Chemical looping method for the combustion of heavy liquid hydrocarbon fractions

摘要

The invention relates to a method for upgrading heavy liquid fractions resulting from oil refining, by combustion in a fluidized-bed chemical looping process. The method according to the invention allows energy to be produced by oxidizing totally the heavy liquid feeds while allowing direct capture of the CO2 emitted in the combustion fumes. The method according to the invention also allows a synthesis gas to be produced.

主权项

1. A method for combusting a liquid feed by fluidized-bed redox chemical looping combustion, comprising:
oxidizing a redox mass on contact with air in an oxidation reactor to produce an oxidized redox mass and oxygen depleted air; separating the oxidized redox mass and the oxygen depleted air; contacting a liquid feed comprising hydrocarbon fractions, alone or in admixture, less than 10 vol. % of which have a boiling point temperature below 340° C., with the oxidized redox mass as a fluidized bed in a reduction or combustion reactor to produce a reduced redox mass and an oxidized liquid feed; wherein a residence time of the redox mass in the reduction or combustion reactor ranges between 1 and 5 minutes, the liquid feed is atomized within the fluidized bed, part of the liquid feed vaporizes on contact with the redox mass, and another part of the liquid feed condenses so as to form a coke deposit at a surface of the redox mass; and reinjecting the reduced redox mass into the oxidation reactor, wherein the liquid feed is selected from the group consisting of a residue from distillation and a residue from deasphalting, and wherein a utilization rate of the available oxygen ranges between 2 and 50 wt. %.