Patent ID: 8528343
Filing Date: 2013-09-10
Classification: C01B,C10J,C10L,F02C,Y02E,Y02P

Abstract:
1. A method of producing substitute natural gas (SNG), said method comprising: providing at least one gasification reactor configured to generate a hot synthesis gas (syngas) stream; providing at least one syngas quenching assembly coupled in flow communication with the at least one gasification reactor; coupling at least one gas shift reactor in flow communication with the at least one syngas quenching assembly to facilitate increasing a concentration of hydrogen (H coupling at least one heat transfer apparatus downstream from the at least one gas shift reactor, such that the at least one gas shift reactor receives cooled boiler feedwater from the at least one heat transfer apparatus for use in cooling the at least one gas shift reactor; channeling a quenched syngas stream from the at least one syngas quenching assembly to the at least one gas shift reactor, coupling at least one acid gas removal unit in flow communication with the at least one gas shift reactor; coupling at least one heat recovery steam generator (HRSG) in flow communication with the at least one gas shift reactor, and coupling at least one methanation reactor in flow communication with the at least one acid gas removal unit (AGRU) and with the at least one heat recovery steam generator (HRSG), wherein the at least one heat recovery steam generator (HRSG) receives heat generated by the at least one methanation reactor.