ultrasuperciritical steam corrosion

oldli31

ultrasuperciritical steam corrosion

pengguoda

Efficiency increases in fossil energy boilers and steam turbines are being achieved by increasing the
% [' C+ R8 p  H, \temperature and pressure at the turbine inlets well beyond the critical point of water. To allow these
  i4 s5 F, S# X" l$ ~2 c& o9 W$ xincreases, advanced materials are needed that are able to withstand the higher temperatures and
pressures in terms of strength, creep, and oxidation resistance. As part of a larger collaborative effort,
5 ^1 u" {* J0 t+ vthe Albany Research Center (ARC) is examining the steam-side oxidation behavior for ultrasupercritical
) G3 f/ v* z5 x( ~+ @(USC) steam turbine applications. Initial tests are being done on six alloys identified as
+ l/ X8 Z7 r* o, m  R' tcandidates for USC steam boiler applications: ferritic alloy SAVE12, austenitic alloy Super 304H, the
high Cr-high Ni alloy HR6W, and the nickel-base superalloys Inconel 617, Haynes 230, and Inconel
740. Each of these alloys has very high strength for its alloy type. Three types of experiments are
7 G& j. s- ~! G/ z! eplanned: cyclic oxidation in air plus steam at atmospheric pressure, thermogravimetric analysis (TGA)
% _' c3 ?+ G# Z" J# F' Kin steam at atmospheric pressure, and exposure tests in supercritical steam up to 650ºC (1202°F) and
: h: E+ L% d- F- d* `34.5 MPa (5000 psi). The atmospheric pressure tests, combined with supercritical exposures at 13.8,
" _9 k' y& i# n$ \+ t& D20.7, 24.6, and 34.5 MPa (2000, 3000, 4000, and 5000 psi) should allow the determination of the effect
# u5 a0 [& a2 j( s% h7 u( {of pressure on the oxidation process.