Method of manufacturing synthesis gas

A method of manufacturing a synthesis gas by using a synthesis plant comprising a reformer and a preliminary reformer which is provided on the upstream side of said reformer, said reformer comprising a steam reforming reaction tube, a combustion radiation portion provided around said reaction tube, for heating said reaction tube by combusting fuel, and a convection portion communicating said combustion radiation portion, and said method comprising the steps of;

• adding steam to a natural gas to prepare a stream-containing natural gas;
• passing said stream-containing natural gas through said convection portion of said reformer, thereby preheating said stream-containing natural gas;
• feeding said stream-containing natural gas preheated via said preliminary reformer to said reaction tube;
• preheating carbon dioxide by passing said carbon dioxide through said convection portion of said reformer;
• and
• feeding said carbon dioxide preheated via a passageway, which is located between said reaction tube and said preliminary reformer and passed said stream-containing natural gas preheated, to said reaction tube, thereby producing a synthesis gas containing hydrogen and carbon monoxide.

A method of manufacturing a synthesis gas by using a synthesis plant comprising a reformer and a partial oxidation furnace which is provided on the downstream side of said reformer, said reformer comprising a steam reforming reaction tube, a combustion radiation portion provided around said reaction tube, for heating said reaction tube by combusting fuel, and a convection portion communicating said combustion radiation portion, and said method comprising the steps of;

• adding steam to a natural gas to prepare a stream-containing natural gas;
• passing the stream-containing natural gas through the convection portion of the reformer, thereby preheating said stream-containing natural gas;
• preheating carbon dioxide by passing said carbon dioxide through said convection portion of said reformer;
• feeding said stream-containing natural preheated gas and said carbon dioxide preheated to said reaction tube, thereby producing a synthesis gas containing hydrogen and carbon monoxide;
• introducing said synthesis gas into said partial oxidation furnace;
• and
• introducing gas containing oxygen into said partial oxidation furnace, thereby allowing a reaction to take place between said synthesis gas and said oxygen.

A method of manufacturing a synthesis gas by using a synthesis plant comprising a reformer, a preliminary reformer which is disposed on the upstream side of said reformer, and a partial oxidation furnace which is provided on the downstream side of said reformer, said reformer comprising a steam reforming reaction tube, a combustion radiation portion provided around said reaction tube, for heating said reaction tube by combusting fuel, and a convection portion communicating said combustion radiation portion, and said method comprising the steps of;

• adding steam to a natural gas to prepare a stream-containing natural gas;
• passing the stream-containing natural gas through the convection portion of the reformer, thereby preheating said stream-containing natural gas;
• feeding said stream-containing natural gas preheated via said preliminary reformer to said reaction tube;
• preheating carbon dioxide by passing said carbon dioxide through said convection portion of said reformer;
• feeding said carbon dioxide preheated via a passageway, which is located between said reaction tube and said preliminary reformer and passed said stream-containing natural gas preheated, to said reaction tube, thereby producing a synthesis gas containing hydrogen and carbon monoxide;
• introducing said synthesis gas into said partial oxidation furnace;
• and
• introducing gas containing oxygen into said partial oxidation furnace, thereby allowing a reaction to take place between said synthesis gas and said oxygen.