An improved isokinetic sampling probe for measuring local gas velocity and particle mass flux of gas—solid suspension flows

Abstract

An improved isokinetic sampling probe system for measuring both local gas velocity and particle mass flux of gas—solid suspensions in a closed conduit was recently developed. This system was first tested in a 51-mm ID continuous two-phase flow loop loaded with glass beads up to a 1.5 mass ratio, and then with coal particles in a rectangular duct with an aspect ratio of 11:1. Both experiments were conducted with the conveying velocity up to 28 m/s. The probe system was found to offer convenient, reliable, and continuous measurements of local particle mass flux and gas velocity. Since no collecting filters are used, errors in measuring the particle mass flux due to moisture, timing, and holdup volume can be eliminated. The new system serves as the primary standard for gas and particle measurements and requires no calibration curve or empirical equation. The design features, working principles, component characteristics, overall performance, measurement errors, and test results are discussed.