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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 the8 q6 M8 w1 {# P5 N
temperature and pressure at the turbine inlets well beyond the critical point of water. To allow these
; p0 {$ r& w4 }4 V# J" h- wincreases, advanced materials are needed that are able to withstand the higher temperatures and
) |. D0 V. l c( [ r+ tpressures in terms of strength, creep, and oxidation resistance. As part of a larger collaborative effort,
- l- q( e$ [" a) l: Y: {0 o! ~the Albany Research Center (ARC) is examining the steam-side oxidation behavior for ultrasupercritical9 N: S- N6 z. j$ g2 D( Z- H( B4 q
(USC) steam turbine applications. Initial tests are being done on six alloys identified as
2 K* [/ i4 S2 m+ u _4 ycandidates for USC steam boiler applications: ferritic alloy SAVE12, austenitic alloy Super 304H, the
: T- I; ~$ H M+ F( v- T! z& Whigh Cr-high Ni alloy HR6W, and the nickel-base superalloys Inconel 617, Haynes 230, and Inconel3 A8 n4 _5 u1 a9 C5 a2 D& x& {
740. Each of these alloys has very high strength for its alloy type. Three types of experiments are* `" P$ j9 B2 h6 S' U/ U. E
planned: cyclic oxidation in air plus steam at atmospheric pressure, thermogravimetric analysis (TGA)
3 M" @. g! O0 f; ?! I) S- f* q1 Min steam at atmospheric pressure, and exposure tests in supercritical steam up to 650ºC (1202°F) and' G3 x) K2 r& [. Y( u# g A0 S
34.5 MPa (5000 psi). The atmospheric pressure tests, combined with supercritical exposures at 13.8,
# ?* `8 c. v0 b5 R) X! `+ J1 F* ~20.7, 24.6, and 34.5 MPa (2000, 3000, 4000, and 5000 psi) should allow the determination of the effect
% h3 |% Q# y+ @! t; B, Nof pressure on the oxidation process. |
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