Gas station oil and gas recovery upgrade path: from secondary recovery to tertiary recovery

The gas station oil and gas recovery system is divided into two stages: secondary oil and gas recovery to solve the oil and gas recovery during refueling and unloading processes, and tertiary oil and gas recovery to treat the oil and gas emitted from the oil storage tank. With the increasingly strict environmental requirements, more and more gas stations are launching three oil and gas recovery renovations on the basis of completing secondary recycling. Understanding the relationship between these two levels of systems is a prerequisite for planning the upgrade path.

What is the solution for secondary oil and gas recovery

The secondary oil and gas recovery system covers both the refueling machine and the unloading process: during refueling, the oil and gas in the fuel tank are recovered through an oil and gas recovery type refueling gun, and during unloading, the oil and gas replaced in the tank truck are sent back to the tank through an oil and gas recovery pipeline. Secondary recycling solves the problem of oil and gas leakage in the two main processes of refueling and unloading.

Why do we need three rounds of oil and gas recovery

During the storage process of the oil storage tank, the oil and gas inside the tank will be discharged through the breathing valve due to the temperature difference between day and night and the disturbance of oil unloading. This part of the emissions may seem small, but when accumulated, it cannot be ignored. The three-stage oil and gas recovery device is installed at the breathing valve to process the discharged oil and gas: compressor pressurization, air cooling condensation, membrane separation and concentration, to recover the oil and gas back into liquid oil products, and discharge the exhaust gas after meeting the standards. The three-level system together forms a complete closed-loop system for oil and gas recovery.

How to implement upgrade and renovation

The three rounds of oil and gas recovery renovation mainly use pry mounted equipment, which occupies a small area and is installed quickly, making it suitable for operating gas stations. Before the renovation, complete the inspection and maintenance of the secondary oil and gas recovery system to ensure that the front-end system is in good working condition; Determine the processing air volume configuration of the three recovery equipment based on the oil tank volume and unloading frequency. The WHSH series from Wohong covers a processing range of 4-20 cubic meters per hour and can be matched with stations of different scales.

Benefits after renovation

After completing the third level oil and gas recovery, the gas station not only meets the requirements of environmental emission supervision, but also reduces the evaporation loss of oil products. The liquid oil products recovered from oil and gas recovery can be reused in tanks. For stations with high oil turnover, the economic value of recycling is more significant. The clear upgrade path and mature equipment are routine actions for environmental compliance at current gas stations.