Abstract:

A cold model experiment was conducted in a cyclone dipleg with 150 mm inner diameter and 5000mm high fitted with trickle valve. FCC equilibrium catalyst was used as experimental materials. The effect of outlet inner diameter on the discharge characteristics of cyclone dipleg with trickle valve at the conditions of solid mass flux (Gs) between 0 to 50 kg/(m2?s) and negative pressure difference (ΔP) of 0 to 10 kPa was investigated. The experimental results show that there are two types of discharges, i.e. continuous discharge and intermittent discharge. The discharge forms, axial pressures and flapper plate opening angle were affected by changes of ID of trickle valve outlet, compared with conventional cyclone dipleg-trickle valve. Under the same operating conditions, the flapper plate opening angles of the cyclone dipleg- trickle valve with smaller ID of outlet pipe are all less than the case with larger ID of trickle valve outlet.

Key words: cyclone separator, dipleg, trickle valve, discharge characteristics