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4-13. SEM photographs of each section of the tube sample after 500 hours of exposure. Samples were taken from the a) 0-25 mm, b)25-50 mm and c) 50-75 mm sections of the tube................................................................................................................................................. 68 4-14. (BSE) Corrosion (dark) in the 50-75 mm length (i.e. the pipe center) showing EDS analysis locations. .......................................................................................................................... 69 4-15. Elemental analysis by EDS showing the corrosion product at the outermost #2 location (Figure 4-14 in blue circle) is almost exclusively chromium oxide. (The unidentified peaks are from a conductive gold coating applied after exposure.) ............................................... 70 4-16. The intrusion of corrosion into the base metal, a), may be due to corrosion along the grain boundaries of the fine grain material near the inner surface of the sample, b). ............................. 70 4-17. Cross section through samples, a) I-617 and b) MA 754, exposed to supercritical CO2 at 1000oC for 175 hours. I-617 shows intergranular attack which is absent from the MA 754 sample. ........................................................................................................................................... 73 4-18. The corrosion product at spot 1 (blue circle in a)) that forms on I-617 in supercritical CO2 at 1000oC is composed mainly of chromium oxide as shown by the EDS spectra in b). (The unidentified peaks are from a conductive gold coating applied after exposure.) ............. 74 TABLES 2-1. Temperature and pressure comparisons from the reference design, ASPEN PLUS and HYSIS models. ................................................................................................................................. 10 2-2. Temperature and pressure comparisons from the reference design, ASPEN PLUS and HYSYS models. ............................................................................................................................... 12 2-3. Comparisons of one-shaft vs. multiple-shafts. ................................................................................. 17 3-1. Parametric study as a function of the turbine inlet temperature. ...................................................... 19 3-2. Comparison between HYSIS simulation and Visual-Basic based model......................................... 22 3-3. Cycle efficiency sensitivity to key cycle parameters........................................................................ 27 3-4. Results of the pressure effect on the efficiency. ............................................................................... 30 3-5. Comparison of cycles for different working fluids........................................................................... 33 3-6. Cycle conditions used for intercoolers ............................................................................................. 34 3-7. Summary of HYSYS simulation with multiple reheats.................................................................... 35 3-8. Cycle conditions used in CO2 split flow cycle ................................................................................. 38 3-9. Comparison of cycle implication due to various cycle layouts and intermediate cooling................ 39 xivPDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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