Characteristics of fluidisation behaviour in a pressurised bubbling fluidised bed

Abstract

Abstract The experiments were carried out in a bench‐scale fluidised bed of 90 mm in diameter to determine the influence of pressure on fluidisation characteristics of Geldart A and B particles over the range of pressure 0.1–4.5 MPa. For Geldart B particles, the results indicate that minimum fluidisation velocity ( u mf ) was found to decrease with pressure whilst bed voidage at u mf was unaffected, and the bed expansion height increase with pressure at fixed value of gas velocity was observed for both Geldart B and A particles. For Geldart A particles, minimum bubbling velocity ( u mb ) bed voidage at u mb and dense phase voidage were found to increase obviously with pressure, but a slight influence of pressure on u mf was observed. The prediction values of high‐pressure fluidisation characteristics from the references' correlations developed at pressure were in agreement with the experimental data. © 2012 Canadian Society for Chemical Engineering