Integrated method for gasification and indirect combustion of solid hydrocarbon feedstocks in a chemical loop

摘要

The invention relates to an integrated method for gasification and indirect combustion of a solid hydrocarbon feedstock in a chemical loop, comprising:;contacting solid hydrocarbon feedstock (1) with water (2) in a gasification reaction zone RG in order to discharge ashes (9) and to produce a gaseous effluent (3) comprising syngas and water,;supplying reduction reaction zone RR of a redox chemical loop with at least part of gaseous effluent (3) produced in the gasification reaction zone in order to produce a CO2 and H2O-concentrated gaseous effluent (4),;reoxidizing the oxygen-carrying solid particles from reduction reaction zone RR of the chemical loop in oxidation reaction zone RO by means of an oxidizing gas (6) and discharging fumes (7).;The invention also relates to a plant allowing said integrated method to be implemented.

主权项

1. An integrated method for gasification and indirect combustion of a solid hydrocarbon feedstock in a chemical loop, comprising:
contacting solid hydrocarbon feedstock with water in a gasification reaction zone RG to conduct an endothermic gasification reaction, discharge ashes and produce a gaseous effluent comprising syngas CO, H2 and H2O, wherein oxygen for the endothermic gasification reaction is supplied only from the water or the water and CO2; supplying reduction reaction zone RR of a redox chemical loop wherein oxygen-carrying solid particles Me/MeO circulate with at least part of gaseous effluent comprising syngas CO, H2 and H2O produced in the gasification reaction zone to reduce the oxygen-carrying solid particles Me/MeO and combust the syngas to produce a CO2 and H2O-concentrated gaseous effluent; and reoxidizing the oxygen-carrying solid particles from reduction reaction zone RR of the chemical loop in oxidation reaction zone RO by means of an oxidizing gas and discharging fumes; wherein contacting of the solid feedstock with water in the gasification reaction zone is performed without direct contact with the oxygen-carrying solid particles Me/MeO, and wherein energy required for the endothermic gasification reaction in gasification reaction zone RG is provided at least partly by exothermic combustion of all or part of the syngas in the redox chemical loop.