Blast furnace operation

• US 2,593,257 A
• Filed: 08/26/1948
• Issued: 04/15/1952
• Est. Priority Date: 08/26/1948
• Status: Expired due to Term

• Current Assignee: Henry J. Ogorzaly, John M. Bradley
• Original Assignee: Henry J. Ogorzaly, John M. Bradley
• Inventors: Bradley, John M., Ogorzaly, Henry J.
• Application Number:
  US03/046,244
• Time in Patent Office: 1,328 Days
• US Class Current: 75/460
• CPC Class Codes: C21B 2100/22 by reforming
• CPC Class Codes: C21B 2100/44 Removing particles, e.g. by scrubbing, dedusting
• CPC Class Codes: C21B 5/001 Injecting additional fuel or reducing agents
• CPC Class Codes: C21B 5/06 using top gas in the blast furnace process in coke ovens C10B
• CPC Class Codes: Y02P 10/25 Process efficiency
• CPC Class Codes: Y10S 48/02 Slagging producer

Claims

1. IN THE PRODUCTION OF PIG IRON FROM IRON OXIDES IN A BLAST FURNACE WHEREIN A CHARGE COMPRISING A MIXTURE OF IRON OXIDE ARE, FLUXING MATERIALS AND CARBONACEOUS SOLIDS IS CHARGED TO THE TOP OF SAID BLAST FURNACE, A BLAST CONTAINING A MIXTURE OF OXYGEN AND STEAM IS SUPPLIED TO A LOWER PORTION OF SAID BLAST FURNACE, A GAS IS WITHDRAWN FROM THE TOP OF THE BLAST FURNACE, AND MOLTEN PIG IRON AND SLAG ARE WITHDRAWN FROM THE BOTTOM OF THE BLAST FURNACE, THE IMPROVEMENT WHICH COMPRISES SUPPLYING OXYGEN AND STEAM IN THE APPROXIMATE MOLAR PROPORTION OF 0.5-2 TO 1, CONTROLLING THE AMOUNT OF SAID OXYGEN SO THAT IT SUPPLIES BY REACTION WITH COMBUSTIBLE MATTER PRESENT IN SAID BLAST FURNACE SUFFICIENT HEAT TO SUPPORT SUBSTANTIALLY COMPLETE SMELTING OF SAID IRON OXIDE AND SUBSTANTIAL REDUCTION OF SAID STEAM TO HYDROGEN IN THE PRESENCE OF CARBON, SO AS TO FORM A GAS RICH IN CO AND H2, MAINTAINING THE TEMPERATURE IN AN UPPER PORTION PASSED THROUGH BY BOTH CHARGE AND SAID GAS CONTAINING CO AND H2 AT A LEVEL OF ABOUT 500* TO 800* F., CONTACTING IN SAID UPPER PORTION SAID GAS CONTAINING H2 AND CO WITH SAID CHARGE FOR A TIME CONDUCTIVE TO THE SYNTHESIS OF HYDROCARBONS FROM SAID CO AND H2 IN CONTACT WITH IRON OF SAID IRON OXIDE, AND RECOVERING A GAS CONTAINING HYDROCARBONS FROM SAID UPPER PORTION.