Method of recovering an unburnt waste gas produced in an oxygen top-blowing converter

Claim 1

A METHOD OF RECOVERING IN A GAS RECOVERY SYSTEM UNBURNED WASTE GAS ISSUING FROM AN OXYGEN TOP-BLOWING CONVERTER DURING THE REFINING OF MOLTEN PIG IRON IN THE CONVERTER BY BLOWING OXYGEN INTO SAID CONVERTER, COMPRISING THE STEPS OF POSITIVELY INTRODUCING AIR INTO THE WASTE GAS FLOWING FROM THE CONVERTER INTO THE RECOVERY SYSTEM DURING THE INITIAL PERIOD OF BLOWING WHILE THE CO CONTENT OF THE WASTE GAS IS BELOW THE DESIRED VALUE, THE AIR BEING INTRODUCED IN AN AMOUNT IN EXCESS OF THAT NECESSARY FOR BURNING THE WASTE GAS AND IN AN AMOUNT WHICH WHEN COMBINED WITH THE PRODUCTS OF COMBUSTION PRODUCES A GAS FLOW AT A LEVEL SUBSTANTIALLY ABOVE THE AMOUNT OF WASTE GAS FLOWING FROM THE CONVERTER AT THE END OF SAID INITIAL PERIOD AND SUFFICIENT TO EFFECTIVELY CONTROL THE PRESSURE WITHIN THE GAS RECOVERY SYSTEM BY MEANS OF A DAMPER INSTALLED IN THE RECOVERY SYSTEM, DISCHARGING BURNED GAS AND EXCESS AIR FROM THE RECOVERY SYSTEM; THEN WHEN THE CO CONTENT OF THE WASTE GAS REACHES THE DESIRED VALUE, PREVENTING THE ENTRY OF AIR INTO THE GAS FROM THE CONVERTER FLOWING INTO THE RECOVERY SYSTEM, THEM IN TRODUCING AN INERT GAS INTO THE GAS FLOWING FROM THE CONVERTER INTO THE RECOVERY SYSTEM IN AN AMOUNT SUFFICIENT TO MAINTAIN SAID LEVEL OF THE GAS FLOW, TERMINATING THE INPUT OF INERT GAS WHEN THE GAS FLOW FROM THE CONVERTER REACHES SAID LEVEL, RECOVERING THE WASTE GAS FLOWING FROM THE CONVERTR IN AN UNBURNED STATE STARTING JUST AFTER THE AIR IS EXCLUDED AND THE INTRODUCTION OF THEINERT GAS HAS STARTED AND THROUGHOUT THE MIDDLE PERIOD OF BLOWING; THEN JUST BEFORE TH FLOW OF GAS FROM THE CONVERTER FALLS BELOW THE SAID LEVEL, INTRODUCING INERT GAS INTO THE WASTE GAS IN AN AMOUNT SUFFICIENT OT MAINTAIN SAID LEVEL OF GAS FLOW, AND JUST BEFORE THE CO CONTENT OF THE WASTE GAS FALLS BELOW THE DESIRED VALUE, TERMINATING THE RECOVERY OF THE UNBURNED WASTE GAS AND NTRODUCING AIR INTO THE WASTE GAS FLOWING FROM THE CONVERTER INTO THE RECOVERY SYSTEM IN AN AMOUNT IN EXCESS OF THAT NECESSARY FOR BURNING THE WASTE GAS AND IN AN AMOUNT WHICH WHEN COMBINED WITH THE PRODUCTS OF COMBUSTION IS SUFFICIENT TO KEEP THE LEVEL OF GAS FLOW SUBSTANTIALLY ABOVE THE LEVEL OF WASTE GAS FLOW FROM THE CONVERTER AT THE END OF SAID MIDDLE PERIOD OF BLOWING, AND DISCHARGING THE COMBUSTION GAS AND EXCESS AIR FROM THE RECOVERY SYSTEM.

Claim 2

A METHOD OF RECOVERING IN A GAS RECOVERY SYSTEM UNBURNED WASTE GAS ISSUING FROM AN OXYGEN TOP-BLOWING CONVERTER DURING THE REFINING OF MOLTEN PIG IRON IN THE CONVERTER BY BLOWING OXYGEN INTO SAID CONVERTER, COMPRISING THE STEPS OF POSITIVELY INTRODUCING AIR INTO THE WASTE GAS FLOWING FROM THE CONVERTER INTO THE RECOVERY SYSTEM DURING THE INITIAL PERIOD OF BLOWING WHILE THE CO CONTENT OF THE WASTE GAS IS BELOW THE DESIRED VALUE, THE AIR BEING INTRODUCED IN AN AMOUNT IN EXCESS OF THAT NECESSARY FOR BURNING THE WASTE GAS AND IN AN AMOUNT WHICH WHEN COMBINED WITH THE PRODUCTS OF COMBUSTION PRODUCES A GAS FLOW AT A LEVEL SUBSTANTIALLY ABOVE THE AMOUNT OF WASTE GAS FLOWING FROM THE CONVERTER AT THE END OF SAID INITIAL PERIOD AND SUFFICIENT TO EFFECTIVELY CONTROL THE PRESSURE WITHIN THE GAS RECOVERY SYSTEM BY MEANS OF A DAMPER INSTALLED IN THE RECOVERY SYSTEM, DISCHARGING BURNED GAS AND EXCESS AIR FROM THE RECOVERY SYSTEM; THEN WHEN THE CO CONTENT OF THE WASTE GAS REACHES THE DESIRED VALUE, PREVENTING THE ENTRY OF AIR INTO THE GAS FROM THE CONVERTER FLOWING INTO THE RECOVERY SYSTEM, THEM IN TRODUCING AN INERT GAS INTO THE GAS FLOWING FROM THE CONVERTER INTO THE RECOVERY SYSTEM IN AN AMOUNT SUFFICIENT TO MAINTAIN SAID LEVEL OF THE GAS FLOW, TERMINATING THE INPUT OF INERT GAS WHEN THE GAS FLOW FROM THE CONVERTER REACHES SAID LEVEL, RECOVERING THE WASTE GAS FLOWING FROM THE CONVERTR IN AN UNBURNED STATE STARTING JUST AFTER THE AIR IS EXCLUDED AND THE INTRODUCTION OF THEINERT GAS HAS STARTED AND THROUGHOUT THE MIDDLE PERIOD OF BLOWING; THEN JUST BEFORE TH FLOW OF GAS FROM THE CONVERTER FALLS BELOW THE SAID LEVEL, INTRODUCING INERT GAS INTO THE WASTE GAS IN AN AMOUNT SUFFICIENT OT MAINTAIN SAID LEVEL OF GAS FLOW, AND JUST BEFORE THE CO CONTENT OF THE WASTE GAS FALLS BELOW THE DESIRED VALUE, TERMINATING THE RECOVERY OF THE UNBURNED WASTE GAS AND NTRODUCING AIR INTO THE WASTE GAS FLOWING FROM THE CONVERTER INTO THE RECOVERY SYSTEM IN AN AMOUNT IN EXCESS OF THAT NECESSARY FOR BURNING THE WASTE GAS AND IN AN AMOUNT WHICH WHEN COMBINED WITH THE PRODUCTS OF COMBUSTION IS SUFFICIENT TO KEEP THE LEVEL OF GAS FLOW SUBSTANTIALLY ABOVE THE LEVEL OF WASTE GAS FLOW FROM THE CONVERTER AT THE END OF SAID MIDDLE PERIOD OF BLOWING, AND DISCHARGING THE COMBUSTION GAS AND EXCESS AIR FROM THE RECOVERY SYSTEM.