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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
* \& Z, [7 f/ m$ e1 gtemperature and pressure at the turbine inlets well beyond the critical point of water. To allow these# w8 k2 m/ ~1 D, J& I
increases, advanced materials are needed that are able to withstand the higher temperatures and/ E6 {1 E! F4 n" c6 v! L1 s
pressures in terms of strength, creep, and oxidation resistance. As part of a larger collaborative effort,
5 N& s4 \" ?( Y- {, W, Hthe Albany Research Center (ARC) is examining the steam-side oxidation behavior for ultrasupercritical. t1 j# O7 L" l/ y# K# |
(USC) steam turbine applications. Initial tests are being done on six alloys identified as# b2 ^$ A! b7 m4 r; P
candidates for USC steam boiler applications: ferritic alloy SAVE12, austenitic alloy Super 304H, the
- [0 x! Z" k4 S1 U xhigh Cr-high Ni alloy HR6W, and the nickel-base superalloys Inconel 617, Haynes 230, and Inconel/ c1 u M# _* ?# W0 r
740. Each of these alloys has very high strength for its alloy type. Three types of experiments are9 s9 Q' L: k5 c8 _3 Y
planned: cyclic oxidation in air plus steam at atmospheric pressure, thermogravimetric analysis (TGA)# h# T" }: Z9 Z3 R7 }3 i
in steam at atmospheric pressure, and exposure tests in supercritical steam up to 650ºC (1202°F) and
* Q6 `* V! J5 C1 z& m34.5 MPa (5000 psi). The atmospheric pressure tests, combined with supercritical exposures at 13.8,! L+ g6 I0 x# z1 W$ E$ C, O1 C
20.7, 24.6, and 34.5 MPa (2000, 3000, 4000, and 5000 psi) should allow the determination of the effect# }* M5 l& b6 Z3 [/ W
of pressure on the oxidation process. |
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