Process method for absorbing oil gas at low temperature

Abstract

The invention provides a process method for absorbing oil gas at low temperature. Absorption equipment and an absorbent provided by the invention are adopted, and oil gas is efficiently treated through absorbent cooling, oil gas absorption, absorbent evaporation and regeneration, and regeneration gas phase pressurization, condensation and recovery. A special absorption tower structure is designed,a certain amount of absorbent is kept in the absorption tower for a long time, the effect is equal to that of an activated carbon adsorption tank, and the structure adapts to an intermittent operation mode of oil-gas recovery. A gas-phase product generated by regeneration is absorbed, and the oil product is effectively recycled by adopting a screw compressor pressurizing and condensing mode. Thewhole device can be independently used for oil gas recovery without being connected with an activated carbon adsorption device in series, and the effect is very excellent.

Description

technical field [0001] The invention provides a method for recovering high-concentration oil and gas, in particular an absorption and adsorption integration method based on a new type of absorption tower, combined with a specific low-temperature absorbent, and adopting full-process system control operation, which belongs to the technical field of environmental protection and energy saving. Background technique [0002] In the process of exploitation, refining, transportation and storage of petroleum and various chemical products, oil evaporation process will inevitably occur, resulting in oil loss and oil gas pollution. It is becoming increasingly important to control oil loss and vigorously develop and promote oil and gas recovery technology and devices. [0003] Oil and gas recovery technology can be divided into absorption method, adsorption method, condensation method and membrane separation method in principle. Among them, the activated carbon adsorption method is the ...

AI Technical Summary

Problems solved by technology

The entire oil and gas treatment process consists of four parts: absorption tower absorption and separation, desorption tank desorption concentration, recovery tower absorption recovery, and heat exchange process for providing heat to the desorption tank. Although this technology has a recovery rate of more than 90% for oil and gas, 90% % treatment efficiency cannot meet the environmental protection requirements, because the emission standard requirement in the field of oil and gas storage and transportation in my country is less than or equal to 25 g / m3, while the emission standard of air pollutants in my country is generally not more than 120 mg / m3, the two The gap is huge. With the improvement of environmental protection standards, better treatment processes are urgently needed

The selection of absorbent used in the past absorption process is unreasonable, the equipment design is unreasonable, and the absorption efficiency of oil and gas is low; most of them do not use low-temperature absorption process, and the regenerated oil and gas cannot be fully recovered only by the condenser, resulting in secondary pollution

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