NOVELTY - Reaction system comprises a reactor (100), a synthetic gas inlet (101) arranged on one end of the reactor, an outlet of gas containing sufficient methane arranged on the other end of the reactor, at least one reaction adsorption region (105) having a single stone passage structure arranged between the synthetic gas inlet and the outlet of gas containing sufficient methane, methanation reaction catalyst, gas-solid separator (111) used for separating the waste adsorbent generated in the reactor from the gas containing sufficient methane, and at least one adsorbent regenerator (200).    USE - The reaction system is useful for producing gas containing sufficient methane.    DETAILED DESCRIPTION - Reaction system comprises a reactor (100), a synthetic gas inlet (101) arranged on one end of the reactor, an outlet of gas containing sufficient methane arranged on the other end of the reactor, at least one reaction adsorption region (105) having a single stone passage structure arranged between the synthetic gas inlet and the outlet of gas containing sufficient methane, methanation reaction catalyst coated or loaded on the wall of the passage, gas-solid separator (111) used for separating the waste adsorbent generated in the reactor from the gas containing sufficient methane, and at least one adsorbent regenerator (200) connected with the reactor through the gas-solid separator, the waste adsorbent conveying pipeline and the regenerated adsorbent conveying pipeline. The gas-solid mixture of the synthetic gas and the adsorbent for adsorbing carbon dioxide and sulfide gas passes the reaction adsorption region, the synthetic gas performs methanation reaction under the action of the methanation reaction catalyst when passing the reaction adsorption region, the adsorbent adsorbs carbon dioxide and sulfide gas from the synthetic gas and the carbon dioxide generated in the methanation reaction. The waste adsorbent generated in the reactor is separated from the gas containing sufficient methane in the gas-solid separator and is conveyed to the adsorbent regenerator through the waste adsorbent conveying pipeline, and the regenerated adsorbent is circulated to the reactor by the regenerated adsorbent conveying pipeline. An INDEPENDENT CLAIM is also included for producing gas containing sufficient methane through the system, comprising: filling the synthetic gas containing carbon monoxide, carbon dioxide, hydrogen, sulfide and vapor in the reactor through the synthetic gas inlet; mixing the synthetic gas in the synthetic gas inlet with the fresh and/or regenerated adsorbent in the adsorbent regenerator to form gas-solid mixture of the synthetic gas and the adsorbent; passing the gas-solid mixture through the reaction adsorption region having a single stone passage structure, adsorbing carbon dioxide and sulfide gas from the synthetic gas by the adsorbent to be removed or reduced, performing methanation reaction by the synthetic gas under the action of the methanation reaction catalyst coated or loaded on the wall surface of the passage to generate methane, carbon dioxide and water, adsorbing carbon dioxide generated in the reaction quickly by the adsorbent to be removed or reduced; separating the mixture of the gas containing sufficient methane and the waste adsorbent granules with separated carbon dioxide and sulfide gas by the gas-solid separator before or after leaving the reactor through the outlet of gas containing sufficient methane; conveying the separated waste adsorbent to the adsorbent regenerator by the waste adsorbent conveying pipeline, reacting the waste adsorbent entering the adsorbent regenerator with air flow containing oxygen at 500-1200 degrees C to be converted to generate adsorbent; circulating the generated adsorbent to the reactor through the regenerated adsorbent conveying pipeline.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the reaction system for producing gas containing sufficient methane.    Reactor (100)    Synthetic gas inlet (101)    Reaction adsorption region (105)    Gas-solid separator (111)    Adsorbent regenerator (200)