Configuration Scheme of Membrane Separation in Three Stage Oil and Gas Recovery at Gas Stations

Configuration Scheme of Membrane Separation in Three Stage Oil and Gas Recovery at Gas Stations

The three rounds of oil and gas recovery at gas stations mainly target the treatment of volatile oil and gas generated by respiration and temperature changes in storage tanks. Membrane separation technology has become one of the mainstream processes for tertiary oil and gas recovery due to its high separation efficiency, low energy consumption, and no secondary pollution. It is usually used in combination with condensation technology.

The typical process route is condensation and membrane separation. When the pressure inside the underground oil storage tank reaches the set value, the system automatically starts. The oil and gas first enter the condensation unit, and after two stages of pre cooling and deep condensation, the condensation temperature drops to minus 20 to minus 30 degrees Celsius. Most of the oil and gas liquefies into liquid gasoline and flows back to the storage tank. After condensation treatment, the uncondensed nitrogen rich tail gas enters the membrane separation unit.

gas separation membraneThe difference in selective permeation rate between oil and gas components and air components. The permeation rate of hydrocarbon organic compounds in the membrane is slow, and they are intercepted and recycled back to the oil storage tank. The permeation rate of air components such as nitrogen and oxygen is fast, and they meet the emission standards after passing through the membrane layer. Through this separation method, the membrane unit further enriches the hydrocarbons in the uncondensed gas, and the overall oil and gas recovery rate can reach over 95%.

The configuration of membrane components must meet the following technical specifications: the oil and gas processing capacity of a single membrane component should not be less than 100 cubic meters per hour, the design pressure should not be less than 1.0 megapascal, the operating temperature should not exceed 50 degrees Celsius, and the service life should not be less than eight years. In the system configuration, the inlet and outlet ends of the compressor are respectively connected to the oil storage tank and the condensing unit, allowing the oil and gas in the tank to circulate and enter the condensing process. The high concentration oil and gas separated by membrane components are returned to the underground oil storage tank through the return oil pipeline, while the air is emptied.

The control system adopts PLC automatic control to achieve automatic cyclic operation of oil and gas separation and membrane cleaning. When the pressure in the gas phase space of the underground oil storage tank is higher than the set value, the system automatically starts the oil and gas recovery program, and automatically stops when the pressure is lower than the set value. The entire device adopts a lever mounted structure, with all components integrated into one rack. All electrical equipment adopts explosion-proof design to ensure safe operation in flammable and explosive places.

LuoyangWohong PetrochemicalEquipment Co., Ltd. can provide a complete set of membrane separation configuration solutions for three oil and gas recovery at gas stations, including modular integration, explosion-proof design, and automation control systems. The company is located in W2-1, Dongda Science and Technology Industrial Park, Luoxin Industrial Agglomeration Zone, Xin'an County, Luoyang City, with the website www.wohongshihua.com.