Spiral flow whirlwind gas separator

The invention discloses a spiral flow whirlwind gas separator. The spiral flow whirlwind gas separator comprises an outer spiral runner which consists of an outer pipeline (3) and outer spiral blades (2) in the outer pipeline (3), and both ends of the outer spiral runner are respectively provided with an inlet (1) and an outlet. The spiral flow whirlwind gas separator is characterized in that the interior of the outer pipeline (3) is also provided with an inner pipeline (7); the inner pipeline (7) and inner spiral blades (6) arranged in the inner pipeline (7) form an inner spiral runner; the flow directions of gas in the outer spiral runner and gas in the inner spiral runner are opposite; a collecting pipe (8) is arranged at the outlet of the inner pipeline (7) in the inner pipeline (7); and the outlet of the outer pipeline (3) is connected with a conical whirlwind runner (4). Two layers of spiral blades with different sizes and screw pitches are contained in the spiral flow whirlwind gas separator. At a very high spiral speed, the primary separation and the secondary separation of methane and air are realized by utilizing the principle of density contrast between the methane and the air, and finally, the density of gas discharged into the air is reduced, and the purification and the secondary utilization of the gas are realized, and the separation efficiency is high.