NOVELTY - Converting carbonaceous material to synthetic natural gas involves: pyrolyzing carbonaceous material in several vertically oriented tubes, at 400-650degreesC in a pyrolysis furnace (P); quenching product stream; passing gaseous and liquid fractions to separation zone (S1) and collecting gaseous fraction; passing portion liquid fraction to steam reforming zone (R) to produce synthetic gas, and at elevated temperature; passing it to heat recovery, solids recovery, organics removal, acid gas removal zones (AGS); and methanation process unit (M) to obtain product stream of methane.    USE - For converting carbonaceous material to synthetic natural gas, which is useful for producing methane and syngas (claimed).    ADVANTAGE - The method provides an improved and more efficient processes for converting a carbonaceous material (such as a biomass material e.g. wood) to synthetic natural gas; in which the material is first pyrolyzed, then subjected to steam reforming to produce a syngas, which is then passed to several clean-up steps, and then to a methanation zone to produce synthetic natural gas; as compared to the prior art methods. As compared to the prior art methods; which show various problems for pyrolyzing or gasifying carbonaceous materials; such as use of vessels that are cylindrical, or often wider or narrower at the grate level than at the surface of the fuel bed, relative to the flow of feed and the forced air (or other gases) draft, or other vessel constructions; which are unable to a high volume, precisely controlled, continuous process, so that the biomass fuel is efficiently converted to the target gas for supplying to additional energy or waste in the process; and/or exposing the base fuel during the pyrolysis to air, water vapor or other components results in a direct impact on the products of pyrolysis, by the temperature of the process and the duration. By using the prior art process of fluidized bed, which is, at least initially exposed to air and can be additionally exposed to oxygen, or other input gases, some portion of the fuel for gasification is consumed, as by oxidation (burning) affecting the output of the process by producing ash or other undesirable residue. The pyrolysis of the method is a fast pyrolysis that is a thermal decomposition process occurring at moderate temperatures with a high heat transfer rate to the carbonaceous particles and a short hot vapor residence time in the reaction zone. As compared to several conventional reactor configurations; such as bubbling fluid beds, circulating and transported beds, vortex or cyclonic reactors, or ablative reactors have a tendency of e.g. fluid bed reactors to produce more gas and coke than the desired pyrolysis oil; the pyrolysis reactor contains several vertically oriented straight tubes within the enclosed reactor vessel which is heated using heating device, and produces a liquid product, pyrolysis oil or bio-oil that can be readily stored and transported. Pyrolysis oil is a renewable liquid fuel that can be used for production of chemicals and liquid fuels, or for production of synthetic natural gas. The gaseous product collected from separation zone is a fuel gas, and a portion of which is used to fuel the pyrolysis unit, and/or the reforming zone. The heat recovery zone uses water to recover heat, and at least a portion of the heated water is used as preheated steam to the pyrolysis unit, and/or the reforming zone.    DETAILED DESCRIPTION - Converting carbonaceous material to synthetic natural gas involves:    (A) feeding the carbonaceous material and a superheated steam through several vertically oriented tubes, at 400-650degreesC in a pyrolysis furnace (P), for a time to produce a reaction product stream;    (B) quenching the reaction product stream to result in a gaseous fraction, a liquid fraction and a solids fraction;    (C) collecting at least a portion of the solids traction;    (D) passing the gaseous and liquid fractions of the reaction product stream to a separation zone (S1), in which the gaseous fraction is separated from the liquid fraction;    (E) collecting the gaseous fraction for further use;    (F) passing at least a portion of the liquid fraction and an amount of superheated steam to a reforming zone (R) at 850-1000degreesC and a pressure of 3-500 psig, where the liquid fraction is reformed to produce a synthetic gaseous product comprised of hydrogen, carbon monoxide, carbon dioxide, and methane, and at an elevated temperature;    (G) passing the synthetic gaseous product stream at an elevated temperature to a heat recovery zone, where its temperature is substantially lowered;    (H) passing the lowered temperature synthetic gaseous product stream to a solids recovery zone, where substantially all remaining solids are removed;    (I) passing the synthetic gaseous product stream having a reduced amount of solids to an organics removal zone, where remaining organic material is substantially removed by contact with an organic liquid in which the organic material is at least partially soluble;    (J) passing the synthetic gaseous product stream from the organics removal zone to an acid gas removal zone (AGS), where substantially all acid gases are removed;    (K) passing the synthetic gaseous product stream from the acid gas removal zone to a methanation process unit (M) containing at least one methanation catalyst and operated at methanation process conditions to result in a product stream comprised predominantly of methane.    DESCRIPTION OF DRAWING(S) - The figure shows a generalized flow scheme for converting carbonaceous material to synthetic natural gas.    Pyrolysis furnace (P)    Separation zone (S1)    Steam reforming zone (R)    Acid gas removal zone (AGS)    Methanation process unit. (M)