关键词: fluidized bed;measuring method;optical fiber probe;local solid flux

Abstract: Previous works have shown that the suction probe cannot be used to accurately measure the
upward and downward particle fluxes independently. A new method using a single optical
probe to measure the local solid flux is presented. The measurement of upward, downward and
net solid fluxes was carried out in a cold model circulating fluidized bed (CFB) unit. The
result shows that the profile of the net solid flux is in good agreement with the previous
experimental data measured with a suction probe. The comparison between the average solid
flux determined with the optical measuring system and the external solid flux was made, and
the maximum deviation turned out to be 22%, with the average error being about 6.9%. These
confirm that the optical fiber system can be successfully used to measure the upward,
downward and net solid fluxes simultaneously by correctly processing the sampling signals
obtained from the optical measuring system.

Key words: fluidized bed, measuring method, optical fiber probe, local solid flux