Method and apparatus for recovering waste gas from oxygen top blowing converter in unburned state

Claim 1

A METHOD OF RECOVERING IN A WASTE GAS COLLECTING SYSTEM THE UNBURNED COMBUSTIBLE WASTE GAS PRODUCED BY BLOWING PURE OXYGEN INTO AN OXYGEN TOP BLOWING CONVERTER FOR REFINING MOLTEN PIG IRON, SAID METHOD COMPRISING THE STEPS OF MIXING INTO THE WASTE GAS PRODUCED AT THE START OF THE OXYGEN BLOWING IN THE CONVERTER AN AMOUNT OF AN INERT GAS SUFFICIENT TO BRING THE TOTAL AMOUNT OF GAS UP TO 1/5-1/3 THE MAXIMUM AMOUNT OF GAS GENERATED IN THE CONVERTER FOR MAINTAINING SUFFICIENT GAS FLOW FOR KEEPING THE COLLECTION SYSTEM STABLE AND DILUTING THE GAS FROM THE CONVERTER SUFFICIENTLY TO MINIMIZE THE HAZARD OF AN EXPLOSION, GRADUALLY DECREASING THE AMOUNT OF INERT GAS ADDED TO THE WASTE GAS AS THE AMOUNT OF WASTE GAS FROM THE CONVERTER INCREASES UNTIL THE AMOUNT OF CO PRESENT IN THE WASTE GAS COMING FROM THE CONVERTER RISES TO A PREDETERMINED MINIMUM, DISCHARGING THE MIXTURE OF WASTE GAS AND INERT GAS INTO THE ATMOSPHERE, DISCONTINUING THE MIXTURE OF THE INERT GAS WHEN THE AMOUNT OF CO PRESENT IN THE WASTE GAS FROM THE CONVERTER REACHES SAID PREDETERMINED MINIMUM AND THEN COLLECTING THE WASTE GAS PRODUCED IN THE CONVERTER DURING THE TIME THE AMOUNT OF CO REMAINS ABOVE THE SAID PREDETERMINED MINIMUM, AND WHEN THE AMOUNT OF CO IN THE WASTE GAS DROPS BELOW SAID PREDETERMINED MINIMUM, ADDING AN INERT GAS TO THE WASTE GAS IN GRADUALLY INCREASING AMOUNTS UP TO SAID 1/5-1/3 THE MAXIMUM AMOUNT OF GENERATED GAS FOR KEEPING THE COLLECTION SYSTEM STABLE UNTIL THE END OF THE OXYGEN BLOWING IN THE CONVERTER AND DISCHARING SAID MIXTURE OF INERT GAS AND WASTE GAS TO THE ATMOSPHERE.

Claim 2

A METHOD OF RECOVERING IN A WASTE GAS COLLECTING SYSTEM THE UNBURNED COMBUSTIBLE WASTE GAS PRODUCED BY BLOWING PURE OXYGEN INTO AN OXYGEN TOP BLOWING CONVERTER FOR REFINING MOLTEN PIG IRON, SAID METHOD COMPRISING THE STEPS OF MIXING INTO THE WASTE GAS PRODUCED AT THE START OF THE OXYGEN BLOWING IN THE CONVERTER AN AMOUNT OF AN INERT GAS SUFFICIENT TO BRING THE TOTAL AMOUNT OF GAS UP TO 1/5-1/3 THE MAXIMUM AMOUNT OF GAS GENERATED IN THE CONVERTER FOR MAINTAINING SUFFICIENT GAS FLOW FOR KEEPING THE COLLECTION SYSTEM STABLE AND DILUTING THE GAS FROM THE CONVERTER SUFFICIENTLY TO MINIMIZE THE HAZARD OF AN EXPLOSION, GRADUALLY DECREASING THE AMOUNT OF INERT GAS ADDED TO THE WASTE GAS AS THE AMOUNT OF WASTE GAS FROM THE CONVERTER INCREASES UNTIL THE AMOUNT OF CO PRESENT IN THE WASTE GAS COMING FROM THE CONVERTER RISES TO A PREDETERMINED MINIMUM, DISCHARGING THE MIXTURE OF WASTE GAS AND INERT GAS INTO THE ATMOSPHERE, DISCONTINUING THE MIXTURE OF THE INERT GAS WHEN THE AMOUNT OF CO PRESENT IN THE WASTE GAS FROM THE CONVERTER REACHES SAID PREDETERMINED MINIMUM AND THEN COLLECTING THE WASTE GAS PRODUCED IN THE CONVERTER DURING THE TIME THE AMOUNT OF CO REMAINS ABOVE THE SAID PREDETERMINED MINIMUM, AND WHEN THE AMOUNT OF CO IN THE WASTE GAS DROPS BELOW SAID PREDETERMINED MINIMUM, ADDING AN INERT GAS TO THE WASTE GAS IN GRADUALLY INCREASING AMOUNTS UP TO SAID 1/5-1/3 THE MAXIMUM AMOUNT OF GENERATED GAS FOR KEEPING THE COLLECTION SYSTEM STABLE UNTIL THE END OF THE OXYGEN BLOWING IN THE CONVERTER AND DISCHARING SAID MIXTURE OF INERT GAS AND WASTE GAS TO THE ATMOSPHERE.