Segmental oil gas absorption recovering method

Abstract

The invention discloses a segmental oil gas absorption recovering method, which comprises the following steps of: absorbing oil gas at normal temperature with a method for recovering oil gas through at least two sections; and absorbing at a low temperature, wherein a medium-temperature absorption section of which the absorption temperature is between normal-temperature absorption and low-temperature absorption is selectively formed between a normal-temperature absorption section and a low-temperature absorption section; and a low-temperature absorption temperature is 3-8 DEG C. Due to the adoption of the method disclosed by the invention, oil gas recovery rate is very high and is about 99 percent, tail gas can be discharged within controlling indexes of a national standard, and remarkable environmental benefit and economic benefit can be achieved; and a recovery method for segmentally and gradually absorbing is designed according to respective absorption characteristic of a normal-temperature absorption method and a low-temperature absorption method, so that energy consumption is lowered, and energy is saved.

Description

technical field [0001] The invention relates to a segmented oil gas absorption and recovery method, in particular to an oil gas recovery method combining normal and low temperature oil gas absorption. Background technique [0002] Evaporation loss is inevitable in the storage and transportation of light oil products, which not only causes serious pollution to the environment, but also causes a great waste of energy. Therefore, in recent years, oil and gas recovery technologies and methods have received widespread attention at home and abroad. [0003] Existing oil and gas recovery methods include adsorption, absorption, condensation and membrane separation, among which absorption is a simple and generally accepted method for oil and gas recovery. The absorption method is to contact the oil gas with an appropriate absorbent, and the light hydrocarbon components in the gas are dissolved in the absorbent, so that the tail gas can be discharged up to the standard. This method i...

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Problems solved by technology

The regeneration process of rich absorbent generally consumes energy. When the regeneration depth is deep, the energy consumed is more, and at the same time, the absorbent is lost more. When the regeneration depth is shallow, the effect of absorbent recycling is affected.

[0005] For gasoline transportation, sales and other enterprises, the absorbent can consider using commercial diesel as the oil gas absorbent, but if the ordinary absorption method is used, if the rich absorbent is not regenerated and used as commercial diesel, the indicators such as the flash point and distillation range of the diesel will be different. Qualified, if regeneration is carried out, the investment and operating costs of regeneration equipment are relatively high

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