Self-adaptive variable working condition oil displacement produced gas near-zero emission recovery system and working method thereof

The adaptive variable operating condition oil recovery gas near-zero emission recovery system uses a buffer tank and a water ring vacuum pump for adaptive control, which solves the problem of separation and regeneration of high-fluctuation, high-concentration CO2 produced gas, achieves low-pressure, high-efficiency separation and resource recovery, and reduces equipment costs and energy consumption.

CN122076172APending Publication Date: 2026-05-26CCTEG CHINA COAL RES INST
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Patent Information

Application Number
CN202610516642.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-17
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively separate and regenerate highly volatile, high-concentration CO2 produced gas under low operating pressure, resulting in high equipment operating risks, high energy consumption, and low resource recovery rates.

Method used

An adaptive variable operating condition oil recovery gas near-zero emission recovery system is adopted, which includes a purification unit, a pressure swing adsorption unit, a membrane separation and purification unit, and a liquefaction unit. It utilizes a buffer tank, a pressure swing adsorption device, and a water ring vacuum pump for adaptive control, which simplifies the regeneration process, reduces operating pressure, and achieves efficient separation and regeneration.

Benefits of technology

It maintains stable separation performance under low pressure conditions, reduces equipment investment and energy consumption, improves resource recovery rate, achieves near-zero emissions and high-purity product gas recovery, and meets industrial utilization requirements.

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Abstract

The invention discloses a self-adaptive variable working condition oil displacement produced gas near-zero emission recovery system and a working method thereof. Under the condition of low operating pressure, severe fluctuation under the condition that no pressure is stabilized at the front end is effectively dealt with through a three-stage stabilizing structure, and under the self-adaptive control of a pressure swing adsorption (PSA) unit, even if only vacuum desorption regeneration is adopted, the stable separation performance can be kept under high fluctuation load. A high-power raw material gas compressor is omitted, so that the equipment investment is greatly reduced; the wall thickness and material requirements of equipment are reduced through low-pressure operation, and the cost is further saved; according to the PSA regeneration process, a complex purge gas system is omitted, the system composition is simplified, the initial investment and maintenance cost are reduced, and meanwhile purge gas consumption or product gas loss is avoided.
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