The invention belongs to the technical field of energy and
chemical industry and discloses a method and a device for preparing
methane-enriched gas from carbon-containing raw materials. By the circulation of
solid particles used as both heat carriers and catalysts, the decoupling-optimizing control reintegration of the gasification of the carbon-containing raw materials and the
methanation process of gasification products are achieved so as to obtain the
methane-enriched gas, the direct conversion of
solid carbon-containing raw materials to the
methane-enriched gas is achieved and the device cost and the
operating cost are decreased. By the heat-carrying functions of the
solid heat carriers and the catalysts, the high conversion rate of the
methanation process in a single-section adiabatic reactor is achieved, the circulation of a large number of
product gas and multi-section
methanation adopted in the conventional fixed-
bed methanation process are avoided and the production cost is decreased. The catalysts has the characteristics of in-situ regeneration, convenience in renewal and the like, and thus the requirements of the process on such performances as
sulfur tolerance,
carbon deposition resistance and service life are greatly reduced.