| Description |
1 online resource (8 p.) : ill. |
| Series |
NREL/CP ; 5500-43966 |
|
Conference paper (National Renewable Energy Laboratory (U.S.)) ; NREL/CP-5500-43966.
|
| System Details |
Full text available via Internet in .pdf format. Adobe Acrobat Reader required. |
| Note |
Title from title screen (NREL, viewed Nov. 1, 2010). |
|
"October 2010." |
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"Presented at SolarPACES 2010, Perpignan, France, September 21-24, 2010." |
| Summary |
Essentially all of the currently operating commercial parabolic trough power plants use a heat-transfer fluid (HTF) that is a eutectic mixture of two organic compounds, biphenyl and diphenyl oxide. At elevated temperatures up to 393 degrees C, the organic components undergo very slow degradation reactions that produce hydrogen as a byproduct. Hydrogen within the annular volumes of the receivers may result in substantial degradation of the thermal performance of the receivers. This work is investigating methods to eliminate hydrogen from the receivers of a parabolic trough power plant by removing it from a central location within the plant. A mathematical model was developed that tracks the generation and transport of hydrogen within an operating plant. Modeling results predicted the steady-state partial pressure of hydrogen within the receiver annuli to be ~1 torr. This result agrees with measured values for the hydrogen partial pressure. The model also predicted the rate at which hydrogen must be actively removed from the expansion tank to reduce the partial pressure of hydrogen within the receiver annuli to less than 0.001 torr. Based on these results, mitigation strategies implemented at operating parabolic trough power plants can reduce hydrogen partial pressure to acceptable levels. Transient modeling predicted the time required to reduce the hydrogen partial pressures within receiver annuli to acceptable levels. The times were estimated as a function of bellows temperature, getter quantity, and getter temperature. This work also includes an experimental effort that will determine the time required to purge hydrogen from a receiver annulus with no getter. |
| Bibliography |
Includes bibliographical references. |
| Funding |
DE-AC36-08GO28308. CP09.1101 |
| Subject |
Parabolic troughs -- Research -- Congresses.
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Hydrogen -- Congresses.
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Getters -- Congresses.
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Gases -- Absorption and adsorption -- Congresses.
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| Added Author |
National Renewable Energy Laboratory (U.S.)
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SolarPACES (Conference)
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| Gpo Item No. |
0430-P-04 (online) |
| Sudoc No. |
E 9.17:NREL/CP-5500-43966 |
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