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A reactor system is integrated internally within an anode-side cavity of a fuel cell. The reactor system is configured to convert higher hydrocarbons to smaller species while mitigating the lower production of solid carbon. The reactor system may incorporate one or more of a pre-reforming section, a

A reactor system is integrated internally within an anode-side cavity of a fuel cell. The reactor system is configured to convert higher hydrocarbons to smaller species while mitigating the lower production of solid carbon. The reactor system may incorporate one or more of a pre-reforming section, an anode exhaust gas recirculation device, and a reforming section.

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1. A reactor system for a fuel cell having an anode-side cavity, comprising: a fuel delivery element comprising one or more walls forming a fuel passage, a fuel inlet at one end of the fuel passage, and a fuel outlet at an opposite end of the fuel passage;the fuel delivery element configured to deli

1. A reactor system for a fuel cell having an anode-side cavity, comprising: a fuel delivery element comprising one or more walls forming a fuel passage, a fuel inlet at one end of the fuel passage, and a fuel outlet at an opposite end of the fuel passage;the fuel delivery element configured to deliver fuel through the fuel outlet into the cavity of the fuel cell and to induce recirculation of partially utilized anode gas within the cavity or into the fuel passage, the fuel delivery element including a reforming section configured to reform a hydrocarbon fuel to a smaller species in the presence of an oxidant. 2. A reactor system for a fuel cell having an anode-side cavity comprising: a fuel delivery element comprising one or more walls forming a fuel passage, a fuel inlet at one end of the fuel passage, and a fuel outlet at an opposite end of the fuel passage;the fuel delivery element configured to deliver fuel through the fuel outlet into the cavity of the fuel cell and to induce recirculation of partially utilized anode gas within the cavity or into the fuel passage, wherein the fuel delivery element is operative to convert a higher hydrocarbon fuel to a smaller species. 3. A reactor system for a fuel cell having an anode-side cavity comprising: a fuel delivery element comprising one or more walls forming a fuel passage, a fuel inlet at one end of the fuel passage, and a fuel outlet at an opposite end of the fuel passage;the fuel delivery element configured to deliver fuel through the fuel outlet into the cavity of the fuel cell and to induce recirculation of partially utilized anode gas within the cavity or into the fuel passage, wherein the fuel delivery element is operative to lower production of solid carbon. 4. The reactor system of claim 1, wherein the oxidant is comprised of one or more of water, carbon dioxide, or oxygen. 5. The reactor system of claim 1, wherein the fuel delivery element further includes an anode exhaust gas recirculation device configured to cause recirculation of oxygen-rich anode exhaust gas formed in the anode-side cavity of the fuel cell through a length of the fuel delivery passage of the fuel delivery element. 6. The reactor system of claim 5, wherein the reforming section is located along the fuel delivery element downstream of the anode exhaust gas recirculation device. 7. The reactor system of claim 5, the fuel delivery element further including a pre-reforming section disposed upstream of the anode exhaust gas recirculation device. 8. The reactor system of claim 1, wherein the fuel delivery element comprises an anode exhaust gas recirculation device configured to cause recirculation of oxygen-rich anode exhaust gas formed in the anode-side cavity of the fuel cell through a length of the fuel delivery passage of the fuel delivery element. 9. The reactor system of claims 5 or 8 wherein the anode exhaust gas recirculation device comprises a constriction in the one or more walls forming the fuel passage of the fuel delivery element and one or more suction bores downstream of the constriction, the suction bores open to the anode-side cavity of the fuel cell, whereby anode exhaust gas is drawn into the fuel delivery device through the suction bores by suction and fuel is reformed in the presence of the anode exhaust gas within the fuel delivery device. 