Manufacturer of three oil and gas recovery devices at gas stations

The technical routes for the three stage oil and gas recovery at gas stations mainly include condensation, adsorption, absorption, membrane separation, and their combined processes. These methods each have their own focus, and when selecting, the main consideration is the on-site working conditions and operational objectives.

The condensation method utilizes the difference in saturated vapor pressure of oil and gas at different temperatures, and liquefies and recovers the oil and gas through step-by-step cooling. The recovered oil is pure and consumable free, but the lower the temperature, the higher the energy consumption, and the higher the operating cost when used alone.

Adsorption method relies onactivated charcoalBy using materials to adsorb oil and gas molecules from the mixed gas, and then recovering them through vacuum or steam desorption, the exhaust concentration can be treated to a lower level. However, in practical applications, activated carbon adsorption releases heat, poses a risk of spontaneous combustion, and requires regular replacement of saturated carbon, which is also a hazardous waste.

The membrane separation method utilizes the difference in permeation rates of different gases by polymer membranes - oil and gas molecules are intercepted, while air molecules are directly discharged through them, resulting in high separation efficiency, low energy consumption, and no secondary pollution. But using membrane separation alone can only convert oil and gas into gaseous form for concentration, and cannot be directly liquefied.

Combination technology is the mainstream choice in the industry. The condensation method can directly liquefy and recover most of the oil and gas, and the residual tail gas is further processed through membrane separation or adsorption processes. Multiple units are connected in series to achieve a high overall recovery rate.

    Wohong PetrochemicalThe plan adopts a combination route of "condensation+membrane separation", which combines the design of the condensation unit and membrane separation unit. The membrane separation unit further processes the tail gas that has not been liquefied after condensation, forming a concentrated gas that is sent back to the front end for circulation treatment, and the air is discharged in compliance with standards. The overall recovery rate can reach a high level, and the emission concentration can stably meet the national standard requirements. The equipment adopts a lever mounted integration, which automatically starts and stops according to the pressure of the oil storage tank, without the need for manual supervision.