The volume fraction of carbon dioxide in air is generally around 0.03%, if the air compressor compresses the air to 0.62 MPa, the partial pressure of carbon dioxide can be calculated as 186 Pa. At the temperature when the air enters the air separation device, the saturated vapor pressure of carbon dioxide is much higher than the partial pressure of carbon dioxide, so carbon dioxide is in an unsaturated state, and carbon dioxide in the air will not be precipitated in advance. Therefore, all carbon dioxide in the air is carried into the small air separation unit.
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