Abstract
A system to sample gas from bubbles in a fluidized bed was designed, built and tested. It consisted of a dual-stem static-pressure probe (DSPP) to detect a rising bubble and a gas-sampling probe situated a small distance above the DSPP, together with a computer and hardware to interface the two probes. The DSPP was shown to provide reliable information on rising bubbles so that sampling criteria could be implemented. Tests in a gas—liquid column and in a small fluidized bed confirmed satisfactory gas sampling. The system can be adapted to operate in hot beds and is viewed as an important research tool and as a future process control device.
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