Method and system for mixing reactor feed

1. A feed injector system comprising an injector tip including:

a first injector port assembly comprising a plurality of annular channels substantially concentric about a longitudinal axis that define corresponding fluid flow paths that direct a first flow of fluid substantially axially therethrough from a respective source to a reaction zone; and

a second injector port assembly comprising a plurality of circumferentially-spaced flow ports, each flow port of said plurality of circumferentially-spaced flow ports extending axially to a face of said injector tip, each said flow port surrounded by a plurality of auxiliary ports spaced about a circumference of a respective circumferentially-spaced flow port of said plurality of circumferentially-spaced flow ports, said plurality of auxiliary ports coupled in flow communication with a toroidal-shaped passage configured to receive a second flow of fluid from said respective circumferentially-spaced flow port and channel the second flow of fluid to said auxiliary ports such that the second flow of fluid is directed by said toroidal-shaped passage in an axial direction, a radially inward direction towards said respective circumferentially-spaced flow port, and a circumferential direction about said respective circumferentially-spaced flow port prior to being discharged from said auxiliary ports, said plurality of auxiliary ports also coupled in flow communication to a plenum through one or more passages extending from said plenum to said auxiliary ports, said plenum at least partially circumscribing said injector tip assembly.

2. A system in accordance with claim 1 , wherein said plurality of substantially concentric annular channels comprises:

a first conduit substantially cylindrically shaped about a longitudinal axis, said first conduit comprising a radially outer surface and a radially inner surface, said first conduit further comprising a supply end, a discharge end and a length extending therebetween;

a second conduit at least partially surrounding and substantially concentrically aligned with said first conduit, said second conduit substantially cylindrically shaped about the longitudinal axis, said second conduit comprising a radially outer surface and a radially inner surface, said second conduit further comprising a supply end, a discharge end, and a length extending therebetween.

3. A system in accordance with claim 2 , wherein said first conduit comprises a chamfered discharge end.

4. A system in accordance with claim 2 , wherein said second conduit comprises a radially converging discharge end.

5. A system in accordance with claim 2 , wherein said first conduit comprises a chamfered discharge end and said second conduit comprises a radially converging discharge end such that a flow path defined between said first and said second conduits is directed radially inwardly between the radially converging discharge end and the chamfered discharge end.

6. A system in accordance with claim 5 , wherein said flow path defined between said first and said second conduits is configured to channel a dry solid fuel and conveyance fluid.

7. A system in accordance with claim 2 , wherein a flow path defined within said first conduit is configured to channel a dry solid fuel and conveyance fluid.

8. A system in accordance with claim 1 , wherein said flow port is configured to channel at least one of a dry solid fuel and a liquid fuel and said auxiliary ports are configured to channel an oxidizer to a reaction zone.

9. A system in accordance with claim 1 , further comprising a plenum circumscribing said feed injector port.

10. A system in accordance with claim 9 , wherein said plenum is coupled in flow communication with said auxiliary ports.

11. A system in accordance with claim 9 , wherein said plenum is coupled in flow communication with said auxiliary ports through one or more passages extending from said plenum to said auxiliary ports.

12. A gasification system comprising:

a pressure vessel for partially oxidizing a fuel;

a feed injector configured to inject a fuel into the pressure vessel;

wherein the feed injector further comprises:

a first injector port assembly comprising a plurality of annular channels substantially concentric about a longitudinal axis that define corresponding fluid flow paths that direct a first flow of fluid substantially axially therethrough from a respective source to a reaction zone; and

a second injector port assembly comprising a plurality of circumferentially-spaced flow ports, each said flow port surrounded by a plurality of auxiliary ports spaced about a circumference of a respective circumferentially-spaced flow port of the plurality of circumferentially-spaced flow ports, said plurality of auxiliary ports coupled in flow communication with a toroidal-shaped passage configured to receive a second flow of fluid from said respective circumferentially-spaced flow port and channel the second flow of fluid to said auxiliary ports such that the second flow of fluid is directed by said toroidal-shaped passage in an axial direction, a radially inward direction towards said respective circumferentially-spaced flow port, and a circumferential direction about said respective circumferentially-spaced flow port prior to being discharged from said auxiliary ports, said plurality of auxiliary ports also coupled in flow communication to a plenum through one or more passages extending from said plenum to said auxiliary ports, said plenum at least partially circumscribing said injector tip assembly.

13. A system in accordance with claim 12 , wherein said toroidal-shaped passage is configured to impart a circumferential flow direction to the second flow of fluid through the toroidal-shaped passage.

14. A system in accordance with claim 12 , further comprising a plenum circumscribing said feed injector.

15. A system in accordance with claim 14 , wherein said plenum is coupled in flow communication with said auxiliary ports through one or more passages extending from said plenum to said auxiliary ports.