Staged Oxyfuel Combustion Method Using Pre-Heated Reagents

Abstract

The invention relates to a staged oxyfuel combustion method in which a combustion chamber is injected with a jet of fuel inside a jet of primary oxygen gas which is introduced through a hole having a diameter D and a secondary oxygen gas which is introduced through a hole having a diameter d, which is positioned at a distance l from the hole for the primary oxygen gas. According to the invention, the jet of fuel emerges at a distance r set back from the wall of the combustion chamber. The oxygen-rich oxygen gas is pre-heated to a temperature of at least 300° C. The r/D ratio is between 5 and 20 or between 0.75 and 3 and the l/d ratio is at least 2.

1 - 7 . (canceled) 
   
   
       8 . A process for burning a fuel using an oxygen-rich oxygenated gas in which the following are injected into a combustion chamber:
 a jet of the fuel; and   at least two jets of the oxygenated gas:
 the first jet of the oxygenated gas, called the primary jet, being introduced via an orifice having a diameter D and being injected around the jet of fuel and in an amount such that it causes a first incomplete combustion, the gases resulting from this first combustion still comprising at least some of the fuel and 
 the second jet of the oxygenated gas, being introduced via an orifice having a diameter d, placed at a distance l from the orifice for introducing the first, primary jet of oxygenated gas, so as to enter into combustion with that part of the fuel present in the gases resulting from the first combustion; 
   
     and in which:
 the jet of the fuel emerges within the primary jet of oxygenated gas at a point set back from the wall of the combustion chamber, said point being located at a distance r therefrom; 
 the oxygen-rich oxygenated gas is preheated to a temperature of at least 300° C., 
 
     and wherein:
 the r/D ratio is:
 either between 5 and 20; 
 or between 0.75 and 3; and 
 
 the l/d ratio is at least 2. 
 
   
   
       9 . The process of  claim 8 , wherein the r/D ratio is between 7 and 15. 
   
   
       10 . The process of  claim 8 , wherein the l/d ratio is at least 10. 
   
   
       11 . The process of  claim 8 , wherein the oxygen-rich oxygenated gas has an oxygen concentration of at least 70% by volume. 
   
   
       12 . The process of  claim 8 , wherein the fuel is preheated to at least 300° C. 
   
   
       13 . The process of  claim 8 , wherein said process is employed in a glass melting furnace. 
   
   
       14 . The process of  claim 8 , wherein said process is employed in a reheating furnace. 
   
   
       15 . The process of  claim 9 , wherein the l/d ratio is at least 10. 
   
   
       16 . The process of  claim 15 , wherein the oxygen-rich oxygenated gas has an oxygen concentration of at least 70% by volume. 
   
   
       17 . The process of  claim 16 , wherein the fuel is preheated to at least 300° C. 
   
   
       18 . The process of  claim 17 , wherein said process is employed in a glass melting furnace. 
   
   
       19 . The process of  claim 17 , wherein said process is employed in a reheating furnace. 
   
   
       20 . The process of  claim 15 , wherein said process is employed in a glass melting furnace. 
   
   
       21 . The process of  claim 15 , wherein said process is employed in a reheating furnace. 
   
   
       22 . The process of  claim 16 , wherein said process is employed in a glass melting furnace. 
   
   
       23 . The process of  claim 16 , wherein said process is employed in a reheating furnace.