关键词: γ射线衰减技术, 气固两相流, 提升管, 颗粒浓度, 测量

Abstract: The solid concentration of gas-solid two-phase flow in a fluid catalytic cracking riser (f186 mm′12 m) is measured with g-ray attenuation technology. The software for processing and analyzing experimental data is programmed and 2-dimensional solid concentration contours are obtained. The solid concentration distribution shows core-annular profile in the riser, lower concentration in the center and higher concentration in the wall, which is in agreement with previous results. But the results indicate that the distribution of concentration is some asymmetric, the solids are concentrated in the area adjacent to the wall, being different from a symmetric pattern published. Comparing the measuring result by g-ray attenuation technology with that of optical fiber method, both are consistent in the distribution, but the value of solid concentration by optical fiber method is about 20% higher. And g-ray attenuation technology is a non-intrusive method, and can obtain the solid concentration profile of cross section, showing the complex characters of gas-solid two-phase flow in whole.

Key words: γ-ray attenuation technology, gas-solid two-phase flow, riser, solid concentration, measurement