Chemical-looping combustion method with ashes and fines removal at the oxidation zone outlet and plant using same

A method for chemical-looping combustion of a hydrocarbon feedstock of solid particles, wherein an oxygen-carrying material circulates in form of particles, comprising:

• contacting hydrocarbon feedstock particles with the oxygen-carrying material particles in a reduction zone R0,
• contacting the oxygen-carrying material particles from the reduction zone R0 with an oxidizing gas stream in a reactive oxidation zone R1,
• sending a transported phase from the reactive zone R1 comprising gas and solid to a gas-solid separation zone S2 so as to separate:
• a predominantly gaseous transported phase comprising fly ashes and oxygen-carrying material fines, and a solid stream comprising the major part of the fines, the fly ashes and the major part of the oxygen-carrying material particles,
• sending the solid stream from the gas-solid separation zone S2 to a dense fluidized phase elutriation separation zone S3 fluidized by a non-reducing gas allowing to separate the fines and the fly ashes from the oxygen-carrying material particles so as to send a particle stream comprising the major part of the oxygen carrier particles to the reduction zone R0, and to discharge through a discharge line a predominantly gaseous effluent comprising the major part of the fly ashes and of the oxygen-carrying material fines.