Oil gas recovery method

Abstract

The invention discloses an oil gas recovery method, and belongs to the technical fields of energy utilization, environmental safety, environmental protection and the like. By adopting multi-stage condensation, inter-stage pressurization and low-temperature tail gas cold energy recovery, the oil gas recovery method realizes the recovery of volatile oil gas. The method has high recovery efficiency, and effectively saves energy; the used system has the advantages of low cost, simple structure, long service life and easy operation; and the method can be applied to the recovery of volatile oil gas with low carbon content, such as crude oil and gasoline on occasions such as gas stations, oil depots and oil fields.

Description

technical field [0001] The invention relates to a method for recovering volatile oil, which can be applied to the recovery of hydrocarbon-containing volatile oil and gas such as crude oil and gasoline in gas stations, oil depots and oil fields, and belongs to the technical fields of energy utilization, environmental safety and the like. Background technique [0002] VOCs with low carbon content present in crude oil and gasoline are highly volatile. The evaporation loss of oil products is a waste of energy, and directly discharging them into the atmosphere will endanger the health of the surrounding staff and nearby residents, and it will easily form photochemical smog if it diffuses into the air for a long time. Since the oil-gas mixture has exceeded the lower explosion limit, it may pose an explosive threat to the surrounding environment, which is not conducive to environmental protection. Therefore, the recovery of volatile oil vapor is a necessary link no matter in the p...

AI Technical Summary

Problems solved by technology

The problem is: if the condensing temperature is too low, the power consumption is too large, the low-temperature compressor is expensive, and the return on investment is not significant

China's published patent application number: CN 101244343A can indeed achieve the purpose of oil and gas recovery, but it has the following disadvantages: in order to achieve a higher recovery efficiency of volatile oil, a lower cryogenic temperature is required, and the energy utilization coefficient of the whole machine is low; The low-temperature tail gas is directly discharged without the cooling capacity being recovered, which is a waste of energy and requires an expensive compressor suitable for cryogenic conditions; only the condenser of the first-stage refrigeration system is air-cooled, so when the temperature is low In seasons when pre-cooling is not required, the first-stage refrigeration system of this system has no practical operation meaning and wastes energy

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