Method and device for chemical loop combustion of liquid hydrocarbon feedstocks
AssigneeIfp Energies Nouvelles
InventorsMahdi Yazdanpanah, Tiago Sozinho, Thierry Gauthier, Florent Guillou
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Abstract
The invention is a method for chemical looping (CLC) oxidation-reduction combustion of liquid hydrocarbon feedstocks carried out in a fluidized bed. A liquid hydrocarbon feedstock (2) is partly vaporized on contact with a hot particle solid (1) to form a partly vaporized liquid feedstock and to form coke on the solid prior to contacting partial vaporized liquid feedstock (19) with a redox active mass of particles (12) to achieve combustion of the partially vaporized liquid feed (19). The hot solid particles can notably be from a second fluidized-bed particle circulation loop.
Claims14
A method of performing chemical looping oxidation-reduction combustion of a liquid hydrocarbon feedstock in a fluidized bed, comprising:
- in a first reaction zone partially vaporizing the liquid hydrocarbon feedstock by contact with a hot particulate solid to form a partially vaporized hydrocarbon feedstock and a coke coating on the hot particulate solid with particles of the hot particulate solid being within group A of Geldart's classification;
- moving effluents from the first reaction zone to a second reaction zone where vaporizing of the partially vaporized hydrocarbon feedstock occurs and contact with a particulate redox active mass distinct from the hot particulate solid causes combustion of the vaporized hydrocarbon feedstock and gas resulting from gasification of the coke coated on the hot particulate solid with particles of the particulate redox mass being within group B of Geldart's classification;
- conveying effluents from the second reaction zone to a third reaction zone and therein continuing combustion of at least one of the partially vaporized liquid hydrocarbon feedstock and the gas resulting from gasification of the coke;
- separating from a mixture of effluents in a separation zone of the third reaction zone a major part of the particulate redox active mass and a gas stream containing a major part of the hot particulate solid;
- and
- conveying effluents from the third reaction zone to a fourth reaction zone and carrying out therein reoxidation of the particulate redox active mass conveyed from the separation zone prior to sending at least part of the particulate redox active mass back to the second reaction zone.
A system for chemical looping redox combustion of a liquid hydrocarbon feedstock carried out in a fluidized bed, comprising:
- a first reaction zone in which the hydrocarbon liquid feedstock is partially vaporized and in which coke is deposited on a hot particulate solid and includes an injector of the liquid hydrocarbon feedstock, means for feeding the hot particulate solid to a second reaction zone, and means for injecting a fluidization gas;
- the second reaction zone is disposed downstream from the first reaction zone in which the coke coated on the hot particulate solid is gasified and contacts a particulate redox active distinct from the hot particulate solid to combust vaporized liquid feedstock and gas resulting from gasification of the coke from contact with the hot particulate solid and comprises means for feeding the particulate redox active mass into the second reaction zone;
- means for feeding effluents from the second reaction zone to a third reaction zone for completing combustion of at least one of the vaporized liquid feedstock and gas resulting from gasification of the coke coated on the hot particulate solid and includes a separation zone for separating from a mixture in the third reaction zone a major part of the particulate redox active mass and a gas stream containing a major part of the hot particulate solid, a delivery line for the mixture, a discharge of the particulate redox active mass, and an outlet for a gas stream containing the major part of the hot particulate solid;
- and
- a fourth reaction zone for reoxidation of the particulate redox active mass obtained from the separation zone including means for feeding the particulate redox active mass from the separation zone to the fourth reaction zone, means for injecting an oxidation gas, and means for conveying a gas stream containing the particulate reoxidized redox active mass particles to the second reaction zone.
Dependencies are inferred from the claim text.