Basic theory of pneumatic conveying Pressure drop in pipeline conveying
When using pipeline transportation, the pressure drop must be considered in order to select the appropriate pipeline size and fan specifications.
In the two-phase flow of unevenly dispersed media, the causes of pressure drop are:
(1) Frictional resistance and local resistance during air flow;
(2) Friction between the fiber medium and the pipe wall The pressure loss;
(3) The resistance loss caused by the acceleration of the fiber medium when it is imported or fed; (4) The force required for the fiber medium to pass through the pipeline, such as gravity.
When conveying cotton or lint, the pressure loss or pressure drop is greater than when conveying air at the same speed. The more materials are conveyed, the greater the pressure loss. Therefore, in the two-phase flow where the fiber medium and air are mixed, In dealing with engineering problems, for the sake of simplicity, the pressure loss during pure air flow can be calculated by multiplying the correction coefficient, that is, the pressure loss along the way ΔP m and the local pressure loss ΔPj are:
AAAZXCASFWEFERH
