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The negative pressure dilute phase pneumatic conveying system uses Roots vacuum pump as the power source, the pressure of the conveying pipeline is in a low-pressure vacuum state, the wind speed in the pipeline is about 10~30 m/s, and the material is atomized in the pipeline. The starting pressure of negative pressure conveying is equal to or close to atmospheric pressure, and the end pressure is between -10 and-60KPa, and the vacuum degree of the pipeline gradually increases along the conveying pipeline. Negative pressure dilute phase pneumatic conveying system is also called vacuum dilute phase pneumatic conveying system.