METHANATION SYSTEM AND METHOD FOR THE CONVERSION OF CARBONACEOUS MATERIAL INTO METHANE

摘要

The present invention provides a methanation system (36) for the conversion of carbonaceous material into methane, comprising: - a gasifier (1) for gasifying carbonaceous material into syngas, said gasifier being at least partially steam fed and comprising: - an internal volume (4) comprising an upper section (5), a middle section (6) and a lower section (7), and optionally a first connecting section (10), connecting said upper section (5) and said middle section (6) and/or a second connecting section (11), connecting said middle section (6) and said lower section (7), wherein said upper section (5), middle section (6) and lower section (7) are arranged along the longitudinal direction of said gasifier (1), with the upper section (5) placed on top of the middle section (6) which is placed on top of the lower section (7); - one or more carbonaceous material inlets (2) configured to receive a carbonaceous material feed and fluidly connected to the internal volume (4); - a bed material (9) inside the middle section (6) and/or lower section (7) and connected to at least one gas inlet (12) to fluidize the bed material; - a gas outlet (16), fluidly connected to the upper section (5) of the internal volume (4); and - at least one plasma system (8) configured inside the upper section (5) so that gas that leaves the gasifier (1) via the gas outlet (16) passes through a zone heated by said at least one plasma system (8); - a first cooling unit (18, 29), comprising a hot gas inlet (19) and a cold gas outlet (20), wherein said hot gas inlet (19) is fluidly connected to the gas outlet (16) of said gasifier (1); - a methanation unit (21), suitable to produce crude methane from syngas, comprising a syngas inlet (22) and a crude methane outlet (23), wherein said syngas inlet (22) is fluidly connected to said cold gas outlet (20) of the first cooling unit (18); - a second cooling unit (24,28), comprising a hot methane inlet (25) and a cold methane outlet (26), wherein said hot methane inlet (25) is fluidly connected to said crude methane outlet (23) of the methanation unit (21); wherein said first cooling unit and said second cooling unit independently comprise an economizer, an evaporator and/or a super-heater for steam production for the gasifier. Further does the invention also provide a process for the conversion of carbonaceous material in methane using such methanation system.