The novel FDFCC grid packing stripper is used to raise the stripping efficiency of the equipment.This technology aims to increase the gas-solid contact area and improve the gas-solid contact efficiency.This technology has been applied in the revamped 1.05 Mt/a No.1 FCC unit at the SINOPEC Changling Branch Company.The outcome on application of this equipment has revealed that the fluidization of the stripper was stable coupled with smooth operation.At a steam stripping load of less than 50%of the design value the spent catalyst had a lower H/C ratio,and the hydrogen content in the coke after revamp of the FCC unit decreased by 8.1%compared to the case before the equipment revamp.The spent catalyst had higher activity with the dry gasand coke yields reduced by over 0.5%.resulting in good economic benefits.