Claims
- 1. A fuel processing system, comprising:
a fuel processor adapted to receive a feed stream containing at least one feedstock and to produce a mixed gas stream containing hydrogen gas therefrom; and a feedstock delivery system adapted to deliver the feed stream to the fuel processor, the feedstock delivery system comprising:
a feedstock reservoir having a compartment adapted to store under pressure in a liquid phase a volume of a carbon-containing feedstock; a pressurization assembly adapted to pressurize the reservoir by delivering a pressurized gas stream to the compartment of the reservoir; and a delivery regulator adapted to regulate the delivery of the feedstock from the reservoir to the fuel processor.
- 2. The fuel processing system of claim 1, wherein the pressurized gas stream is at least substantially comprised of nitrogen gas.
- 3. The fuel processing system of claim 1, wherein the pressurized gas stream is at least substantially comprised of an inert gas.
- 4. The fuel processing system of claim 1, wherein the pressurized gas stream is a nitrogen-enriched air stream.
- 5. The fuel processing system of claim 1, wherein the pressurization assembly is adapted to deliver into the compartment a pressurized gas stream having insufficient oxygen for the feedstock in the compartment to be flammable or explosive when stored under pressure in the compartment.
- 6. The fuel processing system of claim 1, wherein the reservoir is further adapted to receive and store in the compartment water along with the carbon-containing feedstock.
- 7. The fuel processing system of claim 1, wherein the pressurization assembly includes a source of the pressurized gas stream.
- 8. The fuel processing system of claim 7, wherein the source of the pressurized gas stream is adapted to receive an air stream and to produce a nitrogen-enriched air stream therefrom, and further wherein the nitrogen-enriched air stream forms at least a portion of the pressurized gas stream.
- 9. The fuel processing system of claim 8, wherein the pressurized gas stream is completely formed from the nitrogen-enriched air stream.
- 10. The fuel processing system of claim 8, wherein the pressurized gas stream comprises at least a portion of the nitrogen-enriched air stream and at least a portion of a second gas stream selected from the group consisting of an air stream, nitrogen gas, a combustion-inhibiting gas and an inert gas.
- 11. The fuel processing system of claim 8, wherein the source of the pressurized gas stream includes an oxygen-removal assembly that is adapted to reduce the concentration of oxygen gas in the air stream received by the source of the pressurized gas stream.
- 12. The fuel processing system of claim 11, wherein the oxygen-removal assembly is adapted to reduce the concentration of oxygen gas in the air stream by chemically reacting at least a portion of the oxygen gas.
- 13. The fuel processing system of claim 11, wherein the oxygen-removal assembly is adapted to reduce the concentration of oxygen gas in the air stream by absorbing at least a portion of the oxygen gas.
- 14. The fuel processing system of claim 11, wherein the oxygen-removal assembly is adapted to reduce the concentration of oxygen gas in the air stream by separating from the air stream an oxygen-rich stream containing a higher concentration of oxygen gas than the air stream.
- 15. The fuel processing system of claim 11, wherein the oxygen-removal assembly includes at least one oxygen-selective membrane, and further wherein the oxygen-removal assembly is adapted to deliver the air stream into contact with the at least one oxygen-selective membrane, with the nitrogen-enriched air stream being formed from a portion of the air stream that does not pass through the at least one oxygen-selective membrane.
- 16. The fuel processing system of claim 1, wherein the pressurization assembly is adapted to maintain the pressure within the reservoir at a pressure of at least 25 psig.
- 17. The fuel processing system of claim 16, wherein the pressurization assembly is adapted to maintain the pressure within the reservoir at a pressure of at least 50 psig.
- 18. The fuel processing system of claim 16, wherein the pressurization assembly is adapted to maintain the pressure within the reservoir at a pressure in the range of 100-300 psig.
- 19. The fuel processing system of claim 1, wherein the pressurization assembly includes a pressure regulator that is adapted to regulate the pressure in the compartment.
