Verfahren zur Gewinnung von unverbranntem Abgas aus Sauerstoffaufblaskonvertern

摘要

Combustible waste gas produced during refing of pig iron in an oxygen top blowing converter 1 from which the waste gas is drawn by an induced draft fan 9 through a gas cooler 6 having a vertically movable skirt 4 spaced above the converter with an inert gas curtain 2 provided to seal the gap, is recovered in an unburnt state when the CO content reaches a predetermined value by lowering the skirt and applying the inert gas curtain to seal the gap, maintaining a positive pressure within the cooler, cleaning the isolated waste gas, e.g. through dust collector 7, and storing the cleaned waste gas in a gas holder 10. During the initial and final stages of blowing when the CO content of the waste gas is below the predetermined value, a negative pressure is maintained within the cooler and the skirt is raised to induce air into the cooler through the widened gap, preferably in an amount in excess of that required for complete combustion, the burnt gas being discharged into the atmosphere. Specification 950,072 is referred