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发表于 2008-2-11 14:19:15
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来自： 中国江西南昌
Efficiency increases in fossil energy boilers and steam turbines are being achieved by increasing the
& |1 n' T8 Z4 Y7 U. B5 Htemperature and pressure at the turbine inlets well beyond the critical point of water. To allow these; [: a" \0 r: J% r3 m
increases, advanced materials are needed that are able to withstand the higher temperatures and
7 H* V) j @- ^; i2 p5 Hpressures in terms of strength, creep, and oxidation resistance. As part of a larger collaborative effort," W& \; m# b: O- x" l
the Albany Research Center (ARC) is examining the steam-side oxidation behavior for ultrasupercritical! d- \( T7 |8 t/ [1 F( w7 o
(USC) steam turbine applications. Initial tests are being done on six alloys identified as
+ J7 _8 u% v3 K, Vcandidates for USC steam boiler applications: ferritic alloy SAVE12, austenitic alloy Super 304H, the, i% N2 |: i S8 s9 U- l6 l2 h
high Cr-high Ni alloy HR6W, and the nickel-base superalloys Inconel 617, Haynes 230, and Inconel
$ _8 g& _* N9 l9 P3 W7 p% [3 ~740. Each of these alloys has very high strength for its alloy type. Three types of experiments are
1 S& D f% y# b8 M/ [planned: cyclic oxidation in air plus steam at atmospheric pressure, thermogravimetric analysis (TGA)
* h$ r. }: _$ }/ `in steam at atmospheric pressure, and exposure tests in supercritical steam up to 650ºC (1202°F) and
- J8 b( r5 m8 J% L0 I34.5 MPa (5000 psi). The atmospheric pressure tests, combined with supercritical exposures at 13.8,
: Q; m" `4 h- Y1 f3 F20.7, 24.6, and 34.5 MPa (2000, 3000, 4000, and 5000 psi) should allow the determination of the effect
7 w; n& z' k0 P" lof pressure on the oxidation process. |
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