TUBULAR RADIATION ABSORBING DEVICE FOR A SOLAR POWER PLANT WITH REDUCED HEAT LOSSES
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United States of America Patent
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app pub date -
Nov 21, 2006
filing date -
Nov 25, 2005
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Abandoned
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Abstract
The tubular radiation absorbing device (1) for solar thermal applications includes a central tube (3) made of chromium steel, particularly stainless steel; a glass tubular jacket (2) surrounding the central tube so as to form a ring-shaped space (6); and a barrier coating (4) on at least an interior side of the central tube (3), which is substantially impermeable to hydrogen and contains chromium oxide. The barrier coating (4) is provided by a process in which the central tube (3) is treated with steam containing free hydrogen at a temperature of 500.degree. C. to 700.degree. C.
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