Flue gas recycle method for thermochemical regeneration

A method of carrying out combustion in a furnace, comprising

• (A) combusting fuel in a furnace to produce gaseous combustion products, and
• (B) alternately
• (1) passing gaseous combustion products from the furnace into and through a cooled first regenerator to heat the first regenerator and cool said gaseous combustion products, and injecting a stream of gaseous fuel into a recycle stream comprising said gaseous combustion products cooled in said first regenerator, to entrain said recycle stream into said injected stream of gaseous fuel thereby forming a mixture of the gaseous fuel with said entrained gaseous combustion products and to impel the mixture into a heated second regenerator, ad feeing additional gaseous fuel into the mixture of gaseous fuel with entrained gaseous combustion products before the mixture is impelled into the heated second regenerator and, in the second regenerator, reacting the gaseous combustion products and the fuel in said mixture in an endothermic reaction to form syngas comprising hydrogen and CO, and passing said syngas from the second regenerator into the furnace and combusting it in the furnace, and
• (2) passing gaseous combustion products from the furnace into and through a cooled second regenerator to heat the second regenerator and cool said gaseous combustion products, and injecting a stream of gaseous fuel into a recycle stream comprising said gaseous combustion products cooled in said second regenerator, to entrain said recycle stream into said injected stream of gaseous fuel thereby forming a mixture of the gaseous fuel with said entrained gaseous combustion products and to impel the mixture into a heated first regenerator, and feeding additional gaseous fuel into the mixture of gaseous fuel with entrained gaseous combustion products before the mixture is impelled into the heated first generator and, in the first regenerator, reacting the gaseous combustion products and the fuel in said mixture in an endothermic reaction to form syngas comprising hydrogen and CO, and passing said syngas from the first regenerator into the furnace and combusting it in the furnace.