The movement state of the material seal pump of the powder pneumatic conveying equipment
When the powder pneumatic conveying material seal pump is working, the movement state in the pump body will change with the characteristics of the conveyed material, so as to form various motion states of the powder pneumatic conveying material seal pump. Common movement states of materials are as follows.
1. For the bottom flow or line flow of the materials conveyed by the powder pneumatic conveying material seal pump, when the wind speed of the air source part decreases, most of the materials in the transverse pipe gather at the bottom of the pipe. Pneumatic conveying of the material seal pump, but without stagnation, i.e. the flow state of different suspended amounts up and down the pipeline. In the elbow or riser of the material seal pump of the powder pneumatic conveying equipment, a straight flow occurs near the outer pipe wall. For this flow state, if the wind speed does not change, the mixing ratio can only be increased.
2. When the wind speed decreases or the mixing ratio increases, there will be unstable dense flow, and the air pressure will also fluctuate. The lower part of the dense part has a lower velocity and the upper part has a higher velocity. All the dense sections will turn and move forward, but the fast particles will gradually escape. If a slow swarm of particles is formed, but there is no stagnation, and some particles slide at the bottom of the pipe, it is the ultimate state of particle suspension transport.
3. The common conveying state of the powder pneumatic conveying material seal pump is piston flow or piston flow, which is the situation encountered when the powder pneumatic conveying material seal pump conveys cement. Since cement is a fine powder that is not easy to be suspended, it is easy to form a plug flow, and the transportation of the plug flow is pushed forward by the pressure difference between the front and back of the plug. Compared to suspended flow, this state differs in principle in terms of the mode of force and the friction of the pipe wall. Among them, the piston flow is transported by the differential pressure, and the suspended flow is transported by the differential pressure. The above three are the common motion states of powder pneumatic conveying and material seal pump conveying, but there will be other motion states when conveying materials, such as bias flow, group flow, and flow sharing.
The above is the common movement state of the material seal pump of the powder pneumatic conveying equipment, and the first two states belong to the suspension conveying state. When the material seal pump of the powder pneumatic conveying equipment conveys materials, in addition to the above three states, there will also be movement states such as diversion, group flow, and flow sharing.