This study proposed a reactor concept for CO2 methanation, aiming to realize high CO2 conversion (>= 99%) and high heat recovery rate under low pressure and thermally self-sustained conditions. The reactor has two stages with intermediate removal of water, and the portion of H-2 is supplied at the second-stage reactor inlet while CO2 is provided only at the first-stage reactor inlet. The heat carrier flows directly from the first-stage reactor outlet to the second-stage reactor inlet, and the heat carrier path also branches between the first and second stages, resulting in a reduced heat carrier flow rate in the second stage. The efficacy of the concept was evaluated at 200 kPa (G). The results show that both stages of the reactor can he thermally self-sustained by feeding H-2 stepwise, a high CO2 conversion (>= 99%) can be achieved by directly providing the heat carrier, and the heat recovery rate can be improved by branching the heat carrier path between the first and second stages. The responses of the conversion and the heat recovery rate at each stage to variation of the operational parameters (H-2 provision rate and heat carrier flow rate at each stage) were also examined. The results show that, in order to simultaneously achieve high CO2 conversion and heat recovery rate, CO2 conversion is required to be established with lowering the inlet heat carrier temperature in the second-stage reactor.