10. The reactor system of claim 9, wherein a partition is disposed across the fuel passage in the fuel delivery element, and the constriction comprises an orifice in the partition. 11. The reactor system of claim 9, wherein the constriction comprises a venturi shape formed in the one or more walls of the fuel delivery element. 12. The reactor system of claim 1, wherein a portion of the fuel delivery element comprises an ejector configured to eject fuel into the cavity. 13. The reactor system of claim 12, wherein the ejector is disposed adjacent the fuel outlet. 14. The reactor system of claim 1, wherein the reforming section is comprised of a material to reform a hydrocarbon fuel to a smaller species in the presence of an oxidant. 15. The reactor system of claim 1, wherein the reforming section comprises one or more catalyst materials coated on an interior surface of the one or more walls of the fuel delivery element. 16. The reactor system of claim 1, wherein the reforming section comprises one or more catalyst materials coated on an exterior surface of the one or more walls of the fuel delivery element. 17. The reactor system of claims 15 or 16, wherein the one or more catalyst materials are comprised of formulations of rhodium, nickel, ruthenium, palladium, platinum, molybdenum, vanadium, or cobalt with ceria, alumina, or zirconia. 18. The reactor system of claim 1, wherein the fuel delivery element is coated with a passivating material configured to minimize solid carbon nucleation. 19. The reactor system of claim 18, wherein the passivating material is comprised of formulations of ceria, alumina, or zirconia. 20. The reactor system of claim 1, wherein the fuel delivery element comprises an anode exhaust gas recirculation device configured to cause circulation of oxygen-rich anode exhaust gas formed in the anode-side cavity of the fuel cell within a section of the cavity of the fuel cell. 21. The reactor system of claim 20, wherein the fuel delivery element comprises a venturi or an orifice located along a portion of the fuel passage. 22. The reactor system of claim 21, wherein the venturi or the orifice is disposed adjacent the fuel outlet of the fuel delivery device. 23. The reactor system of claim 1, wherein the one or more walls of the fuel delivery element are comprised of a ceramic or a metallic material. 24. The reactor system of claim 1, wherein the one or more walls of the fuel delivery element have a thickness selected to provide a predetermined rate of heat transfer therethrough. 25. A fuel cell system comprising: a fuel cell including an anode-side cavity; anda reactor system comprising: a fuel delivery element comprising one or more walls forming a fuel passage, a fuel inlet at one end of the fuel passage, and a fuel outlet at an opposite end of the fuel passage,the fuel delivery element configured to deliver fuel through the fuel outlet into the cavity of the fuel cell and to induce recirculation of partially utilized anode gas within the cavity or into the fuel passage, wherein the fuel delivery element is operative to convert a higher hydrocarbon fuel to a smaller species, andwherein the reactor system is disposed to eject fuel into the anode-side cavity of the fuel cell. 26. The fuel cell system of claim 25, wherein the fuel cell is a solid oxide fuel cell. 27. The fuel cell system of claim 25, wherein the fuel cell is tubular. 28. The fuel cell system of claim 25, wherein the fuel cell is closed at one end and open at an opposite end, the open end comprising an anode exhaust port. 29. The fuel cell system of claim 25, wherein the reactor system is supported by a tube sheet, the tube sheet forming a wall of a coolant chamber. 30. The fuel cell system of claim 29, wherein the tube sheet further includes a block of insulation to aid in controlling the temperature of the coolant chamber or the temperature of the reactor system within the fuel cell. 31. The fuel cell system of claim 25, wherein a downstream section of the reactor system is in thermal communication with the fuel cell. 32. The fuel cell system of claim 25, wherein an upstream section of the reactor system extends outside of the fuel cell and is in thermal communication with a chamber external of the fuel cell. 33. The fuel cell system of claim 32, wherein the external chamber comprises an anode exhaust chamber or a coolant chamber supplied with a coolant fluid. 