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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
* C1 ~- n1 O& E0 E! q0 \* P! ytemperature and pressure at the turbine inlets well beyond the critical point of water. To allow these
7 _ A& Y4 @6 N6 T B: B1 A% Gincreases, advanced materials are needed that are able to withstand the higher temperatures and
$ i c4 L% G T5 E7 dpressures in terms of strength, creep, and oxidation resistance. As part of a larger collaborative effort,
. p ~# T2 g3 v) E& _the Albany Research Center (ARC) is examining the steam-side oxidation behavior for ultrasupercritical
0 L0 r6 Q1 N1 p5 r& S(USC) steam turbine applications. Initial tests are being done on six alloys identified as
+ g: f; u, i8 v1 J; l; Bcandidates for USC steam boiler applications: ferritic alloy SAVE12, austenitic alloy Super 304H, the
# |! X: D5 O+ l8 v" Nhigh Cr-high Ni alloy HR6W, and the nickel-base superalloys Inconel 617, Haynes 230, and Inconel
( R5 F1 p) X8 A740. Each of these alloys has very high strength for its alloy type. Three types of experiments are4 O( _+ W, w: b
planned: cyclic oxidation in air plus steam at atmospheric pressure, thermogravimetric analysis (TGA)
3 G5 q" P+ r# f* A% O4 Ain steam at atmospheric pressure, and exposure tests in supercritical steam up to 650ºC (1202°F) and
; B, Z/ u2 ?+ F( a34.5 MPa (5000 psi). The atmospheric pressure tests, combined with supercritical exposures at 13.8,0 E' @/ r1 `3 `: Q+ Y( b. |, ?
20.7, 24.6, and 34.5 MPa (2000, 3000, 4000, and 5000 psi) should allow the determination of the effect4 C) W1 W+ h* ^( A1 a
of pressure on the oxidation process. |
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