The dense phase conveying system uses compressed gas to push the material to flow in the pipeline, but unlike the dilute phase conveying, its characteristics are: the mass ratio of material to gas is high, and the material moves in a "plug flow" or "dense group shape". The conveying speed is usually 1-8 m/s, which reduces the wear on the pipeline and materials. Its core feature is that the material moves in the pipeline at a low speed and high concentration, which is suitable for scenes that are sensitive to material breakage and require long-distance transportation or complex paths.