Method for comprehensive oil gas recovery

Abstract

The present invention discloses a method for comprehensive oil gas recovery, including an oil gas absorption process and a rich absorbent regeneration process. Commercial diesel oil is used as the oil gas absorbent for the oil gas absorption process. The temperature of the absorbent entering an absorption tower is -20 to 20 DEG C. The oil gas is compressed to 0.2-1MPa via a liquid ring compressor. The liquid ring compressor-pressurized oil gas exchanges heat with the rich absorbent discharged from the absorption tower for cooling. Oil gas condensed to be liquid phase is recovered, while un-condensed oil gas is fed into the absorption tower and in countercurrent contact with the absorbent in the absorption tower. The rich absorbent absorbed the oil gas is discharged from the absorption tower; and is desorbed after being heated via heat exchange. Commercial diesel oil is used as operating fluid for the liquid ring compressor, and the operating fluid is once-through. The operating fluid discharged from the liquid ring compressor, together with the rich absorbent discharged from the absorption tower, is desorbed by means of appropriate vacuum, and then is fed into a commercial diesel tank. Compared with the prior art, the method of the present invention has advantages of a reasonable technological process, high oil gas recovery efficiency, low investment in equipment and operating costs, etc.

Description

technical field [0001] The invention provides a comprehensive oil gas recovery method, in particular a gasoline or light hydrocarbon oil gas recovery method using commercial diesel oil as an absorbent. Background technique [0002] In the process of crude oil extraction, transportation, storage, transfer, processing and crude oil processing products (gasoline, kerosene, diesel oil, etc.) , which generally contain air and other components) escape into the atmosphere, and in some chemical solvents such as benzene, toluene, xylene production workshops, paints and other organic solvents, there are also light hydrocarbons with similar properties and high volatility point. [0003] On the one hand, the oil and gas dissipated into the air waste a lot of energy, causing huge economic losses, and on the other hand, reduce the quality of oil products. Moreover, since the explosion limit of oil and gas is 1%~6% (volume), the concentration of oil and gas around the escaped oil and gas...

AI Technical Summary

Problems solved by technology

[0006] For the oil and gas absorption process using special absorbents, there is generally a regeneration process of the absorbent after absorbing oil and gas (absorbents after absorbing oil and gas are called rich absorbents); Diesel oil can not be regenerated, and can be further processed in downstream processing procedures, such as hydrotreating or entering a fractionation tower. Since the absorbed oil and gas are also hydrocarbons, it does not affect the normal operation of downstream processing, but some occasions do not have the source of gas oil. , such as gasoline transportation, sales and other enterprises, so the scope of application of gas oil as the absorbent has certain limitations; for the absorption process using commercial diesel as the absorbent, since the absorbed oil gas belongs to the low-carbon hydrocarbons in gasoline , the rich absorbent is highly volatile, and if the rich absorbent is not regenerated, the indicators such as the flash point and distillation range of the diesel oil will be unqualified, but to completely desorb the oil gas entering the diesel oil, a higher degree of Vacuum degree and higher feed temperature, regeneration equipment investment and operating costs are higher

Images