Abstract: Aiming at the failure of the high temperature flue gas turbine of catalytic cracking energy recovery unit, new guide vane cyclone separation technology was adopted. This paper put forward the modification scheme of new vertical and multi-tube three-stage cyclone separators (three-stage cyclone for short) of high efficiency and low resistance. After modification, the catalyst concentration of flue gas by on-line testing from three-stage cyclone outlet was 92.5 mg/m³. The particle size of powder was less than 10 microns. This indicated that the performance of three-stage cyclone separation completely met the purification requirements of flue gas of flue gas turbine inlet. This can ensure the long-cycle and safe operation of the flue gas turbine.

Key words: catalytic cracking/ FCC, cyclone separator, single tube, modification