Fluid distribution and mixing grid for mixing gases

An oxy-combustion system comprising:

• a furnace defining an interior combustion area;
• an oxygen supply system;
• a fuel supply system defining a primary flue gas inlet and a fuel outlet;
• at least one flue gas processing system positioned downstream of and in communication with the furnace;
• a primary gas system defining a primary flue gas outlet, the primary gas system being in communication with the at least one flue gas processing system and the primary flue gas outlet being in fluid communication with the fuel inlet;
• a secondary gas system defining a secondary flue gas outlet, the secondary gas system being in communication with the at least one flue gas processing system and the secondary flue gas outlet being in communication with the furnace;
• at least one oxygen discharge line being in communication with at least one of the primary gas system and the secondary gas system;
• and
• a grid positioned in a duct of at least one of the primary gas system and the secondary gas system, the grid comprising:
• a plurality of lances arranged in a first plane and positioned transverse to a flow direction of a flue gas outside of the lances and within a predetermined flow area;
• each of the plurality of lances having at least one oxygen inlet and a plurality of outlet nozzles, the oxygen inlet being in communication with the oxygen supply system;
• and
• at least one of the outlet nozzles being directed generally in the flow direction of the of flue gas outside of the lances, and configured to discharge oxygen therefrom;
• wherein the plurality of lances includes a set of upper lances extending downwardly and a set of lower lances extending upwardly in the duct;
• and
• wherein each of the upper lances vertically align with a respective lower lance, and further comprising at least one sleeve moveable positioned between at least one of the upper lance and lower lance.