34. The fuel cell system of claim 33, wherein the coolant fluid comprises air or a fuel. 35. The fuel cell system of claim 25, wherein the fuel cell system is configured to have a temperature gradient along the fuel cell. 36. The fuel cell system of claim 25, wherein the fuel cell system further includes a supplemental oxidant feed into the fuel inlet. 37. The fuel cell system of claim 25, further comprising an oxygen partial pressure sensor disposed within the fuel cell. 38. The fuel cell system of claim 25, further comprising: a plurality of additional fuel cells arranged in a stack and fused to a tube sheet, the tube sheet forming a part of a fuel plenum; anda plurality of reactor systems, each reactor system disposed in one of the plurality of additional fuel cells. 39. The fuel cell system of claim 38, further comprising an insulating material disposed between the fuel plenum and the fuel cells, the reactor systems extending through the insulating material, whereby the fuel cell system is divided into zones having different operating temperature ranges. 40. The fuel cell system of claim 25, further comprising a plenum thermally insulated from the fuel cell to maintain a lower temperature in the plenum than in the cavity of the fuel cell, the reactor system extending from the plenum into the fuel cell. 41. The fuel cell system of claim 25, wherein the reactor system is in fluid communication with a fuel source under pressure, wherein the recirculation is induced within the cavity by a motive force due to the pressurization of the fuel. 42. The fuel cell system of claim 25, wherein the reactor system is disposed to eject fuel into the cavity at an entrance to the cavity. 43. The reactor system of claim 1, further comprising a fuel source in fluid communication with the fuel inlet of the fuel delivery element. 44. The reactor system of claim 43, wherein the fuel source is comprised of a hydrocarbon fuel. 45. The reactor system of claim 43, wherein the fuel source is comprised of methane. 46. The reactor system of claim 43, wherein the fuel source is comprised of biogas. 47. The reactor system of claim 43, wherein the fuel source is comprised of a liquid fuel. 48. The reactor system of claim 43, wherein the fuel source is comprised of a fuel mixture which, when at thermodynamic equilibrium at an operating temperature of the fuel cell lowers a partial pressure of oxygen below that of oxygen on a cathode side of the fuel cell. 49. The fuel cell system of claim 25, further comprising a fuel source in fluid communication with the fuel inlet of the fuel delivery element. 50. The fuel cell system of claim 49, wherein the fuel source is comprised of a hydrocarbon fuel, methane, biogas, or a liquid fuel. 51. The fuel cell system of claim 49, wherein the fuel source is comprised of a fuel mixture which, when at thermodynamic equilibrium at an operating temperature of the fuel cell lowers a partial pressure of oxygen below that of oxygen on a cathode side of the fuel cell. 52. A method for delivering a fuel stream in a fuel cell system, comprising the steps of: providing a solid oxide fuel cell system comprising one or a plurality of tubular fuel cells, each fuel cell comprising an anode-side cavity;introducing a fuel into the cavity of each of the fuel cells through a fuel delivery tube having an inlet in fluid communication with a fuel source and an outlet within the cavity, the fuel delivery tube configured to induce recirculation of anode gas within the cavity. 53. The method of claim 52, wherein the fuel comprises a hydrocarbon fuel, and further comprising the step of reforming the fuel within the cavity of the fuel cell to smaller hydrocarbon species. 54. The method of claim 53, further comprising reforming the hydrocarbon fuel within the cavity of the fuel cell to hydrogen and carbon monoxide. 55. The method of claim 53, further comprising reforming the hydrocarbon fuel through reaction with one or more catalyst materials within the cavity. 56. The method of claim 55, wherein the one or more catalyst materials are comprised of formulations of rhodium, nickel, ruthenium, palladium, platinum, molybdenum, vanadium, or cobalt with ceria, alumina, or zirconia. 57. The method of claim 53, further comprising reforming the hydrocarbon fuel in the fuel delivery tube disposed internally within the cavity. 58. The method of claim 52, further comprising introducing the fuel under pressure into the cavity. 59. The method of claim 52, further comprising controlling the temperature of the fuel introduced into the cavity and the temperature of reactions within the cavity.