Study On The Acoustic Detection Sensor With A Probe For Measurement Of Dilute Gas-solid Two-phase Flow

Gas-solid two-phase flow widely exists in industrial processes. The on-linemeasurement and subsequent optimized control of the critical parameters areimportant to improve operation efficiency, reduce costs and conserve energy.However, it is generally accepted that the measurement of gas-solid two-phase flow isa difficult problem. A wide variety of factors can influence the measurement indifferent ways. Among many measurement methods, the measurement method basedon acoustic detection with the characteristic of simple structure, low cost, highsensitivity has been paid more and more attention to.A two-phase flow measurement model based on the probe acoustic detection isestablished though the analysis of acoustic emission theory. According to themeasuring principle, a probe of acoustic detection measurement system and signalacquisition system is built. The probe is inserted into the pipe while the acousticsensor is placed outside the pipe in case of corrosion. The main work of this paper isshown as followed:1. Experiments of single-particle impact and multi-particle impact have beencarried out, and the frequency of the acoustic signal detected under different velocityand number of the particles is studied.2.The sample time and sample frequency are given out and the effects ofdifferent size of the probes on the acoustic signals are examined based on the gas-solidtwo-phase flow rig.3.Using the parameter analysis method and the frequency analysis, theeigenvalue of the acoustic signal under different solid concentrations and superficialair velocities under dilute phase pneumatic conveying is extracted. Besides, thechange of the eigenvalue at different solid concentrations and velocity is studied.