Process for producing synthesis gas product comprising hydrogen

A process for producing a synthesis gas product by an endothermic reaction of a feedstock stream, comprising:

• providing an ammonia fuel stream,
• performing a first combustion in which the ammonia fuel stream is partially burned, generating heat and a combustion flue gas stream comprising an unburned portion of ammonia fuel stream being not burned,
• providing heat from the first combustion and from the combustion flue gas stream to the endothermic reaction, thereby obtaining a cooled flue gas stream,
• performing a second combustion of the cooled flue gas stream in which the unburned portion of ammonia fuel stream is burned,
• providing heat from the second combustion to the endothermic reaction.

A furnace for producing a synthesis gas product by an endothermic reaction of a feedstock stream, said furnace comprising:

• a firing chamber comprising at least one burner arranged for an ammonia fuel stream combustion,
• a least one reactor configured to produce synthesis gas product by an endothermic reaction of a feedstock stream, said reactors being arranged to be heated by the firing chamber,
• a first distribution manifold configured to feed the firing chamber with a first oxidant flow for burning partially the ammonia fuel stream and generate a flue gas stream comprising an unburned portion of ammonia,
• a second distribution manifold configured to feed the firing chamber with a second oxidant flow for combusting the unburned ammonia.