| 摘要 |
<p>The invention relates to a method for making a methane-rich gas from synthesis gas. This necessitates a method in which a synthesis gas (4) containing CO and H2 is mixed with a gas stream (8) that is diverted from the methane-rich product gas and returned thereto, and is then passed through a catalyst bed (1) consisting of a methanation catalyst, wherein methanation takes place in the catalyst bed (1) and the gas stream is heated by released reaction heat. According to the invention, the catalyst bed (1) is divided into several methanation stages (2.1 to 2.4) through which the gas flows one after the other, and the synthesis gas (4) is split correspondingly into partial streams (4.1 to 4.4), each of which is fed to the catalyst bed (1) of an assigned methanation stage (2.1 to 2.4). The gas (6.1 to 6.3) that exits a methanation stage, and that has been heated up by methanation reactions in this stage is mixed with the partial stream of synthesis gas (4.2 to 4.4) for the following methanation stage, and is cooled thereby. The resulting mixed gas stream is fed to the catalyst bed in the subsequent methanation stage as feed gas.</p> |
