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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 the4 @" P% P9 m" G, T* j$ O! v
temperature and pressure at the turbine inlets well beyond the critical point of water. To allow these. Q9 N9 k- m# J" Z6 \
increases, advanced materials are needed that are able to withstand the higher temperatures and
! y; x6 a! j1 [) Cpressures in terms of strength, creep, and oxidation resistance. As part of a larger collaborative effort,* Z+ c- X7 p; V
the Albany Research Center (ARC) is examining the steam-side oxidation behavior for ultrasupercritical' q; W$ k8 R2 _' V* F" w
(USC) steam turbine applications. Initial tests are being done on six alloys identified as
% V) X. M9 l/ P0 @6 ^( Ecandidates for USC steam boiler applications: ferritic alloy SAVE12, austenitic alloy Super 304H, the' O3 `) a. s- g5 Q( H; Z
high Cr-high Ni alloy HR6W, and the nickel-base superalloys Inconel 617, Haynes 230, and Inconel
2 I# e# N8 [' C740. Each of these alloys has very high strength for its alloy type. Three types of experiments are
3 s3 U8 j1 z0 Splanned: cyclic oxidation in air plus steam at atmospheric pressure, thermogravimetric analysis (TGA)
! m. K7 h& Q4 Y1 A5 Zin steam at atmospheric pressure, and exposure tests in supercritical steam up to 650ºC (1202°F) and6 ?& W9 J+ W; a$ m
34.5 MPa (5000 psi). The atmospheric pressure tests, combined with supercritical exposures at 13.8,
! ~% w, q+ P% n, |9 x7 C% F1 k20.7, 24.6, and 34.5 MPa (2000, 3000, 4000, and 5000 psi) should allow the determination of the effect
$ S$ y$ i- o4 [1 aof pressure on the oxidation process. |
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