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The venturi tube is generally composed of a shrink tube, a throat tube, a diffuser tube, a receiving tank and a nozzle, and its appearance is like a waist drum. The high degree of turbulence, huge contact surface and a large number of collision opportunities make the venturi tube have higher dust removal efficiency and great mass and heat transfer effects. Venturi tubes are widely used in small and medium-scale pyrite sulphuric acid plants, and are often used as the first washing equipment for purification.