Method for reclaiming and treating oil gas

Abstract

The invention discloses a method for reclaiming and processing oil gas, the method can lead oil gas mixture to firstly enter from the lower portion of an absorbing tower after pre-cooling through a precooler through the steps of absorbing, separating membrane, storing heat and oxygenizing, and gas reversely contacts with lean oil which is sprayed in the absorbing tower and absorbent in the process of ascending to do absorption treatment, oil product which is absorbed is directly recovered, oil gas mixture which is not absorbed gets into a membrane separator through the top of the absorbing tower, and the oil gas is separated out through permeating membrane under the action of bilateral pressure differences of membrane, which gets into an oil gas inlet of the precooler to do a next absorption cycle, air which can not permeate membrane and oil gas with little amount get into a heat-storage oxidation device, and end gas which is oxidized is emptied. The method which is utilized to reclaim oil gas has high recovery ratio, the end gas which is discharged is environmental protection, and the processing process does not utilize power equipment, which is safe and reliable. In addition, since active solid such as activated charcoal and the like are not used, therefore secondary pollution is avoided. The internal portion of the invention achieves self circulation of heat. The method for reclaiming and processing oil gas saves production cost and saves energy resource.

Description

technical field [0001] The invention relates to a combined oil and gas recovery and treatment process, in particular to a combined oil and gas recovery and treatment process in refineries, oil depots or gas stations. Background technique [0002] The operation of petroleum storage and transportation system (refinery, oil depot, gas station) is inevitably accompanied by the emission control of hydrocarbon gas. In the past ten years, with the improvement of environmental protection requirements, the use of oil and gas recovery methods to control the emission concentration of hydrocarbon-containing mixed gas and reduce oil evaporation loss has received widespread attention at home and abroad. [0003] The existing oil and gas recovery method is to use pressurized heat removal method, absorption method, and adsorption method in combination according to needs to form a single-stage or multi-stage treatment to complete the safe recovery of oil and gas. For example, the application...

AI Technical Summary

Problems solved by technology

[0004] Using the above methods for oil and gas recovery, although a certain recovery effect can be achieved, there are still a series of problems, such as: the adsorbent after the adsorption method causes secondary pollution at the same time, which does not meet the environmental protection requirements

The pressurized heat removal method often involves the problem of multi-stage condensation, and the investment cost is very high

Moreover, in the existing method, a small amount of oil-gas mixed gas is discharged into the air after oil-gas multi-stage recovery treatment, causing air pollution, which is not conducive to environmental protection, and can not meet the new requirement of less than 150mg / m 3 emission standard requirements

In addition, the use of power equipment such as compressors in the process of oil and gas recovery is likely to bring potential safety hazards

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