Methods and apparatus for carbon dioxide-oxygen-coal combustion

Abstract

A burner and method for oxidizing solid fuels wherein the burner has a lance having one or more nozzle feeds and one or more nozzle outlets concentrically surrounded by a primary oxidant passage which is concentrically surrounded by a secondary oxidant passage wherein the primary and secondary oxidant passages communicate at their proximal ends with a gas supply, the lance having a distal and proximal end and the one or more nozzle feeds is in communication with a gas supply.

1 . A burner for oxidizing solid fuels comprising a lance having one or more nozzle feeds and one or more nozzle outlets concentrically surrounded by a primary oxidant passage which is concentrically surrounded by a secondary oxidant passage wherein said primary and secondary oxidant passages communicate at their proximal ends with one or more gas supplies, said lance having a distal and proximal end and said one or more nozzle feeds is in communication with a gas supply. 
     
     
         2 . The burner as claimed in  claim 1  wherein said solid fuels are selected from the group consisting of coal, coke, peat, biomass and mixtures thereof. 
     
     
         3 . The burner as claimed in  claim 1  wherein said solid fuel is transported via a primary oxidant stream through said primary oxidant passages. 
     
     
         4 . The burner as claimed in  claim 3  wherein said primary oxidant stream has a volumetric oxygen content less than 32%. 
     
     
         5 . The burner as claimed in  claim 3  wherein said primary oxidant stream has a volumetric oxygen content less than 25%. 
     
     
         6 . The burner as claimed in  claim 3  wherein said primary oxidant stream has a volumetric oxygen content less than 21%. 
     
     
         7 . The burner as claimed in  claim 1  wherein a secondary oxidant stream is fed through said secondary oxidant passage. 
     
     
         8 . The burner as claimed in  claim 1  wherein said secondary oxidant stream has a volumetric oxygen content less than 40%. 
     
     
         9 . The burner as claimed in  claim 8  wherein said secondary oxidant stream has a volumetric oxygen content less than 30%. 
     
     
         10 . The burner as claimed in  claim 8  wherein said secondary oxidant stream has a volumetric oxygen content less than 28%. 
     
     
         11 . The burner as claimed in  claim 1  wherein said nozzles at said distal end of said lance is angled in a manner whereby discharge streams from said lance do not intercept an outer wall of said primary oxidant passage. 
     
     
         12 . The burner as claimed in  claim 3  wherein said nozzles at said distal end of said lance are positioned to direct oxygen into a flow path of said primary oxidant stream containing solid fuel. 
     
     
         13 . The burner as claimed in  claim 1  wherein said burner further comprises a quarl. 
     
     
         14 . The burner as claimed in  claim 13  wherein said nozzles at said distal end of said lance are arranged complimentary to said primary and secondary oxidant streams direction through said quad. 
     
     
         15 . The burner as claimed in  claim 13  wherein said nozzles at said distal end of said lance are angled so their projected axis intercepts an outer edge of said burner quad. 
     
     
         16 . The burner as claimed in  claim 1  wherein said burned is adapted for external oxidant staging. 
     
     
         17 . A method for oxidizing solid fuels comprising feeding said fuel and oxidant mixtures of oxygen and carbon dioxide to a burner comprising a lance having one or more nozzle feeds and one or more nozzle outlets concentrically surrounded by a primary oxidant passage which is concentrically surrounded by a secondary oxidant passage wherein said primary and secondary oxidant passages communicate at their proximal ends with one or more gas supplies, said lance having a distal and proximal end and said one or more nozzle feeds is in communication with a gas supply. 
     
     
         18 . The method as claimed in  claim 17  wherein said solid fuels are selected from the group consisting of coal, coke, peat, biomass and mixtures thereof. 
     
     
         19 . The method as claimed in  claim 17  wherein said solid fuel is transported via a primary oxidant stream through said primary oxidant passages. 
     
     
         20 . The method as claimed in  claim 19  wherein said primary oxidant stream has a volumetric oxygen content less than 32%. 
     
     
         21 . The method as claimed in  claim 19  wherein said primary oxidant stream has a volumetric oxygen content less than 25%. 
     
     
         22 . The method as claimed in  claim 19  wherein said primary oxidant stream has a volumetric oxygen content less than 21%. 
     
     
         23 . The method as claimed in  claim 17  wherein a secondary oxidant stream is fed through said secondary oxidant passage. 
     
     
         24 . The method as claimed in  claim 17  wherein said secondary oxidant stream has a volumetric oxygen content less than 40%. 
     
     
         25 . The method as claimed in  claim 24  wherein said secondary oxidant stream has a volumetric oxygen content less than 30%. 
     
     
         26 . The method as claimed in  claim 24  wherein said secondary oxidant stream has a volumetric oxygen content less than 28%. 
     
     
         27 . The method as claimed in  claim 17  wherein said nozzles at said distal end of said lance is angled in a manner whereby discharge streams from said lance do not intercept an outer wall of said primary oxidant passage. 
     
     
         28 . The method as claimed in  claim 19  wherein said nozzles at said distal end of said lance are positioned to direct oxygen into a flow path of said primary oxidant stream containing solid fuel. 
     
     
         29 . The method as claimed in  claim 17  wherein said burner further comprises a quad. 
     
     
         30 . The method as claimed in  claim 30  wherein said nozzles at said distal end of said lance are arranged complimentary to said primary and secondary oxidant streams direction through said quarl. 
     
     
         31 . The method as claimed in  claim 30  wherein said nozzles at said distal end of said lance is angled so their projected axis intercepts an outer edge of said burner quad. 
     
     
         32 . The method as claimed in  claim 17  wherein said burned is adapted for external oxidant staging. 
     
     
         33 . The method as claimed in  claim 17  wherein said oxidant stream issuing through said distal end of said lance is at a higher velocity than said primary oxidant. 
     
     
         34 . The method as claimed in  claim 17  wherein said oxidant stream issuing through said distal end of said lance is less than four times the velocity of said primary oxidant. 
     
     
         35 . The method as claimed in  claim 17  wherein said fuel and oxidant mixture comprises oxygen and carbon dioxide. 
     
     
         36 . The method as claimed in  35  wherein said fuel and oxidant mixture is formed by mixing flue gases from a combustion process with industrially pure oxygen.