EMD and three order cumulant analysis for differential pressure signal of gas-solid two-phase flow

Taking the dilute gas-solid two-phase flow in the horizontal pipe as an example, the differential pressure signals are obtained under different solid-gas mass ratios and different gas flowrates. The methods of emperical mode decomposition (EMD) in Hilbert-Huang transform (HHT) and three order cumulant in blind signal separation are used to analyze the differential pressure signals. Because HHT transform is suitable for nonlinear and non-stationary signals, the differential pressure signals are decomposed into intrinsic mode function (IMF). After acquiring signal energy and filtering noise frequency, the Gauss noise is further removed, the signal-to-noise ratio is improved with three order cumulant, and the signal value is estimated. The experiment results show that the energy can be used to analyze the differential pressure fluctuation in dilute gas-solid two-phase flow. When the solid-gas mass ratio increases, the differential pressure signal also increases under different gas flowrates. The bigger the solid-gas mass ratio is, and the more obviously the differential pressure signal in/creases under the same gas flowrate. The standard deviation of the differential pressure signal significantly decreases after signal processing, which indicates that the EMD and three order cumulant can further explore the differential pressure characteristics of the dilute gas-solid two-phase flow.