules preferentially permeate through the polymer oil-gas recovery membrane based on the vapor permeation principle, enriching into high-concentration oil-gas on the vacuum side, which is then sent back to the condensation unit for liquefaction and recovery; air components are difficult to penetrate the membrane and are discharged from the retentate side. The membrane module is made of specialized polymer materials resistant to hydrocarbon swelling, capable of maintaining stable permeation flux and separation selectivity in long-term contact with gasoline and diesel hydrocarbon vapors, and adapting to the intermittent exhaust conditions of storage tanks. The entire membrane module adopts a standardized packaging structure, facilitating convenient disassembly and maintenance. The number of membrane elements can be flexibly adjusted according to the tank capacity and oil-gas production volume.

Compared to traditional adsorption-based tertiary oil and gas recovery equipment, the condensation membrane coupling process eliminates the need for frequent replacement of activated carbon adsorption consumables, does not generate a large amount of hazardous solid waste, and avoids the safety hazards of overheating and spontaneous combustion inherent in the activated carbon adsorption process, achieving a higher level of system automation. The device is equipped with a complete pre-treatment unit to remove liquid droplets and impurity particles carried by the oil and gas mixture, preventing pollutants from adhering to the membrane surface and causing membrane pore blockage, thereby reducing the degradation rate of membrane components and extending their service life. The system is equipped with an intelligent control system that monitors parameters such as tank pressure, inlet temperature, and oil and gas concentration in real time, automatically adjusts vacuum degree and refrigeration load, and shuts down the equipment automatically after the pressure falls back to a safe range, reducing operational energy consumption.

The three-stage oil and gas recovery device is primarily used for managing oil and gas emissions from underground storage tanks at gas stations. It can also be adapted to scenarios involving oil depot tanks and chemical oil product storage tanks for breathing gas recovery. The device adopts an explosion-proof design, meeting the safety standards of the petrochemical industry. While reducing VOCs emissions and eliminating tank area odors, the recovered liquid oil products can be directly reused, combining environmental protection with resource recovery. This device addresses the issue of tank breathing losses, perfecting the closed-loop management and control of oil and gas throughout the entire oil loading, unloading, and storage process. It meets relevant standards for atmospheric pollutant emissions and serves as the core equipment for deep VOCs treatment in the oil storage and transportation industry.

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