Working performance of rough cut cyclone in FCC separator

Key words:  rough cut cyclone  gas velocity  mass concentration  gravity valve

Abstract:

The influences of inlet gas velocity, solid mass concentration and adding a gravity valve to the dipleg tail on the performance of a rough cut cyclone with diameter of 300 mm were tested in an FCC separator experimental model. The results show that after adding the solid phase, the loss of swirling energy of motion and pressure drop of the cyclone separator decrease, and the gas discharge of the dipleg increases. Improving inlet gas velocity advantages to decrease the gas discharge of dipleg and increase the separation efficiency of rough cut cyclone separator, especially for granular particles. Furthermore, with the solid mass concentration increasing, the pressure drop of rough cut cyclone separator decreases, and the separation efficiency and gas discharge of dipleg increase. The presence of the gravity valve makes the gas discharge decrease by 3％ and the separation efficiency improve. The structure related pressure drop model has good accuracy for calculating pressure drop of rough cut cyclone.