The objective of the paper was to recognize the possible effect of a low concentration of chemical impurity (NaCl) present in the inlet steam (2.27 ppb) in the assessment of the wet steam energy loss occurring in a 1000 MW nuclear low pressure steam turbine. The presented analysis suggests that the used binary nucleation model, accounting for the electrolytic nature of the droplets, predicts a reduced wet steam energy loss of order –9 %, in comparison with the unary pure steam droplet nucleation model. This minor difference, considering the uncertainties of the existing measurements and the incomplete knowledge of the real droplet nucleation conditions in the steam of the turbine (primarily in relation to the necessary input data of chemical impurities), suggests that unary pure steam droplet nucleation (Becker–Döring) is an acceptable approximation at the current state of knowledge.
Bakhtar F (guest ed.). Special issue on wet steam, Part 1. Proc IMechE, Part C: J Mechanical Engineering Science 2004; C8: 218.
2.
Bakhtar F (guest ed.). Special issue on wet steam, Part 2. Proc IMechE, Part C: J Mechanical Engineering Science 2005; C12: 219.
3.
BaumannK. Some recent developments in large steam turbine practice. J Inst Electr Eng1921; 59: 565–623.
4.
Miller EH and Schofield P. The performance of large steam turbines with water reactors. In: ASME Winter annual meeting, Schenectady, NY: General Electric, 26–30 November 1972.
5.
MooreMJGas dynamics of wet steam and energy losses in wet-steam turbines. In: MooreMJSieverdingCH (eds). Two-phase steam flow in turbines and separators, Washington, DC: Hemisphere, 1976, pp. 59–126.
6.
DeichMEFilippovGA. Fluid dynamics of two-phase flows (in Russian), Moscow: Energoizdat, 1968 (second edition 1981).
7.
Kreitmeier F, Greim R, Congin F, et al. Experimental and numerical analysis of relaxation processes in LP steam turbines. Proc IMechE, Part C: J Mechanical Engineering Science, Special Issue on Wet Steam Part 2, 2005; C12: 1411–1436.
8.
Petr V and Kolovratnik M. Classical nucleation theory as an adequate model in predicting related wet steam effects in LP steam turbines. In: 9th European conference on turbomachinery, fluid dynamics and thermodynamics, Istanbul, Turkey: Istanbul Technical University, 21--25 March 2011, pp.991–1003.
9.
Petr V and Kolovratnik M. Wet steam energy loss and related Baumann rule in a 1000 MW nuclear and 210 MW fossil-fired LP steam turbine. In: Young J and White A (eds) Proceedings of the Baumann centenary conference on: The science and engineering of non-equilibrium wet steam flows in steam turbines, Cambridge, UK: Cambridge University Engineering Department, 10–11 September 2012, 15pp.
10.
NemecTMarsikF. Binary nucleation of water and sodium chloride. J Chem Phys2006; 124: 044509–044509.
11.
Nemec T. Homogeneous nucleation in selected aqueous systems. PhD Thesis, Czech Technical University in Prague, Prague, 2006.
12.
Bakhtar F, Young JB, White AJ, et al. Classical nucleation theory and its application to condensing steam flow calculations. Proc IMechE, Part C: J Mechanical Engineering Science, Special Issue on Wet Steam – Part 2 2005; C12: 1315–1333.
13.
YoungJB. The spontaneous condensation of steam in supersonic nozzles. Physicochem Hydrodyn1982; 3: 57–82.
14.
Petr V and Kolovratnik M. Diagnostics of wet steam in LP steam turbines. In: 5th European conference on turbomachinery, fluid dynamics and thermodynamics, Prague, Czech Republic: Association of Czech Mechanical Engineers, 17--22 March 2003, pp.687–698.
15.
PetrVKolovratnikMHanzalV. Instrumentation and tests on droplets nucleation in LP steam turbines. Power Plant Chem2003; 5: 389–395.
16.
Walters PT. Optical measurement of water droplets in wet steam. In: IMechE conference: Heat and fluid flow in steam and gas turbine plant, University of Warwick, Coventry, UK: MEP London, 3--5 April 1973, pp.66–74.
17.
MooreMJEderhofAInstrumentation for wet steam. In: MooreMJSieverdingCH (eds). Two-phase steam flow in turbines and separators, Washington, DC: Hemisphere, 1976, pp. 191–260.
18.
Gyarmathy G. Grundlagen einer Theorie der Nassdampfturbine. PhD Thesis, ETH Zürich, Juris, Zürich, 1962.
19.
YauKKYoungJB. The deposition of fog droplets on steam turbine blades by turbulent diffusion. Trans ASME J Turbomach1987; 109: 429–435.
20.
Laali AR. A new approach for assessment of the wetness losses in steam turbines. In: IMechE conference: Turbomachinery – latest developments in a changing scene, Birdcage Walk, London: Bury St. Edmund [England]: Published for IMechE by Mechanical Engineering Publications, 19--20 March 1991, pp.155–166.
21.
Petr V. A survey of relaxation losses in a turbine blading operating in wet steam. In: Proceedings of the institution of mechanical engineers conference on turbomachinery, efficiency prediction and improvement, Robinson College, Cambridge, UK: MEP London, 1–3 September 1987, paper no. C265/87, pp.113–123.
22.
Bakhtar F and Heaton AV. An examination of the effect of wake chopping on droplet sizes in steam turbines. In: B.N.E.S. conference on technology of turbine plant operating with wet steam. London: Institution of Mechanical Engineers, 1988, pp.197–200.
23.
Bakhtar F and Heaton AV. Effects of wake chopping on droplet sizes in steam turbines. Proc IMechE, Part C: J Mechanical Engineering Science, Special Issue on Wet Steam Part 2 2005; C12: 1357–1367.
24.
PetrVKolovratnikM. Modelling of the droplet size distribution in LP steam turbine. Proc IMechE, Part A: J Power and Energy2000; 214: 145–152.
