Steam generator comprising successive combustion chambers

Abstract

A steam generator includes at least two successive combustion hearths with at least one burner supplied with fuel and oxidizer, a vaporization zone comprising a vaporization exchanger, a superheating zone comprising a superheating exchanger, a preheating zone comprising a preheating exchanger and a collecting drum, Each hearth includes at least one vaporization exchanger.

1 ) A steam generator comprising at least two successive combustion hearths with at least one burner supplied with fuel and oxidizer, a vaporization zone comprising a vaporization exchanger, a superheating zone comprising an superheating exchanger, a preheating zone comprising a preheating exchanger and a collecting drum, characterized in that each hearth comprises at least one vaporization exchanger.  
   
   
       2 ) A steam generator as claimed in  claim 1 , characterized in that each hearth comprises at least one superheating exchanger.  
   
   
       3 ) A steam generator as claimed in  claim 1 , characterized in that each hearth comprises at least one preheating exchanger.  
   
   
       4 ) A steam generator as claimed in  claim 1 , characterized in that one of the hearths comprises at least one vaporization exchanger and in that the other hearth comprises at least one superheating exchanger.  
   
   
       5 ) A steam generator as claimed in  claim 1 , characterized in that one of the hearths comprises at least one vaporization exchanger and in that the other hearth also comprises at least one superheating exchanger and at least one preheating exchanger.  
   
   
       6 ) A steam generator as claimed in  claim 1 , characterized in that one of the hearths comprises at least one vaporization exchanger and at least one superheating exchanger and in that the other hearth also comprises at least one superheating exchanger and at least one preheating exchanger.  
   
   
       7 ) A steam generator as claimed in  claim 1 , characterized in that it comprises a fumes depollution chamber intended for the fumes coming from combustion hearths.  
   
   
       8 ) A steam generator as claimed in  claim 7 , characterized in that the fumes depollution chamber is arranged upstream from the preheating zone.  
   
   
       9 ) A steam generator as claimed in  claim 7 , characterized in that the fumes depollution chamber comprises absorbent injection means.  
   
   
       10 ) A steam generator as claimed in  claim 7 , characterized in that the fumes depollution chamber comprises reducing agent injection means.  
   
   
       11 ) A steam generator as claimed in  claim 7 , characterized in that the fumes depollution chamber comprises at least one vaporization zone.  
   
   
       12 ) A steam generator as claimed in  claim 9 , characterized in that the absorbent is of calcic or magnesian type.  
   
   
       13 ) A steam generator as claimed in  claim 10 , characterized in that the reducing agent is of urea or ammonia type.  
   
   
       14 ) A steam generator as claimed in  claim 1 , characterized in that the oxidizer is a high oxygen content oxidizer.  
   
   
       15 ) A steam generator as claimed in  claim 1 , characterized in that the fuel is a solid, liquid or gaseous fuel, such as heavy fuel oil, a petroleum residue, a gas, oil coke or coal.  
   
   
       16 ) A steam generator as claimed in  claim 1 , characterized in that the walls of at least one hearth consist of a shell.  
   
   
       17 ) A steam generator as claimed in  claim 1 , characterized in that the walls of at least one hearth consist of membrane walls.