- 20. The fuel processing system of claim 1, wherein the feedstock delivery system further includes at least one oxygen sensor adapted to measure the concentration of oxygen gas in at least one of the pressurized gas stream and the compartment of the reservoir.
- 21. The fuel processing system of claim 20, wherein the feedstock delivery system is adapted to reduce the pressure in the compartment upon detection of a concentration of oxygen gas in at least one of the compartment and the pressurized gas stream that exceeds a determined threshold value.
- 22. The fuel processing system of claim 20, wherein the fuel processing system is adapted to shutdown the fuel processor upon detection of a concentration of oxygen gas in at least one of the compartment and the pressurized gas stream that exceeds a determined threshold value.
- 23. The fuel processing system of claim 20, wherein the feedstock delivery system includes an exhaust assembly that is adapted to introduce an exhaust gas stream into the compartment upon detection of a concentration of oxygen gas in at least one of the compartment and the pressurized gas stream that exceeds a determined threshold value.
- 24. The fuel processing system of claim 23, wherein the exhaust gas stream is at least substantially comprised of at least one of an inert gas and a combustion-inhibiting gas.
- 25. The fuel processing system of claim 20, wherein the feedstock delivery system includes at least one oxygen sensor adapted to measure the concentration of oxygen gas in the compartment of the reservoir.
- 26. The fuel processing system of claim 1, wherein the feedstock delivery system includes a pressure sensor adapted to measure the pressure within the compartment of the reservoir, and further wherein upon detection that the pressure within the compartment is below a determined threshold value, the pressurization assembly is adapted to increase the pressure within the compartment.
- 27. The fuel processing system of claim 1, wherein the delivery regulator is a pumpless delivery regulator that is adapted to deliver the feedstock from the reservoir to the fuel processor without utilizing a pump.
- 28. The fuel processing system of claim 27, wherein the delivery regulator includes a Valve assembly that selectively controls the flow of the feedstock from the reservoir to the fuel processor.
- 29. The fuel processing system of claim 28, wherein the valve assembly includes at least one pulse width modulation controlled solenoid valve.
- 30. The fuel processing system of claim 28, wherein the valve assembly further includes at least one servo motor controlled throttle valve.
- 31. The fuel processing system of claim 1, wherein the feedstock delivery system includes a plurality of reservoirs.
- 32. The fuel processing system of claim 31, wherein the feedstock delivery system includes a gas conduit through which the pressurized gas stream may flow between the plurality of reservoirs.
- 33. The fuel processing system of claim 32, wherein the gas conduit is adapted to equalize the pressure within the plurality of reservoirs.
- 34. The fuel processing system of claim 31, wherein the plurality of reservoirs are adapted to receive different feedstocks and further wherein the feedstock delivery system includes a mixing structure adapted to receive flows of the feedstocks from the plurality of reservoirs and to produce a feed stream for the fuel processor therefrom.
- 35. The fuel processing system of claim 1, wherein the fuel processor is adapted to produce the mixed gas stream by steam reforming.
- 36. The fuel processing system of claim 1, wherein the fuel processor is adapted to produce the mixed gas stream by a selected one of partial oxidation, pyrolysis and autothermal reforming.
- 37. The fuel processing system of claim 1, wherein the fuel processor includes a separation region adapted to receive the mixed gas stream and to produce a hydrogen-rich stream therefrom having a greater concentration of hydrogen gas than the mixed gas stream.
- 38. The fuel processing system of claim 37, wherein the separation region includes at least one hydrogen-selective membrane and further wherein the hydrogen-rich stream is formed from the portion of the mixed gas stream that passes through the membrane.
- 39. The fuel processing system of claim 37, wherein the separation region is adapted to produce the hydrogen-rich stream via a pressure swing adsorption process.
- 40. The fuel processing system of claim 1 >in combination with a fuel cell stack adapted to receive at least a portion of the mixed gas stream and to produce an electric current therefrom.
