Plant and method for chemical looping oxidation-reduction combustion of a gaseous hydrocarbon feedstock with catalytic pre-reforming of the feed

A plant for chemical looping oxidation-reduction combustion of a gaseous hydrocarbon feed, comprising:

• a pre-reforming zone comprising a fixed catalyst for a reforming reaction, an inlet for the gaseous hydrocarbon feed, a feed point for an oxidizing reforming gas, and an outlet for a gas mixture comprising syngas,
• a reduction zone comprising an inlet configured for injecting a fluidization gas, a feed point for the gas mixture, an inlet for a redox active mass comprising particles, an outlet for a gaseous effluent, and an outlet for the redox active mass,
• an oxidation zone comprising a feed point for the redox active mass from the reduction zone, an inlet configured for injecting an oxidizing fluidization gas, an outlet for a depleted oxidizing gas, and an outlet for the redox active mass,
• wherein the pre-reforming zone and the oxidation zone or the pre-reforming zone and the reduction zone are thermally integrated in the same reactor while being separated by at least one thermally conductive separation wall, and
• the reactor comprises at the center thereof the reduction zone or the oxidation zone surrounded by a rigid casing, the casing comprising, from the center to the periphery of the reactor, a first layer made of a thermally conductive anti-abrasion material and of a second layer made of a refractory material, the pre-reforming zone being integrated in the casing.