The application of X-ray imaging to the developments of fluidized bed processes

This paper reports some of the results obtained from a series of experiment al campaigns, carried out over several years, aimed at visualizing the flow patterns occurring inside large-scale fluidized beds by applying an X-ray imaging technique. For over 12 years, BP has been developing and applying a n X-ray imaging technique as part of its research and development programme s for both Oil and Chemicals technologies. This paper illustrates how BP ha s used the X-ray technique to identify some important process issues, in pa rticular how factors like process designs and operating conditions like tem perature, pressure and gas velocity influence the fluidization behaviour. E xamples taken from BP Chemicals Gas Phase High Productivity (INNOVENE) tech nology are discussed, and the synergies with Fluid Catalytic Cracking (FCC) spray nozzle technology are highlighted. Within an FCC unit. this techniqu e has been extensively applied to the catalyst and gas interactions within the regenerator and stripper vessels, and to air, steam and feed nozzle eva luations. (C) 2001 Published by Elsevier Science B.V.