Oil and gas recovery is a new technology of energy saving and environmental protection. It uses oil and gas recovery technology to recover oil and gas discharged during storage, transportation and loading and unloading, to prevent air pollution caused by oil and gas volatilization, eliminate safety hazards, and reduce economic losses by improving the utilization rate of energy, thus obtaining objective benefit return. The common methods are adsorption, condensation and membrane separation.
1. adsorption method
The separation of oil and air is realized by using the adsorption capacity of activated carbon, silica gel or active fiber on oil-gas / air mixture. Oil and gas are adsorbed on the adsorbent surface through adsorbents such as activated carbon, and then they are desorption by pressure reduction or steam desorption. The enriched oil and gas are pumped to the oil tank by vacuum pump or liquefied by other methods; while the adsorption force of adsorbents such as activated carbon to air is very small, and the exhaust gas not absorbed is discharged through exhaust pipe.
Advantages: adsorption method can achieve high treatment efficiency, low emission concentration, and can achieve a very low value.
Disadvantages: triphenyl is easy to inactivate activated carbon, and there is a secondary pollution problem after deactivation of activated carbon. The adsorption capacity of domestic activated carbon is only about 7%, and the life is not long, and it can be used for only 2 years.
