The New Modular Pneumatic Conveying Feeder Characteristics Of Pressure Drop

The feeder, which is the most critical component in the low-pressure pneumatic conveying system, could directly affect the whole pneumatic conveying system's stability. The value and stability of pressure drop can directly influence the feeder's performance. The mission of this project is studying the pressure drop characteristics of combined feeder. The main contents are as follows:1,Combining the conventional feeder's characteristics of pneumatic conveying system, the helical pump's continuous feed characteristic and storage pump's low pressure loss characteristic, a new combined feeder is designed.2,The physical model of combined feeder is built by increasing the length of entrance and exit of the feeder, assuming the speed of the feeder keeps constant and the feeder is absolute symmetry along symmetry planes; Basing on the DPM mathematic model of the CFD simulation software Fluent, the gas-particle mathematic model of the feeder is gained, which provides the conditions for the numerical simulation.3,The pressure drop characteristics factors, such as structure parameters and technical parameters, are studied. Then the relation curves between H, D, d, solid flux, particle size, particle density, backpressure of the feeder and the pressure drop characteristics are obtained.4,Aiming at the pressure fluctuation of the pneumatic conveying system, a series of measures are used to maintain the steady of system pressure; then measure the pressure drop characteristics of 12 different exterior size combined feeder are measured. By analyzing the pressure drop characteristics, the curve between exterior size and pressure drop characteristics is achieved. By comparing the curve to the numerical simulation result, the validity of numerical simulation has been testified. Then, choose the optimum size of the combined feeder.