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A combustion system uses a fuel nozzle with an inner wall having a fuel inlet in fluid communication with a fuel outlet in a fuel cartridge. The inner wall defines a mounting location for inserting the fuel cartridge. A pair of annular lip seals around the cartridge outer wall on both sides of the f

A combustion system uses a fuel nozzle with an inner wall having a fuel inlet in fluid communication with a fuel outlet in a fuel cartridge. The inner wall defines a mounting location for inserting the fuel cartridge. A pair of annular lip seals around the cartridge outer wall on both sides of the fuel outlet seals the fuel passage between the fuel inlet and the fuel outlet.

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1. A fuel nozzle assembly comprising: a fuel plenum, a fuel nozzle outer wall, and a fuel nozzle inner wall, the fuel nozzle inner wall defining a cartridge location and comprising a fuel plenum inlet in fluid communication with the fuel plenum;a plurality of mixing tubes extending through the fuel

1. A fuel nozzle assembly comprising: a fuel plenum, a fuel nozzle outer wall, and a fuel nozzle inner wall, the fuel nozzle inner wall defining a cartridge location and comprising a fuel plenum inlet in fluid communication with the fuel plenum;a plurality of mixing tubes extending through the fuel plenum between the fuel nozzle outer wall and the fuel nozzle inner wall, the plurality of mixing tubes each for delivering an air/fuel mixture through one end of the mixing tube, wherein the mixing tubes are disposed substantially in parallel to each other;a removable fuel cartridge located in the cartridge location defined by the fuel nozzle inner wall outside of each of the plurality of mixing tubes, the removable fuel cartridge comprising:a fuel cartridge outer wall, the fuel cartridge outer wall comprising a fuel cartridge outlet in fluid communication with the fuel plenum inlet when the removable fuel cartridge is inserted into the cartridge location;a first cartridge compartment disposed around an axis of the cartridge and a second cartridge compartment disposed between the fuel cartridge outer wall and the first cartridge compartment, wherein the first cartridge compartment is configured to contain a pressurized liquid fuel and the second cartridge compartment is configured to contain a pressurized gaseous fuel for delivery through the fuel cartridge outlet into the fuel plenum,wherein the removable fuel cartridge is configured so that the liquid fuel is directed through the removable fuel cartridge without flowing through the mixing tubes; andannular lip seals disposed around the fuel cartridge outer wall between the fuel cartridge outer wall and the fuel nozzle inner wall, a first one of the lip seals on one side of the removable fuel cartridge outlet and a second one of the lip seals on a second side of the removable fuel cartridge outlet for sealing the fuel cartridge outer wall against the fuel nozzle inner wall in a substantially gas tight fashion. 2. The fuel nozzle assembly of claim 1, wherein the first cartridge compartment comprises a spray opening for spraying fuel into a combustion chamber. 3. The fuel nozzle assembly of claim 2, wherein the fuel cartridge outlet extends from the second cartridge compartment through the cartridge outer wall. 4. The fuel nozzle assembly of claim 1, wherein the liquid fuel comprises an emulsified mixture of fuel oil and water, and wherein the gaseous fuel comprises natural gas. 5. The fuel nozzle assembly of claim 1, wherein the fuel nozzle outer wall is shaped to include a pair of mating surfaces such that the mating surfaces of a plurality of fuel nozzles are placed adjacent to each other to form a generally circular arrangement. 6. A fueling system comprising: a fuel nozzle comprising: a fuel plenum;a plurality of mixing tubes each for delivering an air/fuel mixture through one end of the mixing tube, wherein the mixing tubes are disposed substantially in parallel to each other, the mixing tubes each comprising: a proximal end for receiving the air which travels through the mixing tube,at least one fuel aperture through a sidewall of the mixing tube in fluid communication with the fuel plenum for receiving a fuel portion of the air/fuel mixture that mixes with the air traveling through the mixing tube, anda distal end comprising said one end of the mixing tube for delivering the air/fuel mixture therethrough, anda fuel cartridge chamber disposed substantially in parallel with and outside of each of the plurality of mixing tubes; anda removable fuel cartridge inserted into the fuel cartridge chamber,wherein the removable fuel cartridge comprises a first fuel compartment configured to contain a liquid fuel and a second fuel compartment configured to contain the fuel that mixes with the air, andwherein the removable fuel cartridge is configured so that the liquid fuel is directed through the removable fuel cartridge without flowing through the mixing tubes. 