METHOD AND APPARATUS FOR THE PRODUCTION OF NATURAL GAS SUBSTITUTES

摘要

1. A method of producing substitute natural gas (ZPG) of fresh raw syngas (11), including at least the reaction stages fresh synthesis gas section (10) methanation comprising at least a first adiabatic reactor (101) and other adiabatic reactor (s) (102-104) connected in parallel, so that each of them receives a gas stream withdrawn from the preceding reactor methanation section, and is carried out by recycling at least a portion (22) of the reaction gas as a raw gas at at least one of reactors, wherein said fresh syngas feedstock (11) is fed in parallel to said reactors (101-104). ! 2. The method of claim 1, wherein said fresh syngas feedstock (11) is divided into a series of fresh gas streams (12, 14, 15, 16), each of which is fed into one of the reactors (101-104). ! 3. The method of claim 2, wherein each of said fresh gas streams (12, 14, 15, 16) is 15-35 mol.% Of the total flow (11) of the gas feed. ! 4. The method of claim 1, wherein the step of gas recirculation is carried out by selection portion (22) of the reaction gas flow (20) from the first reactor (101) and using said portion (22) of the gas as a recycle gas for the dilution flow (12) of fresh gas entering the first reactor (101) to obtain a flow (18) of the diluted gas at the inlet of the first reactor. ! 5. The method of claim 4, wherein the portion (22) of the reaction gas flow fed to the inlet of the first reactor (101) on the recirculation loop (40) comprising a compressor (23) to the recycle gas stream (22) and the heater (17 ) for heating said diluted gas stream before entering the first reactor (101). ! 6. The method of claim 4,