Working Principle of Negative Pressure Thin Phase Pneumatic Conveying System

The negative pressure thin phase pneumatic conveying system uses a gas pressure of less than 1 kg/cm2 and adopts a load (four-feed type) to suck the material at a higher speed to make it pass through the entire conveying line. Therefore, the conveying method is called a low pressure high speed system, which has a high gas to material ratio.

The negative pressure thin phase pneumatic conveying system uses the negative pressure roots pump as the power source, the pipeline conveying pressure force is low vacuum, the pipeline wind speed is about 10~35 m/s, and the material is fog-like in the pipeline. At the beginning of the system there is an acceleration of about 10 m/s2, and at the end it can reach a high speed of 30 m/s, so the airflow speed is high. The initial end pressure of the pipeline is basically close to atmospheric pressure, and the end is generally between -0.01 and 0.06 mpa.

When the negative pressure thin phase pneumatic conveying system is started, the material in the storage volume is rationed by the rotary lock gas supply valve, and then accelerated after mixing with the negative pressure air generated by roots vacuum pump in the pipeline. The solid gas two-phase flow is used in the conveying pipe to a more stable flow state and is lifted to a distant integrated filter separator. The mixture of air flow and material is forced to change its trajectory after entering the wall of the cyclone separator. Because the density of the solid material is much higher than that of the gas, a high centrifugal force is generated, which makes the material lose the speed of linear movement after entering the cylinder wall, fall into the cone of the cyclone under the action of gravity, and then feed evenly to the downstream production equipment through the rotary lock air discharge valve of the cone. The power source of the negative pressure dilute phase system uses Roots vacuum pump, and the gas can be filtered atmosphere or dried and purified gas. The transmission of the above materials is fully closed.