A Membrane Separation Process for Nitrogen-Containing Natural Gas with Enhanced Permeation Selectivity at Low Temperature
A low-temperature strengthening, membrane separation technology, applied in separation methods, dispersed particle separation, gas fuel, etc., to achieve the effect of improving methane recovery rate, separation efficiency, and permeability selectivity
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[0019] Embodiment 1 is aimed at the oilfield associated gas (carbon dioxide removal has been carried out) by-product of the tertiary oil recovery process with high-pressure nitrogen as the oil displacement agent in an oilfield. The nitrogen content is 29.23vol%, the water content is 2.55vol%, and the total content of hydrocarbons such as methane is 68.21vol%, and the average associated gas flow rate is 2000Nm 3 / h, using the multi-technology integration process of the present invention including gas membrane separation, adsorption dehydration, turbo expansion refrigeration and vapor compression refrigeration, the principle flow structure is as attached figure 1 As shown, high-efficiency and high-yield separation and concentration of methane to produce commercial natural gas that meets the national standard "Natural Gas GB17820-2012".
[0020] The nitrogen-containing natural gas (S1) after removing carbon dioxide first enters the first compressor (1), pressurizes to 1.80MPaG, en...
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