文章來源： 作者：羅茨機電 發布時間：2022-02-26 瀏覽次數：887
Pneumatic conveying, also known as airflow conveying, uses the force of airflow to transport granular materials to the terminal along the direction of airflow in a closed pipeline. It is the specific application of fluidization technology. The material pneumatic conveying device has the advantages of simple structure and convenient operation, and can be transported horizontally and vertically.
The material pneumatic conveying device makes a preliminary budget and configuration for the system gas ratio of materials before leaving the factory, that is, the mass ratio of materials (materials) to gas (conveying medium). The material gas ratio refers to the weight of the gas required to transport a certain weight of material. Its selected index is set according to the comprehensive consideration of material properties, material parameters, transportation form, system output, system pipe diameter and other parameters.
After all the installation work of the material pneumatic conveying device is completed according to the design idea, all the maintenance configurations are not ready to be changed, but the throttle orifice will be modified many times in this commissioning link. The purpose of modifying the orifice plate for many times is to adjust the air flow into the closed pipe, which should match the weight of the material. When the matching value is reached, we transport more materials and consume less gas, so as to save resources and stabilize the system.
In pneumatic conveying devices, there are many forms of orifice devices, such as screw type, pipe joint type, pressing plate type and so on. In the long process of institutional evolution, many advanced institutional forms have emerged. The function of throttle orifice plate is to reduce the aperture at the appropriate position of gas pipeline. When the gas shrinks through the gap, the flow beam will become thinner or shrink. The small section of the flow beam occurs downstream of the actual shrinkage port, which is called the shrinkage section. In the contraction section, the flow velocity is large, and the increase of flow velocity is accompanied by the significant decrease of pressure in the contraction section. When the beam expands to a larger area, the velocity decreases and the pressure is high, but the downstream pressure does not fully return to the upstream pressure, which is due to the greater internal turbulence consumption.