Measuring particle size and concentration of dense slurry by ultrasonic method

Abstract

Two independent ultrasonic methods for particle size and concentration of dense slurry are presented in this paper. The concentration can be obtained by ultrasonic multiple echo reflection method, which utilize the multiple reflections within the stainless steel wall to determine the acoustic impedance, velocity, density of the slurry. The particle size distribution is determined by ultrasonic attenuation spectrum method. The relationship between the particle size and ultrasonic spectra is established through a combination of a scattering model and the couple-phase model. An inversion algorithm based on optimum regularization factor is also discussed. For the purpose of on-line characterizing dense Coal-water slurry, with the set-up developed in IPTFM, the concentration and particle size distribution of coal-water slurry are measured by these two methods. The ultrasonic technique presented in this work brings the possibility of using ultrasound for on-line measurement of dense slurry.