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FIGURE 5. Turbine axial section for the Allam cycle on super-critical carbon dioxide (the second version) CONCLUSION 1. Based on the Allam cycle analysis the technical specification for the supercritical carbon dioxide gas turbine is formed. The existing experience in steam and gas turbine design was used for its development due to the relatively high initial temperature and pressure. Two versions of the supercritical carbon dioxide gas turbine of 400 MW are designed for the Allam cycle operating at an initial temperature of 1150 °C, an initial pressure of 300 bar with a back pressure of 30 bar. The flowpath of the turbines is of a loop scheme, which remarkably reduces the thrust bearing axial load and also reduces the size of the internal housing made of nickel alloy. To reduce the axial length of the turbine the number of stages has been decreased to 9 by the root diameter linear increase from 0.9 m in the first stage to 1.2 m in the last one. The turbine design internal specific efficiency is 85.7%. 2. The blade height of the first stage blades is 45 mm, which is relatively low due to the high density of the supercritical carbon dioxide leading to the low specific volume. To decrease the high value of the endwall losses it is possible to install the small longitude ribs at the endwall surfaces of the blade rows. The ribs height should be comparable with the boundary layer thickness to prevent big vortexes. ACKNOWLEDGEMENTS This study conducted by National Research University "Moscow Power Engineering Institute" was supported by the Russian Science Foundation under Agreement No. 17-79-20371 dated July 28, 2017. REFERENCES 1. R. J. Allam, M. R. Palmer and G.W. Brown, (2013). U.S. Patent No. 8,596,075 (26 February 2009). 2. Allam, R. J., Palmer, M. R., Brown Jr, G. W., J. Fetvedt, D. Freed, H. Nomoto, ... and Jr C. Jones, High efficiency and low cost of electricity generation from fossil fuels while eliminating atmospheric emissions, including carbon dioxide, ENERGY PROCEED, Letters 37, 1135-1149 (2013). 3. J. M. Klara and J. E. Plunkett, The potential of advanced technologies to reduce carbon capture costs in future IGCC power plants, International Journal of Greenhouse Gas Control, Letters 4(2), 112-118 (2010). 4. A. E. Zaryankin, Mechanics of non-compressible and compressible fluids (MPEI Publishing house, Moscow, 2014), pp.1-590. 5. A. E. Zaryankin, N. D. Rogalev, A. N. Rogalev, I. V. Garanin, S. K. Osipov and E. Y. Grigoriev, Control valves and cascades for the first stages of turbines with ultra-supercritical steam parameters, THERM ENG, Letters 63(6), 422-429 (2016). 6. M. Y. Deitch, L. Y. Lazarev, G. A. Filippov, Steam turbine atlas. 7. A. D. Trukhny, M. A. Izyumov, O. A. Povarov, S. P. Malyshenko, Modern power industry topics, vol. 1. Modern thermal power industry (MPEI Publishing house, Moscow, 208), pp. 1-317. 020026-6PDF Image | Supercritical CO2 gas turbines for high-power generation
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