Natural gas reforming system and process thereof

A natural gas reforming system comprising:

• a reformer configured to convert, through a steam reforming reaction, natural gas into reformed gas that comprises hydrogen and carbon monoxide;
• a steam generator configured to generate steam by heat-exchanging with combustion gas that is discharged from a burner of the reformer;
• a water gas shift reactor configured to convert the carbon monoxide and steam of the reformed gas into hydrogen and carbon dioxide through a water gas shift reaction;
• a hydrogen separator configured to separate the hydrogen from the gas supplied from the water gas shift reactor;
• a carbon dioxide separator configured to separate the carbon dioxide from the gas which is supplied by the hydrogen separator and from which the hydrogen has been separated;
• and
• a co-electrolysis device configured to be supplied with the steam and the carbon dioxide separated by the carbon dioxide separator and to produce oxygen and syngas comprising hydrogen and carbon monoxide, through a co-electrolytic reaction,
• wherein at least a portion of the syngas produced by the co-electrolysis device is supplied to the burner of the reformer and is combusted, and
• wherein the rest of the syngas produced by the co-electrolysis device is supplied to a front end of the water gas shift reactor.