Membrane separation and recovery technology of oil and gas in storage tank area

Chemical storage tank areas are key sources of fugitive VOC emissions. During the loading and unloading of materials, as well as due to diurnal temperature variations, the breather valves of storage tanks frequently open, intermittently discharging high-concentration organic waste gases. This type of exhaust gas has large fluctuations in concentration and complex components, and requires high response speed and stability of the processing equipment.

Membrane separation technology uses the difference in the permeation rate of different gas molecules in the polymer separation membrane to achieve selective separation, thereby enriching and recovering organic matter. Its core advantage lies in stable treatment efficiency, tolerance to flow fluctuations, fast response speed, which is very suitable for the characteristics of intermittent discharge in the storage tank area. The equipment adopts room temperature physical separation, no combustion process in the whole process, and has good applicability in the explosion-proof area.

In practical engineering, it is difficult for a single membrane separation to take into account both high recovery rate and low emission concentration, and a combined process of "condensation-membrane separation-adsorption" is usually used. The front-end condensation unit liquefies and recovers most of the oil and gas; the uncondensed tail gas enters the membrane module for further enrichment and concentration, and is sent back to the front-end cycle for treatment; the low-concentration tail gas is discharged to the standard after being checked by the adsorption unit, forming a closed cycle.

LuoyangWohong PetrochemicalRelying on the provincial oil and gas recovery engineering technology research center, Equipment Co., Ltd. provides skid-mounted membrane recovery device. The equipment integrates compression, condensation, and membrane separation units, and completes assembly and commissioning before leaving the factory. It is suitable for scenarios such as storage tank breathing valve exhaust gas, loading and unloading truck oil and gas, and meets the compliance requirements of explosion-proof areas.