- 41. A fuel processing system, comprising:
a fuel processor adapted to receive a feed stream containing at least one feedstock and to produce a mixed gas stream containing hydrogen gas therefrom; and a feedstock reservoir having a compartment adapted to store under pressure in a liquid phase a volume of a carbon-containing feedstock; means for pressurizing the reservoir with a pressurized gas stream containing nitrogen-enriched air; means for delivering the feedstock from the reservoir to the fuel processor.
- 42. The fuel processing system of claim 41, wherein the means for pressurizing is adapted to receive an air stream and to produce a stream of nitrogen-enriched air therefrom.
- 43. The fuel processing system of claim 42, wherein the means for pressurizing includes at least one oxygen-selective membrane.
- 44. The fuel processing system of claim 41, wherein the means for pressurizing is adapted to deliver into the compartment a pressurized gas stream having insufficient oxygen for the feedstock in the compartment to be flammable or explosive when stored under pressure in the compartment.
- 45. The fuel processing system of claim 41, wherein the means for delivering is a pumpless means for delivering that is adapted to deliver the feedstock from the reservoir to the fuel processor without utilizing a pump.
- 46. The fuel processing system of claim 41, wherein the fuel processor is adapted to produce the mixed gas stream by steam reforming.
- 47. The fuel processing system of claim 41, wherein the fuel processor is adapted to produce the mixed gas stream by a selected one of partial oxidation, pyrolysis and autothermal reforming.
- 48. The fuel processing system of claim 41, wherein the fuel processor includes a separation region adapted to receive the mixed gas stream and to produce a hydrogen-rich stream therefrom having a greater concentration of hydrogen gas than the mixed gas stream.
- 49. The fuel processing system of claim 48, wherein the separation region includes at least one hydrogen-selective membrane and further wherein the hydrogen-rich stream is formed from the portion of the mixed gas stream that passes through the membrane.
- 50. The fuel processing system of claim 48, wherein the separation region is adapted to produce the hydrogen-rich stream via a pressure swing adsorption process.
- 51. A fuel processing system, comprising:
a fuel processor adapted to receive a feed stream containing at least one feedstock and to produce a mixed gas stream containing hydrogen gas therefrom; a feedstock reservoir having a compartment in which a liquid-phase carbon-containing feedstock is stored under pressure, wherein the compartment further includes a volume of gas that includes at least one of the group of nitrogen-enriched air, an inert gas, and a combustion-inhibiting gas; and a pumpless delivery regulator adapted to regulate the delivery of the feedstock from the reservoir to the fuel processor.
- 52. The fuel processing system of claim 51, wherein the volume of gas contains insufficient oxygen for the feedstock in the compartment to be flammable or explosive in the compartment.
- 53. The fuel processing system of claim 51, wherein the compartment further contains water.
- 54. The fuel processing system of claim 53, wherein the fuel processor is adapted to produce the mixed gas stream by steam reforming.
- 55. The fuel processing system of claim 51, wherein the reservoir is a first reservoir, wherein the system further comprises a second feedstock reservoir having a compartment in which a liquid-phase feedstock is stored under pressure, wherein the compartment of the second reservoir further includes a volume of gas that includes at least one of the group consisting of nitrogen-enriched air, an inert gas, and a combustion-inhibiting gas.
- 56. The fuel processing system of claim 55, wherein the first and the second reservoirs are interconnected by a gas conduit through which the volume of gas may flow.
- 57. The fuel processing system of claim 55, wherein the liquid-phase feedstock in the second reservoir includes water.
RELATED APPLICATIONS
[0001] The present application claims priority to similarly entitled U.S. Provisional Patent Applications Serial Nos. 60/362,237 and 60/400,901, which were respectively filed on Mar. 5, 2002 and Aug. 1, 2002, and the complete disclosures of which are hereby incorporated by reference for all purposes.
Provisional Applications (2)
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Number |
Date |
Country |
|
60362237 |
Mar 2002 |
US |
|
60400901 |
Aug 2002 |
US |