Method for recovering oil gas and device

Abstract

The invention relates to a method for recovering oil gas and a device. Oil gas exhausted from an oil product storage device is firstly condensed; condensate is recovered; uncondensed gas phase enters an adsorption device for adsorption; after being in adsorption saturation, the adsorption device is regenerated by adopting a vacuum regeneration manner; and concentrated oil generated by vacuum regeneration is recycled to the oil product storage device. According to the method and the device, provided by the invention, the oil gas is recovered by combining the mode of returning the oil gas to the oil product storage device and an oil gas recovery technology, desorbed oil gas is returned to the gas-liquid balanced system of the oil product storage device, the partial pressure of the oil gas is increased, and the loss of an oil product, caused by evaporating, is fundamentally reduced. The method and the device, provided by the invention, have the characteristics of large operating flexibility, low energy consumption, small investment, no potential safety hazard, reachability in tail gas emission standards, and the like.

Description

technical field [0001] The present invention relates to an oil and gas recovery method and device in the technical field of environmental protection and energy saving, in particular to an oil and gas recovery method and device for recovering hydrocarbons from volatilized oil and gas in the process of loading and unloading light oil products and making exhaust gas meet the discharge standard . Background technique [0002] During the storage, transportation and sales of light oil products, a large amount of oil and gas escapes. According to statistics, the oil products lost by the escape of light oil products account for about 0.5% of the light oil products every year. On the one hand, this leads to a large amount of waste of oil and gas resources, reducing the economic benefits of enterprises, and on the other hand, it leads to serious environmental pollution. In addition, since oil and air easily form explosive mixtures (the lower explosion limit is generally 1% to 6%), t...

AI Technical Summary

Problems solved by technology

When activated carbon adsorbs oil and gas components, the adsorption and heat release will cause a large temperature rise in the activated carbon bed, especially when the concentration of oil and gas is high, the activated carbon bed is prone to local overheating, thereby reducing the service life of the adsorbent and making the operation There are safety hazards in the process

[0004] CN1494454A discloses a device that adopts activated carbon adsorption method to recover organic matter. After the adsorption stops, the organic components are desorbed and adsorbed by steam, and then enter the condenser to condense and recover, and a large amount of steam is introduced to condense, which increases the operating cost of the device

CN1522785 discloses a method for recovering oil and gas, which compresses and cools the oil and gas, and absorbs it under pressurized conditions. Difficult to operate stably

Due to the mixture of desorbed oil and gas and collected oil and gas, oil and gas back-mixing reduces the dew point of desorbed oil and gas, requiring a lower condensation temperature, which greatly increases the operating cost of this condensation-adsorption combined process

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