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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
# q1 c8 L$ R, ?) Atemperature and pressure at the turbine inlets well beyond the critical point of water. To allow these
+ ?$ p: Z ^. L$ Q4 e- ~/ e: a% {increases, advanced materials are needed that are able to withstand the higher temperatures and
! y C u4 J5 f* V bpressures in terms of strength, creep, and oxidation resistance. As part of a larger collaborative effort,5 e3 V6 m$ W/ O* y. F" K6 r
the Albany Research Center (ARC) is examining the steam-side oxidation behavior for ultrasupercritical! z" i- J8 R5 I& C+ ^
(USC) steam turbine applications. Initial tests are being done on six alloys identified as5 i* |9 x4 y9 `$ m
candidates for USC steam boiler applications: ferritic alloy SAVE12, austenitic alloy Super 304H, the0 K; [. g4 m% c8 t7 F/ @7 A. l4 j
high Cr-high Ni alloy HR6W, and the nickel-base superalloys Inconel 617, Haynes 230, and Inconel: W, R/ k& Q; f* [+ [" n9 o0 S
740. Each of these alloys has very high strength for its alloy type. Three types of experiments are# k$ B; p8 U9 J: i7 N
planned: cyclic oxidation in air plus steam at atmospheric pressure, thermogravimetric analysis (TGA)6 X7 r0 S: Y( b/ T" M
in steam at atmospheric pressure, and exposure tests in supercritical steam up to 650ºC (1202°F) and6 ~( _# B) U* Z- {
34.5 MPa (5000 psi). The atmospheric pressure tests, combined with supercritical exposures at 13.8,
7 D% C8 f; e- ^) g' f, z3 Q+ H20.7, 24.6, and 34.5 MPa (2000, 3000, 4000, and 5000 psi) should allow the determination of the effect
0 P S& m: h: z0 D; e# Vof pressure on the oxidation process. |
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