| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing hydrogen by an energetically advantageous dry reforming process where the release amount of carbon dioxide into the air is reduced, and a production system therefor.SOLUTION: There is provided a production system X comprising: a dry reforming device 1 for obtaining a modified gas including hydrogen and carbon monoxide from a hydrocarbon based raw material gas and carbon dioxide; a carbon monoxide conversion device 3 for obtaining a mixed gas including hydrogen and carbon dioxide from the modified gas and water vapor; a hydrogen PSA device 4 for concentrating hydrogen from the mixed gas so as to be recovered; a carbon dioxide separator 5 for separating the carbon dioxide from an off gas derived after the hydrogen recovery in the hydrogen PSA device 4; and a recycle line L7 for adding a carbon dioxide-enriched gas having a carbon dioxide concentration higher than that of the off gas passed through the carbon dioxide separator 5 to the raw material gas before being fed to the dry reforming device 1.SELECTED DRAWING: Figure 1 |
