摘要:
The invention relates to a plant and to a method for chemical looping oxidation-reduction combustion of a gaseous hydrocarbon feed, for example natural gas essentially containing methane. According to the invention, catalytic pre-reforming of the feed is performed in a pre-reforming zone comprising a fixed reforming catalyst, while benefiting from a heat transfer between the reduction or oxidation zone of the chemical loop and the pre-reforming zone adjoining the reduction or oxidation zone. Pre-reforming zone (130) and oxidation zone (110) or pre-reforming zone (130) and reduction zone (120) are thus thermally integrated within the same reactor (100) while being separated by at least one thermally conductive separation wall (140).
摘要:
The invention relates to a method for chemical looping (CLC) oxidation-reduction combustion of liquid hydrocarbon feedstocks carried out in a fluidized bed, wherein liquid hydrocarbon feedstock (2) is partly vaporized on contact with a hot solid (1) in form of particles so as to form a partly vaporized liquid feedstock and to form coke on said solid (1), prior to contacting partly vaporized liquid feedstock (19) with a redox active mass in form of particles (12) so as to achieve combustion of partly vaporized liquid feed (19). Hot solid particles (1) used to carry the coke can notably form a second fluidized-bed particle circulation loop, the first one being the circulation loop of the oxygen-carrying redox active mass (12) circulating between the oxidation and combustion reactors, thus allowing coke-carrying particles (1) to be recycled to the process.
摘要:
The invention relates to a CLC plant for the combustion of solid hydrocarbon feedstocks generating particles of unburnt residues, comprising a solid/solid separator above the combustion reactor in order to efficiently separate the particles of the oxygen-carrying solid from the particles of unburnt residues contained in the gas/solid mixture (14) exiting from the combustion reactor. The chamber (1) of the solid/solid separator, the combustion reactor and the inlet (2) for the gas/solid mixture (14) of the chamber have a parallelepiped shape. The inlet (2) is equipped at its top with means (3) for distribution of said gas/solid mixture in the chamber which extend over the entire length of the inlet, improving the solid/solid separation.
摘要:
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.
摘要:
The present invention relates to a device and a method for chemical looping combustion, for which the end of the intake duct (4) opening out within the chamber of the separator (1) is inclined with respect to a horizontal plane (H).
摘要:
In a method and a plant for chemical looping oxidation-reduction combustion (CLC) of a gaseous hydrocarbon feed, for example natural gas essentially containing methane, catalytic reforming of the feed is performed within the reduction zone where combustion of the feed is conducted on contact with an oxidation-reduction active mass in form of particles. The reforming catalyst comes in form of untransported fluidized particles within the reduction zone. The catalyst thus confined in the reduction zone does not circulate in the CLC loop.
摘要:
The invention relates to a method and to a device for chemical looping combustion CLC of a solid hydrocarbon feed wherein it is proposed to inject the solid hydrocarbon feed so as to limit any occurrence of sticking of the feed to the walls of the injection device. The solid feed is fed into a conveying zone operating under fluidized bed conditions and opening into a combustion reactor. A fluidization gas is injected into this conveying zone while controlling the flow of gas in such a way that the superficial velocity of the gas in the conveying zone is higher than the terminal velocity of the solid hydrocarbon feed particles and the terminal velocity of solid particles present in the combustion reactor, and while controlling the fluidization gas temperature in such a way that the temperature in the conveying zone is less than or equal to 500° C.
摘要:
The invention relates to a process and to a unit for chemical looping oxidation-reduction combustion of a hydrocarbon feed, wherein heat exchanges are controlled through a level variation of a dense fluidized bed of active mass particles in an external heat exchanger (E1, E2), positioned on a transport line carrying particles circulating between a reduction zone (210) and an oxidation zone (200) for the particles in the chemical loop. The bed level variation is allowed through controlled application of a pressure drop on a fluidization gas outlet in the heat exchanger, said pressure drop being compensated by the level variation of an active mass particle bed in a reservoir zone provided on the particle circuit in the chemical loop.
摘要:
The invention relates to a method for chemical-looping combustion of a hydrocarbon-containing feedstock, comprising: contacting oxygen-carrying material particles coming from a reduction zone R0 with an oxidizing gas stream in a reactive oxidation zone R1, separating the fly ashes, the fines and the oxygen-carrying material particles within a mixture coming from zone R1 in a dilute phase separation zone S2, the driving force required for dilute phase elutriation in S2 being provided by the oxidizing gas stream from reactive oxidation zone R1. Optionally, partitioning is carried out in a dedusting zone S4, then possibly in a dense phase elutriation separation zone S5. The invention also relates to a chemical-looping combustion plant allowing said method to be implemented.
摘要:
The invention relates to a catalyst comprising a support based on alumina or silica or silica-alumina, at least one group VIII element, at least one group VIB element and at least one organic compound of formula (I) in which R1 is a hydrocarbon-based radical comprising from 1 to 12 carbon atoms, R2 and R3 are chosen from a hydrogen atom and a hydrocarbon-based radical comprising from 1 to 12 carbon atoms, X is chosen from an oxygen atom or a sulfur atom except when R2 and R3 represent a hydrogen atom, in which case X is an oxygen atom, Y is chosen from a hydrogen atom, a hydrocarbon-based radical comprising from 1 to 12 carbon atoms or a unit —C(O)R4, R4 being chosen from a hydrogen atom and a hydrocarbon-based radical comprising from 1 to 12 carbon atoms.