1. The stacking angle is one of the important parameters in determining the transportability of materials, and the flowability of the material is crucial. Stacking angle is usually used to represent the angle between the conical surface of a cone and the horizontal plane formed by the material being poured and stationary from a certain height. The smaller the angle, the better the liquidity, and vice versa. But for some special materials, the stacking angle cannot accurately represent the fluidity.
2. Bulk density refers to the unit volume weight of a material in a loose state. Due to the presence of substances and air in particles or powders, the packing density varies according to different packing forms, so it is necessary to measure the actual packing density in its actual state.
3. The weight, particle size distribution, shape, and hardness of particles are key factors affecting material flowability and conveying system design.
4. Moisture sensitivity: All materials have hygroscopic properties, and some materials that are sensitive to moisture may change their flowability due to hygroscopic clumping, even sticking to the pipe wall or filter surface, leading to pipe or filter blockage.
5. Explosion hazard: When fine particles mix with air to a critical concentration, sparks may occur and an explosion may occur. There are three necessary conditions for dust explosion: oxygen, critical concentration, and spark. It is difficult to control the concentration of materials during transportation, but oxygen and sparks can be controlled. Oxygen is isolated using inert gas protection to eliminate static electricity and avoid sparks, thereby controlling the risk of explosion.
6. Toxic powder leakage can cause environmental pollution and personal injury, and reliable technology and equipment must be used during transportation to avoid it. Vacuum conveyor is a safe choice because the pressure inside the conveying system is lower than atmospheric pressure, so there will be no leakage. In addition, the gas discharged from the conveying system must undergo reasonable and harmless treatment to meet the emission standards.
7. Some powders have strong corrosiveness, so it is necessary to choose suitable materials to manufacture vacuum conveyors.
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