Patent ID: 9000056
Filing Date: 2015-04-07
Classification: C10J,C10K,C10L

Abstract:
1. A process for preparing methane by catalytically gasifying coal, comprising the following steps: (a) providing a gasifier comprising a syngas generation section, a coal methanation section and a syngas methanation section, and carrying out methanation reaction by reacting the coal with a syngas-including gas stream coming from the syngas generation section in the presence of coal methanation catalyst in the coal methanation section, so as to generate a methane-containing gas stream and reacted char; (b) the reacted char enters downwardly the syngas generation section and reacts with a gaseous oxidant introduced into the syngas generation section, producing the syngas-including gas stream and ash residues, wherein the syngas-including gas stream enters upwardly the coal methanation section to carry out step (a), while the ash residues exit the gasifier; and, (c) the methane-containing gas stream from step (a) enters upwardly the syngas methanation section, and the syngas is subjected to methanation reaction in the presence of a syngas methanation catalyst to produce additional methane, so as to obtain a gaseous product containing more methane; wherein solid materials move from top to bottom, and finally exit the gasifier via an ash residue exit at the bottom of the gasifier, while gaseous materials move from bottom to top, and finally exit the gasifier via a gas exit at the top of the gasifier; in the gasifier the solid materials contact with the gaseous materials basically in counter current mode.