Method for treating carbon dioxide-containing waste gas

Abstract

A hydrocarbon-containing gas is guided to waste gas containing carbon dioxide and the carbon dioxide is at least partially converted into carbon monoxide and hydrogen when reacted with the hydrocarbon. The waste gas is used with the carbon monoxide hydrogen mixture for an additional combustion process.

1 - 11 . (canceled) 
     
     
         12 . A method for treating a carbon dioxide-containing waste gas, comprising:
 supplying a hydrocarbon-containing gas to the waste gas;   converting at least some of the carbon dioxide of the waste gas in a reaction into a carbon monoxide and hydrogen mixture; and   supplying the carbon monoxide and hydrogen mixture to a combustion process.   
     
     
         13 . The method as claimed in  claim 12 , wherein the reaction in said converting of the carbon dioxide in the waste gas is endothermic with the hydrocarbon-containing gas and the waste gas cooled down as a result of the reaction. 
     
     
         14 . The method as claimed in  claim 13 , wherein the hydrocarbon-containing gas includes methane. 
     
     
         15 . The method as claimed in  claim 14 , wherein the waste gas accumulates in a steelmaking process. 
     
     
         16 . The method as claimed in  claim 15 , wherein waste gas accumulates in a converter in which the carbon content in molten iron is reduced. 
     
     
         17 . The method as claimed in  claim 16 , further comprising adding water to the waste gas in addition to the hydrocarbon-containing gas. 
     
     
         18 . The method as claimed in  claim 17 , further comprising
 monitoring the carbon dioxide in the waste gas by a gas sensor; and   regulating said supplying of the hydrocarbon-containing gas based on said monitoring of the carbon dioxide content of the waste gas.   
     
     
         19 . The method as claimed in  claim 18 , wherein a collar is provided on the converter to avoid ingestion of inleaked air. 
     
     
         20 . The method as claimed in  claim 19 , further comprising storing the carbon monoxide and hydrogen mixture temporarily in a gas container. 
     
     
         21 . The method as claimed in  claim 20 , wherein the carbon monoxide and hydrogen mixture is used as a fuel gas in the combustion process. 
     
     
         22 . The method as claimed in  claim 21 , wherein said supplying of the hydrocarbon-containing gas occurs during at least one of a rampup process and a rampdown process of the converter.