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Abstract

The approach used in this paper for the condensation of flowing steam is based on the binary nucleation of water and a representative chemical impurity NaCl. The physical and mathematical models are briefly described. The binary nucleation numerical model is tested on steam flow with condensation in a Laval nozzle with a low expansion rate of about 1000 s⁻¹ in the divergent part of the nozzle. The calculated results for the pressure distribution are compared with experiments. The binary nucleation numerical model is then used for the calculation of steam flow with condensation in the two-dimensional nozzle-blade cascade of the first wet stage of the low-pressure part of a condensing 200 MW steam turbine. Calculations of the flow in the cascade at high and low expansion rates are presented.

Keywords

Steam flow turbine cascade condensation chemical impurity

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References

Dibelius GH, Mertens K, Pitt RU, et al. Investigation of wet steam flow in turbines. In: Proceedings of the institution of mechanical engineers conference on turbomachinery – Efficiency prediction and improvement, Paper C271/87, IMechE, London, 1987, pp.135–143.

Bohn D, Kerpicci H, Ren J, et al. Homogeneous and heterogeneous nucleation in a nozzle guide vane of a LP steam turbine. In: Proceedings of 4th European conference on turbomachinery - Fluid dynamics and thermodynamics, Firenze, Italy, 2001, pp.813–822.

Gyarmathy

Meyer

. Spontane kondensation, VDI Forschungsheft 508, Dusseldorf: VDI-Verlag, 1965.

Bellows

. Chemical processes in steam turbines. Power Plant Chemistry 1999; 1: 26–30.

Becker

Doering

. Kinetische Behandlung der Keimbildung in uebersaettingten Daempfen. Annalen der Physik 1935; 24(8): 719–752.

Lankaš F. Thermodynamical description of condensation waves. Doctoral Thesis, Czech Academy of Sciences, Institute of Thermomechanics, Prague, Czech, 1997.

Gorbunov

Hamilton

. Water nucleation on aerosol particles containing both soluble and insoluble substances. J Aerosol Sci 1997; 28: 239–248.

Gyarmathy

. Zur Wachstumgeschwindigkeit kleiner Fluessigkeitstropfen in einer uebersaettigten Atmosphaere. ZAMP 1963; 14: 280–293.

Petr V and Kolovratník M. Steam, chemistry, and corrosion in the phase transition zone of steam turbines. Key results, summary and interpretation. Corporate Report, EPRI, TR-108184-V1, 1999.

Condensation of steam with chemical impurity in a turbine cascade

Abstract

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References