A non-stop defrosting oil gas adsorption-condensation treatment device and oil gas recovery method

Abstract

The invention relates to an oil gas adsorption-condensation treatment device capable of defrosting without shutdown and an oil gas recycling method. The oil gas adsorption-condensation treatment device comprises a pair of adsorption towers, a first-grade heat exchanger, a second-grade heat exchanger, a third-grade heat exchanger and a vacuum pump, wherein a condensation system for oil gas condensation and separation is formed by the first-grade heat exchanger, the second-grade heat exchanger and the third-grade heat exchanger; oil gas is pre-condensed so that water vapor and part of hydrocarbons in the oil gas are condensed firstly; then the oil gas enters hydrophilic silica gel filling layers in the adsorption towers through inlet pipelines at the bottoms of the adsorption towers and an oil gas mixture to be recycled is further subjected to drying treatment; then the oil gas mixture is subjected to adsorption recycling through active carbon filling layers at the upper parts of the adsorption towers; high-concentration oil gas which is desorbed by the adsorption towers in vacuum enters the condensation system again through a regeneration pipeline and then is subjected to condensation recycling; all the heat exchangers of the condensation system are coupled together and a condensation / defrosting mode of a condenser is carried out at the same time, so that the aims of running thecondensation system without the shutdown and improving the working efficiency are realized.

Description

technical field [0001] The invention relates to the technical field of oil and gas recovery, in particular to an oil and gas adsorption-condensation treatment device for non-stop defrosting and an oil and gas recovery method. Background technique [0002] At present, common oil and gas treatment methods include condensation, absorption, adsorption, and membrane separation. In engineering, the method of "adsorption-condensation" is often used to recover oil and gas, so that it can meet the non-methane total hydrocarbons ≤ 120mg / m stipulated in my country's "Petroleum Refining Industrial Pollutant Discharge Standard" GB31570-2015 3 emission standards. The conventional "adsorption-condensation" integrated treatment method does not dry the oil-gas mixture, and the mixed gas with high water content directly enters the adsorption tower, which causes the water vapor in the mixed gas to compete with light hydrocarbons for adsorption, affecting the adsorption effect of the adsorptio...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the prior art, the present invention provides a non-stop defrosting oil gas adsorption-condensation treatment device and an oil gas recovery method to solve the problem of the oil gas recovery system in processing large flow, high Humidity, water vapor and air in the working process of low-concentration oil and gas affect the recovery efficiency and normal operation of the recovery system, and a method of drying oil and gas using a shallow condensation device and a hydrophilic silica gel packing layer is proposed

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