7. The fueling system of claim 6, wherein the first fuel compartment comprises an opening at its distal end for spraying the liquid fuel. 8. The fueling system of claim 7, wherein the removable fuel cartridge further comprises: a fuel outlet extending from the second fuel compartment through an outer wall of the removable fuel cartridge, the fuel outlet in fluid communication with the fuel plenum in the fuel nozzle when the removable fuel cartridge is inserted into the fuel cartridge chamber. 9. The fueling system of claim 8, further comprising annular lip seals disposed circumferentially along an outer wall of the removable fuel cartridge substantially in parallel with each other, wherein a first one of the lip seals is disposed on one side of the fuel outlet and a second one of the lip seals is disposed on a second side of the fuel outlet for providing a substantially gas tight seal between the outer wall of the removable fuel cartridge and a wall of the fuel cartridge chamber. 10. The fueling system of claim 9, wherein the wall of the fuel cartridge chamber comprises a pair of annular seal retention projections each having a contour matching a contour of one of the lip seals for sealingly mating therewith when the removable fuel cartridge is inserted into the fuel cartridge chamber. 11. The fueling system of claim 8, wherein the fuel that mixes with the air comprises natural gas and the liquid fuel comprises an emulsion of fuel oil and water. 12. A fuel nozzle system comprising: a fuel nozzle comprising an enclosed fuel plenum;a plurality of mixing tubes extending through the fuel nozzle, the mixing tubes each comprising a first end in fluid communication with an air supply and a second end for delivering an air/fuel mixture, each of the mixing tubes comprising apertures therethrough in fluid communication with the fuel plenum; anda mounting tube extending through the fuel nozzle and outside of each of the plurality of mixing tubes for receiving and securing a removable fuel cartridge therein, the mounting tube including an opening therethrough for establishing fluid communication between an interior of the mounting tube and the fuel plenum,a removable fuel cartridge located in the mounting tube, wherein the removable fuel cartridge comprises a gaseous fuel compartment configured to contain gaseous fuel in fluid communication with the fuel plenum through an opening in an outer wall of the removable fuel cartridge and the opening in the mounting tube and a liquid fuel compartment configured to contain liquid fuel separate from the gaseous fuel and having a nozzle for expelling the liquid fuel, andwherein the removable fuel cartridge is configured so that the liquid fuel is directed through the removable fuel cartridge without flowing through the mixing tubes. 13. The fuel nozzle system of claim 12, wherein the removable fuel cartridge is received and secured in the mounting tube. 14. The fuel nozzle system of claim 13, further comprising: lip seals disposed between the mounting tube and the removable fuel cartridge, a first one of the lip seals on a first side of the mounting tube opening and the opening in the fuel cartridge outer wall, and a second one of the lip seals on a second side of the mounting tube opening and the opening in the fuel cartridge outer wall. 15. The fuel nozzle system of claim 14, wherein the mounting tube comprises seal retention projections on an interior side of the mounting tube for mating against the lip seals when the removable fuel cartridge is inserted into the mounting tube. 16. The fuel nozzle assembly of claim 1, wherein the plurality of mixing tubes are disposed radially around the removable fuel cartridge. 17. The fueling system of claim 6, wherein the plurality of mixing tubes are disposed radially around the removable fuel cartridge. 18. The fuel nozzle system of claim 12, wherein the plurality of mixing tubes are disposed radially around the removable fuel cartridge.