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A system and method for preventing damage to a fuel cell stack resulting from impurities in a hydrogen stream delivered thereto. In some embodiments, the hydrogen stream is a product hydrogen stream from a fuel processor. In some embodiments, the impurities may result from a failure or malfunction i

A system and method for preventing damage to a fuel cell stack resulting from impurities in a hydrogen stream delivered thereto. In some embodiments, the hydrogen stream is a product hydrogen stream from a fuel processor. In some embodiments, the impurities may result from a failure or malfunction in a separation region adapted to remove impurities in the hydrogen stream. The system and method include detecting the concentration of at least one component of the hydrogen stream and isolating the fuel cell stack should this concentration exceed an acceptable threshold level. In some embodiments, the system or method are adapted to detect the concentration of a component that itself is not harmful to the fuel cell stack, or which is not harmful in an associated threshold concentration. In some embodiments, the detected composition is at least one of water, methane, and carbon dioxide.

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We claim: 1. A method for preventing damage to a fuel cell stack in a fuel cell system comprising a fuel cell stack adapted to receive a hydrogen stream, the method comprising: measuring a concentration of water in a hydrogen stream configured for delivery to a fuel cell stack; comparing the measur

We claim: 1. A method for preventing damage to a fuel cell stack in a fuel cell system comprising a fuel cell stack adapted to receive a hydrogen stream, the method comprising: measuring a concentration of water in a hydrogen stream configured for delivery to a fuel cell stack; comparing the measured concentration of water to a corresponding threshold value; and preventing the delivery of the hydrogen stream to the fuel cell stack if the measured concentration of water exceeds the corresponding threshold value. 2. The method of claim 1, wherein the method further includes automatically preventing delivery of the hydrogen stream to the fuel cell stack if the measured concentration of water exceeds the corresponding threshold value. 3. The method of claim 1, wherein the preventing step includes actuating an isolation valve configured to interrupt the flow of the hydrogen stream to the fuel cell stack if the measured concentration of water exceeds the corresponding threshold value. 4. The method of claim 1, wherein the preventing step includes venting the hydrogen stream if the measured concentration of water exceeds the corresponding threshold value. 5. The method of claim 1, wherein the preventing step includes storing the hydrogen stream if the measured concentration of water exceeds the corresponding threshold value. 6. The method of claim 1, wherein the method further includes producing the hydrogen stream from at least one feedstock. 7. The method of claim 6, wherein the producing step includes producing the hydrogen stream in a fuel processor adapted to produce hydrogen gas from the at least one feedstock. 8. The method of claim 7, wherein the method further includes shutting down the fuel processor if the measured concentration exceeds the corresponding threshold value. 9. The method of claim 1, wherein the method further includes actuating a response system if the measured concentration of water exceeds the corresponding threshold value. 10. The method of claim 9, wherein the response system includes a user-notification device. 11. The method of claim 1, wherein the method further includes limiting a load that may be applied to the fuel cell stack if the measured concentration of water exceeds the corresponding threshold value. 12. The method of claim 1, wherein the corresponding threshold value corresponds to 5000 ppm of water in the hydrogen stream. 13. The method of claim 1, wherein the corresponding threshold value corresponds to 1000 ppm of water in the hydrogen stream. 14. The method of claim 1, wherein the corresponding threshold value corresponds to 300 ppm of water in the hydrogen stream. 15. A method for preventing damage to a fuel cell stack in a fuel cell system comprising a fuel cell stack adapted to receive a hydrogen stream, the method comprising: measuring a concentration of methane in a hydrogen stream configured for delivery to a fuel cell stack; comparing the measured concentration of methane to a corresponding threshold value; and preventing the delivery of the hydrogen stream to the fuel cell stack if the measured concentration of methane exceeds the corresponding threshold value. 16. The method of claim 15, wherein the method further includes automatically preventing delivery of the hydrogen stream to the fuel cell stack if the measured concentration of methane exceeds the corresponding threshold value. 17. The method of claim 15, wherein the preventing step includes actuating an isolation valve configured to interrupt the flow of the hydrogen stream to the fuel cell stack if the measured concentration of methane exceeds the corresponding threshold value. 18. The method of claim 15, wherein the preventing step includes venting the hydrogen stream if the measured concentration of methane exceeds the corresponding threshold value. 19. The method of claim 15, wherein the preventing step includes storing the hydrogen stream if the measured concentration of methane exceeds the corresponding threshold value. 20. The method of claim 15, wherein the method further includes producing the hydrogen stream from at least one feedstock. 21. The method of claim 20, wherein the producing step includes producing the hydrogen stream in a fuel processor adapted to produce hydrogen gas from the at least one feedstock. 22. The method of claim 21, wherein the method further includes shutting down the fuel processor if the measured concentration exceeds the corresponding threshold value. 23. The method of claim 15, wherein the method further includes actuating a response system if the measured concentration of methane exceeds the corresponding threshold value. 24. The method of claim 23, wherein the response system includes a user-notification device. 25. The method of claim 15, wherein the method further includes limiting a load that may be applied to the fuel cell stack if the measured concentration of methane exceeds the corresponding threshold value. 26. The method of claim 15, wherein the corresponding threshold value corresponds to methane comprising 1% of the hydrogen stream. 27. The method of claim 15, wherein the corresponding threshold value corresponds to 1000 ppm of methane in the hydrogen stream. 28. The method of claim 15, wherein the corresponding threshold value corresponds to 300 ppm of methane in the hydrogen stream. 29. A system for preventing damage to a fuel cell stack, the system comprising: a fuel cell stack including at least one fuel cell adapted to receive a hydrogen stream and to utilize the hydrogen stream to produce an electric current; and a control system adapted to prevent delivery of the hydrogen stream to the fuel cell stack if a concentration of at least one selected component of the hydrogen stream exceeds one or more corresponding threshold values, and further wherein the at least one selected component includes at least one of methane and water. 30. The system of claim 29, wherein the system further includes a fuel processing assembly adapted to produce the hydrogen stream. 31. The system of claim 30, wherein the fuel processing assembly includes at least one hydrogen-producing region that contains a reforming catalyst. 32. The system of claim 29, wherein the system further includes a separation assembly adapted to remove contaminants from the hydrogen stream. 33. The system of claim 29, wherein the at least one selected component, if present in the hydrogen stream in a concentration that is at least as great as the corresponding threshold value, is not harmful to the fuel cell stack. 34. The system of claim 29, wherein the control system includes a sensor assembly adapted to measure the concentration of the at least one selected component of the hydrogen stream and a controller adapted to compare the concentration of the at least one selected component to at least one corresponding threshold value.