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A nozzle comprising a nozzle body having an inlet face, an outlet face, and an inlet flow axis passing through the inlet and outlet faces, and two or more slots extending through the nozzle body from the inlet face to the outlet face. Each slot has a slot axis and the slot axis of at least one of th

A nozzle comprising a nozzle body having an inlet face, an outlet face, and an inlet flow axis passing through the inlet and outlet faces, and two or more slots extending through the nozzle body from the inlet face to the outlet face. Each slot has a slot axis and the slot axis of at least one of the slots is not parallel to the inlet flow axis of the nozzle body. In another embodiment, the nozzle comprises a nozzle body having an inlet face, an outlet face, and an inlet flow axis passing through the inlet and outlet faces, and two or more slots extending through the nozzle body from the inlet face to the outlet face, each slot having a slot axis, wherein none of the slots intersect other slots and all of the slots are in fluid flow communication with a common fluid supply conduit. The nozzles may be used to inject secondary fuel in a burner system having a central burner combusting a primary fuel surrounded by secondary fuel injection nozzles.

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1. A burner assembly comprising:(a) a central flame holder having inlet means for an oxidant gas, inlet means for a primary fuel, a combustion region for combusting the oxidant gas and the primary fuel, and an outlet for discharging a primary effluent from the flame holder; and (b) a plurality of se

1. A burner assembly comprising:(a) a central flame holder having inlet means for an oxidant gas, inlet means for a primary fuel, a combustion region for combusting the oxidant gas and the primary fuel, and an outlet for discharging a primary effluent from the flame holder; and (b) a plurality of secondary fuel injector nozzles surrounding the outlet of the central flame holder, wherein each secondary fuel injector nozzle comprises (1) a nozzle body having an inlet face, an outlet face, and an inlet flow axis passing through the inlet and outlet faces; and (2) one or more slots extending through the nozzle body from the inlet face to the outlet face, each slot having a slot axis and a slot center plane. 2. The burner assembly of claim 1 wherein each secondary fuel injector nozzle has two or more slots and the slot axes of at least two slots are not parallel to each other.3. The burner assembly of claim 1 wherein each secondary fuel injector nozzle has two or more slots and at least two of the slots intersect each other.4. The burner assembly of claim 3 wherein the nozzle body has four slots, wherein a first and a second slot intersect each other, and wherein a third and a fourth slot intersect each other.5. The burner assembly of claim 3 wherein the nozzle body has three or more slots and a first slot is intersected by each of the other slots.6. The burner assembly of claim 5 wherein the center plane of the first slot intersects the inlet flow axis at an included angle of between 0 and about 15 degrees.7. The burner assembly of claim 5 wherein the center plane of any of the other slots intersects the inlet flow axis at an included angle of between 0 and about 30 degrees.8. The burner assembly of claim 5 wherein the center planes of two adjacent other slots intersect at an included angle of between 0 and about 15 degrees.9. The burner assembly of claim 8 wherein the two adjacent slots intersect at the inlet face of the nozzle body.10. A combustion process comprising:(a) providing burner assembly including: (1) a central flame holder having inlet means for an oxidant gas, inlet means for a primary fuel, a combustion region for combusting the oxidant gas and the primary fuel, and an outlet for discharging a primary effluent from the flame holder; and (2) a plurality of secondary fuel injector nozzles surrounding the outlet of the central flame holder, wherein each secondary fuel injector nozzle comprises (2a) a nozzle body having an inlet face, an outlet face, and an inlet flow axis passing through the inlet and outlet faces; and (2b) one or more slots extending through the nozzle body from the inlet face to the outlet face, each slot having a slot axis and a slot center plane; (b) introducing the primary fuel and the oxidant gas into the central flame holder, combusting the primary fuel with a portion of the oxidant gas in the combustion region of the flame holder, and discharging a primary effluent containing combustion products and excess oxidant gas from the outlet of the flame holder; and (c) injecting the secondary fuel through the secondary fuel injector nozzles into the primary effluent from the outlet of the flame holder and combusting the secondary fuel with excess oxidant gas. 11. The combustion process of claim 10 wherein the primary fuel and the secondary fuel are gases having different compositions.12. The combustion process of claim 11 wherein the primary fuel is natural gas and the secondary fuel comprises hydrogen, methane, carbon monoxide, and carbon dioxide obtained from a pressure swing adsorption system.13. The combustion process of claim 11 wherein the secondary fuel is introduced into the secondary fuel injector nozzles at a pressure of less than about 3 psig.14. The combustion process of claim 10 wherein the primary fuel and the secondary fuel are gases having the same compositions.