Abstract:

Electrical capacitance tomography (ECT) was applied to dense-phase pneumatic conveying of pulverized coal, including the visualization of gas-solid flows in a horizontal pipeline.The pressure of experimental setup was up to 4.0 MPa, the solid-gas ratio was up to 11.73 kg•kg^-1, and the diameter of conveying pipeline was 10 mm.The pipeline thickness of 8-electrode ECT system was 5 mm.An improved AC-based capacitance measuring circuit was developed.Single channel capacitance measuring circuit was adopted to simplify the ECT hardware.Landweber algorithm was used to reconstruct image.The flow characteristics of dense-phase pneumatic conveying was investigated with the method of ECT experiment.Finally, the serial ECT image was compared with the result of Fluent simulation to validate the reliability.