Burner and method for implementing an oxycombustion

Abstract

The invention relates to a method of combustion of a fuel using an oxygen containing gas and at least one mainly inert gas, in which: the said oxygen containing gas comprises at least 80% of oxygen in volume, the said fuel and the said oxygen containing gas are injected in such a way as to create a flame, the said mainly inert gas is injected in such a way that it is contiguous to and surrounds the flame created by the said fuel and the said oxygen containing gas and that it has a divergent swirl with regard to the flame.

1 - 12 . (canceled) 
     
     
         13 . A method of combustion of at least one fuel using at least one oxygen containing gas and at least one mainly inert gas, comprising injecting the said mainly inert gas in such a way that the injected mainly inert gas is contiguous to and surrounds the flame created by combustion of the fuel and the oxygen containing gas and that the injected mainly inert gas has a divergent swirl with regard to the flame, wherein the oxygen containing gas comprises at least 80% of oxygen by volume. 
     
     
         14 . The method of  claim 13 , wherein the fuel is gaseous, liquid, solid, a slurry, an emulsion, solid in gas suspension, or any combination thereof. 
     
     
         15 . The method of  claim 13 , wherein 3 or more different fuels are simultaneously injected. 
     
     
         16 . The method of  claim 13 , wherein the fuel is injected through two or more orifices and the oxygen containing gas is injected through two or more orifices. 
     
     
         17 . The method of  claim 13 , wherein the oxygen containing gas is injected through two or more orifices. 
     
     
         18 . The method of  claim 13 , wherein the injection of the oxygen containing gas is staged between primary oxygen and secondary oxygen. 
     
     
         19 . The method of  claim 13 , wherein a single set of orifices is to inject two or more different fuels. 
     
     
         20 . The method of  claim 13 , wherein:
 the mainly inert gas essentially consists of recycled flue gas resulting from combustion of the fuel and the oxygen containing gas; and   a rate of recycling of the flue gas varies from 0.1 to 5.0, the rate of recycling being defined as a ratio (x/y) of a volume flowrate (x) of the flue gas that is recycled to the volume flowrate (y) of the flue gas that is not recycled.   
     
     
         21 . The method of  claim 13 , wherein:
 the mainly inert gas essentially consists of recycled flue gas resulting from combustion of the fuel and the oxygen containing gas; and   the flue gas temperature is maintained at a temperature greater than the acid dew point temperature.   
     
     
         22 . The method of  claim 13 , wherein the rate of recycling of the flue gas varies from 0.1 to 1.5. 
     
     
         23 . A burner comprising:
 at least one fuel tube adapted to inject fuel; and   at least one oxygen containing gas tube adapted to inject an oxygen containing gas comprising at least 80% of oxygen in volume, the fuel and oxygen containing gas tubes being placed with regard to one another in such a way that the oxygen containing gas and the fuel are capable of producing a flame upon injection;   a divergent swirler adapted to inject a mainly inert gas in the form of a divergently swirling jet contiguous to and surrounding a flame produced by combustion of the injected oxygen containing gas and fuel.   
     
     
         24 . A boiler comprising at least one of the burner according to  claim 23 . 
     
     
         25 . The method of  claim 13 , further comprising the step of utilizing the combustion of the fuel and the oxygen containing gas to produce at least one thermal fluid 
     
     
         26 . The method of  claim 25 , wherein the thermal fluid is selected from the group consisting of steam, hot water and hot oil. 
     
     
         27 . The method of  claim 13 , further comprising the step of utilizing the combustion of the fuel and the oxygen containing gas to produce electricity. 
     
     
         28 . The method of  claim 13  further comprising the step of utilizing the combustion of the fuel and the oxygen containing gas to produce mechanical work.