Abstract: The catalyst/oil ratio in the riser of FCCU has an important influence on the reaction depth. It is necessary to monitor and regulate the catalyst/oil ratio in real-time. A real-time measuring method for catalyst/oil ratio in the riser of FCCU was proposed based on the relationship between pressure drop and particle mass flow rate in the T-bend at exit of the riser. The results indicated that the method is feasible and the measured data is credible.

Key words: FCCU, riser, T-bend, catalyst/oil ratio, particle flow rate