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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! M6 `& [; l* M
temperature and pressure at the turbine inlets well beyond the critical point of water. To allow these
* o" k' T7 E' g3 w0 _0 lincreases, advanced materials are needed that are able to withstand the higher temperatures and' A( \( c; B5 M, Z! S
pressures in terms of strength, creep, and oxidation resistance. As part of a larger collaborative effort,
* U# ^6 \0 J$ l, ?( ^the Albany Research Center (ARC) is examining the steam-side oxidation behavior for ultrasupercritical) Q- ]! W( B- O: n7 Q1 S4 Q1 j3 R
(USC) steam turbine applications. Initial tests are being done on six alloys identified as+ c) s' ?0 J9 P- ^
candidates for USC steam boiler applications: ferritic alloy SAVE12, austenitic alloy Super 304H, the7 W" K0 ^. F. V- ?- Q! n! c/ r0 M
high Cr-high Ni alloy HR6W, and the nickel-base superalloys Inconel 617, Haynes 230, and Inconel
& }, _: J4 L' `7 f B* k4 Y740. Each of these alloys has very high strength for its alloy type. Three types of experiments are3 N3 U" M8 P; u& }
planned: cyclic oxidation in air plus steam at atmospheric pressure, thermogravimetric analysis (TGA)! v* V6 L% G" W2 J0 [$ M
in steam at atmospheric pressure, and exposure tests in supercritical steam up to 650ºC (1202°F) and D& I4 [* u% S; P' n6 I( M* n
34.5 MPa (5000 psi). The atmospheric pressure tests, combined with supercritical exposures at 13.8,
/ L ?5 y; a5 C# y0 I20.7, 24.6, and 34.5 MPa (2000, 3000, 4000, and 5000 psi) should allow the determination of the effect
5 u& c, R$ H) |/ j8 ~5 O/ p; Fof pressure on the oxidation process. |
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